Re: [Lift] Is this a bug?
Dear David,
Thanks!
So, what's the recommended way of building a headless RESTful webservice
that takes parameters?
Best wishes,
--greg
On Mon, Feb 15, 2010 at 1:26 PM, David Pollak feeder.of.the.be...@gmail.com
wrote:
On Mon, Feb 15, 2010 at 1:23 PM, Meredith Gregory
lgreg.mered...@gmail.com wrote:
Dear Lifted,
Here are some steps to create the observed behavior.
- Create an instance of the lift basic archetype
put the following script into mklift.sh
#! /bin/sh
mvn archetype:generate -U \
-DarchetypeGroupId=net.liftweb \
-DarchetypeArtifactId=lift-archetype-basic \
-DarchetypeVersion=2.0-scala280-SNAPSHOT \
-DarchetypeRepository=http://scala-tools.org/repo-snapshots \
-DremoteRepositories=http://scala-tools.org/repo-releases \
-DgroupId=$1 -DartifactId=$2
mklift.sh org.my.lift thingy
- Modify Boot.scala by adding the following code to the Boot class
def dispatch: LiftRules.DispatchPF = {
case req @ Req(
List(
biosimilarity-services,
grammar,
grammar
), , GetRequest) = {
println( * What is going on HERE * )
() = Full(
PlainTextResponse(
grammar + \n,
List( Content-Type - text/plain; charset=UTF-8 ),
200
)
)
}
}
LiftRules.dispatch.prepend(dispatch)
- Start up lift
mvn clean compile jetty:run
- Call curl
curl -o test.txt
http://localhost:8080/biosimilarity-services/grammar/banana-cream-pie#file=file://
pathToFile
i expected to find text.txt containing:
banana-cream-pie#file=file://pathToFile
However, it contains banana-cream-pie. This means that the fragment is
being dropped. How do i get the fragment?
You don't. According to the HTTP spec, the stuff that comes after the # is
not passed to the server (you can verify this with Wireshark). The # and
what comes after it is client side only.
Best wishes,
--greg
--
L.G. Meredith
Managing Partner
Biosimilarity LLC
1219 NW 83rd St
Seattle, WA 98117
+1 206.650.3740
http://biosimilarity.blogspot.com
--
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--
Lift, the simply functional web framework http://liftweb.net
Beginning Scala http://www.apress.com/book/view/1430219890
Follow me: http://twitter.com/dpp
Surf the harmonics
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--
L.G. Meredith
Managing Partner
Biosimilarity LLC
1219 NW 83rd St
Seattle, WA 98117
+1 206.650.3740
http://biosimilarity.blogspot.com
--
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Re: [Lift] Is this a bug?
P.S. By headless, i mean no browser involved...
On Mon, Feb 15, 2010 at 1:34 PM, Meredith Gregory
lgreg.mered...@gmail.comwrote:
Dear David,
Thanks!
So, what's the recommended way of building a headless RESTful webservice
that takes parameters?
Best wishes,
--greg
On Mon, Feb 15, 2010 at 1:26 PM, David Pollak
feeder.of.the.be...@gmail.com wrote:
On Mon, Feb 15, 2010 at 1:23 PM, Meredith Gregory
lgreg.mered...@gmail.com wrote:
Dear Lifted,
Here are some steps to create the observed behavior.
- Create an instance of the lift basic archetype
put the following script into mklift.sh
#! /bin/sh
mvn archetype:generate -U \
-DarchetypeGroupId=net.liftweb \
-DarchetypeArtifactId=lift-archetype-basic \
-DarchetypeVersion=2.0-scala280-SNAPSHOT \
-DarchetypeRepository=http://scala-tools.org/repo-snapshots \
-DremoteRepositories=http://scala-tools.org/repo-releases \
-DgroupId=$1 -DartifactId=$2
mklift.sh org.my.lift thingy
- Modify Boot.scala by adding the following code to the Boot class
def dispatch: LiftRules.DispatchPF = {
case req @ Req(
List(
biosimilarity-services,
grammar,
grammar
), , GetRequest) = {
println( * What is going on HERE * )
() = Full(
PlainTextResponse(
grammar + \n,
List( Content-Type - text/plain; charset=UTF-8 ),
200
)
)
}
}
LiftRules.dispatch.prepend(dispatch)
- Start up lift
mvn clean compile jetty:run
- Call curl
curl -o test.txt
http://localhost:8080/biosimilarity-services/grammar/banana-cream-pie#file=file://
pathToFile
i expected to find text.txt containing:
banana-cream-pie#file=file://pathToFile
However, it contains banana-cream-pie. This means that the fragment is
being dropped. How do i get the fragment?
You don't. According to the HTTP spec, the stuff that comes after the #
is not passed to the server (you can verify this with Wireshark). The # and
what comes after it is client side only.
Best wishes,
--greg
--
L.G. Meredith
Managing Partner
Biosimilarity LLC
1219 NW 83rd St
Seattle, WA 98117
+1 206.650.3740
http://biosimilarity.blogspot.com
--
You received this message because you are subscribed to the Google Groups
Lift group.
To post to this group, send email to lift...@googlegroups.com.
To unsubscribe from this group, send email to
liftweb+unsubscr...@googlegroups.comliftweb%2bunsubscr...@googlegroups.com
.
For more options, visit this group at
http://groups.google.com/group/liftweb?hl=en.
--
Lift, the simply functional web framework http://liftweb.net
Beginning Scala http://www.apress.com/book/view/1430219890
Follow me: http://twitter.com/dpp
Surf the harmonics
--
You received this message because you are subscribed to the Google Groups
Lift group.
To post to this group, send email to lift...@googlegroups.com.
To unsubscribe from this group, send email to
liftweb+unsubscr...@googlegroups.comliftweb%2bunsubscr...@googlegroups.com
.
For more options, visit this group at
http://groups.google.com/group/liftweb?hl=en.
--
L.G. Meredith
Managing Partner
Biosimilarity LLC
1219 NW 83rd St
Seattle, WA 98117
+1 206.650.3740
http://biosimilarity.blogspot.com
--
L.G. Meredith
Managing Partner
Biosimilarity LLC
1219 NW 83rd St
Seattle, WA 98117
+1 206.650.3740
http://biosimilarity.blogspot.com
--
You received this message because you are subscribed to the Google Groups
Lift group.
To post to this group, send email to lift...@googlegroups.com.
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liftweb+unsubscr...@googlegroups.com.
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Re: [Lift] Is this a bug?
Dear Jeppe, Thanks! A quick test shows that curl -o test.txt http://localhost:8080/biosimilarity-services/grammar/banana-cream-pie?file=file:// pathToFile also results in test.txt containing banana-cream-pie. As for the latter comment, i'm writing an URL-passing protocol. That is, the service is being told the URL for a resource -- which it will use subsequently. That's still well within RESTful doctrine ;-). Best wishes, --greg On Mon, Feb 15, 2010 at 1:38 PM, Jeppe Nejsum Madsen je...@ingolfs.dkwrote: On Mon, Feb 15, 2010 at 10:34 PM, Meredith Gregory lgreg.mered...@gmail.com wrote: Dear David, Thanks! So, what's the recommended way of building a headless RESTful webservice that takes parameters? You could use normal url parameters: biosimilarity-services/grammar/banana-cream-pie?file=xxfile2=yyfile3=zz But a more idiomatic way is probably to use the uri to represent the resources. But whole Phd dissertations have been written about this :-) /Jeppe -- You received this message because you are subscribed to the Google Groups Lift group. To post to this group, send email to lift...@googlegroups.com. To unsubscribe from this group, send email to liftweb+unsubscr...@googlegroups.comliftweb%2bunsubscr...@googlegroups.com . For more options, visit this group at http://groups.google.com/group/liftweb?hl=en. -- L.G. Meredith Managing Partner Biosimilarity LLC 1219 NW 83rd St Seattle, WA 98117 +1 206.650.3740 http://biosimilarity.blogspot.com -- You received this message because you are subscribed to the Google Groups Lift group. To post to this group, send email to lift...@googlegroups.com. To unsubscribe from this group, send email to liftweb+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/liftweb?hl=en.
Re: [Lift] Is this a bug?
Dear Jeppe, Thanks! i was just sorting through that... ;-) Best wishes, --greg On Mon, Feb 15, 2010 at 2:00 PM, Jeppe Nejsum Madsen je...@ingolfs.dkwrote: On Mon, Feb 15, 2010 at 10:46 PM, Meredith Gregory lgreg.mered...@gmail.com wrote: Dear Jeppe, Thanks! A quick test shows that curl -o test.txt http://localhost:8080/biosimilarity-services/grammar/banana-cream-pie?file=file:// pathToFile also results in test.txt containing banana-cream-pie. As for the latter comment, i'm writing an URL-passing protocol. That is, the service is being told the URL for a resource -- which it will use subsequently. That's still well within RESTful doctrine ;-). Sorry, didn't see your original code :-) The parameters will not be part of the url and thus not put into grammar. You'll have to fetch the parameters manually either by way of S.params or Req.params /Jeppe -- You received this message because you are subscribed to the Google Groups Lift group. To post to this group, send email to lift...@googlegroups.com. To unsubscribe from this group, send email to liftweb+unsubscr...@googlegroups.comliftweb%2bunsubscr...@googlegroups.com . For more options, visit this group at http://groups.google.com/group/liftweb?hl=en. -- L.G. Meredith Managing Partner Biosimilarity LLC 1219 NW 83rd St Seattle, WA 98117 +1 206.650.3740 http://biosimilarity.blogspot.com -- You received this message because you are subscribed to the Google Groups Lift group. To post to this group, send email to lift...@googlegroups.com. To unsubscribe from this group, send email to liftweb+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/liftweb?hl=en.
Re: [Lift] Lift and Scala 2.8 Beta1
Dear Indrajit, Thanks for your diligence on this effort! However, i'm not having a lot of luck. Here's my methodology. - i would like to test using an archetype generated project before i test with my project code -- which is likely to be so stupid and error-ridden as to cause all kinds of problems. i've got a feeling that the archetype i'm getting is out of sync (please see the script i use and the trace it generates). - After generating the project from the archetype i change the lift version as you indicate and the lift jars cannot be resolved. This may have to do with the problem above. Best wishes, --greg - Script #! /bin/sh mvn archetype:generate -U \ -DarchetypeGroupId=net.liftweb \ -DarchetypeArtifactId=lift-archetype-basic \ -DarchetypeVersion=1.0 \ -DremoteRepositories=http://scala-tools.org/repo-releases \ -DgroupId=$1 -DartifactId=$2 - Trace bash-3.2$ bin/mklift.sh com.biosimilarity.identity testLift280 [INFO] Scanning for projects... [INFO] Searching repository for plugin with prefix: 'archetype'. [INFO] org.apache.maven.plugins: checking for updates from central [INFO] org.codehaus.mojo: checking for updates from central [INFO] artifact org.apache.maven.plugins:maven-archetype-plugin: checking for updates from central [INFO] [INFO] Building Maven Default Project [INFO]task-segment: [archetype:generate] (aggregator-style) [INFO] [INFO] Preparing archetype:generate [INFO] No goals needed for project - skipping [INFO] Setting property: classpath.resource.loader.class = 'org.codehaus.plexus.velocity.ContextClassLoaderResourceLoader'. [INFO] Setting property: velocimacro.messages.on = 'false'. [INFO] Setting property: resource.loader = 'classpath'. [INFO] Setting property: resource.manager.logwhenfound = 'false'. [INFO] [archetype:generate] [INFO] Generating project in Interactive mode [INFO] Archetype repository missing. Using the one from [net.liftweb:lift-archetype-basic:RELEASE - http://scala-tools.org/repo-releases] found in catalog internal Downloading: http://scala-tools.org/repo-releases/net/liftweb/lift-archetype-basic/1.0/lift-archetype-basic-1.0.jar 15K downloaded Define value for version: 1.0-SNAPSHOT: : Confirm properties configuration: groupId: com.biosimilarity.identity artifactId: testLift280 version: 1.0-SNAPSHOT package: com.biosimilarity.identity Y: : [INFO] [INFO] Using following parameters for creating OldArchetype: lift-archetype-basic:1.0 [INFO] [INFO] Parameter: groupId, Value: com.biosimilarity.identity [INFO] Parameter: packageName, Value: com.biosimilarity.identity [INFO] Parameter: basedir, Value: /Users/lgm/work/src/projex/biosimilarity [INFO] Parameter: package, Value: com.biosimilarity.identity [INFO] Parameter: version, Value: 1.0-SNAPSHOT [INFO] Parameter: artifactId, Value: testLift280 [INFO] * End of debug info from resources from generated POM *** [INFO] OldArchetype created in dir: /Users/lgm/work/src/projex/biosimilarity/testLift280 [INFO] [INFO] BUILD SUCCESSFUL [INFO] [INFO] Total time: 12 seconds [INFO] Finished at: Fri Jan 29 10:28:16 PST 2010 [INFO] Final Memory: 8M/15M [INFO] bash-3.2$ cd testLift280/ bash-3.2$ mvn -U clean compile [INFO] Scanning for projects... [INFO] [INFO] Building testLift280 [INFO]task-segment: [clean, compile] [INFO] [INFO] artifact org.scala-tools:maven-scala-plugin: checking for updates from scala-tools.org [INFO] artifact org.scala-tools:maven-scala-plugin: checking for updates from central [INFO] artifact org.mortbay.jetty:maven-jetty-plugin: checking for updates from scala-tools.org [INFO] artifact org.mortbay.jetty:maven-jetty-plugin: checking for updates from central [INFO] artifact net.sf.alchim:yuicompressor-maven-plugin: checking for updates from scala-tools.org [INFO] artifact net.sf.alchim:yuicompressor-maven-plugin: checking for updates from central [INFO] artifact org.apache.maven.plugins:maven-eclipse-plugin: checking for updates from scala-tools.org [INFO] artifact org.apache.maven.plugins:maven-eclipse-plugin: checking for updates from central [INFO] [clean:clean] [INFO] [resources:resources] [INFO] Using default encoding to copy filtered resources.
Re: [Lift] Lift and Scala 2.8 Beta1
Dear Indrajit, i have a lot better luck with this way of testing before plunging if i change my archetype generation script to use -DarchetypeVersion=2.0-M1. Best wishes, --greg On Fri, Jan 29, 2010 at 10:37 AM, Meredith Gregory lgreg.mered...@gmail.com wrote: Dear Indrajit, Thanks for your diligence on this effort! However, i'm not having a lot of luck. Here's my methodology. - i would like to test using an archetype generated project before i test with my project code -- which is likely to be so stupid and error-ridden as to cause all kinds of problems. i've got a feeling that the archetype i'm getting is out of sync (please see the script i use and the trace it generates). - After generating the project from the archetype i change the lift version as you indicate and the lift jars cannot be resolved. This may have to do with the problem above. Best wishes, --greg - Script #! /bin/sh mvn archetype:generate -U \ -DarchetypeGroupId=net.liftweb \ -DarchetypeArtifactId=lift-archetype-basic \ -DarchetypeVersion=1.0 \ -DremoteRepositories=http://scala-tools.org/repo-releases \ -DgroupId=$1 -DartifactId=$2 - Trace bash-3.2$ bin/mklift.sh com.biosimilarity.identity testLift280 [INFO] Scanning for projects... [INFO] Searching repository for plugin with prefix: 'archetype'. [INFO] org.apache.maven.plugins: checking for updates from central [INFO] org.codehaus.mojo: checking for updates from central [INFO] artifact org.apache.maven.plugins:maven-archetype-plugin: checking for updates from central [INFO] [INFO] Building Maven Default Project [INFO]task-segment: [archetype:generate] (aggregator-style) [INFO] [INFO] Preparing archetype:generate [INFO] No goals needed for project - skipping [INFO] Setting property: classpath.resource.loader.class = 'org.codehaus.plexus.velocity.ContextClassLoaderResourceLoader'. [INFO] Setting property: velocimacro.messages.on = 'false'. [INFO] Setting property: resource.loader = 'classpath'. [INFO] Setting property: resource.manager.logwhenfound = 'false'. [INFO] [archetype:generate] [INFO] Generating project in Interactive mode [INFO] Archetype repository missing. Using the one from [net.liftweb:lift-archetype-basic:RELEASE - http://scala-tools.org/repo-releases] found in catalog internal Downloading: http://scala-tools.org/repo-releases/net/liftweb/lift-archetype-basic/1.0/lift-archetype-basic-1.0.jar 15K downloaded Define value for version: 1.0-SNAPSHOT: : Confirm properties configuration: groupId: com.biosimilarity.identity artifactId: testLift280 version: 1.0-SNAPSHOT package: com.biosimilarity.identity Y: : [INFO] [INFO] Using following parameters for creating OldArchetype: lift-archetype-basic:1.0 [INFO] [INFO] Parameter: groupId, Value: com.biosimilarity.identity [INFO] Parameter: packageName, Value: com.biosimilarity.identity [INFO] Parameter: basedir, Value: /Users/lgm/work/src/projex/biosimilarity [INFO] Parameter: package, Value: com.biosimilarity.identity [INFO] Parameter: version, Value: 1.0-SNAPSHOT [INFO] Parameter: artifactId, Value: testLift280 [INFO] * End of debug info from resources from generated POM *** [INFO] OldArchetype created in dir: /Users/lgm/work/src/projex/biosimilarity/testLift280 [INFO] [INFO] BUILD SUCCESSFUL [INFO] [INFO] Total time: 12 seconds [INFO] Finished at: Fri Jan 29 10:28:16 PST 2010 [INFO] Final Memory: 8M/15M [INFO] bash-3.2$ cd testLift280/ bash-3.2$ mvn -U clean compile [INFO] Scanning for projects... [INFO] [INFO] Building testLift280 [INFO]task-segment: [clean, compile] [INFO] [INFO] artifact org.scala-tools:maven-scala-plugin: checking for updates from scala-tools.org [INFO] artifact org.scala-tools:maven-scala-plugin: checking for updates from central [INFO] artifact org.mortbay.jetty:maven-jetty-plugin: checking for updates from scala-tools.org [INFO] artifact org.mortbay.jetty:maven-jetty-plugin: checking for updates from central [INFO] artifact net.sf.alchim:yuicompressor-maven-plugin: checking for updates from scala-tools.org [INFO] artifact
Re: [Lift Announce] Re: [Lift] Lift and Scala 2.8 Beta1
Dear Indrajit, -DarchetypeVersion=2.0-scala280-SNAPSHOT was the first thing i tried and that failed. ;-( Best wishes, --greg On Fri, Jan 29, 2010 at 11:15 AM, David Pollak feeder.of.the.be...@gmail.com wrote: On Thu, Jan 28, 2010 at 9:04 PM, Indrajit Raychaudhuri indraj...@gmail.com wrote: The Lift 2.0 snapshot jars for Scala 2.8 are now available on scala-tools Maven repository. Feel free to try your Lift application against 2.0-scala280-SNAPSHOT jars. You can change Lift artifact dependencies version to 2.0-scala280-SNAPSHOT in you application pom and proceed to build as usual. Awesome! Let the Lift on Scala 2.8 Beta1 testing and feedback commence. Cheers, Indrajit On 28/01/10 2:31 AM, David Pollak wrote: Folks, Lift is currently building against Scala 2.8 Beta1 and currently runs the examples/example app (the app that's at http://demo.liftweb.net). We have disabled many of the tests during the automated build because as of last night, not all the test frameworks (ScalaTest, Specs, and ScalaCheck) were compiled against 2.8 Beta1. We are doing continuous builds of Lift against the 280_port_refresh branch at http://hudson.scala-tools.org/job/lift-scala280/ And will be publishing to the scala-tools.org http://scala-tools.org Maven repository very soon now (today or tomorrow). Once we get the JAR files publishing to the Scala-tools.org Maven repository, we will open up the Lift list to report of problems running Lift apps against 2.8 Beta 1. Please do not file tickets until there's been a discussion on the Lift list. Thanks, David -- Lift, the simply functional web framework http://liftweb.net Beginning Scala http://www.apress.com/book/view/1430219890 Follow me: http://twitter.com/dpp Surf the harmonics -- You received this message because you are subscribed to the Google Groups Lift group. To post to this group, send email to lift...@googlegroups.com. To unsubscribe from this group, send email to liftweb+unsubscr...@googlegroups.comliftweb%2bunsubscr...@googlegroups.com . For more options, visit this group at http://groups.google.com/group/liftweb?hl=en. -- Lift, the simply functional web framework http://liftweb.net Beginning Scala http://www.apress.com/book/view/1430219890 Follow me: http://twitter.com/dpp Surf the harmonics -- You received this message because you are subscribed to the Google Groups Lift group. To post to this group, send email to lift...@googlegroups.com. To unsubscribe from this group, send email to liftweb+unsubscr...@googlegroups.comliftweb%2bunsubscr...@googlegroups.com . For more options, visit this group at http://groups.google.com/group/liftweb?hl=en. -- L.G. Meredith Managing Partner Biosimilarity LLC 1219 NW 83rd St Seattle, WA 98117 +1 206.650.3740 http://biosimilarity.blogspot.com -- You received this message because you are subscribed to the Google Groups Lift group. To post to this group, send email to lift...@googlegroups.com. To unsubscribe from this group, send email to liftweb+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/liftweb?hl=en.
Re: [Lift Announce] Re: [Lift] Lift and Scala 2.8 Beta1
Dear Indrajit, See the trace below with the archetypeVersion set as you suggest. Best wishes, --greg bash-3.2$ bin/mklift.sh com.biosimilarity.identity WhiteRabbit [INFO] Scanning for projects... [INFO] Searching repository for plugin with prefix: 'archetype'. [INFO] org.apache.maven.plugins: checking for updates from central [INFO] org.codehaus.mojo: checking for updates from central [INFO] artifact org.apache.maven.plugins:maven-archetype-plugin: checking for updates from central [INFO] [INFO] Building Maven Default Project [INFO]task-segment: [archetype:generate] (aggregator-style) [INFO] [INFO] Preparing archetype:generate [INFO] No goals needed for project - skipping [INFO] Setting property: classpath.resource.loader.class = 'org.codehaus.plexus.velocity.ContextClassLoaderResourceLoader'. [INFO] Setting property: velocimacro.messages.on = 'false'. [INFO] Setting property: resource.loader = 'classpath'. [INFO] Setting property: resource.manager.logwhenfound = 'false'. [INFO] [archetype:generate] [INFO] Generating project in Interactive mode [INFO] Archetype repository missing. Using the one from [net.liftweb:lift-archetype-basic:RELEASE - http://scala-tools.org/repo-releases] found in catalog internal [INFO] snapshot net.liftweb:lift-archetype-basic:2.0-scala280-SNAPSHOT: checking for updates from lift-archetype-basic-repo Downloading: http://scala-tools.org/repo-releases/net/liftweb/lift-archetype-basic/2.0-scala280-SNAPSHOT/lift-archetype-basic-2.0-scala280-SNAPSHOT.jar [INFO] [ERROR] BUILD FAILURE [INFO] [INFO] The desired archetype does not exist (net.liftweb:lift-archetype-basic:2.0-scala280-SNAPSHOT) [INFO] [INFO] For more information, run Maven with the -e switch [INFO] [INFO] Total time: 5 seconds [INFO] Finished at: Fri Jan 29 11:19:16 PST 2010 [INFO] Final Memory: 8M/15M [INFO] bash-3.2$ On Fri, Jan 29, 2010 at 11:16 AM, Meredith Gregory lgreg.mered...@gmail.com wrote: Dear Indrajit, -DarchetypeVersion=2.0-scala280-SNAPSHOT was the first thing i tried and that failed. ;-( Best wishes, --greg On Fri, Jan 29, 2010 at 11:15 AM, David Pollak feeder.of.the.be...@gmail.com wrote: On Thu, Jan 28, 2010 at 9:04 PM, Indrajit Raychaudhuri indraj...@gmail.com wrote: The Lift 2.0 snapshot jars for Scala 2.8 are now available on scala-tools Maven repository. Feel free to try your Lift application against 2.0-scala280-SNAPSHOT jars. You can change Lift artifact dependencies version to 2.0-scala280-SNAPSHOT in you application pom and proceed to build as usual. Awesome! Let the Lift on Scala 2.8 Beta1 testing and feedback commence. Cheers, Indrajit On 28/01/10 2:31 AM, David Pollak wrote: Folks, Lift is currently building against Scala 2.8 Beta1 and currently runs the examples/example app (the app that's at http://demo.liftweb.net). We have disabled many of the tests during the automated build because as of last night, not all the test frameworks (ScalaTest, Specs, and ScalaCheck) were compiled against 2.8 Beta1. We are doing continuous builds of Lift against the 280_port_refresh branch at http://hudson.scala-tools.org/job/lift-scala280/ And will be publishing to the scala-tools.org http://scala-tools.org Maven repository very soon now (today or tomorrow). Once we get the JAR files publishing to the Scala-tools.org Maven repository, we will open up the Lift list to report of problems running Lift apps against 2.8 Beta 1. Please do not file tickets until there's been a discussion on the Lift list. Thanks, David -- Lift, the simply functional web framework http://liftweb.net Beginning Scala http://www.apress.com/book/view/1430219890 Follow me: http://twitter.com/dpp Surf the harmonics -- You received this message because you are subscribed to the Google Groups Lift group. To post to this group, send email to lift...@googlegroups.com. To unsubscribe from this group, send email to liftweb+unsubscr...@googlegroups.comliftweb%2bunsubscr...@googlegroups.com . For more options, visit this group at http://groups.google.com/group/liftweb?hl=en. -- Lift, the simply functional web framework http://liftweb.net Beginning Scala http://www.apress.com/book/view/1430219890 Follow me: http://twitter.com/dpp Surf the harmonics -- You received this message because you are subscribed to the Google Groups Lift group. To post to this group, send email to lift...@googlegroups.com. To unsubscribe from this group, send email
Re: [Lift Announce] Re: [Lift] Lift and Scala 2.8 Beta1
Dear Indrajit, Thanks! That works. Best wishes, --greg On Fri, Jan 29, 2010 at 11:27 AM, Indrajit Raychaudhuri indraj...@gmail.com wrote: For SNAPSHOTs, you need to add the SNAPSHOT repo explicitly. Try this command: mvn archetype:generate -U \ -DarchetypeGroupId=net.liftweb \ -DarchetypeArtifactId=lift-archetype-basic \ -DarchetypeVersion=2.0-scala280-SNAPSHOT \ -DarchetypeRepository=http://scala-tools.org/repo-snapshots \ -DremoteRepositories=http://scala-tools.org/repo-snapshots \ -DgroupId=$1 -DartifactId=$2 NB: My previous reply was a supplement of this one: http://groups.google.com/group/liftweb/msg/0734a3a1b7d0424d Cheers, Indrajit On 30/01/10 12:50 AM, Meredith Gregory wrote: Dear Indrajit, See the trace below with the archetypeVersion set as you suggest. Best wishes, --greg bash-3.2$ bin/mklift.sh com.biosimilarity.identity WhiteRabbit [INFO] Scanning for projects... [INFO] Searching repository for plugin with prefix: 'archetype'. [INFO] org.apache.maven.plugins: checking for updates from central [INFO] org.codehaus.mojo: checking for updates from central [INFO] artifact org.apache.maven.plugins:maven-archetype-plugin: checking for updates from central [INFO] [INFO] Building Maven Default Project [INFO]task-segment: [archetype:generate] (aggregator-style) [INFO] [INFO] Preparing archetype:generate [INFO] No goals needed for project - skipping [INFO] Setting property: classpath.resource.loader.class = 'org.codehaus.plexus.velocity.ContextClassLoaderResourceLoader'. [INFO] Setting property: velocimacro.messages.on = 'false'. [INFO] Setting property: resource.loader = 'classpath'. [INFO] Setting property: resource.manager.logwhenfound = 'false'. [INFO] [archetype:generate] [INFO] Generating project in Interactive mode [INFO] Archetype repository missing. Using the one from [net.liftweb:lift-archetype-basic:RELEASE - http://scala-tools.org/repo-releases] found in catalog internal [INFO] snapshot net.liftweb:lift-archetype-basic:2.0-scala280-SNAPSHOT: checking for updates from lift-archetype-basic-repo Downloading: http://scala-tools.org/repo-releases/net/liftweb/lift-archetype-basic/2.0-scala280-SNAPSHOT/lift-archetype-basic-2.0-scala280-SNAPSHOT.jar [INFO] [ERROR] BUILD FAILURE [INFO] [INFO] The desired archetype does not exist (net.liftweb:lift-archetype-basic:2.0-scala280-SNAPSHOT) [INFO] [INFO] For more information, run Maven with the -e switch [INFO] [INFO] Total time: 5 seconds [INFO] Finished at: Fri Jan 29 11:19:16 PST 2010 [INFO] Final Memory: 8M/15M [INFO] bash-3.2$ On Fri, Jan 29, 2010 at 11:16 AM, Meredith Gregory lgreg.mered...@gmail.com mailto:lgreg.mered...@gmail.com wrote: Dear Indrajit, -DarchetypeVersion=2.0-scala280-SNAPSHOT was the first thing i tried and that failed. ;-( Best wishes, --greg On Fri, Jan 29, 2010 at 11:15 AM, David Pollak feeder.of.the.be...@gmail.com mailto:feeder.of.the.be...@gmail.com wrote: On Thu, Jan 28, 2010 at 9:04 PM, Indrajit Raychaudhuri indraj...@gmail.com mailto:indraj...@gmail.com wrote: The Lift 2.0 snapshot jars for Scala 2.8 are now available on scala-tools Maven repository. Feel free to try your Lift application against 2.0-scala280-SNAPSHOT jars. You can change Lift artifact dependencies version to 2.0-scala280-SNAPSHOT in you application pom and proceed to build as usual. Awesome! Let the Lift on Scala 2.8 Beta1 testing and feedback commence. Cheers, Indrajit On 28/01/10 2:31 AM, David Pollak wrote: Folks, Lift is currently building against Scala 2.8 Beta1 and currently runs the examples/example app (the app that's at http://demo.liftweb.net). We have disabled many of the tests during the automated build because as of last night, not all the test frameworks (ScalaTest, Specs, and ScalaCheck) were compiled against 2.8 Beta1. We are doing continuous builds of Lift against the 280_port_refresh branch at http://hudson.scala-tools.org/job/lift-scala280/ And will be publishing to the scala-tools.org http
Re: [Lift] Lift and Scala 2.8 Beta1
Dear David, Did the jars get pushed up to the Scala-tools.org Maven repository? Best wishes, --greg On Wed, Jan 27, 2010 at 1:01 PM, David Pollak feeder.of.the.be...@gmail.com wrote: Folks, Lift is currently building against Scala 2.8 Beta1 and currently runs the examples/example app (the app that's at http://demo.liftweb.net). We have disabled many of the tests during the automated build because as of last night, not all the test frameworks (ScalaTest, Specs, and ScalaCheck) were compiled against 2.8 Beta1. We are doing continuous builds of Lift against the 280_port_refresh branch at http://hudson.scala-tools.org/job/lift-scala280/ And will be publishing to the scala-tools.org Maven repository very soon now (today or tomorrow). Once we get the JAR files publishing to the Scala-tools.org Maven repository, we will open up the Lift list to report of problems running Lift apps against 2.8 Beta 1. Please do not file tickets until there's been a discussion on the Lift list. Thanks, David -- Lift, the simply functional web framework http://liftweb.net Beginning Scala http://www.apress.com/book/view/1430219890 Follow me: http://twitter.com/dpp Surf the harmonics -- You received this message because you are subscribed to the Google Groups Lift group. To post to this group, send email to lift...@googlegroups.com. To unsubscribe from this group, send email to liftweb+unsubscr...@googlegroups.comliftweb%2bunsubscr...@googlegroups.com . For more options, visit this group at http://groups.google.com/group/liftweb?hl=en. -- L.G. Meredith Managing Partner Biosimilarity LLC 1219 NW 83rd St Seattle, WA 98117 +1 206.650.3740 http://biosimilarity.blogspot.com -- You received this message because you are subscribed to the Google Groups Lift group. To post to this group, send email to lift...@googlegroups.com. To unsubscribe from this group, send email to liftweb+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/liftweb?hl=en.
[Lift] Re: [scala] EclipseLink?
Dear Ismael, i got buried under some other work and forgot to thank you for this note. If you look further down on the web page you referenced you will see that the pom.xml snippets they include have the characters escaped as you suggested. i cut and pasted these into my pom.xml for my experiments and the download failed. Best wishes, --greg On Mon, Sep 28, 2009 at 9:07 PM, Ismael Juma mli...@juma.me.uk wrote: On Mon, 2009-09-28 at 13:53 -0700, Meredith Gregory wrote: Dear Ismael, Thanks. i knew about that and tried it. My version of maven barf'ed on the download url and so it didn't work for me. i would much prefer not to have to ferret out and maintain the jar myself. ;-) That's probably because you didn't escape the characters in the XML, the following works: http://www.eclipse.org/downloads/download.php?r=1amp;nf=1amp;file=/rt/eclipselink/maven.repo Best, Ismael -- L.G. Meredith Managing Partner Biosimilarity LLC 1219 NW 83rd St Seattle, WA 98117 +1 206.650.3740 http://biosimilarity.blogspot.com --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups Lift group. To post to this group, send email to liftweb@googlegroups.com To unsubscribe from this group, send email to liftweb+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/liftweb?hl=en -~--~~~~--~~--~--~---
[Lift] Re: [scala] EclipseLink?
Dear Ismael, Prompted by this thread i did some digging and saw that in the attempt to move from hibernate to toplink to eclipselink i had not consistently switched from toplink to eclipselink. So, i'm now getting the download to work. Thanks again. BTW, i wonder if you know whether eclipselink has equivalents to the maven-hibernate targets for generating ddl and such. Best wishes, --greg On Tue, Oct 6, 2009 at 1:25 PM, Ismael Juma mli...@juma.me.uk wrote: On Tue, 2009-10-06 at 09:47 -0700, Meredith Gregory wrote: Dear Ismael, i got buried under some other work and forgot to thank you for this note. If you look further down on the web page you referenced you will see that the pom.xml snippets they include have the characters escaped as you suggested. i cut and pasted these into my pom.xml for my experiments and the download failed. That is strange as I have been using that repository for many months now. Ismael -- L.G. Meredith Managing Partner Biosimilarity LLC 1219 NW 83rd St Seattle, WA 98117 +1 206.650.3740 http://biosimilarity.blogspot.com --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups Lift group. To post to this group, send email to liftweb@googlegroups.com To unsubscribe from this group, send email to liftweb+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/liftweb?hl=en -~--~~~~--~~--~--~---
[Lift] Re: Removing Scala Actors from Lift
Dear David, i don't really see this as losing our Scala Actors so much as *gaining* an interface. Surely, someone can wire up Scala Actors to that interface if there is a need. ;-) Best wishes, --greg On Mon, Sep 28, 2009 at 7:30 PM, David Pollak feeder.of.the.be...@gmail.com wrote: Folks, Given the continued instability of Scala Actors, I've decided to remove them from Lift. Specifically, I'm migrating CometActors to sit on top of Lift's Actors. But, you'll also be able to use Akka Actors to power Lift's CometActors. Specifically, I'm working with Jonas to make sure that we share a common interface to Actors. I've gotten Lift nearly completely migrated over to Lift's Actors on the dpp_wip_actorize branch. See http://github.com/dpp/liftweb/tree/dpp_wip_actorize There will be some breaking changes to your applications. Specifically: - Box will be moved to a new package, net.liftweb.base (this is where the interface for Actors will live as well) - If you make any assumptions about your CometActors being Scala Actors (e.g., using linking), you will have to rewrite this code - Some methods in Lift that currently take Scala Actors as parameters will take Lift Actors (e.g., ActorPing) There will be a parallel Maven repository with the new Lift Actor stuff in it so you will be able to build you apps against the new code before the official switch-over. Milestone 6 (which should be out next week) will be based on the existing Actor model. After we get feedback from the community about the new Actor stuff, we will switch -SNAPSHOT over to the new Actor stuff. Questions, thoughts, or comments? Thanks, David -- Lift, the simply functional web framework http://liftweb.net Beginning Scala http://www.apress.com/book/view/1430219890 Follow me: http://twitter.com/dpp Surf the harmonics -- L.G. Meredith Managing Partner Biosimilarity LLC 1219 NW 83rd St Seattle, WA 98117 +1 206.650.3740 http://biosimilarity.blogspot.com --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups Lift group. To post to this group, send email to liftweb@googlegroups.com To unsubscribe from this group, send email to liftweb+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/liftweb?hl=en -~--~~~~--~~--~--~---
[Lift] Re: [scala] EclipseLink?
Dear Ismael, Thanks. i knew about that and tried it. My version of maven barf'ed on the download url and so it didn't work for me. i would much prefer not to have to ferret out and maintain the jar myself. ;-) Best wishes, --greg On Mon, Sep 28, 2009 at 12:56 PM, Ismael Juma mli...@juma.me.uk wrote: Hey Greg, On Mon, 2009-09-28 at 10:57 -0700, Meredith Gregory wrote: Is there maven support? http://wiki.eclipse.org/EclipseLink/Maven Ismael -- L.G. Meredith Managing Partner Biosimilarity LLC 1219 NW 83rd St Seattle, WA 98117 +1 206.650.3740 http://biosimilarity.blogspot.com --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups Lift group. To post to this group, send email to liftweb@googlegroups.com To unsubscribe from this group, send email to liftweb+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/liftweb?hl=en -~--~~~~--~~--~--~---
[Lift] Re: You are not banned from this group!!
Dear Oliver, As a father of five, i know the feeling. Sending good will and good wishes to you and yours, --greg On Thu, Sep 24, 2009 at 6:29 AM, Oliver Lambert olambo...@gmail.com wrote: My son was born a week ago, with a heart defect that has just been operated on - I've been biting my nails for months and haven't felt like communicating or working. Things are starting to look good for him so maybe Im back. cheers Oliver On Thu, Sep 24, 2009 at 12:08 PM, Charles F. Munat c...@munat.com wrote: Funny, I was just wondering what happened to you maybe two days ago. Are you back, or just checking in? Chas. Oliver Lambert wrote: On Tue, Sep 22, 2009 at 7:21 AM, David Pollak feeder.of.the.be...@gmail.com mailto:feeder.of.the.be...@gmail.com wrote: I will gladly buy beer/coffee/food for anyone who gets such a notice. I sincerely apologize for any problems this is causing. Can you send me such a notice, I'd like a beer! Oh, and I've been away for a while, its nice to see the lift mailing list is going so strong. Oliver -- L.G. Meredith Managing Partner Biosimilarity LLC 1219 NW 83rd St Seattle, WA 98117 +1 206.650.3740 http://biosimilarity.blogspot.com --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups Lift group. To post to this group, send email to liftweb@googlegroups.com To unsubscribe from this group, send email to liftweb+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/liftweb?hl=en -~--~~~~--~~--~--~---
[Lift] Re: You are not banned from this group!!
Dear David, My coffee addiction says i'm feeling very banned. Best wishes, --greg On Wed, Sep 23, 2009 at 7:08 PM, Charles F. Munat c...@munat.com wrote: Funny, I was just wondering what happened to you maybe two days ago. Are you back, or just checking in? Chas. Oliver Lambert wrote: On Tue, Sep 22, 2009 at 7:21 AM, David Pollak feeder.of.the.be...@gmail.com mailto:feeder.of.the.be...@gmail.com wrote: I will gladly buy beer/coffee/food for anyone who gets such a notice. I sincerely apologize for any problems this is causing. Can you send me such a notice, I'd like a beer! Oh, and I've been away for a while, its nice to see the lift mailing list is going so strong. Oliver -- L.G. Meredith Managing Partner Biosimilarity LLC 1219 NW 83rd St Seattle, WA 98117 +1 206.650.3740 http://biosimilarity.blogspot.com --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups Lift group. To post to this group, send email to liftweb@googlegroups.com To unsubscribe from this group, send email to liftweb+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/liftweb?hl=en -~--~~~~--~~--~--~---
[Lift] Where's LiftFilter connected in with LiftServlet?
Dear Lifted,
bash-3.2$ cd liftweb/
bash-3.2$ ls
builtin http sitemap
bash-3.2$ find . -name *.scala -exec grep LiftFilter '{}' \; -print
class LiftFilter extends ServletFilterProvider
./http/LiftServlet.scala
* @see LiftFilter
./http/S.scala
bash-3.2$
The web.xml file references LiftFilter. The class LiftFilter extends the
Java class ServletFilterProvider and has no body. It looks like all the
logic is in LiftServlet. What makes the connection?
Best wishes,
--greg
--
L.G. Meredith
Managing Partner
Biosimilarity LLC
1219 NW 83rd St
Seattle, WA 98117
+1 206.650.3740
http://biosimilarity.blogspot.com
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You received this message because you are subscribed to the Google Groups
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[Lift] Re: Welcome Indrajit Raychaudhuri to the Lift Committers
Indrajit! Glad you could join the party! B.w. --greg On Fri, Sep 18, 2009 at 6:54 PM, marius d. marius.dan...@gmail.com wrote: Outstanding! Welcome aboard! Br's, Marius On Sep 18, 7:00 pm, David Pollak feeder.of.the.be...@gmail.com wrote: Folks, Please join me in welcoming Indrajit Raychaudhuri to the Lift committers. Indrajit has been very visible on the Lift list of late, offering lots of good solutions to people's questions. He's got some ideas of improving the Lift Maven infrastructure and build process and will be contributing to the build side (and may substantive code side) of Lift. Thanks, David -- Lift, the simply functional web frameworkhttp://liftweb.net Beginning Scalahttp://www.apress.com/book/view/1430219890 Follow me:http://twitter.com/dpp Git some:http://github.com/dpp -- L.G. Meredith Managing Partner Biosimilarity LLC 1219 NW 83rd St Seattle, WA 98117 +1 206.650.3740 http://biosimilarity.blogspot.com --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups Lift group. To post to this group, send email to liftweb@googlegroups.com To unsubscribe from this group, send email to liftweb+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/liftweb?hl=en -~--~~~~--~~--~--~---
[Lift] Re: Notes from 8/19/09 Lift Committers Call - LIFT SESSION REPLICATION DISCUSSION
David,
Can one leave proxies in place for things that are not actually
serializable?
Best wishes,
--greg
On Mon, Aug 24, 2009 at 12:55 PM, David Pollak
feeder.of.the.be...@gmail.com wrote:
On Mon, Aug 24, 2009 at 12:36 PM, marius d. marius.dan...@gmail.comwrote:
Just a FYI. I briefly talked with Martin and he said this idea is
possible but quite tricky. Stephane Micheloud did something similar
and he may share some of his work. I'm waiting some feedback from him.
I think we can do it at runtime in development mode. This is just for data
gathering, not for actual implementation. We just need to calculate whether
a given class is serializable once... so we don't have to worry about cyclic
graphs or anything else... just... are the slots (instance variables) for
each class serializable.
Br's,
Marius
On Aug 24, 10:46 am, marius d. marius.dan...@gmail.com wrote:
On Aug 24, 10:39 am, Viktor Klang viktor.kl...@gmail.com wrote:
On Mon, Aug 24, 2009 at 8:13 AM, marius d. marius.dan...@gmail.com
wrote:
On Aug 24, 12:06 am, David Pollak feeder.of.the.be...@gmail.com
wrote:
On Sun, Aug 23, 2009 at 10:45 AM, marius d.
marius.dan...@gmail.com
wrote:
Hmmm .. I'm wondering if we can write aScalacompilerpluginthat
transform functions provided to Lift's S/SHtml function etc.
into a
richer FunctionX implementation that knows how to serialize
it's
members. We could restrict the types that as LiftSerializable on
top
of primitives, Calenars, SessionVar/RequestVar etc. If users
need
their own classes to be LiftSerilizable they would have to
implement
LiftSerializable trait.
I think we can do it without explicit traits. I think we just
need to
walk
the graph for everything that's added to the LiftSession and see
where it
leads. Any graph we can walk is something that we can
serialize... even
without Java serialization. Any graph that ends in globals or
some class
that refers to native stuff (e.g., IO), then we're toast.
Totally agree. The rationale for explicit LiftSerializable would be
just for user defined types. Otherwise user's won't have to use it.
Graphs may also have be cyclic paths ... it shouldn't be too big of
a
pain though. Furthermore if a dependency graph path leads say to an
IO
reference maybe that's unintentional user code doesn't really use
that
but compiler put it for whatever reason. If such cases are possible
and could be determined maybe we could exclude that silently from
the
serialization operation and add a compile time warning.
I guess we need to dig more intoscalacompilerpluginsystem.
1. Isn't there a problem with references _inside_ methods that are
impure/sideeffecting?
s = { Db.myCachedInfoNotInSession foo s }
Regarding member references, a simple check for transient
(sca...@transient == java *transient*) to forcve people to use
transient
members for non-serializable state.
But IMHO the serialization problem is a (negative?) sideeffect of
Lifts rich
model GUID=Func approach.
Perhpas there is a middle way, a way where we can replicate just
enough to
survive a node crash?
That's exactly it. We probably don't need everything that Java
Serialization does. Just enough to make it consistent ... the
dependency graphs that is actually used by the user's function.
Thoughts?
Br's,
Marius
On Aug 23, 8:30 pm, marius d. marius.dan...@gmail.com
wrote:
At a first glace Java serialization is needed because of its
awareness
of the reference graph. But in the same time it does not
perform
well.
One way might be the byte level instrumentation that would
induce
code
to figure out the reference graph and know how to stream-ify
it using
a given efficient protocol. But that induces risks and it
involves
tons of work. I think would be doable though.
The problem is not really the technology of propagating
session
information to other nodes. That's the easiest part, but tough
one is
figuring out the low level reference graph and serialization
semantics. This is why JINI, JavaSpaces, JGroups, CORBA, JXTA,
you
name it, are unlikely to help solving the fundamental problem.
Br's,
Marius
On Aug 23, 8:16 pm, Arthur avand...@gmail.com wrote:
On Sun, Aug 23, 2009 at 7:04 PM, David
Pollakfeeder.of.the.be...@gmail.com wrote:
On Sun, Aug 23, 2009 at 4:50 AM, Kevin Wright
kev.lee.wri...@googlemail.com wrote:
I'm wondering if we can't leverage JavaSpaces to handle a
lot of
this
stuff. From my experience with the technology it seems
to be a
pretty good
fit for the problem.
Two reasons:
- JavaSpaces is as far as I know, GPL and we will not mix
[Lift] id selectors discouraged?
Lifted, At the pixillion master http://github.com/leithaus/pixillion/tree/masteri've an example where it appears that id selectors are not working correctly... Or, maybe i just don't know how to use CSS. The site map (after login) will show three pages of interest: paint, chat, combo. Paint is raw js without lift intervention and works as intended (for now). Chat is cribbed from the lift chat example. Combo attempts to put the two on the same page with lift tags in the drivers seat. As you can see the style is not being governed in the same way on the combo page, causing erroneous behavior in the paint rendering. Any help would be greatly appreciated. Best wishes, --greg -- L.G. Meredith Managing Partner Biosimilarity LLC 1219 NW 83rd St Seattle, WA 98117 +1 206.650.3740 http://biosimilarity.blogspot.com --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups Lift group. To post to this group, send email to liftweb@googlegroups.com To unsubscribe from this group, send email to liftweb+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/liftweb?hl=en -~--~~~~--~~--~--~---
[Lift] Re: id selectors discouraged?
David,
Thanks! i've no idea why you guys put up with me, but i'm glad you do!
Best wishes,
--greg
On Mon, Aug 24, 2009 at 5:22 PM, David Pollak feeder.of.the.be...@gmail.com
wrote:
Please make sure you're using Scala 2.7.5 in your pom.xml
Please make sure that List(paint) is in lower case in your sitemap.
On Mon, Aug 24, 2009 at 3:53 PM, Meredith Gregory
lgreg.mered...@gmail.com wrote:
Lifted,
At the pixillion
masterhttp://github.com/leithaus/pixillion/tree/masteri've an example
where it appears that id selectors are not working
correctly... Or, maybe i just don't know how to use CSS. The site map (after
login) will show three pages of interest: paint, chat, combo. Paint is raw
js without lift intervention and works as intended (for now). Chat is
cribbed from the lift chat example. Combo attempts to put the two on the
same page with lift tags in the drivers seat. As you can see the style is
not being governed in the same way on the combo page, causing erroneous
behavior in the paint rendering. Any help would be greatly appreciated.
If you remove the:
lift:CSS.blueprint /
lift:CSS.fancyType /
lines from /templates-hidden/default.html, you'll get a much better
result. The CSS in Blueprint CSS is munging the CSS used by the paint
program.
Please take a look at Firebug... it's a debugger for browsers... you can
see exactly how the browser applies style to each element. It's mighty
helpful.
On other notes, any JavaScript on the page *must* be escaped in ![CDATA[
blocks:
script type=text/javascript
$(document).ready(function() {
/script
becomes:
script type=text/javascript
// ![CDATA[
$(document).ready(function() {
...
// ]]
/script
The change set I sent out the last time you used the pixillion stuff as an
example should be applied to your project. It fixes the Scala version issue
as well as the script escaping issue.
Best wishes,
--greg
--
L.G. Meredith
Managing Partner
Biosimilarity LLC
1219 NW 83rd St
Seattle, WA 98117
+1 206.650.3740
http://biosimilarity.blogspot.com
--
Lift, the simply functional web framework http://liftweb.net
Beginning Scala http://www.apress.com/book/view/1430219890
Follow me: http://twitter.com/dpp
Git some: http://github.com/dpp
--
L.G. Meredith
Managing Partner
Biosimilarity LLC
1219 NW 83rd St
Seattle, WA 98117
+1 206.650.3740
http://biosimilarity.blogspot.com
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[Lift] Re: Lift vs Rails
Jack, For my money Rails is somewhat more mature than lift, but lift is on a trajectory to overtake Rails feature-wise and is certainly already there performance-wise. The real issue, to me, is Scala vs Ruby. Quite apart from being more slightly more performant and equally expressive, the real win of Scala is its types allow you scale the code over time. What i mean by that is that a type system like Scala's allows you to - navigate code - substitute and refactor code while preserving properties - design for abstraction One of the biggest problems of Ruby code -- and seasoned Ruby devs will tell you this -- is that in a code block of 10 lines -- that is part of say a 100K line project -- if i point to a line of code, you can't tell me what it is doing. This is compounded by the fact that with monkey-patching, even if you thought you knew, with the next check-in in some other part of the codebase, you don't. In the same situation in Scala any given expression has a type that the compiler may infer. So, i don't need to know Joe Bloggs who wrote that block. i reason about what it does through the types. This gives better separation of *dev team*s -- not just code blocks. This is good if you want to scale up your efforts organizationally -- either by spreading it out over different groups working at approximately the same time, or by spreading development out over time. i'm not saying this is a silver bullet. Software is hard and there are always non-linear or cyclical dependencies, but types really help with practical development. After a while, you get to the point where you can design using types, and then cutting the code is like falling off a log. At this point designing for highly leveraged abstractions that significantly reduce the amount of code and increase the applicability of code is within your grasp. The guy who makes these points in a much less zealous and much more reasoned, dispassionate way with lots of practical examples is Bill Venners. His recent talk for JavaOne -- which is on video (i'll look for the link) -- is quite powerful in this regard. Heck, even Charles Nutter, in his own blog acknowledges that Scala is the heir apparent of Java for the JVM. Don't get me wrong -- i'm not a Scala biggot. There are a lot of corners of this language i don't like. For my money, Haskell is a better language. But, Haskell doesn't run on the JVM. You can't ship Haskell apps as jars or wars and smoothly hook them into maven repos, and you can't very easily build Haskell apps using standard JVM libs. So, that's why Scala, and that's why lift. Well... there's also the fact that the Scala and lift communities are populated by very impressive people who are very open and incredibly responsive. Best wishes, --greg On Sun, Aug 23, 2009 at 7:45 AM, jack jack.wid...@gmail.com wrote: I am doing a startup company that involves both a lot of processing on the backend (in the code) and a decent amount of comet/ajax in the frontend.It is very important that the code quickly on the server. I have seen the light with respect to Scala and Lift looks terrific. My only concern is how new it is and the availability of resources (programmers, books etc). I really do want to use Lift instead of Rails. Could somebody please convince me? :) -- L.G. Meredith Managing Partner Biosimilarity LLC 1219 NW 83rd St Seattle, WA 98117 +1 206.650.3740 http://biosimilarity.blogspot.com --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups Lift group. To post to this group, send email to liftweb@googlegroups.com To unsubscribe from this group, send email to liftweb+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/liftweb?hl=en -~--~~~~--~~--~--~---
[Lift] Re: clue for the clueless?
Everybody,
Thanks for the replies. The browser source is the same as from the chat
example, but i've included it below. The element in which the name space is
not bound is the first element with the chat name space.
Best wishes,
--greg
lift:surround with=default at=content
div class=widget sidebar
centerbGroup Chat/b/centerbr /
lift:comet type=Chat name=Other
chat:body
Hello chat:name/
ul chat:id=na
chat:list
lilist:when/ list:who/: ilist:msg//i/li
/chat:list
/ul
/chat:body
chat:input
chat:input/ input type=submit value=Post It /
/chat:input
/lift:comet
/div
p
The total chat app, including the ask/answer component for soliciting a
name
comments, etc. is listed on this page.
There is no special code to support AJAX/Comet
(all the wrapping is done automatically by iLift/i).
/p
p
When the Chat comet widget is added to the page, it needs to solict the
user for a chat name. It asks the AskName comet widget for the
name.
Until the AskName comet widget provides a name, all rendering messages
are forwarded to AskName.
Here's the code for the AskName:/p
style type=text/css
/* ![CDATA[ */
.comment {
/* font-lock-comment-face */
color: #b2;
}
.comment-delimiter {
/* font-lock-comment-delimiter-face */
color: #b2;
}
.constant {
/* font-lock-constant-face */
color: #5f9ea0;
}
.function-name {
/* font-lock-function-name-face */
color: #ff;
}
.keyword {
/* font-lock-keyword-face */
color: #a020f0;
}
.string {
/* font-lock-string-face */
color: #bc8f8f;
}
.type {
/* font-lock-type-face */
color: #228b22;
}
.variable-name {
/* font-lock-variable-name-face */
color: #b8860b;
}
/* ]] */
/style
pre
span class=keywordclass/span span class=typeAskName/span span
class=keywordextends/span span class=typeCometActor/span {
span class=keyworddef/span span class=function-namerender/span
=
ajaxForm(lt;divgt;What is your username?lt;/divgt; ++
text(span class=string/span,name =gt; answer(name.trim))
++
lt;input span class=keywordtype/span=span
class=stringsubmit/span value=span
class=stringEnter/span/gt;)
}
/pre
p
When the user submits the form, the question asked by the Chat comet
widget
is answered with the value the user submitted. This is
similar to the ask/answer paradigm in Seaside, except that there's
no need for continuations.
/p
pNow, onto the heart of the chat app:/p
pre
span class=keywordclass/span span class=typeChat/span span
class=keywordextends/span span class=typeCometActor/span span
class=keywordwith/span span class=typeCometListener/span {
span class=keywordprivate/span span class=keywordvar/span
span class=variable-nameuserName/span = span class=string/span
span class=keywordprivate/span span class=keywordvar/span
span class=variable-namechats/span: span
class=typeList[ChatLine]/span = Nil
span class=keywordprivate/span span class=keywordlazy/span
span class=keywordval/span span class=variable-nameinfoId/span =
uniqueId + span class=string_info/span
span class=keywordprivate/span span class=keywordlazy/span
span class=keywordval/span span class=variable-nameinfoIn/span =
uniqueId + span class=string_in/span
span class=keywordprivate/span span class=keywordlazy/span
span class=keywordval/span span
class=variable-nameinputArea/span = findKids(defaultXml, span
class=stringchat/span, span class=stringinput/span)
span class=keywordprivate/span span class=keywordlazy/span
span class=keywordval/span span class=variable-namebodyArea/span
= findKids(defaultXml, span class=stringchat/span, span
class=stringbody/span)
span class=keywordprivate/span span class=keywordlazy/span
span class=keywordval/span span
class=variable-namesingleLine/span = deepFindKids(bodyArea, span
class=stringchat/span, span class=stringlist/span)
span class=comment-delimiter// /spanspan class=commenthandle an
update to the chat lists
/span span class=comment-delimiter// /spanspan class=commentby
diffing the lists and then sending a partial update
/span span class=comment-delimiter// /spanspan class=commentto
the browser
/span span class=keywordoverride/span span
class=keyworddef/span span class=function-namelowPriority/span =
{
span class=keywordcase/span span
class=typeChatServerUpdate/span(span
class=variable-namevalue/span) =gt;
span class=keywordval/span span
class=variable-nameupdate/span = (value -- chats).reverse.map(b =gt;
AppendHtml(infoId, line(b)))
partialUpdate(update)
chats = value
}
span class=comment-delimiter// /spanspan class=commentrender the
input area by binding the
/span span class=comment-delimiter// /spanspan
class=commentappropriate
[Lift] Re: clue for the clueless?
David,
Thanks. i'll pop the recent changes up to github in a bit. i think it might
be easier to look at this as a whole.
Best wishes,
--greg
On Thu, Aug 20, 2009 at 11:19 AM, David Pollak
feeder.of.the.be...@gmail.com wrote:
On Thu, Aug 20, 2009 at 11:13 AM, Meredith Gregory
lgreg.mered...@gmail.com wrote:
Everybody,
Thanks for the replies. The browser source is the same as from the chat
example, but i've included it below. The element in which the name space is
not bound is the first element with the chat name space.
Greg,
This means that none of the page was processed by Lift. What URL are you
using to get to this page?
Thanks,
David
Best wishes,
--greg
lift:surround with=default at=content
div class=widget sidebar
centerbGroup Chat/b/centerbr /
lift:comet type=Chat name=Other
chat:body
Hello chat:name/
ul chat:id=na
chat:list
lilist:when/ list:who/: ilist:msg//i/li
/chat:list
/ul
/chat:body
chat:input
chat:input/ input type=submit value=Post It /
/chat:input
/lift:comet
/div
p
The total chat app, including the ask/answer component for soliciting
a
name
comments, etc. is listed on this page.
There is no special code to support AJAX/Comet
(all the wrapping is done automatically by iLift/i).
/p
p
When the Chat comet widget is added to the page, it needs to solict
the
user for a chat name. It asks the AskName comet widget for the
name.
Until the AskName comet widget provides a name, all rendering messages
are forwarded to AskName.
Here's the code for the AskName:/p
style type=text/css
/* ![CDATA[ */
.comment {
/* font-lock-comment-face */
color: #b2;
}
.comment-delimiter {
/* font-lock-comment-delimiter-face */
color: #b2;
}
.constant {
/* font-lock-constant-face */
color: #5f9ea0;
}
.function-name {
/* font-lock-function-name-face */
color: #ff;
}
.keyword {
/* font-lock-keyword-face */
color: #a020f0;
}
.string {
/* font-lock-string-face */
color: #bc8f8f;
}
.type {
/* font-lock-type-face */
color: #228b22;
}
.variable-name {
/* font-lock-variable-name-face */
color: #b8860b;
}
/* ]] */
/style
pre
span class=keywordclass/span span class=typeAskName/span span
class=keywordextends/span span class=typeCometActor/span {
span class=keyworddef/span span
class=function-namerender/span =
ajaxForm(lt;divgt;What is your username?lt;/divgt; ++
text(span class=string/span,name =gt;
answer(name.trim)) ++
lt;input span class=keywordtype/span=span
class=stringsubmit/span value=span
class=stringEnter/span/gt;)
}
/pre
p
When the user submits the form, the question asked by the Chat comet
widget
is answered with the value the user submitted. This is
similar to the ask/answer paradigm in Seaside, except that there's
no need for continuations.
/p
pNow, onto the heart of the chat app:/p
pre
span class=keywordclass/span span class=typeChat/span span
class=keywordextends/span span class=typeCometActor/span span
class=keywordwith/span span class=typeCometListener/span {
span class=keywordprivate/span span class=keywordvar/span
span class=variable-nameuserName/span = span class=string/span
span class=keywordprivate/span span class=keywordvar/span
span class=variable-namechats/span: span
class=typeList[ChatLine]/span = Nil
span class=keywordprivate/span span class=keywordlazy/span
span class=keywordval/span span class=variable-nameinfoId/span =
uniqueId + span class=string_info/span
span class=keywordprivate/span span class=keywordlazy/span
span class=keywordval/span span class=variable-nameinfoIn/span =
uniqueId + span class=string_in/span
span class=keywordprivate/span span class=keywordlazy/span
span class=keywordval/span span
class=variable-nameinputArea/span = findKids(defaultXml, span
class=stringchat/span, span class=stringinput/span)
span class=keywordprivate/span span class=keywordlazy/span
span class=keywordval/span span class=variable-namebodyArea/span
= findKids(defaultXml, span class=stringchat/span, span
class=stringbody/span)
span class=keywordprivate/span span class=keywordlazy/span
span class=keywordval/span span
class=variable-namesingleLine/span = deepFindKids(bodyArea, span
class=stringchat/span, span class=stringlist/span)
span class=comment-delimiter// /spanspan class=commenthandle
an update to the chat lists
/span span class=comment-delimiter// /spanspan
class=commentby diffing the lists and then sending a partial update
/span span class=comment-delimiter// /spanspan
class=commentto
[Lift] Re: clue for the clueless?
David, et al,
i pushed my little experiments back up to
githubhttp://github.com/leithaus/pixillion/tree/master.
Any thoughts or suggestions would be greatly appreciated.
Best wishes,
--greg
On Thu, Aug 20, 2009 at 11:23 AM, Meredith Gregory lgreg.mered...@gmail.com
wrote:
David,
Thanks. i'll pop the recent changes up to github in a bit. i think it might
be easier to look at this as a whole.
Best wishes,
--greg
On Thu, Aug 20, 2009 at 11:19 AM, David Pollak
feeder.of.the.be...@gmail.com wrote:
On Thu, Aug 20, 2009 at 11:13 AM, Meredith Gregory
lgreg.mered...@gmail.com wrote:
Everybody,
Thanks for the replies. The browser source is the same as from the chat
example, but i've included it below. The element in which the name space is
not bound is the first element with the chat name space.
Greg,
This means that none of the page was processed by Lift. What URL are you
using to get to this page?
Thanks,
David
Best wishes,
--greg
lift:surround with=default at=content
div class=widget sidebar
centerbGroup Chat/b/centerbr /
lift:comet type=Chat name=Other
chat:body
Hello chat:name/
ul chat:id=na
chat:list
lilist:when/ list:who/: ilist:msg//i/li
/chat:list
/ul
/chat:body
chat:input
chat:input/ input type=submit value=Post It /
/chat:input
/lift:comet
/div
p
The total chat app, including the ask/answer component for soliciting
a
name
comments, etc. is listed on this page.
There is no special code to support AJAX/Comet
(all the wrapping is done automatically by iLift/i).
/p
p
When the Chat comet widget is added to the page, it needs to solict
the
user for a chat name. It asks the AskName comet widget for the
name.
Until the AskName comet widget provides a name, all rendering
messages
are forwarded to AskName.
Here's the code for the AskName:/p
style type=text/css
/* ![CDATA[ */
.comment {
/* font-lock-comment-face */
color: #b2;
}
.comment-delimiter {
/* font-lock-comment-delimiter-face */
color: #b2;
}
.constant {
/* font-lock-constant-face */
color: #5f9ea0;
}
.function-name {
/* font-lock-function-name-face */
color: #ff;
}
.keyword {
/* font-lock-keyword-face */
color: #a020f0;
}
.string {
/* font-lock-string-face */
color: #bc8f8f;
}
.type {
/* font-lock-type-face */
color: #228b22;
}
.variable-name {
/* font-lock-variable-name-face */
color: #b8860b;
}
/* ]] */
/style
pre
span class=keywordclass/span span class=typeAskName/span
span class=keywordextends/span span class=typeCometActor/span {
span class=keyworddef/span span
class=function-namerender/span =
ajaxForm(lt;divgt;What is your username?lt;/divgt; ++
text(span class=string/span,name =gt;
answer(name.trim)) ++
lt;input span class=keywordtype/span=span
class=stringsubmit/span value=span
class=stringEnter/span/gt;)
}
/pre
p
When the user submits the form, the question asked by the Chat comet
widget
is answered with the value the user submitted. This is
similar to the ask/answer paradigm in Seaside, except that there's
no need for continuations.
/p
pNow, onto the heart of the chat app:/p
pre
span class=keywordclass/span span class=typeChat/span span
class=keywordextends/span span class=typeCometActor/span span
class=keywordwith/span span class=typeCometListener/span {
span class=keywordprivate/span span class=keywordvar/span
span class=variable-nameuserName/span = span class=string/span
span class=keywordprivate/span span class=keywordvar/span
span class=variable-namechats/span: span
class=typeList[ChatLine]/span = Nil
span class=keywordprivate/span span class=keywordlazy/span
span class=keywordval/span span class=variable-nameinfoId/span =
uniqueId + span class=string_info/span
span class=keywordprivate/span span class=keywordlazy/span
span class=keywordval/span span class=variable-nameinfoIn/span =
uniqueId + span class=string_in/span
span class=keywordprivate/span span class=keywordlazy/span
span class=keywordval/span span
class=variable-nameinputArea/span = findKids(defaultXml, span
class=stringchat/span, span class=stringinput/span)
span class=keywordprivate/span span class=keywordlazy/span
span class=keywordval/span span class=variable-namebodyArea/span
= findKids(defaultXml, span class=stringchat/span, span
class=stringbody/span)
span class=keywordprivate/span span class=keywordlazy/span
span class=keywordval/span span
class=variable-namesingleLine/span = deepFindKids(bodyArea, span
class=stringchat/span, span class=stringlist/span
[Lift] clue for the clueless?
Lifted, i readily confess to being a total idiot. i'm always running into this problem of not knowing when the namespace binding is in effect. i've cribbed Chat.scala and other files from liftweb/site/example and added it whole sale to my project.When i add val entries = ( Menu(Loc(Home, List(index), Home)) ... :: Menu(Loc(Chat.1, List(chat), Chat, If(User.loggedIn_? _, x))) ... :: User.sitemap ) to my site menu and fire things up i get 'namespace chat undefined'. This is despite override def render = bind(chat, bodyArea, name - userName, AttrBindParam(id, Text(infoId), id), list - displayList _) being defined in the chat class. Any body have a clue for the clueless? Best wishes, --greg -- L.G. Meredith Managing Partner Biosimilarity LLC 1219 NW 83rd St Seattle, WA 98117 +1 206.650.3740 http://biosimilarity.blogspot.com --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups Lift group. To post to this group, send email to liftweb@googlegroups.com To unsubscribe from this group, send email to liftweb+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/liftweb?hl=en -~--~~~~--~~--~--~---
[Lift] Re: Has anyone tried Stax?
Guys, This really seems like a weakness. Can someone walk me through the issues on the lift committers call, tomorrow? Best wishes, --greg On Tue, Aug 18, 2009 at 1:51 PM, Viktor Klang viktor.kl...@gmail.comwrote: On Tue, Aug 18, 2009 at 4:22 PM, marius d. marius.dan...@gmail.comwrote: On Aug 18, 5:05 pm, Naftoli Gugenheim naftoli...@gmail.com wrote: You set whether you want a shared server, or dedicated/various speeds. In any case, is there room to entertain the thought of at some point adding support in Lift to propogate sessions across instances? (Is it easier now that it's been decoupled from servlets?) No it is not easier. The fundamental problem in distributing lift sessions is the bound functions. Sure, functions are serializable but their references may not be. For instance one can bind an ajax anonymous function and that functions can have a bunch of other references inside potentially other lambdas etc. Viktor was doing in the past some research to integrate with Terracotta but there were some issues. So consistently distributing Lift sessions in a clustered environment is a challenge but of course good ideas are more then welcome. Yeah, it really was a can of worms... - Ryan Donahuedonahu...@gmail.com wrote: Is anybody using Stax for anything more than prototyping or examples? If so, what has your experience been? Stax doesn't seem to fit lift very well, but I'd like to find out I'm wrong. Specifically, it does not support sticky sessions: http://developer.stax.net/forum/topics/initial-questions. I assume a Stax app shares resources with others on the same server, so you'd likely need to scale to additional servers sooner than normal. However, the lack of sticky sessions effectively caps a stateful lift app to one server. -- Viktor Klang Rogue Scala-head Blog: klangism.blogspot.com Twttr: viktorklang -- L.G. Meredith Managing Partner Biosimilarity LLC 1219 NW 83rd St Seattle, WA 98117 +1 206.650.3740 http://biosimilarity.blogspot.com --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups Lift group. To post to this group, send email to liftweb@googlegroups.com To unsubscribe from this group, send email to liftweb+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/liftweb?hl=en -~--~~~~--~~--~--~---
[Lift] Re: ws-generated code in lift
Dear David, *This* is a can of night-crawlers. Do you have a specification of the abstract syntax of your flow language? Do you have a semantics? Best wishes, --greg On Mon, Aug 17, 2009 at 10:20 AM, David Pollak feeder.of.the.be...@gmail.com wrote: On Mon, Aug 17, 2009 at 9:25 AM, Derek Chen-Becker dchenbec...@gmail.comwrote: I think that that's a general issue with SOAP, not particular to Lift ;) On Sat, Aug 15, 2009 at 1:04 PM, Timothy Perrett timo...@getintheloop.eu wrote: Id be interested to hear those stories... all the ones i've heard so far that involve anything to do with SOAP have usually been tales of woe ;-) With Goat Rodeo, you can define message flow with an abstract source (input) and sink (output) in the form: Foo % Bar % (Baz * Distribution) You can define fork/join constructs, tee constructs, etc. in the high level flow description. The flow description defines the type-safe progression from each logic unit. The location of each logic unit and the threading/transport model is decided at runtime. This means that you can define logic models and plug in an Akka distribution and threading strategy for production or a single threaded strategy for your local test harness. You'll also be able to register the composed modules that can be composed into larger flows. So, how does this work with SOAP? Well.. the SOAP piece is just a source and sink for the logic flow. Cheers, Tim On Aug 15, 6:47 pm, David Pollak feeder.of.the.be...@gmail.com wrote: I think there will be an important Goat Rodeo/Lift/SOAP story that I'll be able to tell in a week or so... integrating WS into Lift (rather than running on the side) will, I think, have benefits. On Sat, Aug 15, 2009 at 9:45 AM, Timothy Perrett timo...@getintheloop.euwrote: Sounds like a classic situation what is technically possible is one thing but what you should do to preserve your sanity is most probably another ;-) Good luck! Cheers, Tim On Aug 15, 4:29 am, Meredith Gregory lgreg.mered...@gmail.com wrote: Tim, Viktor, Thanks for the insights and sharing of experience. i'm in a situation where i'm working with legacy stuff. i was just wondering how deeply into lift i could push the WSDL-based Java handlers. Best wishes, --greg On Fri, Aug 14, 2009 at 2:54 PM, Timothy Perrett timo...@getintheloop.eu wrote: I agree with Viktor - in a similar vein, this is exactly what I implemented with Akka; the servlet runs in conjunction with lifts filter and lift just hands off stuff it doesnt know what to do with. So if you want to use AxisServlet or whatever its real easy. From my point of view, you'd need a good reason to bring the SOAP stuff into lift; right now i havent found one... I write a lot of lift apps that consume SOAP services, but as yet have no good reason to write a SOAP serving app with lift - If i were to do one, id do exactly as with the JAX-RS stuff in Akka and passNotFoundToChain. Cheers, Tim On Aug 14, 10:24 pm, Viktor Klang viktor.kl...@gmail.com wrote: Gregory, Depending on what WS-* stuff you're using, you _should_ be able to wire the AxisServlet in web.xml under /ws/* or something like that, and then have lift passNotFoundToChain=true But I guess it boils down to what liftiness you're planning to do. Can you elaborate a bit on what you're aiming for? On Fri, Aug 14, 2009 at 9:00 PM, Meredith Gregory lgreg.mered...@gmail.comwrote: Tim, Viktor, Do you wire your SOAP services into lift or do you keep that independent? i was just talking to DPP and according to him it appears you can successfully wire WS-generated code anywhere along in the http-request processing pipeline. He pointed out a gotcha that i think can be circumvented with HttpServletResponse trampoline. Both lift and the WS-generated code are likely to want to be in the driver's seat regarding who's returning the bytes. But, i think you can just fool the WS-generated code into thinking it's got an HttpServletResponse that is really a widget that will just write into the one lift returns. In this way you can write a 1-size-fits-all return adapter. Is this what you guys are doing, or am i making this too complicated? Best wishes, --greg -- L.G. Meredith Managing Partner Biosimilarity LLC 1219 NW 83rd St Seattle, WA 98117 +1 206.650.3740 http://biosimilarity.blogspot.com -- Viktor Klang Rogue Scala-head Blog: klangism.blogspot.com Twttr: viktorklang -- L.G. Meredith Managing Partner Biosimilarity LLC 1219 NW 83rd St
[Lift] Re: ws-generated code in lift
David, Go for it, Dude! Who knows, you might come up with something new. With a Scala encoding as the 'informal spec' i can tell you what semantics are already out there and how yours compares. Best wishes, --greg On Mon, Aug 17, 2009 at 11:19 AM, David Pollak feeder.of.the.be...@gmail.com wrote: On Mon, Aug 17, 2009 at 10:37 AM, Meredith Gregory lgreg.mered...@gmail.com wrote: Dear David, *This* is a can of night-crawlers. Do you have a specification of the abstract syntax of your flow language? Do you have a semantics? No No. Flying by the seat of my pants (as usual). Always happy for pointers to the works of people with bigger brains than me. Best wishes, --greg On Mon, Aug 17, 2009 at 10:20 AM, David Pollak feeder.of.the.be...@gmail.com wrote: On Mon, Aug 17, 2009 at 9:25 AM, Derek Chen-Becker dchenbec...@gmail.com wrote: I think that that's a general issue with SOAP, not particular to Lift ;) On Sat, Aug 15, 2009 at 1:04 PM, Timothy Perrett timo...@getintheloop.eu wrote: Id be interested to hear those stories... all the ones i've heard so far that involve anything to do with SOAP have usually been tales of woe ;-) With Goat Rodeo, you can define message flow with an abstract source (input) and sink (output) in the form: Foo % Bar % (Baz * Distribution) You can define fork/join constructs, tee constructs, etc. in the high level flow description. The flow description defines the type-safe progression from each logic unit. The location of each logic unit and the threading/transport model is decided at runtime. This means that you can define logic models and plug in an Akka distribution and threading strategy for production or a single threaded strategy for your local test harness. You'll also be able to register the composed modules that can be composed into larger flows. So, how does this work with SOAP? Well.. the SOAP piece is just a source and sink for the logic flow. Cheers, Tim On Aug 15, 6:47 pm, David Pollak feeder.of.the.be...@gmail.com wrote: I think there will be an important Goat Rodeo/Lift/SOAP story that I'll be able to tell in a week or so... integrating WS into Lift (rather than running on the side) will, I think, have benefits. On Sat, Aug 15, 2009 at 9:45 AM, Timothy Perrett timo...@getintheloop.euwrote: Sounds like a classic situation what is technically possible is one thing but what you should do to preserve your sanity is most probably another ;-) Good luck! Cheers, Tim On Aug 15, 4:29 am, Meredith Gregory lgreg.mered...@gmail.com wrote: Tim, Viktor, Thanks for the insights and sharing of experience. i'm in a situation where i'm working with legacy stuff. i was just wondering how deeply into lift i could push the WSDL-based Java handlers. Best wishes, --greg On Fri, Aug 14, 2009 at 2:54 PM, Timothy Perrett timo...@getintheloop.eu wrote: I agree with Viktor - in a similar vein, this is exactly what I implemented with Akka; the servlet runs in conjunction with lifts filter and lift just hands off stuff it doesnt know what to do with. So if you want to use AxisServlet or whatever its real easy. From my point of view, you'd need a good reason to bring the SOAP stuff into lift; right now i havent found one... I write a lot of lift apps that consume SOAP services, but as yet have no good reason to write a SOAP serving app with lift - If i were to do one, id do exactly as with the JAX-RS stuff in Akka and passNotFoundToChain. Cheers, Tim On Aug 14, 10:24 pm, Viktor Klang viktor.kl...@gmail.com wrote: Gregory, Depending on what WS-* stuff you're using, you _should_ be able to wire the AxisServlet in web.xml under /ws/* or something like that, and then have lift passNotFoundToChain=true But I guess it boils down to what liftiness you're planning to do. Can you elaborate a bit on what you're aiming for? On Fri, Aug 14, 2009 at 9:00 PM, Meredith Gregory lgreg.mered...@gmail.comwrote: Tim, Viktor, Do you wire your SOAP services into lift or do you keep that independent? i was just talking to DPP and according to him it appears you can successfully wire WS-generated code anywhere along in the http-request processing pipeline. He pointed out a gotcha that i think can be circumvented with HttpServletResponse trampoline. Both lift and the WS-generated code are likely to want to be in the driver's seat regarding who's returning the bytes. But, i think you can just fool the WS-generated code into thinking it's got an HttpServletResponse that is really a widget that will just write into the one lift returns. In this way you can write a 1-size-fits-all return
[Lift] ws-generated code in lift
Tim, Viktor, Do you wire your SOAP services into lift or do you keep that independent? i was just talking to DPP and according to him it appears you can successfully wire WS-generated code anywhere along in the http-request processing pipeline. He pointed out a gotcha that i think can be circumvented with HttpServletResponse trampoline. Both lift and the WS-generated code are likely to want to be in the driver's seat regarding who's returning the bytes. But, i think you can just fool the WS-generated code into thinking it's got an HttpServletResponse that is really a widget that will just write into the one lift returns. In this way you can write a 1-size-fits-all return adapter. Is this what you guys are doing, or am i making this too complicated? Best wishes, --greg -- L.G. Meredith Managing Partner Biosimilarity LLC 1219 NW 83rd St Seattle, WA 98117 +1 206.650.3740 http://biosimilarity.blogspot.com --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups Lift group. To post to this group, send email to liftweb@googlegroups.com To unsubscribe from this group, send email to liftweb+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/liftweb?hl=en -~--~~~~--~~--~--~---
[Lift] Re: [Lift committers] Welcome Joni Freeman to the Lift committers
Joni, Welcome! Best wishes, --greg On Thu, Aug 13, 2009 at 9:06 AM, David Pollak feeder.of.the.be...@gmail.com wrote: Folks, I'm pleased to announce that Joni Freeman has joined the Lift committers. Joni will be adding his high performance JSON library as a module in Lift... and I certainly hope that Lift's JSON support will improve. Please join me in welcoming Joni! Thanks, David -- Lift, the simply functional web framework http://liftweb.net Beginning Scala http://www.apress.com/book/view/1430219890 Follow me: http://twitter.com/dpp Git some: http://github.com/dpp -- L.G. Meredith Managing Partner Biosimilarity LLC 1219 NW 83rd St Seattle, WA 98117 +1 206.650.3740 http://biosimilarity.blogspot.com --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups Lift group. To post to this group, send email to liftweb@googlegroups.com To unsubscribe from this group, send email to liftweb+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/liftweb?hl=en -~--~~~~--~~--~--~---
[Lift] Re: SOAP web services?
All,
As a follow up, i was able to get the Apache Axis2 maven plugin to accept
WSDL 2.0. Below is what i had to add to my pom.xml. Attached is an example
that will get you an Http binding that should work RESTfully.
Best wishes,
--greg
pluginRepositories
...
pluginRepository
idplugin.axis2.apache.org/id
nameApache Axis2 Repository/name
urlhttp://apache.sunsite.ualberta.ca/ws/axis2/tools/1_4_1/url
/pluginRepository
/pluginRepositories
plugins
...
plugin
groupIdorg.apache.axis2/groupId
artifactIdaxis2-wsdl2code-maven-plugin/artifactId
version1.4.1/version
executions
execution
goals
goalwsdl2code/goal
/goals
/execution
/executions
configuration
packageName${groupId}.${artifactId}.model/packageName
wsdlVersion2.0/wsdlVersion
generateAllClassestrue/generateAllClasses
generateServerSidetrue/generateServerSide
generateServerSideInterfacetrue/generateServerSideInterface
generateServicesXmltrue/generateServicesXml
generateTestCasetrue/generateTestCase
/configuration
/plugin
/plugins
2009/8/11 Meredith Gregory lgreg.mered...@gmail.com
Marius,
The original design goals of WSDL were very straightforward:
- a Port Type is a set of Message Types governing all the messages
arriving on the Port
- A Message Type is given precisely by an XML Schema (e.g. an XSD)
- A Port is instanced by binding a Port Type to an Endpoint (URL)
supporting a transport protocol
In symbols, WSDL was intended to be able to make statements of the form
- URL+Transport : { XMLSchema1, ..., XMLSchemaN }
- Notice the close correlation between this and the statement you see
on the Scala REPL all the time:
- ScalaExpr ret
- res1 : ScalaType
URL is the location of the resource/instance in the same way that res1
provides a location that the Scala REPL can use to look up the instance.
PortType is very much like a ScalaType. In the case of typing at the Scala
REPL from a command shell there is no question of transport and any
encoding/decoding necessary. However, if one had a more remote network
access to the Scala REPL that did involve some issues around transport and
encoding/decoding, then these two cases would be isomorphic.
BTW, this lines up nearly perfectly with the idea of sorts and sorting in
Milner's π-calculus.
Because message exchange usually involves parameter-passing because of
confusion about the role of Object Technology in all this, WSDL was
extended with the notion of Operation. This could have been done more
cleanly, but was not. Not everyone involved in WSDL's design had the same
picture in their minds of what they were attempting to accomplish.
As for what happens today, i could easily imaging WSDL and/or WSDL+SOAP
over RabbitMQ, for example. i think something like this is considerably
better than JSON over transport. The basic reason for this is
straightforward. XMLSchema are a form of typing discipline. So, you get a
typing discipline for messaging-style applications that fits well with the
typing discipline of a language like Scala.
This could, for example, play out very nicely in an actor framework. An
actor's mailbox is a good thing to locate at an URL. Then you have
statements of the form
- URL + Transport/Actor : { MessageType1, ..., MessageTypeN }
Today, Scala actors do not even support statements of this basic form,
though they would greatly enhance the actor package.
Beyond this, you can imagine putting constraints on the order of messages.
Here's a general scheme
- Actor : ( { MsgType1 - Type1, ..., MsgTypeN - TypeN },
RegularExpressionOver(MsgType1,...,MsgTypeN) )
- The first element in the pair just maps message type names to Scala
types (or the types of some host language) and the second element in the
pair says the order you expect to see messages in the mailbox.
- Here's an example: ( { Init - OpenSession( id, pwd ), Read -
ReadDb( ... ), Update - UpdateDB( ... ), Finish - CloseSession( ... ) },
Init.(Read+Update)*.Finish )
- It says that the only legal sequences of messages in the mbox are
of the form Init :: Read-or-Update :: ... :: Read-or-Update :: FInish.
Best wishes,
--greg
On Tue, Aug 11, 2009 at 9:27 AM, marius d. marius.dan...@gmail.comwrote:
On Aug 11, 7:09 pm, Meredith Gregory lgreg.mered...@gmail.com wrote:
Tim,
i was under the same impression, but then read a couple of IBM
comparison
articles and a WSO2 blog and it seemed that the WSDL 2.0 was gaining
ground.
Further, the tooling for WSDL, with integration into all the major
IDE's,
has been significantly more developed than the WADL tooling. However,
yesterday i tried a simple example with a schema-valid WSDL 2.0 xml
document
for a simple service with 1 operation and the Apache Axis2 tool barfed
on
the fact that the schema pointed
[Lift] Re: SOAP web services?
Tim, How do you compose JAX-WS generated services with lift or do you? i'm trying to enumerate the ways to do this. Best wishes, --greg On Thu, Aug 6, 2009 at 5:15 PM, Timothy Perrett timo...@getintheloop.euwrote: Myself and Viktor are two committers who do a lot of SOAP work - right now, the best route forward it to use the Java JAX-WS code and call into it with a scala wrapper - this is exactly what I do and it works perfectly. Because there is toll free calling of Java code, there is little point in porting such massive projects to Scala; just make a wrapper that suits your needs. In my environment I have about 40+ endpoints, with hundreds of methods so I just made a scala wrapper that lets me do: DriverManager.whateverdriver.myMethod(params) // Box[T] IMO, that's a damn lot easier than calling a boat load of Java (of course its doing the under the hood, but like I said, its just a wrapper). HTH Cheers, Tim On 06/08/2009 16:26, Jacek Furmankiewicz jace...@gmail.com wrote: I was reading through the Lift book PDF and it mentions only REST- style web services. In our case, we need to look at re-implementing a set of existing SOAP web services (is there anything like 'wsdl2scala' anywhere?). I would appreciate any best practices and suggestions for implementing SOAP web services in the context of a larger Lift app (and Scala in general). -- L.G. Meredith Managing Partner Biosimilarity LLC 1219 NW 83rd St Seattle, WA 98117 +1 206.650.3740 http://biosimilarity.blogspot.com --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups Lift group. To post to this group, send email to liftweb@googlegroups.com To unsubscribe from this group, send email to liftweb+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/liftweb?hl=en -~--~~~~--~~--~--~---
[Lift] Re: SOAP web services?
Tim, i was under the same impression, but then read a couple of IBM comparison articles and a WSO2 blog and it seemed that the WSDL 2.0 was gaining ground. Further, the tooling for WSDL, with integration into all the major IDE's, has been significantly more developed than the WADL tooling. However, yesterday i tried a simple example with a schema-valid WSDL 2.0 xml document for a simple service with 1 operation and the Apache Axis2 tool barfed on the fact that the schema pointed to in the document was for WSDL 2.0 and not WSDL 1.1 -- despite the fact that they claim on their home page to support WSDL 2.0. For the record, WSDL -- as much as i hate it -- was not meant to be tied to a transport. As a matter of fact, neither was SOAP. You should be able to effect these over any transport, HTTP included, and presumably in more than one way. WADL is tied to HTTP. This means its scope is considerably more limited. Best wishes, --greg On Tue, Aug 11, 2009 at 12:55 AM, Timothy Perrett timo...@getintheloop.euwrote: Hey Greg, Im not sure about WSDL2.0, but my understanding was that WADL ( https://wadl.dev.java.net/ ) was making the most ground in the REST service description arena. Cheers, Tim On Aug 10, 10:58 pm, Meredith Gregory lgreg.mered...@gmail.com wrote: Lifted RESTafarians, Has anyone tried the Apache Axis 2 WSDL 2.0 support? i'm looking at this page http://ws.apache.org/axis2/tools/1_2/maven-plugins/maven-wsdl2code-pl.. .and it claims they have a maven plugin to generate the stubs for a WSDL 2.0 REST binding. i'm going to play around with it to wrap BNF Converter in a RESTful service; but, i was wondering if anyone else had experience with it. Best wishes, --greg On Fri, Aug 7, 2009 at 12:31 AM, Viktor Klang viktor.kl...@gmail.com wrote: Hello Jacek, actually, if I were you I'd consider implementing your webservices as REST services and then just have your SOAP stubs call your rest services. (If you're not using anything voodooesque) Then you have the benefit of using the existing plumbing as much as possible, while still maintaining your SOAP interface as well as a potential migration path to something non-WSDL. (I am severely biased by having to work with SOAP, which has scarred me for life) On Thu, Aug 6, 2009 at 5:26 PM, Jacek Furmankiewicz jace...@gmail.com wrote: I was reading through the Lift book PDF and it mentions only REST- style web services. In our case, we need to look at re-implementing a set of existing SOAP web services (is there anything like 'wsdl2scala' anywhere?). I would appreciate any best practices and suggestions for implementing SOAP web services in the context of a larger Lift app (and Scala in general). -- Viktor Klang Rogue Scala-head Blog: klangism.blogspot.com Twttr: viktorklang -- L.G. Meredith Managing Partner Biosimilarity LLC 1219 NW 83rd St Seattle, WA 98117 +1 206.650.3740 http://biosimilarity.blogspot.com -- L.G. Meredith Managing Partner Biosimilarity LLC 1219 NW 83rd St Seattle, WA 98117 +1 206.650.3740 http://biosimilarity.blogspot.com --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups Lift group. To post to this group, send email to liftweb@googlegroups.com To unsubscribe from this group, send email to liftweb+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/liftweb?hl=en -~--~~~~--~~--~--~---
[Lift] Re: SOAP web services?
Marius,
The original design goals of WSDL were very straightforward:
- a Port Type is a set of Message Types governing all the messages
arriving on the Port
- A Message Type is given precisely by an XML Schema (e.g. an XSD)
- A Port is instanced by binding a Port Type to an Endpoint (URL)
supporting a transport protocol
In symbols, WSDL was intended to be able to make statements of the form
- URL+Transport : { XMLSchema1, ..., XMLSchemaN }
- Notice the close correlation between this and the statement you see on
the Scala REPL all the time:
- ScalaExpr ret
- res1 : ScalaType
URL is the location of the resource/instance in the same way that res1
provides a location that the Scala REPL can use to look up the instance.
PortType is very much like a ScalaType. In the case of typing at the Scala
REPL from a command shell there is no question of transport and any
encoding/decoding necessary. However, if one had a more remote network
access to the Scala REPL that did involve some issues around transport and
encoding/decoding, then these two cases would be isomorphic.
BTW, this lines up nearly perfectly with the idea of sorts and sorting in
Milner's π-calculus.
Because message exchange usually involves parameter-passing because of
confusion about the role of Object Technology in all this, WSDL was
extended with the notion of Operation. This could have been done more
cleanly, but was not. Not everyone involved in WSDL's design had the same
picture in their minds of what they were attempting to accomplish.
As for what happens today, i could easily imaging WSDL and/or WSDL+SOAP over
RabbitMQ, for example. i think something like this is considerably better
than JSON over transport. The basic reason for this is straightforward.
XMLSchema are a form of typing discipline. So, you get a typing discipline
for messaging-style applications that fits well with the typing discipline
of a language like Scala.
This could, for example, play out very nicely in an actor framework. An
actor's mailbox is a good thing to locate at an URL. Then you have
statements of the form
- URL + Transport/Actor : { MessageType1, ..., MessageTypeN }
Today, Scala actors do not even support statements of this basic form,
though they would greatly enhance the actor package.
Beyond this, you can imagine putting constraints on the order of messages.
Here's a general scheme
- Actor : ( { MsgType1 - Type1, ..., MsgTypeN - TypeN },
RegularExpressionOver(MsgType1,...,MsgTypeN) )
- The first element in the pair just maps message type names to Scala
types (or the types of some host language) and the second element in the
pair says the order you expect to see messages in the mailbox.
- Here's an example: ( { Init - OpenSession( id, pwd ), Read - ReadDb(
... ), Update - UpdateDB( ... ), Finish - CloseSession( ... ) },
Init.(Read+Update)*.Finish )
- It says that the only legal sequences of messages in the mbox are of
the form Init :: Read-or-Update :: ... :: Read-or-Update :: FInish.
Best wishes,
--greg
On Tue, Aug 11, 2009 at 9:27 AM, marius d. marius.dan...@gmail.com wrote:
On Aug 11, 7:09 pm, Meredith Gregory lgreg.mered...@gmail.com wrote:
Tim,
i was under the same impression, but then read a couple of IBM comparison
articles and a WSO2 blog and it seemed that the WSDL 2.0 was gaining
ground.
Further, the tooling for WSDL, with integration into all the major IDE's,
has been significantly more developed than the WADL tooling. However,
yesterday i tried a simple example with a schema-valid WSDL 2.0 xml
document
for a simple service with 1 operation and the Apache Axis2 tool barfed on
the fact that the schema pointed to in the document was for WSDL 2.0 and
not
WSDL 1.1 -- despite the fact that they claim on their home page to
support
WSDL 2.0.
For the record, WSDL -- as much as i hate it -- was not meant to be tied
to
a transport. As a matter of fact, neither was SOAP. You should be able to
effect these over any transport, HTTP included, and presumably in more
than
one way. WADL is tied to HTTP. This means its scope is considerably more
limited.
Very true. But then again in reality how often are we seeing WSDL/SOAP
bound to something else then HTTP? ... in some respects this seems a
false selling point of SOAP.
Assuming an enterprise application where let's say we can escape HTTP
realm, probably RMI/IIOP, JINI, JXTA etc. even proprietary on the wire
representation etc.becomes valid choices.
Best wishes,
--greg
On Tue, Aug 11, 2009 at 12:55 AM, Timothy Perrett
timo...@getintheloop.euwrote:
Hey Greg,
Im not sure about WSDL2.0, but my understanding was that WADL
(https://wadl.dev.java.net/) was making the most ground in the REST
service description arena.
Cheers, Tim
On Aug 10, 10:58 pm, Meredith Gregory lgreg.mered...@gmail.com
wrote:
Lifted RESTafarians,
Has
[Lift] Re: SOAP web services?
Lifted RESTafarians, Has anyone tried the Apache Axis 2 WSDL 2.0 support? i'm looking at this pagehttp://ws.apache.org/axis2/tools/1_2/maven-plugins/maven-wsdl2code-plugin.htmland it claims they have a maven plugin to generate the stubs for a WSDL 2.0 REST binding. i'm going to play around with it to wrap BNF Converter in a RESTful service; but, i was wondering if anyone else had experience with it. Best wishes, --greg On Fri, Aug 7, 2009 at 12:31 AM, Viktor Klang viktor.kl...@gmail.comwrote: Hello Jacek, actually, if I were you I'd consider implementing your webservices as REST services and then just have your SOAP stubs call your rest services. (If you're not using anything voodooesque) Then you have the benefit of using the existing plumbing as much as possible, while still maintaining your SOAP interface as well as a potential migration path to something non-WSDL. (I am severely biased by having to work with SOAP, which has scarred me for life) On Thu, Aug 6, 2009 at 5:26 PM, Jacek Furmankiewicz jace...@gmail.comwrote: I was reading through the Lift book PDF and it mentions only REST- style web services. In our case, we need to look at re-implementing a set of existing SOAP web services (is there anything like 'wsdl2scala' anywhere?). I would appreciate any best practices and suggestions for implementing SOAP web services in the context of a larger Lift app (and Scala in general). -- Viktor Klang Rogue Scala-head Blog: klangism.blogspot.com Twttr: viktorklang -- L.G. Meredith Managing Partner Biosimilarity LLC 1219 NW 83rd St Seattle, WA 98117 +1 206.650.3740 http://biosimilarity.blogspot.com --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups Lift group. To post to this group, send email to liftweb@googlegroups.com To unsubscribe from this group, send email to liftweb+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/liftweb?hl=en -~--~~~~--~~--~--~---
[Lift] location for chat sample source?
Lifted, Is the chat sample in github somewhere? Best wishes, --greg -- L.G. Meredith Managing Partner Biosimilarity LLC 1219 NW 83rd St Seattle, WA 98117 +1 206.650.3740 http://biosimilarity.blogspot.com --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups Lift group. To post to this group, send email to liftweb@googlegroups.com To unsubscribe from this group, send email to liftweb+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/liftweb?hl=en -~--~~~~--~~--~--~---
[Lift] Re: location for chat sample source?
David, Cheers! Best wishes, --greg On Mon, Aug 3, 2009 at 1:53 PM, David Pollak feeder.of.the.be...@gmail.comwrote: sites/example/src/main/scala/net/liftweb/example/comet/Chat.scala On Mon, Aug 3, 2009 at 1:12 PM, Meredith Gregory lgreg.mered...@gmail.com wrote: Lifted, Is the chat sample in github somewhere? Best wishes, --greg -- L.G. Meredith Managing Partner Biosimilarity LLC 1219 NW 83rd St Seattle, WA 98117 +1 206.650.3740 http://biosimilarity.blogspot.com -- Lift, the simply functional web framework http://liftweb.net Beginning Scala http://www.apress.com/book/view/1430219890 Follow me: http://twitter.com/dpp Git some: http://github.com/dpp -- L.G. Meredith Managing Partner Biosimilarity LLC 1219 NW 83rd St Seattle, WA 98117 +1 206.650.3740 http://biosimilarity.blogspot.com --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups Lift group. To post to this group, send email to liftweb@googlegroups.com To unsubscribe from this group, send email to liftweb+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/liftweb?hl=en -~--~~~~--~~--~--~---
[Lift] Re: HadoopDB
Viktor, Yes. For example, in the biotech case the data is coming in from a device-based origin. Best wishes, --greg On Thu, Jul 23, 2009 at 2:35 AM, Viktor Klang viktor.kl...@gmail.comwrote: On Wed, Jul 22, 2009 at 11:52 PM, Meredith Gregory lgreg.mered...@gmail.com wrote: Alex, Viktor, i think write semantics could get complicated quickly, actually. However, i was initially responding to the idea that trad business object models don't give way to analytics. Being able to make read-only queries against large volumes of data using the original business object schema seems to me like a win -- even if it's only used to populate a db that's sliced up in a different way for further analytics processing. So basically, what's needed on top of HadoopDB is a service that updates data as needed from external data sources. Best wishes, --greg On Wed, Jul 22, 2009 at 2:44 PM, Alex Cruise a...@cluonflux.com wrote: Viktor Klang wrote: Absolutely, perhaps I'm tainted by write-heavy systems and perhaps I'm just failing to see the overhead we're talking about. Perhaps I overlooked it, but the paper didn't mention performance for small writes and potentially multiple nodespanning transactions. HadoopDB makes no claim to any support for writes at all, I'm just speculating that It Should Be Possible given my understanding of its architecture, which is admittedly limited and based solely on reading the paper and a bit of the code. :) I'm inclined to believe that some sort of immutable records storage would simlify the semantics (analytic queries are IMHO very seldom demanding real-time snapshots) Analytical queries against static data are exactly what it's for. I have no experience with its competition, namely parallel/distributed column-oriented databases, so I can't say whether they're any happier with writes. FYI I brought up HadoopDB on the NoSQL list too but so far not too many takers... -0xe1a -- L.G. Meredith Managing Partner Biosimilarity LLC 1219 NW 83rd St Seattle, WA 98117 +1 206.650.3740 http://biosimilarity.blogspot.com -- Viktor Klang Rogue Scala-head Twttr: viktorklang -- L.G. Meredith Managing Partner Biosimilarity LLC 1219 NW 83rd St Seattle, WA 98117 +1 206.650.3740 http://biosimilarity.blogspot.com --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups Lift group. To post to this group, send email to liftweb@googlegroups.com To unsubscribe from this group, send email to liftweb+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/liftweb?hl=en -~--~~~~--~~--~--~---
[Lift] Re: HadoopDB
Viktor, Yep. Best wishes, --greg On Thu, Jul 23, 2009 at 10:08 AM, Viktor Klang viktor.kl...@gmail.comwrote: On Thu, Jul 23, 2009 at 6:46 PM, Meredith Gregory lgreg.mered...@gmail.com wrote: Viktor, Yes. For example, in the biotech case the data is coming in from a device-based origin. This is interesting. Analyzing the AST of the query for the data, then identify the different data sources and then query each for all relevant data since last refresh, then push that into partitions and then schedule the Jobs and execute SQL and then merge/reduce the results. Best wishes, --greg On Thu, Jul 23, 2009 at 2:35 AM, Viktor Klang viktor.kl...@gmail.comwrote: On Wed, Jul 22, 2009 at 11:52 PM, Meredith Gregory lgreg.mered...@gmail.com wrote: Alex, Viktor, i think write semantics could get complicated quickly, actually. However, i was initially responding to the idea that trad business object models don't give way to analytics. Being able to make read-only queries against large volumes of data using the original business object schema seems to me like a win -- even if it's only used to populate a db that's sliced up in a different way for further analytics processing. So basically, what's needed on top of HadoopDB is a service that updates data as needed from external data sources. Best wishes, --greg On Wed, Jul 22, 2009 at 2:44 PM, Alex Cruise a...@cluonflux.comwrote: Viktor Klang wrote: Absolutely, perhaps I'm tainted by write-heavy systems and perhaps I'm just failing to see the overhead we're talking about. Perhaps I overlooked it, but the paper didn't mention performance for small writes and potentially multiple nodespanning transactions. HadoopDB makes no claim to any support for writes at all, I'm just speculating that It Should Be Possible given my understanding of its architecture, which is admittedly limited and based solely on reading the paper and a bit of the code. :) I'm inclined to believe that some sort of immutable records storage would simlify the semantics (analytic queries are IMHO very seldom demanding real-time snapshots) Analytical queries against static data are exactly what it's for. I have no experience with its competition, namely parallel/distributed column-oriented databases, so I can't say whether they're any happier with writes. FYI I brought up HadoopDB on the NoSQL list too but so far not too many takers... -0xe1a -- L.G. Meredith Managing Partner Biosimilarity LLC 1219 NW 83rd St Seattle, WA 98117 +1 206.650.3740 http://biosimilarity.blogspot.com -- Viktor Klang Rogue Scala-head Twttr: viktorklang -- L.G. Meredith Managing Partner Biosimilarity LLC 1219 NW 83rd St Seattle, WA 98117 +1 206.650.3740 http://biosimilarity.blogspot.com -- Viktor Klang Rogue Scala-head Twttr: viktorklang -- L.G. Meredith Managing Partner Biosimilarity LLC 1219 NW 83rd St Seattle, WA 98117 +1 206.650.3740 http://biosimilarity.blogspot.com --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups Lift group. To post to this group, send email to liftweb@googlegroups.com To unsubscribe from this group, send email to liftweb+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/liftweb?hl=en -~--~~~~--~~--~--~---
[Lift] Re: HadoopDB
Viktor, Your comment is intriguing to me. As near as i can tell the Web 2.0 trend has this effect that what started out as a traditional domain/business object model scales out to the point where it starts to look a lot like an analytics db -- especially when you're trawling for patterns, trends and other marketing-like data. As for my little project, i think it's a perfect match for DSLs that cover analytic set ups like i see in biology and computational finance. Best wishes, --greg On Wed, Jul 22, 2009 at 12:03 PM, Viktor Klang viktor.kl...@gmail.comwrote: On Wed, Jul 22, 2009 at 8:05 PM, Alex Cruise a...@cluonflux.com wrote: Viktor Klang wrote: Read it earlier today. It's quite interesting, transcoding SQL to MapReduce jobs that uses RDBMes as datasources I see this really useful for analytical querying over huge datasets, but I wouldn't imagine it as an option as persistence-store for domain/business objects. Definitely not yet, but their approach *should* be amenable to read-mostly/some-writes use cases in that it tries to discover which node(s) hold the data that will be affected by analyzing the SQL AST; distributed transactions are awful but at least they can be contained to a subset of DBMS nodes. I'm also interested in the possibility to use other/develop new query languages that can use the same mechanics. Gregory: Do you see Project Stockholm benefitting from this? -0xe1a -- Viktor Klang Rogue Scala-head Twttr: viktorklang -- L.G. Meredith Managing Partner Biosimilarity LLC 1219 NW 83rd St Seattle, WA 98117 +1 206.650.3740 http://biosimilarity.blogspot.com --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups Lift group. To post to this group, send email to liftweb@googlegroups.com To unsubscribe from this group, send email to liftweb+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/liftweb?hl=en -~--~~~~--~~--~--~---
[Lift] Re: HadoopDB
Alex, Viktor, i think write semantics could get complicated quickly, actually. However, i was initially responding to the idea that trad business object models don't give way to analytics. Being able to make read-only queries against large volumes of data using the original business object schema seems to me like a win -- even if it's only used to populate a db that's sliced up in a different way for further analytics processing. Best wishes, --greg On Wed, Jul 22, 2009 at 2:44 PM, Alex Cruise a...@cluonflux.com wrote: Viktor Klang wrote: Absolutely, perhaps I'm tainted by write-heavy systems and perhaps I'm just failing to see the overhead we're talking about. Perhaps I overlooked it, but the paper didn't mention performance for small writes and potentially multiple nodespanning transactions. HadoopDB makes no claim to any support for writes at all, I'm just speculating that It Should Be Possible given my understanding of its architecture, which is admittedly limited and based solely on reading the paper and a bit of the code. :) I'm inclined to believe that some sort of immutable records storage would simlify the semantics (analytic queries are IMHO very seldom demanding real-time snapshots) Analytical queries against static data are exactly what it's for. I have no experience with its competition, namely parallel/distributed column-oriented databases, so I can't say whether they're any happier with writes. FYI I brought up HadoopDB on the NoSQL list too but so far not too many takers... -0xe1a -- L.G. Meredith Managing Partner Biosimilarity LLC 1219 NW 83rd St Seattle, WA 98117 +1 206.650.3740 http://biosimilarity.blogspot.com --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups Lift group. To post to this group, send email to liftweb@googlegroups.com To unsubscribe from this group, send email to liftweb+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/liftweb?hl=en -~--~~~~--~~--~--~---
[Lift] Re: Feedback on presentation
Derek, Any chance you could rent a time machine and give me these slides back in 2007 when i was first working out how to build a lift app? Nice work. Best wishes, --greg On Mon, Jul 20, 2009 at 3:22 PM, Timothy Perrett timo...@getintheloop.euwrote: +1 it looks really good mate. Presumably your doing a live demo at the start or similar? Cheers, Tim Sent from my iPhone On 20 Jul 2009, at 23:09, David Pollak feeder.of.the.be...@gmail.com wrote: Looks good to me. On Mon, Jul 20, 2009 at 3:05 PM, Derek Chen-Becker dchenbec...@gmail.com dchenbec...@gmail.com wrote: I've attached the slides that I'll be using for my talk to the Boulder JUG in August. It's mainly cribbed from the excellent presentations that other people here have made, but I would appreciate any feedback on content or structure. Thanks, Derek -- Lift, the simply functional web framework http://liftweb.net http://liftweb.net Beginning Scala http://www.apress.com/book/view/1430219890 http://www.apress.com/book/view/1430219890 Follow me: http://twitter.com/dpphttp://twitter.com/dpp Git some: http://github.com/dpphttp://github.com/dpp -- L.G. Meredith Managing Partner Biosimilarity LLC 1219 NW 83rd St Seattle, WA 98117 +1 206.650.3740 http://biosimilarity.blogspot.com --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups Lift group. To post to this group, send email to liftweb@googlegroups.com To unsubscribe from this group, send email to liftweb+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/liftweb?hl=en -~--~~~~--~~--~--~---
Re: [scala] Re: [Lift] Re: Jersey + Lift, whats the story?
David,
Thanks for your query. Here's an example from Hinze and Jeuring's
paperhttp://www.informatik.uni-bonn.de/%7Eralf/publications/TheWeb.ps.gz,
the syntax is Haskell(ish), but it's also simple enough to transliterate to
Scala.
rhs = Abs n (If (App (App (Var =) (Var n)) (Var 0))
(Var 1)
(App (App (Var +) (Var n))
(App (Var fac) (App (Var pred) (Var
n)
This is the body of a factorial calculation that has a typo in it. It should
have a (Var *) where there is a (Var +). We'd like to navigate to that
location. Using a zipper our navigation would look like
top rhs
Abs n (If (App ... ) )
down $$
If (App (App ...) )
down $$
App (App (Var ...) )
right $$
Var 1
right $$
App (App (Var +) (Var n)) (App (Var fac) ...)
down $$
App (Var +) (Var n)
down $$
Var +
$${ it = (Var *) }
Var *
up $$
App (Var *) (Var n)
Let me know if this helps.
Best wishes,
--greg
On Sat, Jul 18, 2009 at 4:38 PM, David Pollak feeder.of.the.be...@gmail.com
wrote:
Greg,
This sounds interesting... but I'd like to see what the Scala code would
look like that would manipulate the Zipper-based data structures. If you've
got a pile of XML, what does it look like to map it to nested [case]
classes? What does it look like to manipulate the XML?
Thanks,
David
On Fri, Jul 17, 2009 at 10:54 AM, Meredith Gregory
lgreg.mered...@gmail.com wrote:
Guys,
After playing around with integrating Lift and Jersey before the Jersey
guys did an 'official' integration and thinking hard about how i wanted to
reference locations in data structures via URLs, i realized that
zipperhttp://en.wikipedia.org/wiki/Zipper_%28data_structure%29(cf. this
explanation http://www.haskell.org/haskellwiki/Zipper) is a much
better, much more functional, generic and maintainable solution.
Briefly, the way this works is to automate the calculation of a context
type, C(T), from a data type T. The context type will allow for the
representation of locations in an instance of T in terms of contexts and
holes. There's a natural way to get from contexts to paths. So, there's a
natural map from URLs (viewed as paths) to locations. One great example of
how this works in practice is Oleg Kiselyov's Zipper-based file system. The
analogy between paths to files and URLs to resources should be clear.
This has led me to look at where to cut the line on calculating zippers.
As the wikipedia article mentions above, it is possible do this completely
generically, provided one has a notion of differentiation on data
structures; that is, the zipper can be expressed in terms of the derivative
of a data structure. There are two natural (and somewhat competing) places
to hang the differentiation calculation:
- the new collections library for scala
- the target of a mapping from one of the XML schema proposals to
scala types
Jorge and i were chatting about this the other day. Either route is a bit
of a large task and i've got a bunch of other stuff on my plate right now.
However, i'd be very happy to collaborate with anyone who wants to make this
happen. Also, by the way, this works really well with a lot of other
monadically based machinery.
Best wishes,
--greg
On Fri, Jul 17, 2009 at 8:17 AM, TylerWeir tyler.w...@gmail.com wrote:
Wait a few days, and I think there'll be some very good news on this
front.
Tease! :)
On Jul 17, 10:51 am, David Pollak feeder.of.the.be...@gmail.com
wrote:
There are benefits to both approaches. I prefer the partial function
composition, but annotations on Pojos have their place.
Wait a few days, and I think there'll be some very good news on this
front.
On Fri, Jul 17, 2009 at 7:28 AM, Timothy Perrett
timo...@getintheloop.euwrote:
Hey guys,
I've been taking a look at Jersey and how it operates with Lift by
way
of the recent integration that cropped up on dev.java.net...
From my perspective, I see how having a standard RS service framework
could be helpful, but it appears to bypass important lift concepts
like SiteMap etc so I'm just wondering what the benefit of using such
a layer would be over using DispatchPF etc to create REST services or
serving xml fragments for templates? (I have no idea about Jersey
apart from the basic docs ive read, so if im missing a major benefit
id love to hear discuss)
Cheers for any thoughts
Tim
--
Lift, the simply functional web frameworkhttp://liftweb.net
Beginning Scalahttp://www.apress.com/book/view/1430219890
Follow me:http://twitter.com/dpp
Git some:http://github.com/dpp
--
L.G. Meredith
Managing Partner
Biosimilarity LLC
1219 NW 83rd St
Seattle, WA 98117
+1 206.650.3740
http://biosimilarity.blogspot.com
--
Lift, the simply functional web framework http://liftweb.net
Beginning Scala http://www.apress.com/book/view/1430219890
Follow me: http://twitter.com/dpp
Git
[Lift] Re: Jersey + Lift, whats the story?
Guys, After playing around with integrating Lift and Jersey before the Jersey guys did an 'official' integration and thinking hard about how i wanted to reference locations in data structures via URLs, i realized that zipperhttp://en.wikipedia.org/wiki/Zipper_%28data_structure%29(cf. this explanation http://www.haskell.org/haskellwiki/Zipper) is a much better, much more functional, generic and maintainable solution. Briefly, the way this works is to automate the calculation of a context type, C(T), from a data type T. The context type will allow for the representation of locations in an instance of T in terms of contexts and holes. There's a natural way to get from contexts to paths. So, there's a natural map from URLs (viewed as paths) to locations. One great example of how this works in practice is Oleg Kiselyov's Zipper-based file system. The analogy between paths to files and URLs to resources should be clear. This has led me to look at where to cut the line on calculating zippers. As the wikipedia article mentions above, it is possible do this completely generically, provided one has a notion of differentiation on data structures; that is, the zipper can be expressed in terms of the derivative of a data structure. There are two natural (and somewhat competing) places to hang the differentiation calculation: - the new collections library for scala - the target of a mapping from one of the XML schema proposals to scala types Jorge and i were chatting about this the other day. Either route is a bit of a large task and i've got a bunch of other stuff on my plate right now. However, i'd be very happy to collaborate with anyone who wants to make this happen. Also, by the way, this works really well with a lot of other monadically based machinery. Best wishes, --greg On Fri, Jul 17, 2009 at 8:17 AM, TylerWeir tyler.w...@gmail.com wrote: Wait a few days, and I think there'll be some very good news on this front. Tease! :) On Jul 17, 10:51 am, David Pollak feeder.of.the.be...@gmail.com wrote: There are benefits to both approaches. I prefer the partial function composition, but annotations on Pojos have their place. Wait a few days, and I think there'll be some very good news on this front. On Fri, Jul 17, 2009 at 7:28 AM, Timothy Perrett timo...@getintheloop.eu wrote: Hey guys, I've been taking a look at Jersey and how it operates with Lift by way of the recent integration that cropped up on dev.java.net... From my perspective, I see how having a standard RS service framework could be helpful, but it appears to bypass important lift concepts like SiteMap etc so I'm just wondering what the benefit of using such a layer would be over using DispatchPF etc to create REST services or serving xml fragments for templates? (I have no idea about Jersey apart from the basic docs ive read, so if im missing a major benefit id love to hear discuss) Cheers for any thoughts Tim -- Lift, the simply functional web frameworkhttp://liftweb.net Beginning Scalahttp://www.apress.com/book/view/1430219890 Follow me:http://twitter.com/dpp Git some:http://github.com/dpp -- L.G. Meredith Managing Partner Biosimilarity LLC 1219 NW 83rd St Seattle, WA 98117 +1 206.650.3740 http://biosimilarity.blogspot.com --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups Lift group. To post to this group, send email to liftweb@googlegroups.com To unsubscribe from this group, send email to liftweb+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/liftweb?hl=en -~--~~~~--~~--~--~---
[Lift] Re: JTA Transaction Monad - Early Access Program
Jonas, i'm going to begin playing with it after i've finished the conversion of the DSL stuff to scala-query. The JTA monad should just fit with scala-query. Best wishes, --greg On Tue, Jul 7, 2009 at 10:18 AM, Jonas Bonér jbo...@gmail.com wrote: No I haven't. Should I? Is everyone happy with it? Have anyone tried it? Is anyone using it? 2009/6/30 Timothy Perrett timo...@getintheloop.eu: Jonas, Did you roll this into master? What's its status? Cheers, Tim On Jun 10, 4:46 pm, James Strachan james.strac...@gmail.com wrote: 2009/6/9 Jonas Bonér jbo...@gmail.com: 2009/6/9 David Pollak feeder.of.the.be...@gmail.com: Jonas, We always use Maven to load dependencies. We never use GPL dependencies. If you have a question about the license of a dependency and its use in Lift, please ping me privately. I am using Maven. But as I said I could not find the Atomikos in any public library, putting them in lib will let the user easily install them in their local repo. Do you know if they are in any public repo? If its any help I added them here a while back for an integration test in ActiveMQhttp://repo.fusesource.com/maven2-all/com/atomikos/ the repo is:http://repo.fusesource.com/maven2-all/ you might wanna put more recent jars up on some public repo though. -- James ---http://macstrac.blogspot.com/ Open Source Integrationhttp://fusesource.com/ -- Jonas Bonér twitter: @jboner blog:http://jonasboner.com work: http://crisp.se work: http://scalablesolutions.se code: http://github.com/jboner -- L.G. Meredith Managing Partner Biosimilarity LLC 1219 NW 83rd St Seattle, WA 98117 +1 206.650.3740 http://biosimilarity.blogspot.com --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups Lift group. To post to this group, send email to liftweb@googlegroups.com To unsubscribe from this group, send email to liftweb+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/liftweb?hl=en -~--~~~~--~~--~--~---
[Lift] organizing views of synchronous streams
All, Here's a blog posthttp://biosimilarity.blogspot.com/2009/07/scores-and-comics-and-views-of.htmloutlining a way to organize synchronous streams of information. i post it here to get an opinion regarding how much work you all think it might be to do in lift. Best wishes, --greg -- L.G. Meredith Managing Partner Biosimilarity LLC 1219 NW 83rd St Seattle, WA 98117 +1 206.650.3740 http://biosimilarity.blogspot.com --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups Lift group. To post to this group, send email to liftweb@googlegroups.com To unsubscribe from this group, send email to liftweb+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/liftweb?hl=en -~--~~~~--~~--~--~---
[Lift] Re: [scala] Re: higher-kinded types
Adriaan,
i believe the examples below indicate that Scala's type-checker agrees with
me that your proposed correction for my encoding allows for potential
loosening of A-ness. See the example below.
In English, in a monad C over A we don't want to encounter some other type
besides A's. We see the problem when we insist that A's have some property,
like being at least Option'ed.
Best wishes,
--greg
// smallest expression of monad i can find
trait MBrace[C[X] : MBrace[C,X],A] {
def nest( a : A ) : C[A]
def flatten[T : C[C[A]]]( bsq : T ) : C[A]
}
// a monad that is a Seq
trait MBraceSeq[C[X] : MBrace[C,X] with Seq[X],A] extends MBrace[C,A]
// This is fine
abstract class MLink[A]( a : Option[A], na : Option[MLink[A]] ) extends
Seq[A] with MBrace[MLink,A]
// But this is not
//abstract class MLink[A : Option[_]]( a : Option[A], na : Option[MLink[A]]
) extends Seq[A] with MBrace[MLink,A]
The complaint is exactly in line with my concern:
scala console:6: error: the kinds of the type arguments (MLink,A) do not
conform to the expected kinds of the type parameters (type C,type A) in
trait MBrace.
MLink's type parameters do not match type C's expected parameters: type A's
bounds : Nothing : Option[_] are stricter than type X's declared bounds :
Nothing : Any
abstract class MLink[A : Option[_]]( a : Option[A], na :
Option[MLink[A]] ) extends Seq[A] with MBrace[MLink,A]
On Fri, Jun 26, 2009 at 10:24 AM, Meredith Gregory lgreg.mered...@gmail.com
wrote:
Adriaan,
First of all, thanks for the time and thought you put into this. i'm not
happy with your interpretation. i cannot convince myself that refinements
might not relax the A-ness (apologies for the awful sfunctor of a pun
hiding here ;-) of the contained element. More importantly, the bug is a bug
regardless of whether my encoding has the semantics i want. The compiler is
complaining that type bounds are not met that to my eyes plainly are --
unless you can convince me otherwise. For example, if you can give me the
interpretation into the appropriate type calculus of the situation i
reported, i will do the calculation myself.
Best wishes,
--greg
On Fri, Jun 26, 2009 at 2:35 AM, Adriaan Moors
adriaan.mo...@cs.kuleuven.be wrote:
Hi,
I think you meant to write
trait MBrace[C[X] : MBrace[C,X], A]
instead of
trait MBrace[C[_] : MBrace[C,A], A]
(see also ticket 2096 http://lampsvn.epfl.ch/trac/scala/ticket/2096)
We only used type members in our (OOPSLA) paper
to hide some of the higher-kinded types away for backward compatibility.
I would not advocate encoding type constructors using something like your
TypeCtor1 trait, as the encoding makes typekind checking less precise, and
you'll lose type inference (type constructor inference should be coming to
2.8.x, btw).
cheers
adriaan
On Thu, Jun 25, 2009 at 8:47 AM, Meredith Gregory
lgreg.mered...@gmail.com wrote:
All,
The following code works without going through the M-P-O construction. It
enjoys approximately the same brevity as a Haskell type class.
// smallest expression of monad i can find
trait MBrace[C[_] : MBrace[C,A],A] {
def nest( a : A ) : C[A]
def flatten[T : C[C[A]]]( bsq : T ) : C[A]
}
// one of the simplest witnesses of monad i can find
class MBraceSeq[A]( a_ : A* ) extends Seq[A] with MBrace[MBraceSeq,A] {
override def nest( a : A ) = new MBraceSeq[A]( a )
override def flatten[T : MBraceSeq[MBraceSeq[A]]]( bsq : T ) :
MBraceSeq[A] = {
(new MBraceSeq[A]( ) /: bsq)( {
( acc : MBraceSeq[A], e : MBraceSeq[A] ) = ( acc ++ e
).asInstanceOf[MBraceSeq[A]]
} )
}
override def length = a_.length
override def elements = a_.elements
override def apply( n : Int ) = a_.apply( n )
}
Best wishes,
--greg
On Wed, Jun 24, 2009 at 3:49 PM, Meredith Gregory
lgreg.mered...@gmail.com wrote:
All,
Am i correct in concluding that the solution in The
Moors-Piessens-Odersky paper only works with collections that have been
clever enough to have used type members rather that type parameters? Or, is
there a trick to making the vast majority of the collections types that are
parametrically typed look as if they have type members? (See example
below.)
Best wishes,
--greg
// Paraphrasing the basic Moors-Piessens-Odersky construction
trait TypeCtor1 { type E }
trait Brace[A] extends TypeCtor1 {
type C : TypeCtor1
def nest( a : A ) : C{type E = A}
def flatten( bsq : C{type E=C{type E=A}} ) : C{type E=A}
}
// Now, how to make a version of BraceList since List is parametrically
typed?
--
L.G. Meredith
Managing Partner
Biosimilarity LLC
1219 NW 83rd St
Seattle, WA 98117
+1 206.650.3740
http://biosimilarity.blogspot.com
--
L.G. Meredith
Managing Partner
Biosimilarity LLC
1219 NW 83rd St
Seattle, WA 98117
+1 206.650.3740
http://biosimilarity.blogspot.com
Disclaimer: http://www.kuleuven.be/cwis/email_disclaimer.htm for more
information.
--
L.G. Meredith
[Lift] Re: preso on monadic design patterns for the web
Everyone, Thanks for all the positive feedback. Eric Bowman found the link to the slides. Best wishes, --greg On Mon, Jun 29, 2009 at 1:51 AM, Eric Bowman ebow...@boboco.ie wrote: Here? http://svn.biosimilarity.com/src/open/talks/MonadicDesignPatternsForTheWeb.pdf Timothy Perrett wrote: +1 would love to read the slides properly. Cheers, Tim On Jun 29, 8:59 am, Jonas Bonér jbo...@gmail.com wrote: Great talk. Thanks. Could you post the slides? It was a bit hard to see them. /Jonas 2009/6/29 Meredith Gregory lgreg.mered...@gmail.com: All, The talk i recently gave on this topic is now available online. Best wishes, --greg -- L.G. Meredith Managing Partner Biosimilarity LLC 1219 NW 83rd St Seattle, WA 98117 +1 206.650.3740 http://biosimilarity.blogspot.com -- Jonas Bonér twitter: @jboner blog:http://jonasboner.com work: http://crisp.se work: http://scalablesolutions.se code: http://github.com/jboner -- Eric Bowman Boboco Ltd ebow...@boboco.ie http://www.boboco.ie/ebowman/pubkey.pgp +35318394189/+353872801532http://www.boboco.ie/ebowman/pubkey.pgp%0A+35318394189/+353872801532 -- L.G. Meredith Managing Partner Biosimilarity LLC 1219 NW 83rd St Seattle, WA 98117 +1 206.650.3740 http://biosimilarity.blogspot.com --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups Lift group. To post to this group, send email to liftweb@googlegroups.com To unsubscribe from this group, send email to liftweb+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/liftweb?hl=en -~--~~~~--~~--~--~---
[Lift] preso on monadic design patterns for the web
All, The talk i recently gave on this topic is now available onlinehttp://www.vimeo.com/5318303 . Best wishes, --greg -- L.G. Meredith Managing Partner Biosimilarity LLC 1219 NW 83rd St Seattle, WA 98117 +1 206.650.3740 http://biosimilarity.blogspot.com --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups Lift group. To post to this group, send email to liftweb@googlegroups.com To unsubscribe from this group, send email to liftweb+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/liftweb?hl=en -~--~~~~--~~--~--~---
[Lift] unexpectedly abrupt end for such an innocent mistake
All,
See the trace below. Is this how we'd like this error to be handled?
Best wishes,
--greg
Welcome to Scala version 2.7.4.final (Java HotSpot(TM) Client VM, Java
1.5.0_16).
Type in expressions to have them evaluated.
Type :help for more information.
scala List( 1, 2, 3 ) match { case List( 1, x* ) = x case _ = throw new
Exception() }
Exception in thread main java.lang.Error: symbol value x does not exist in
line1$object$$iw$$iw.init
at
scala.tools.nsc.backend.icode.GenICode$ICodePhase.scala$tools$nsc$backend$icode$GenICode$ICodePhase$$genLoad(GenICode.scala:912)
at
scala.tools.nsc.backend.icode.GenICode$ICodePhase.scala$tools$nsc$backend$icode$GenICode$ICodePhase$$genLoad(GenICode.scala:402)
at
scala.tools.nsc.backend.icode.GenICode$ICodePhase.scala$tools$nsc$backend$icode$GenICode$ICodePhase$$genLoad(GenICode.scala:455)
at
scala.tools.nsc.backend.icode.GenICode$ICodePhase.scala$tools$nsc$backend$icode$GenICode$ICodePhase$$genLoad(GenICode.scala:939)
at
scala.tools.nsc.backend.icode.GenICode$ICodePhase.scala$tools$nsc$backend$icode$GenICode$ICodePhase$$genStat(GenICode.scala:171)
at
scala.tools.nsc.backend.icode.GenICode$ICodePhase$$anonfun$genStat$1.apply(GenICode.scala:146)
at
scala.tools.nsc.backend.icode.GenICode$ICodePhase$$anonfun$genStat$1.apply(GenICode.scala:145)
at scala.List.foreach(List.scala:841)
at
scala.tools.nsc.backend.icode.GenICode$ICodePhase.genStat(GenICode.scala:145)
at
scala.tools.nsc.backend.icode.GenICode$ICodePhase.scala$tools$nsc$backend$icode$GenICode$ICodePhase$$genLoad(GenICode.scala:938)
at
scala.tools.nsc.backend.icode.GenICode$ICodePhase.gen(GenICode.scala:114)
at
scala.tools.nsc.backend.icode.GenICode$ICodePhase$$anonfun$gen$1.apply(GenICode.scala:71)
at
scala.tools.nsc.backend.icode.GenICode$ICodePhase$$anonfun$gen$1.apply(GenICode.scala:71)
at scala.List.foreach(List.scala:841)
at
scala.tools.nsc.backend.icode.GenICode$ICodePhase.gen(GenICode.scala:71)
at
scala.tools.nsc.backend.icode.GenICode$ICodePhase.gen(GenICode.scala:136)
at
scala.tools.nsc.backend.icode.GenICode$ICodePhase.gen(GenICode.scala:90)
at
scala.tools.nsc.backend.icode.GenICode$ICodePhase$$anonfun$gen$1.apply(GenICode.scala:71)
at
scala.tools.nsc.backend.icode.GenICode$ICodePhase$$anonfun$gen$1.apply(GenICode.scala:71)
at scala.List.foreach(List.scala:841)
at
scala.tools.nsc.backend.icode.GenICode$ICodePhase.gen(GenICode.scala:71)
at
scala.tools.nsc.backend.icode.GenICode$ICodePhase.gen(GenICode.scala:81)
at
scala.tools.nsc.backend.icode.GenICode$ICodePhase.gen(GenICode.scala:67)
at
scala.tools.nsc.backend.icode.GenICode$ICodePhase.apply(GenICode.scala:63)
at scala.tools.nsc.Global$GlobalPhase.applyPhase(Global.scala:267)
at
scala.tools.nsc.Global$GlobalPhase$$anonfun$run$1.apply(Global.scala:246)
at
scala.tools.nsc.Global$GlobalPhase$$anonfun$run$1.apply(Global.scala:246)
at scala.Iterator$class.foreach(Iterator.scala:414)
at
scala.collection.mutable.ListBuffer$$anon$1.foreach(ListBuffer.scala:266)
at scala.tools.nsc.Global$GlobalPhase.run(Global.scala:246)
at
scala.tools.nsc.backend.icode.GenICode$ICodePhase.run(GenICode.scala:56)
at scala.tools.nsc.Global$Run.compileSources(Global.scala:574)
at scala.tools.nsc.Interpreter$Request.compile(Interpreter.scala:820)
at scala.tools.nsc.Interpreter.interpret(Interpreter.scala:505)
at scala.tools.nsc.Interpreter.interpret(Interpreter.scala:494)
at
scala.tools.nsc.InterpreterLoop.interpretStartingWith(InterpreterLoop.scala:242)
at scala.tools.nsc.InterpreterLoop.command(InterpreterLoop.scala:230)
at scala.tools.nsc.InterpreterLoop.repl(InterpreterLoop.scala:142)
at scala.tools.nsc.InterpreterLoop.main(InterpreterLoop.scala:298)
at scala.tools.nsc.MainGenericRunner$.main(MainGenericRunner.scala:141)
at scala.tools.nsc.MainGenericRunner.main(MainGenericRunner.scala)
Process inferior-scala exited abnormally with code 1
--
L.G. Meredith
Managing Partner
Biosimilarity LLC
1219 NW 83rd St
Seattle, WA 98117
+1 206.650.3740
http://biosimilarity.blogspot.com
--~--~-~--~~~---~--~~
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[Lift] Re: [scala] unexpectedly abrupt end for such an innocent mistake
Paul, Thanks for all your kind feedback. i wasn't really concerned about the long stack trace. i was concerned about the termination of the REPL process. Best wishes, --greg On Fri, Jun 26, 2009 at 2:44 PM, Paul Phillips pa...@improving.org wrote: On Fri, Jun 26, 2009 at 02:34:06PM -0700, Meredith Gregory wrote: See the trace below. Is this how we'd like this error to be handled? There was a fierce debate between outputting a brief error message and spewing a long stack trace, but in the end we went with the stack trace. (Perhaps you don't realize how Is this how we'd like this error to be handled? comes across.) Can I give some general encouragement to people to use the bug database to report bugs rather than sending them to the lists, unless there is something super unusual and fascinating about that particular bug, keeping in mind there are hundreds of open tickets which should be no less important for being a little (or a lot) older. -- Paul Phillips | Where there's smoke, there's mirrors! Apatheist | Empiricist | pal, i pill push |--* http://www.improving.org/paulp/*-- -- L.G. Meredith Managing Partner Biosimilarity LLC 1219 NW 83rd St Seattle, WA 98117 +1 206.650.3740 http://biosimilarity.blogspot.com --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups Lift group. To post to this group, send email to liftweb@googlegroups.com To unsubscribe from this group, send email to liftweb+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/liftweb?hl=en -~--~~~~--~~--~--~---
[Lift] Re: higher-kinded types
All,
The following code works without going through the M-P-O construction. It
enjoys approximately the same brevity as a Haskell type class.
// smallest expression of monad i can find
trait MBrace[C[_] : MBrace[C,A],A] {
def nest( a : A ) : C[A]
def flatten[T : C[C[A]]]( bsq : T ) : C[A]
}
// one of the simplest witnesses of monad i can find
class MBraceSeq[A]( a_ : A* ) extends Seq[A] with MBrace[MBraceSeq,A] {
override def nest( a : A ) = new MBraceSeq[A]( a )
override def flatten[T : MBraceSeq[MBraceSeq[A]]]( bsq : T ) :
MBraceSeq[A] = {
(new MBraceSeq[A]( ) /: bsq)( {
( acc : MBraceSeq[A], e : MBraceSeq[A] ) = ( acc ++ e
).asInstanceOf[MBraceSeq[A]]
} )
}
override def length = a_.length
override def elements = a_.elements
override def apply( n : Int ) = a_.apply( n )
}
Best wishes,
--greg
On Wed, Jun 24, 2009 at 3:49 PM, Meredith Gregory
lgreg.mered...@gmail.comwrote:
All,
Am i correct in concluding that the solution in The Moors-Piessens-Odersky
paper only works with collections that have been clever enough to have used
type members rather that type parameters? Or, is there a trick to making the
vast majority of the collections types that are parametrically typed look as
if they have type members? (See example below.)
Best wishes,
--greg
// Paraphrasing the basic Moors-Piessens-Odersky construction
trait TypeCtor1 { type E }
trait Brace[A] extends TypeCtor1 {
type C : TypeCtor1
def nest( a : A ) : C{type E = A}
def flatten( bsq : C{type E=C{type E=A}} ) : C{type E=A}
}
// Now, how to make a version of BraceList since List is parametrically
typed?
--
L.G. Meredith
Managing Partner
Biosimilarity LLC
1219 NW 83rd St
Seattle, WA 98117
+1 206.650.3740
http://biosimilarity.blogspot.com
--
L.G. Meredith
Managing Partner
Biosimilarity LLC
1219 NW 83rd St
Seattle, WA 98117
+1 206.650.3740
http://biosimilarity.blogspot.com
--~--~-~--~~~---~--~~
You received this message because you are subscribed to the Google Groups
Lift group.
To post to this group, send email to liftweb@googlegroups.com
To unsubscribe from this group, send email to
liftweb+unsubscr...@googlegroups.com
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-~--~~~~--~~--~--~---
[Lift] From JPA question to ScalaQuery to Collection Abstractions
of
widespread use of UserTypes. Unlike Greg, in my case I can hand-craft
all my hibernate xml files if I need.
Tim
On Jun 23, 1:46 am, Derek Chen-Becker dchenbec...@gmail.com wrote:
For sufficiently complex relationships, JPA is not a good fit. Beyond a
certain point it's usually simpler to roll your own. I think that this
is
somewhat of a failing of the model, but it's not a simple problem to
solve
in the generic case.
Derek
On Mon, Jun 22, 2009 at 6:45 PM, Derek Chen-Becker
dchenbec...@gmail.comwrote:
Ah, sorry, I lost track of the thread.
On Mon, Jun 22, 2009 at 4:55 PM, Meredith Gregory
lgreg.mered...@gmail.com wrote:
Derek,
You are correct and i noted and reported this on Scala on Friday.
However,
if you have a chain of the form
AbstractClass - Class -contains- AbstractClass -Class -contains-
...
The @MappedSuperclass solution fails at level 2.
Best wishes,
--greg
On Mon, Jun 22, 2009 at 3:52 PM, Derek Chen-Becker
dchenbec...@gmail.com
wrote:
Something I just want to throw out into the discussion: Since you're
using table-per-class, having a @Table annotation on
AbstractContainer
doesn't do anything since abstract classes can't have instances.
Tables are
only generated for abstract classes if you're using a JOINED
inheritance
strategy. You might want to look at using the MappedSuperclass
annotation
for the abstract base class instead. If I change the
AbstractContainer def
to:
@MappedSuperclass
public abstract class AbstractContainer implements
java.io.Serializable {
and then modify MySampleFuContainer to:
public class MySampleFuContainer extends AbstractContainer {
then I seem to get the proper schema:
create table lingo_production.MySampleFuContainer_table (
id varchar(255) not null,
uuid varchar(255),
mysamplingmumble__idSuper varchar(255),
primary key (id),
unique (uuid)
);
Having said that, I think that the behavior you're currently seeing
appears to be a bug.
Derek
On Mon, Jun 22, 2009 at 3:43 PM, Meredith Gregory
lgreg.mered...@gmail.com wrote:
Kris,
Here
http://svn.biosimilarity.com/src/open/codesamples/trunk/hibernate/is a
link to the self-contained example that now uses just Java. i included
the target dir in the repo to speed up investigation, but you can
just blow
that away and build from scratch. The example is currently written
to
Java1.6, but also exhibits the same behavior under Java1.5. To run
the
example
svn co
http://svn.biosimilarity.com/src/open/codesamples/trunk/hibernate
...
env PATH=path-to-java1.6:$PATH JAVA_HOME=path-to-java1.6 mvn
clean
compile process-classes
If you switch comment and decl at line 22 in
src/main/java/maxb/hbex2/MySampleFuContainer.java then you see the
error.
The schema goes from
create table lingo_production.MySampleFuContainer_table (
id_AbstractContainer varchar(255) not null,
varchar(255) not null,
uuid varchar(255),
mysamplingmumble__idSuper varchar(255),
primary key (id),
unique (uuid)
);
to
create table lingo_production.MySampleFuContainer_table (
id_AbstractContainer varchar(255) not null,
id varchar(255),
mysamplingmumble_ tinyblob,
uuid varchar(255),
primary key (id_AbstractContainer),
unique (id_AbstractContainer)
);
Best wishes,
--greg
On Mon, Jun 22, 2009 at 1:38 PM, Meredith Gregory
lgreg.mered...@gmail.com wrote:
Kris,
Thanks for the suggestion. i've now got a tiny little example that
compiles on its own that illustrates the problem. Changing the
inheritance
strategy to JOINED makes no difference. Hibernate still does the
wrong
thing.
Best wishes,
--greg
On Mon, Jun 22, 2009 at 8:55 AM, Kris Nuttycombe
kris.nuttyco...@gmail.com wrote:
This may be off the mark, but I'm wondering if the reason that
you're
having difficulty with the parallel inheritance hierarchy problem
is
not your use of TABLE_PER_CLASS inheritance. In my application, I
have
a similar construct, but I am using JOINED_TABLE inheritance.
This
allows for a normal foreign key relationship to be created in the
database between C2_table and the base table for CThing, with the
result that Hibernate will generate the query for CThing member
as a
union. Using table per class inheritance, I would expect
Hibernate to
need to synthesize an additional dtype field in C2_table along
with
the key column in order to enforce the uniqueness of the keys to
the
joined entities, and I don't believe that it does this.
I'm not sure how the fact that the code is generated is
particularly
relevant; surely if it's possible to hand-write a successful
solution
[Lift] Re: Stax
David, Cool. About 6 weeks ago i started down the path of evaluating them, but saw no free service and stopped; and then the GAE noise began. Best wishes, --greg On Wed, Jun 24, 2009 at 12:08 PM, David Pollak feeder.of.the.be...@gmail.com wrote: They will have a free level On Jun 24, 2009 11:46 AM, Naftoli Gugenheim naftoli...@gmail.com wrote: Anyone know what kind of pricing they have? Do they have a free level like GAE? On Wed, Jun 24, 2009 at 12:43 PM, David Pollak feeder.of.the.be...@gmail.com wrote: On Wed, Jun 24, 2009 at 9:02 AM, Timothy Perrett timo...@getintheloop.eu wrote:A... Lift, the simply functional web framework http://liftweb.net Beginning Scala http://www.apress.c... -- L.G. Meredith Managing Partner Biosimilarity LLC 1219 NW 83rd St Seattle, WA 98117 +1 206.650.3740 http://biosimilarity.blogspot.com --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups Lift group. To post to this group, send email to liftweb@googlegroups.com To unsubscribe from this group, send email to liftweb+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/liftweb?hl=en -~--~~~~--~~--~--~---
[Lift] Re: JPA and auto generation of id
David,
The GenericGenerator annotation was the solution i found worked for me for
Hibernate 3.3.2GA, and the one i suggested you investigate. i'm glad you've
gotten past that one.
Best wishes,
--greg
On Wed, Jun 24, 2009 at 3:29 PM, David Persons dhwpers...@gmail.com wrote:
Thanks for all the answers guys.
I managed to fix the id problem, I needed the Hibernate specific class
GenericGenerator to fix it, which of cource is less pretty then using
only JPA. Someone has an example of how to make it work with MySql and
only JPA annotations? Current version:
@Entity
class Scene {
@Id
@GenericGenerator{val name=hibernate-increment, val
strategy=increment}
@GeneratedValue{val strategy = GenerationType.SEQUENCE, val
generator = hibernate-increment}
var id : Long = _
@Column{val unique = true, val nullable = false}
var ordering : Int = _
@Column{val unique = true, val nullable = false}
var name : String =
@ManyToOne{val optional = false}
var storyBoard : StoryBoard = _
}
However, now I get an org.hibernate.PropertyValueException: not-null
property references a null or transient value:
model.Scene.storyBoard :-s I tried a lot of things already, the
corresponding StoryBoard is saved and not null, so I guess it has to
be transient. Merging the StoryBoard however still gives the same
error..
I tried to get JPA and Lift working together in the same way as in the
JPADemo example.. Is it the use of MySql which prevents the example
from working for me?
regards,
David
On 23 jun, 00:54, Derek Chen-Becker dchenbec...@gmail.com wrote:
Also, what does the schema for the entity's table look like?
On Mon, Jun 22, 2009 at 4:54 PM, Derek Chen-Becker
dchenbec...@gmail.comwrote:
Mind posting the snippet of code where you're saving the instance? A
merge
should interpret a null ID as a fresh instance, and a persist should
just
save it.
Derek
On Mon, Jun 22, 2009 at 1:50 PM, David Persons dhwpers...@gmail.com
wrote:
I am using MySql (5). After setting the hibernate.dialect to
org.hibernate.dialect.MySQLDialect in my persistence.xml file, I get a
org.hibernate.AssertionFailure: null id :-s
cheers
On 22 jun, 19:18, Derek Chen-Becker dchenbec...@gmail.com wrote:
That's not accurate, at least with Hibernate. By putting the
annotations
on
vars, the compiler ends up putting them on the internal fields,
which
then
forces Hibernate into a field-based persistence model and not a
getter/setter based one. The SQLGrammarException is most likely what
the
other people have said. If you're in Oracle or PostgreSQL, for
instance,
you
need a sequence set up for the auto identity model. What database
are
you
using?
Derek
On Mon, Jun 22, 2009 at 8:54 AM, Eric Bowman ebow...@boboco.ie
wrote:
David Persons wrote:
Hello guys,
I get a org.hibernate.exception.SQLGrammarException: could not
get
or
update next value error everytime I try to save the following
Entity:
@Entity
class Scene {
@Id
@GeneratedValue(){val strategy = GenerationType.AUTO}
var id : Long = _
@Column{val unique = true, val nullable = false}
var ordering : Int = _
@Column{val unique = true, val nullable = false}
var name : String =
@ManyToOne{val optional = false}
var storyBoard : StoryBoard = _
}
You almost certainly need some scala.reflect.BeanProperty
annotations
on
your fields.
cheers,
Eric
--
Eric Bowman
Boboco Ltd
ebow...@boboco.ie
http://www.boboco.ie/ebowman/pubkey.pgp
+35318394189/+353872801532
http://www.boboco.ie/ebowman/pubkey.pgp%0A+35318394189/+353872801532
--
L.G. Meredith
Managing Partner
Biosimilarity LLC
1219 NW 83rd St
Seattle, WA 98117
+1 206.650.3740
http://biosimilarity.blogspot.com
--~--~-~--~~~---~--~~
You received this message because you are subscribed to the Google Groups
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[Lift] Re: Stax
Jon, Sweet! Best wishes, --greg On Wed, Jun 24, 2009 at 3:11 PM, jon jonhoff...@gmail.com wrote: I was able to get the latest lift-example application deployed without a problem: http://helloworld.hoffrocket.staxapps.net/. It's running against a mysql DB that they're hosting, not h2. I got an nginx 502 gateway down with a more substantial app, but their log files were all blank, so I have no idea what the problem was. Their deployment mechanism is war/ear based (ear built locally, then uploaded). It would be cool if they supported standard mvn layouts and could just build your war from source. I'm on a 512kb max upload and lift-example took 5 minutes to deploy. - Jon On Jun 24, 4:21 pm, Tim Nelson tnell...@gmail.com wrote: I think they use Gant.http://gant.codehaus.org/ On Wed, Jun 24, 2009 at 3:10 PM, fan...@gmail.com fan...@gmail.com wrote: Tim Nelson a écrit : [...] I did install their SDK and from what I can tell it's basically some Groovy scripts that use Ant + Ivy. Gradle perhaps ?http://www.gradle.org/ -- Francois Armand http://fanf42.blogspot.com -- L.G. Meredith Managing Partner Biosimilarity LLC 1219 NW 83rd St Seattle, WA 98117 +1 206.650.3740 http://biosimilarity.blogspot.com --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups Lift group. To post to this group, send email to liftweb@googlegroups.com To unsubscribe from this group, send email to liftweb+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/liftweb?hl=en -~--~~~~--~~--~--~---
[Lift] Re: [scala] JPA question
Derek,
i completely concur. i wanted to give it a serious go, however, before i
abandoned it. The issue is that so much of the incumbent technology goes
across this object-relational boundary, i needed a simple case to justify
walking away from this technology. This example provides it. To see just how
non-complex it is, let me state it in common sense terms.
1. Suppose we are building an app for a manufacturing firm, and the firm
ships out its goods in different kinds of containers: plastic-coated
cardboard boxes, metal boxes, etc.
2. Suppose that different kinds of materials go into different kinds of
boxes, and sometimes medicinal or toxic substances go into these containers;
but, every container gets a manifest. When the container contains these
materials that need to be handled with care or attention, the manifest is a
special kind of certified manifest.
We might imagine that this firm has already constructed an object model that
looks like
abstract class Container { ...; Manifest getManifest(); void setManifest(
Manifest manifest ); ... }
class CardboardContainer extends Container { ... }
class MetalContainer extends Container { ... }
abstract class Manifest { ... }
class StdManifest extends Manifest { ... }
class CertifiedManifest extends Manifest { ... }
We need to work with their existing infrastructure. However, this
situation/model breaks Hibernate's implementation of JPA. That such a simple
situation would cause problems indicates to me that these technologies have
never been used in any significant way in production -- otherwise they would
have bumped into such a common case. If i'm wrong about something, here, i'd
love to be disabused of my misunderstanding(s). Currently, i feel i have
enough justification to go to a different kind of solution, such as a
LINQ-based solution.
Best wishes,
--greg
On Mon, Jun 22, 2009 at 5:46 PM, Derek Chen-Becker dchenbec...@gmail.comwrote:
For sufficiently complex relationships, JPA is not a good fit. Beyond a
certain point it's usually simpler to roll your own. I think that this is
somewhat of a failing of the model, but it's not a simple problem to solve
in the generic case.
Derek
On Mon, Jun 22, 2009 at 6:45 PM, Derek Chen-Becker
dchenbec...@gmail.comwrote:
Ah, sorry, I lost track of the thread.
On Mon, Jun 22, 2009 at 4:55 PM, Meredith Gregory
lgreg.mered...@gmail.com wrote:
Derek,
You are correct and i noted and reported this on Scala on Friday.
However, if you have a chain of the form
AbstractClass - Class -contains- AbstractClass -Class -contains- ...
The @MappedSuperclass solution fails at level 2.
Best wishes,
--greg
On Mon, Jun 22, 2009 at 3:52 PM, Derek Chen-Becker
dchenbec...@gmail.com wrote:
Something I just want to throw out into the discussion: Since you're
using table-per-class, having a @Table annotation on AbstractContainer
doesn't do anything since abstract classes can't have instances. Tables are
only generated for abstract classes if you're using a JOINED inheritance
strategy. You might want to look at using the MappedSuperclass annotation
for the abstract base class instead. If I change the AbstractContainer def
to:
@MappedSuperclass
public abstract class AbstractContainer implements java.io.Serializable
{
and then modify MySampleFuContainer to:
public class MySampleFuContainer extends AbstractContainer {
then I seem to get the proper schema:
create table lingo_production.MySampleFuContainer_table (
id varchar(255) not null,
uuid varchar(255),
mysamplingmumble__idSuper varchar(255),
primary key (id),
unique (uuid)
);
Having said that, I think that the behavior you're currently seeing
appears to be a bug.
Derek
On Mon, Jun 22, 2009 at 3:43 PM, Meredith Gregory
lgreg.mered...@gmail.com wrote:
Kris,
Herehttp://svn.biosimilarity.com/src/open/codesamples/trunk/hibernate/is
a link to the self-contained example that now uses just Java. i included
the target dir in the repo to speed up investigation, but you can just
blow
that away and build from scratch. The example is currently written to
Java1.6, but also exhibits the same behavior under Java1.5. To run the
example
svn co
http://svn.biosimilarity.com/src/open/codesamples/trunk/hibernate
...
env PATH=path-to-java1.6:$PATH JAVA_HOME=path-to-java1.6 mvn
clean compile process-classes
If you switch comment and decl at line 22 in
src/main/java/maxb/hbex2/MySampleFuContainer.java then you see the error.
The schema goes from
create table lingo_production.MySampleFuContainer_table (
id_AbstractContainer varchar(255) not null,
varchar(255) not null,
uuid varchar(255),
mysamplingmumble__idSuper varchar(255),
primary key (id),
unique (uuid)
);
to
create table lingo_production.MySampleFuContainer_table (
id_AbstractContainer varchar(255) not null
[Lift] Re: [scala] JPA question
in the generic case.
Derek
On Mon, Jun 22, 2009 at 6:45 PM, Derek Chen-Becker
dchenbec...@gmail.com
wrote:
Ah, sorry, I lost track of the thread.
On Mon, Jun 22, 2009 at 4:55 PM, Meredith Gregory
lgreg.mered...@gmail.com wrote:
Derek,
You are correct and i noted and reported this on Scala on Friday.
However, if you have a chain of the form
AbstractClass - Class -contains- AbstractClass -Class -contains-
...
The @MappedSuperclass solution fails at level 2.
Best wishes,
--greg
On Mon, Jun 22, 2009 at 3:52 PM, Derek Chen-Becker
dchenbec...@gmail.com wrote:
Something I just want to throw out into the discussion: Since you're
using table-per-class, having a @Table annotation on
AbstractContainer
doesn't do anything since abstract classes can't have instances.
Tables are
only generated for abstract classes if you're using a JOINED
inheritance
strategy. You might want to look at using the MappedSuperclass
annotation
for the abstract base class instead. If I change the
AbstractContainer def
to:
@MappedSuperclass
public abstract class AbstractContainer implements
java.io.Serializable
{
and then modify MySampleFuContainer to:
public class MySampleFuContainer extends AbstractContainer {
then I seem to get the proper schema:
create table lingo_production.MySampleFuContainer_table (
id varchar(255) not null,
uuid varchar(255),
mysamplingmumble__idSuper varchar(255),
primary key (id),
unique (uuid)
);
Having said that, I think that the behavior you're currently seeing
appears to be a bug.
Derek
On Mon, Jun 22, 2009 at 3:43 PM, Meredith Gregory
lgreg.mered...@gmail.com wrote:
Kris,
Here is a link to the self-contained example that now uses just
Java.
i included the target dir in the repo to speed up investigation,
but you can
just blow that away and build from scratch. The example is
currently written
to Java1.6, but also exhibits the same behavior under Java1.5. To
run the
example
svn co
http://svn.biosimilarity.com/src/open/codesamples/trunk/hibernate
...
env PATH=path-to-java1.6:$PATH JAVA_HOME=path-to-java1.6 mvn
clean compile process-classes
If you switch comment and decl at line 22 in
src/main/java/maxb/hbex2/MySampleFuContainer.java then you see the
error.
The schema goes from
create table lingo_production.MySampleFuContainer_table (
id_AbstractContainer varchar(255) not null,
varchar(255) not null,
uuid varchar(255),
mysamplingmumble__idSuper varchar(255),
primary key (id),
unique (uuid)
);
to
create table lingo_production.MySampleFuContainer_table (
id_AbstractContainer varchar(255) not null,
id varchar(255),
mysamplingmumble_ tinyblob,
uuid varchar(255),
primary key (id_AbstractContainer),
unique (id_AbstractContainer)
);
Best wishes,
--greg
On Mon, Jun 22, 2009 at 1:38 PM, Meredith Gregory
lgreg.mered...@gmail.com wrote:
Kris,
Thanks for the suggestion. i've now got a tiny little example that
compiles on its own that illustrates the problem. Changing the
inheritance
strategy to JOINED makes no difference. Hibernate still does the
wrong
thing.
Best wishes,
--greg
On Mon, Jun 22, 2009 at 8:55 AM, Kris Nuttycombe
kris.nuttyco...@gmail.com wrote:
This may be off the mark, but I'm wondering if the reason that
you're
having difficulty with the parallel inheritance hierarchy problem
is
not your use of TABLE_PER_CLASS inheritance. In my application, I
have
a similar construct, but I am using JOINED_TABLE inheritance.
This
allows for a normal foreign key relationship to be created in the
database between C2_table and the base table for CThing, with the
result that Hibernate will generate the query for CThing member
as a
union. Using table per class inheritance, I would expect
Hibernate
to
need to synthesize an additional dtype field in C2_table along
with
the key column in order to enforce the uniqueness of the keys to
the
joined entities, and I don't believe that it does this.
I'm not sure how the fact that the code is generated is
particularly
relevant; surely if it's possible to hand-write a successful
solution,
then your code generator could be made aware of how to construct
a
viable solution?
Kris
On Fri, Jun 19, 2009 at 8:47 PM, Meredith
Gregorylgreg.mered...@gmail.com wrote:
All,
i had a similar problem and found the source of the issues.
Spse
you have a
container hierarchy (CTop - C2) side-by-side with a contained
hierarchy
(CThing - CThing1). The inheritance at the top of the
container
hierarchy,
CTop, causes hibernate to bail on tracking the relations and
punt
to
embedded values instead. Rewriting the top
[Lift] Re: [scala] JPA question
, Derek Chen-Becker
dchenbec...@gmail.com
wrote:
Ah, sorry, I lost track of the thread.
On Mon, Jun 22, 2009 at 4:55 PM, Meredith Gregory
lgreg.mered...@gmail.com wrote:
Derek,
You are correct and i noted and reported this on Scala on Friday.
However, if you have a chain of the form
AbstractClass - Class -contains- AbstractClass -Class -contains-
...
The @MappedSuperclass solution fails at level 2.
Best wishes,
--greg
On Mon, Jun 22, 2009 at 3:52 PM, Derek Chen-Becker
dchenbec...@gmail.com wrote:
Something I just want to throw out into the discussion: Since you're
using table-per-class, having a @Table annotation on
AbstractContainer
doesn't do anything since abstract classes can't have instances.
Tables are
only generated for abstract classes if you're using a JOINED
inheritance
strategy. You might want to look at using the MappedSuperclass
annotation
for the abstract base class instead. If I change the
AbstractContainer def
to:
@MappedSuperclass
public abstract class AbstractContainer implements
java.io.Serializable
{
and then modify MySampleFuContainer to:
public class MySampleFuContainer extends AbstractContainer {
then I seem to get the proper schema:
create table lingo_production.MySampleFuContainer_table (
id varchar(255) not null,
uuid varchar(255),
mysamplingmumble__idSuper varchar(255),
primary key (id),
unique (uuid)
);
Having said that, I think that the behavior you're currently seeing
appears to be a bug.
Derek
On Mon, Jun 22, 2009 at 3:43 PM, Meredith Gregory
lgreg.mered...@gmail.com wrote:
Kris,
Here is a link to the self-contained example that now uses just
Java.
i included the target dir in the repo to speed up investigation,
but you can
just blow that away and build from scratch. The example is
currently written
to Java1.6, but also exhibits the same behavior under Java1.5. To
run the
example
svn co
http://svn.biosimilarity.com/src/open/codesamples/trunk/hibernate
...
env PATH=path-to-java1.6:$PATH JAVA_HOME=path-to-java1.6 mvn
clean compile process-classes
If you switch comment and decl at line 22 in
src/main/java/maxb/hbex2/MySampleFuContainer.java then you see the
error.
The schema goes from
create table lingo_production.MySampleFuContainer_table (
id_AbstractContainer varchar(255) not null,
varchar(255) not null,
uuid varchar(255),
mysamplingmumble__idSuper varchar(255),
primary key (id),
unique (uuid)
);
to
create table lingo_production.MySampleFuContainer_table (
id_AbstractContainer varchar(255) not null,
id varchar(255),
mysamplingmumble_ tinyblob,
uuid varchar(255),
primary key (id_AbstractContainer),
unique (id_AbstractContainer)
);
Best wishes,
--greg
On Mon, Jun 22, 2009 at 1:38 PM, Meredith Gregory
lgreg.mered...@gmail.com wrote:
Kris,
Thanks for the suggestion. i've now got a tiny little example that
compiles on its own that illustrates the problem. Changing the
inheritance
strategy to JOINED makes no difference. Hibernate still does the
wrong
thing.
Best wishes,
--greg
On Mon, Jun 22, 2009 at 8:55 AM, Kris Nuttycombe
kris.nuttyco...@gmail.com wrote:
This may be off the mark, but I'm wondering if the reason that
you're
having difficulty with the parallel inheritance hierarchy problem
is
not your use of TABLE_PER_CLASS inheritance. In my application, I
have
a similar construct, but I am using JOINED_TABLE inheritance.
This
allows for a normal foreign key relationship to be created in the
database between C2_table and the base table for CThing, with the
result that Hibernate will generate the query for CThing member
as a
union. Using table per class inheritance, I would expect
Hibernate
to
need to synthesize an additional dtype field in C2_table along
with
the key column in order to enforce the uniqueness of the keys to
the
joined entities, and I don't believe that it does this.
I'm not sure how the fact that the code is generated is
particularly
relevant; surely if it's possible to hand-write a successful
solution,
then your code generator could be made aware of how to construct
a
viable solution?
Kris
On Fri, Jun 19, 2009 at 8:47 PM, Meredith
Gregorylgreg.mered...@gmail.com wrote:
All,
i had a similar problem and found the source of the issues.
Spse
you have a
container hierarchy (CTop - C2) side-by-side with a contained
hierarchy
(CThing - CThing1). The inheritance at the top of the
container
hierarchy,
CTop, causes hibernate to bail on tracking the relations and
punt
to
embedded values instead. Rewriting the top to be a
@MappedSuperClass fixes
the problem in this specific case
[Lift] Re: [scala] JPA question
Oliver,
Thanks. This proposal has been put forward before.
- The code is generated. If the top class is annotated @MappedSuperclass,
why not label every abstract class that is top of its hierarchy
@MappedSuperclass. That's the simplest change to the compilation strategy
that generates this code.
- This fails for the contained element. Specifically, if you also label
the top of the contained element hierarchy @MappedSuperclass, then hibernate
fails to be able to find the Id of the subclasses.
- Futher, how does the compilation scheme know which top class is
contained. That's not possible because someone could always come along and
add another class that was a container. So, this fails to be compositional,
in the extreme.
Best wishes,
--greg
On Tue, Jun 23, 2009 at 4:55 PM, Oliver Lambert olambo...@gmail.com wrote:
I don't understand from the code sample why AbstractContainer has to be an
entity or
have a table or id annotation. I'd be looking at just using the
@MappedSuperclass annotation.
On Wed, Jun 24, 2009 at 9:27 AM, Meredith Gregory
lgreg.mered...@gmail.com wrote:
Kris,
Thanks for this code sample. i will study and see if it offers a way
around the conundrum. In the meantime, here's a code
samplehttp://svn.biosimilarity.com/src/open/codesamples/trunk/hibernate/hbex/illustrating
exactly what i'm talking about.
Best wishes,
--greg
On Tue, Jun 23, 2009 at 2:21 PM, Kris Nuttycombe
kris.nuttyco...@gmail.com wrote:
Oops, forgot a member of the hierarchy, inline below:
On Tue, Jun 23, 2009 at 3:19 PM, Kris
Nuttycombekris.nuttyco...@gmail.com wrote:
I'm just so puzzled by this thread because I have the following entity
hierarchy in my app:
@Entity
@Inheritance(strategy = InheritanceType.JOINED)
@Table(name = payment_source_transaction)
public abstract class PaymentSourceTransactionT extends
PaymentSourceT
extends SubscriptionTransaction implements
MonetaryTransactionT, Serializable {
@ManyToOne(cascade = {CascadeType.MERGE, CascadeType.PERSIST},
optional = false, targetEntity = PaymentSource.class)
private T paymentSource;
...
}
@Entity
public abstract class CreditCardTransaction extends
PaymentSourceTransactionCreditCard { ... }
@MappedSuperclass
public abstract class VoidableCCTransaction extends
CreditCardTransaction implements Serializable { ... }
@OneToOne(cascade = {CascadeType.MERGE, CascadeType.PERSIST},
mappedBy=voidedTransaction)
private CCVoidTransaction voidTransaction;
@Entity
public class CCAuthTransaction extends VoidableCCTransaction
implements AuthTransactionCreditCard, Divisional, Serializable { ..
}
@Entity
@Inheritance(strategy = InheritanceType.SINGLE_TABLE)
public abstract class CCCaptureTransaction extends
VoidableCCTransaction implements Serializable,
CaptureTransactionCreditCard {
private static final long serialVersionUID = 1L;
@OneToOne(cascade = {CascadeType.PERSIST, CascadeType.MERGE})
private CCAuthTransaction authTransaction;
...
}
@Entity
public class EcometryCaptureTransaction extends CCCaptureTransaction
implements EcometryOrder, Serializable { ... }
@Entity
@Inheritance(strategy = InheritanceType.JOINED)
public abstract class PaymentSourceT extends PaymentSourceT
extends UUEntity implements MutationControlledT, Serializable { ...
}
@Entity
public class CreditCard extends PaymentSourceCreditCard implements
Addressable, Serializable { ... }
@Entity
public class CheckingAccount extends PaymentSourceCheckingAccount
implements Serializable { ... }
This works for me without difficulty. What am I missing that is
different about this scheme than the one that you describe?
Kris
On Tue, Jun 23, 2009 at 11:29 AM, Meredith
Gregorylgreg.mered...@gmail.com wrote:
Derek,
i completely concur. i wanted to give it a serious go, however, before
i
abandoned it. The issue is that so much of the incumbent technology
goes
across this object-relational boundary, i needed a simple case to
justify
walking away from this technology. This example provides it. To see
just how
non-complex it is, let me state it in common sense terms.
Suppose we are building an app for a manufacturing firm, and the firm
ships
out its goods in different kinds of containers: plastic-coated
cardboard
boxes, metal boxes, etc.
Suppose that different kinds of materials go into different kinds of
boxes,
and sometimes medicinal or toxic substances go into these containers;
but,
every container gets a manifest. When the container contains these
materials
that need to be handled with care or attention, the manifest is a
special
kind of certified manifest.
We might imagine that this firm has already constructed an object
model that
looks like
abstract class Container { ...; Manifest getManifest(); void
setManifest(
Manifest manifest
[Lift] Re: JPA and auto generation of id
David,
i recently ran into an issue that smells exactly like this. For hibernate i
had to do the following:
@Id
@GeneratedValue(){generator = system-uuid}
@GenericGenerator(){name = system-uuid, strategy = uuid}
This is hibernate specific. This was for an Id property that was typed
String.
Best wishes,
--greg
On Mon, Jun 22, 2009 at 2:08 AM, David Persons dhwpers...@gmail.com wrote:
Hello guys,
I get a org.hibernate.exception.SQLGrammarException: could not get or
update next value error everytime I try to save the following Entity:
@Entity
class Scene {
@Id
@GeneratedValue(){val strategy = GenerationType.AUTO}
var id : Long = _
@Column{val unique = true, val nullable = false}
var ordering : Int = _
@Column{val unique = true, val nullable = false}
var name : String =
@ManyToOne{val optional = false}
var storyBoard : StoryBoard = _
}
What am I doing wrong??
grtz,
David Persons
--
L.G. Meredith
Managing Partner
Biosimilarity LLC
1219 NW 83rd St
Seattle, WA 98117
+1 206.650.3740
http://biosimilarity.blogspot.com
--~--~-~--~~~---~--~~
You received this message because you are subscribed to the Google Groups
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[Lift] Re: [scala] JPA question
Kris,
Thanks for the suggestion. i've now got a tiny little example that compiles
on its own that illustrates the problem. Changing the inheritance strategy
to JOINED makes no difference. Hibernate still does the wrong thing.
Best wishes,
--greg
On Mon, Jun 22, 2009 at 8:55 AM, Kris Nuttycombe
kris.nuttyco...@gmail.comwrote:
This may be off the mark, but I'm wondering if the reason that you're
having difficulty with the parallel inheritance hierarchy problem is
not your use of TABLE_PER_CLASS inheritance. In my application, I have
a similar construct, but I am using JOINED_TABLE inheritance. This
allows for a normal foreign key relationship to be created in the
database between C2_table and the base table for CThing, with the
result that Hibernate will generate the query for CThing member as a
union. Using table per class inheritance, I would expect Hibernate to
need to synthesize an additional dtype field in C2_table along with
the key column in order to enforce the uniqueness of the keys to the
joined entities, and I don't believe that it does this.
I'm not sure how the fact that the code is generated is particularly
relevant; surely if it's possible to hand-write a successful solution,
then your code generator could be made aware of how to construct a
viable solution?
Kris
On Fri, Jun 19, 2009 at 8:47 PM, Meredith
Gregorylgreg.mered...@gmail.com wrote:
All,
i had a similar problem and found the source of the issues. Spse you have
a
container hierarchy (CTop - C2) side-by-side with a contained hierarchy
(CThing - CThing1). The inheritance at the top of the container
hierarchy,
CTop, causes hibernate to bail on tracking the relations and punt to
embedded values instead. Rewriting the top to be a @MappedSuperClass
fixes
the problem in this specific case. However, if your hierarchy is deep,
you're screwed.
If anybody has a suggestion for a workaround, i'm all ears. The problem
is
that it would appear that both Mr Crowley and i are generating Java + JPA
code. So, the solution needs to be algorithmic and not 1-off.
Perhaps the best solution is to find an alternative to hibernate as this
is
a particularly irritating bug.
Best wishes,
--greg
@Entity
@Inheritance(strategy = InheritanceType.TABLE_PER_CLASS)
abstract class CTop {
...
@Id
@GeneratedValue(generator = system-uuid)
@GenericGenerator(name = system-uuid, strategy = uuid)
private String id_CTop;
}
@Entity
@Inheritance(strategy = InheritanceType.TABLE_PER_CLASS)
abstract class CThing {
...
@Id
@GeneratedValue(generator = system-uuid)
@GenericGenerator(name = system-uuid, strategy = uuid)
private String id_CThing;
}
@Entity
@Inheritance(strategy = InheritanceType.TABLE_PER_CLASS)
@Table(name = C2_table, catalog = mydb_production, uniqueConstraints
= {
@UniqueConstraint(columnNames = uuid) })
class C2 extends CTop {
CThing thing;
...
@OneToOne
@JoinColumn
public CThing getThing() {
return this.thing;
}
public void setThing( CThing thing ) {
this.thing = thing;
}
@Column(name = uuid, unique = false, nullable = true, insertable =
true,
updatable = true)
public String getUuid() {
return this.uuid;
}
public void setUuid(String uuid) {
this.uuid = uuid;
}
@Id
@GeneratedValue(generator = system-uuid)
@GenericGenerator(name = system-uuid, strategy = uuid)
@Column(name = id, unique = false, nullable = true, insertable =
true,
updatable = true)
public String getId() {
return this.id;
}
}
@Entity
@Inheritance(strategy = InheritanceType.TABLE_PER_CLASS)
@Table(name = CThing1_table, catalog = mydb_production,
uniqueConstraints = { @UniqueConstraint(columnNames = uuid) })
class CThing1 extends CThing {
...
// lots of ground type fields
@Column(name = uuid, unique = false, nullable = true, insertable =
true,
updatable = true)
public String getUuid() {
return this.uuid;
}
public void setUuid(String uuid) {
this.uuid = uuid;
}
@Id
@GeneratedValue(generator = system-uuid)
@GenericGenerator(name = system-uuid, strategy = uuid)
@Column(name = id, unique = false, nullable = true, insertable =
true,
updatable = true)
public String getId() {
return this.id;
}
}
On Tue, Jun 16, 2009 at 1:45 PM, Derek Chen-Becker j...@chen-becker.org
wrote:
John Nilsson wrote:
Hi,
I think the showSql property has been deprecated in favor of log4j
loggers.
If you set the log4j level to TRACE for org.hibernate you'll get
everything Hibernate has to say about what it is doing. Can't remember
which one it is, but I know one of the loggers will give you the
values used in queries at the TRACE level.
Good to
[Lift] Re: [scala] JPA question
Kris,
Here http://svn.biosimilarity.com/src/open/codesamples/trunk/hibernate/ is
a link to the self-contained example that now uses just Java. i included the
target dir in the repo to speed up investigation, but you can just blow that
away and build from scratch. The example is currently written to Java1.6,
but also exhibits the same behavior under Java1.5. To run the example
svn co http://svn.biosimilarity.com/src/open/codesamples/trunk/hibernate
...
env PATH=path-to-java1.6:$PATH JAVA_HOME=path-to-java1.6 mvn clean
compile process-classes
If you switch comment and decl at line 22 in
src/main/java/maxb/hbex2/MySampleFuContainer.java then you see the error.
The schema goes from
create table lingo_production.MySampleFuContainer_table (
id_AbstractContainer varchar(255) not null,
varchar(255) not null,
uuid varchar(255),
mysamplingmumble__idSuper varchar(255),
primary key (id),
unique (uuid)
);
to
create table lingo_production.MySampleFuContainer_table (
id_AbstractContainer varchar(255) not null,
id varchar(255),
mysamplingmumble_ tinyblob,
uuid varchar(255),
primary key (id_AbstractContainer),
unique (id_AbstractContainer)
);
Best wishes,
--greg
On Mon, Jun 22, 2009 at 1:38 PM, Meredith Gregory
lgreg.mered...@gmail.comwrote:
Kris,
Thanks for the suggestion. i've now got a tiny little example that compiles
on its own that illustrates the problem. Changing the inheritance strategy
to JOINED makes no difference. Hibernate still does the wrong thing.
Best wishes,
--greg
On Mon, Jun 22, 2009 at 8:55 AM, Kris Nuttycombe
kris.nuttyco...@gmail.com wrote:
This may be off the mark, but I'm wondering if the reason that you're
having difficulty with the parallel inheritance hierarchy problem is
not your use of TABLE_PER_CLASS inheritance. In my application, I have
a similar construct, but I am using JOINED_TABLE inheritance. This
allows for a normal foreign key relationship to be created in the
database between C2_table and the base table for CThing, with the
result that Hibernate will generate the query for CThing member as a
union. Using table per class inheritance, I would expect Hibernate to
need to synthesize an additional dtype field in C2_table along with
the key column in order to enforce the uniqueness of the keys to the
joined entities, and I don't believe that it does this.
I'm not sure how the fact that the code is generated is particularly
relevant; surely if it's possible to hand-write a successful solution,
then your code generator could be made aware of how to construct a
viable solution?
Kris
On Fri, Jun 19, 2009 at 8:47 PM, Meredith
Gregorylgreg.mered...@gmail.com wrote:
All,
i had a similar problem and found the source of the issues. Spse you
have a
container hierarchy (CTop - C2) side-by-side with a contained hierarchy
(CThing - CThing1). The inheritance at the top of the container
hierarchy,
CTop, causes hibernate to bail on tracking the relations and punt to
embedded values instead. Rewriting the top to be a @MappedSuperClass
fixes
the problem in this specific case. However, if your hierarchy is deep,
you're screwed.
If anybody has a suggestion for a workaround, i'm all ears. The problem
is
that it would appear that both Mr Crowley and i are generating Java +
JPA
code. So, the solution needs to be algorithmic and not 1-off.
Perhaps the best solution is to find an alternative to hibernate as this
is
a particularly irritating bug.
Best wishes,
--greg
@Entity
@Inheritance(strategy = InheritanceType.TABLE_PER_CLASS)
abstract class CTop {
...
@Id
@GeneratedValue(generator = system-uuid)
@GenericGenerator(name = system-uuid, strategy = uuid)
private String id_CTop;
}
@Entity
@Inheritance(strategy = InheritanceType.TABLE_PER_CLASS)
abstract class CThing {
...
@Id
@GeneratedValue(generator = system-uuid)
@GenericGenerator(name = system-uuid, strategy = uuid)
private String id_CThing;
}
@Entity
@Inheritance(strategy = InheritanceType.TABLE_PER_CLASS)
@Table(name = C2_table, catalog = mydb_production, uniqueConstraints
= {
@UniqueConstraint(columnNames = uuid) })
class C2 extends CTop {
CThing thing;
...
@OneToOne
@JoinColumn
public CThing getThing() {
return this.thing;
}
public void setThing( CThing thing ) {
this.thing = thing;
}
@Column(name = uuid, unique = false, nullable = true, insertable =
true,
updatable = true)
public String getUuid() {
return this.uuid;
}
public void setUuid(String uuid) {
this.uuid = uuid;
}
@Id
@GeneratedValue(generator = system-uuid)
@GenericGenerator(name = system-uuid, strategy = uuid)
@Column(name = id, unique = false, nullable = true, insertable
[Lift] Re: [scala] JPA question
Derek,
You are correct and i noted and reported this on Scala on Friday. However,
if you have a chain of the form
AbstractClass - Class -contains- AbstractClass -Class -contains- ...
The @MappedSuperclass solution fails at level 2.
Best wishes,
--greg
On Mon, Jun 22, 2009 at 3:52 PM, Derek Chen-Becker dchenbec...@gmail.comwrote:
Something I just want to throw out into the discussion: Since you're using
table-per-class, having a @Table annotation on AbstractContainer doesn't do
anything since abstract classes can't have instances. Tables are only
generated for abstract classes if you're using a JOINED inheritance
strategy. You might want to look at using the MappedSuperclass annotation
for the abstract base class instead. If I change the AbstractContainer def
to:
@MappedSuperclass
public abstract class AbstractContainer implements java.io.Serializable {
and then modify MySampleFuContainer to:
public class MySampleFuContainer extends AbstractContainer {
then I seem to get the proper schema:
create table lingo_production.MySampleFuContainer_table (
id varchar(255) not null,
uuid varchar(255),
mysamplingmumble__idSuper varchar(255),
primary key (id),
unique (uuid)
);
Having said that, I think that the behavior you're currently seeing appears
to be a bug.
Derek
On Mon, Jun 22, 2009 at 3:43 PM, Meredith Gregory
lgreg.mered...@gmail.com wrote:
Kris,
Here http://svn.biosimilarity.com/src/open/codesamples/trunk/hibernate/is
a link to the self-contained example that now uses just Java. i included
the target dir in the repo to speed up investigation, but you can just blow
that away and build from scratch. The example is currently written to
Java1.6, but also exhibits the same behavior under Java1.5. To run the
example
svn co
http://svn.biosimilarity.com/src/open/codesamples/trunk/hibernate
...
env PATH=path-to-java1.6:$PATH JAVA_HOME=path-to-java1.6 mvn clean
compile process-classes
If you switch comment and decl at line 22 in
src/main/java/maxb/hbex2/MySampleFuContainer.java then you see the error.
The schema goes from
create table lingo_production.MySampleFuContainer_table (
id_AbstractContainer varchar(255) not null,
varchar(255) not null,
uuid varchar(255),
mysamplingmumble__idSuper varchar(255),
primary key (id),
unique (uuid)
);
to
create table lingo_production.MySampleFuContainer_table (
id_AbstractContainer varchar(255) not null,
id varchar(255),
mysamplingmumble_ tinyblob,
uuid varchar(255),
primary key (id_AbstractContainer),
unique (id_AbstractContainer)
);
Best wishes,
--greg
On Mon, Jun 22, 2009 at 1:38 PM, Meredith Gregory
lgreg.mered...@gmail.com wrote:
Kris,
Thanks for the suggestion. i've now got a tiny little example that
compiles on its own that illustrates the problem. Changing the inheritance
strategy to JOINED makes no difference. Hibernate still does the wrong
thing.
Best wishes,
--greg
On Mon, Jun 22, 2009 at 8:55 AM, Kris Nuttycombe
kris.nuttyco...@gmail.com wrote:
This may be off the mark, but I'm wondering if the reason that you're
having difficulty with the parallel inheritance hierarchy problem is
not your use of TABLE_PER_CLASS inheritance. In my application, I have
a similar construct, but I am using JOINED_TABLE inheritance. This
allows for a normal foreign key relationship to be created in the
database between C2_table and the base table for CThing, with the
result that Hibernate will generate the query for CThing member as a
union. Using table per class inheritance, I would expect Hibernate to
need to synthesize an additional dtype field in C2_table along with
the key column in order to enforce the uniqueness of the keys to the
joined entities, and I don't believe that it does this.
I'm not sure how the fact that the code is generated is particularly
relevant; surely if it's possible to hand-write a successful solution,
then your code generator could be made aware of how to construct a
viable solution?
Kris
On Fri, Jun 19, 2009 at 8:47 PM, Meredith
Gregorylgreg.mered...@gmail.com wrote:
All,
i had a similar problem and found the source of the issues. Spse you
have a
container hierarchy (CTop - C2) side-by-side with a contained
hierarchy
(CThing - CThing1). The inheritance at the top of the container
hierarchy,
CTop, causes hibernate to bail on tracking the relations and punt to
embedded values instead. Rewriting the top to be a @MappedSuperClass
fixes
the problem in this specific case. However, if your hierarchy is deep,
you're screwed.
If anybody has a suggestion for a workaround, i'm all ears. The
problem is
that it would appear that both Mr Crowley and i are generating Java +
JPA
code. So, the solution needs to be algorithmic and not 1-off.
Perhaps the best solution
[Lift] Re: [scala] JPA question
P.S. While i am waiting for the Hibernate folks to respond to the issue, i
am looking into Stefan Zeiger's LINQ implementation for Scala more
seriously. If it is reasonably stable, this is a much better target for my
compilation scheme, anyway.
On Mon, Jun 22, 2009 at 3:55 PM, Meredith Gregory
lgreg.mered...@gmail.comwrote:
Derek,
You are correct and i noted and reported this on Scala on Friday. However,
if you have a chain of the form
AbstractClass - Class -contains- AbstractClass -Class -contains- ...
The @MappedSuperclass solution fails at level 2.
Best wishes,
--greg
On Mon, Jun 22, 2009 at 3:52 PM, Derek Chen-Becker
dchenbec...@gmail.comwrote:
Something I just want to throw out into the discussion: Since you're using
table-per-class, having a @Table annotation on AbstractContainer doesn't do
anything since abstract classes can't have instances. Tables are only
generated for abstract classes if you're using a JOINED inheritance
strategy. You might want to look at using the MappedSuperclass annotation
for the abstract base class instead. If I change the AbstractContainer def
to:
@MappedSuperclass
public abstract class AbstractContainer implements java.io.Serializable {
and then modify MySampleFuContainer to:
public class MySampleFuContainer extends AbstractContainer {
then I seem to get the proper schema:
create table lingo_production.MySampleFuContainer_table (
id varchar(255) not null,
uuid varchar(255),
mysamplingmumble__idSuper varchar(255),
primary key (id),
unique (uuid)
);
Having said that, I think that the behavior you're currently seeing
appears to be a bug.
Derek
On Mon, Jun 22, 2009 at 3:43 PM, Meredith Gregory
lgreg.mered...@gmail.com wrote:
Kris,
Herehttp://svn.biosimilarity.com/src/open/codesamples/trunk/hibernate/is
a link to the self-contained example that now uses just Java. i included
the target dir in the repo to speed up investigation, but you can just blow
that away and build from scratch. The example is currently written to
Java1.6, but also exhibits the same behavior under Java1.5. To run the
example
svn co
http://svn.biosimilarity.com/src/open/codesamples/trunk/hibernate
...
env PATH=path-to-java1.6:$PATH JAVA_HOME=path-to-java1.6 mvn clean
compile process-classes
If you switch comment and decl at line 22 in
src/main/java/maxb/hbex2/MySampleFuContainer.java then you see the error.
The schema goes from
create table lingo_production.MySampleFuContainer_table (
id_AbstractContainer varchar(255) not null,
varchar(255) not null,
uuid varchar(255),
mysamplingmumble__idSuper varchar(255),
primary key (id),
unique (uuid)
);
to
create table lingo_production.MySampleFuContainer_table (
id_AbstractContainer varchar(255) not null,
id varchar(255),
mysamplingmumble_ tinyblob,
uuid varchar(255),
primary key (id_AbstractContainer),
unique (id_AbstractContainer)
);
Best wishes,
--greg
On Mon, Jun 22, 2009 at 1:38 PM, Meredith Gregory
lgreg.mered...@gmail.com wrote:
Kris,
Thanks for the suggestion. i've now got a tiny little example that
compiles on its own that illustrates the problem. Changing the inheritance
strategy to JOINED makes no difference. Hibernate still does the wrong
thing.
Best wishes,
--greg
On Mon, Jun 22, 2009 at 8:55 AM, Kris Nuttycombe
kris.nuttyco...@gmail.com wrote:
This may be off the mark, but I'm wondering if the reason that you're
having difficulty with the parallel inheritance hierarchy problem is
not your use of TABLE_PER_CLASS inheritance. In my application, I have
a similar construct, but I am using JOINED_TABLE inheritance. This
allows for a normal foreign key relationship to be created in the
database between C2_table and the base table for CThing, with the
result that Hibernate will generate the query for CThing member as a
union. Using table per class inheritance, I would expect Hibernate to
need to synthesize an additional dtype field in C2_table along with
the key column in order to enforce the uniqueness of the keys to the
joined entities, and I don't believe that it does this.
I'm not sure how the fact that the code is generated is particularly
relevant; surely if it's possible to hand-write a successful solution,
then your code generator could be made aware of how to construct a
viable solution?
Kris
On Fri, Jun 19, 2009 at 8:47 PM, Meredith
Gregorylgreg.mered...@gmail.com wrote:
All,
i had a similar problem and found the source of the issues. Spse you
have a
container hierarchy (CTop - C2) side-by-side with a contained
hierarchy
(CThing - CThing1). The inheritance at the top of the container
hierarchy,
CTop, causes hibernate to bail on tracking the relations and punt to
embedded values instead. Rewriting the top to be a @MappedSuperClass
fixes
[Lift] take a lift to the opera for a better performance?
Lifted, Has anyone played with Opera's Unite? i tried it out, today and was disappointed by the performance of their chat service/lounge. i was running over a network that is notoriously slow, but google chat between yvr and sfo was beating the pants off what i was getting from the machine to itself opera - safari. i was wondering if it might be possible to inject lift into the opera mix at a level where you might see some performance improvement. As it stands, their out of the box perf is so bad i can't believe they released when they did. i think it will hurt adoption. Best wishes, --greg -- L.G. Meredith Managing Partner Biosimilarity LLC 1219 NW 83rd St Seattle, WA 98117 +1 206.650.3740 http://biosimilarity.blogspot.com --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups Lift group. To post to this group, send email to liftweb@googlegroups.com To unsubscribe from this group, send email to liftweb+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/liftweb?hl=en -~--~~~~--~~--~--~---
[Lift] Re: scalajpa - while accessing two distincts databases, the second access is made with a connection to the first database
Viktor,
My co-routine yields back to yours!
Hey, it's like Garrison Keillor's Tales from Lake
Wobegonhttp://en.wikipedia.org/wiki/Lake_Wobegon:
where *all* of the children are above average. If you think about it, that
just keeps *lift*ing the children higher and higher and higher...
Speaking of which, i think David's goat rodeo ideas fit pretty well with
some ideas i've been working on regarding a uniform approach to data. This
takes the whole LINQ idea up a couple of notches. To see what i mean, take a
look at the slides for a recent talk i
gavehttp://svn.biosimilarity.com/src/open/talks/MonadicDesignPatternsForTheWeb.pdf.
Comments (peanuts, rotten tomatoes...) would be most welcome.
Best wishes,
--greg
P.S. Oliver's sincere question compelled me to respond with my own best
understanding of the topic.
2009/6/18 Viktor Klang viktor.kl...@gmail.com
I yield to your superiority.
Seriously.
2009/6/18 Meredith Gregory lgreg.mered...@gmail.com
Oliver,
Objects and monads are really not the same. At it's heart the concept of
monad is an appropriately parametric notion of composition. If you have any
experience with abstract algebra, you might recognize that the notion of
a group http://en.wikipedia.org/wiki/Symmetry_group is an appropriately
parametric notion of symmetry. Groups give an exceptionally well abstracted
account of symmetry. Monads give an exceptionally well abstracted notion of
composition. This is a lot easier to see in the Category Theoretic
presentation.
A monad http://en.wikipedia.org/wiki/Monad_%28category_theory%29 is
presented by three pieces of data:
- An endofunctor http://en.wikipedia.org/wiki/Functor M : C - C
(intuitively, think of M as a parametric type constructor and C as the
universe of types and maps)
- A natural
transformationhttp://en.wikipedia.org/wiki/Natural_transformationunit: Id
- M -- this is a higher-order critter: it takes maps to maps; but
i'll give you a metaphor in just a moment.
- A natural transformation mult: M^2 - M
One picture you can have in your mind is M is a kind of box factory.
Then unit says how you can put things into a box, and mult says how you can
flatten nested boxes into an ordinary box (this is the origins of flatMap in
Scala's presentation). Another way of understanding this is that M is a kind
of higher-order compositor, i.e. a way of combining things just like
multiplication, as in a*b, is a way of combining things. Then the unit is
the analog of having a unit for your multiplication and mult is the analog
of an associativity law ( a*(b*c) = (a*b)*c ). These line up with the box
analogy more easily if you write things with prefix notation instead of
infix notation.
- Let's write {*| a, b |*} instead of a*b. The reason we adopt this
more verbose notation is that we can note the different kind of boxes with
the 'color' of the braces. M-colored braces, {M| a, b |M}, are associated
with an M-box.
- Then unit( a ) = {M| a |M}, it puts a in an M-box. This has an
alternate presentation of the form {M| |M}.{M| a |M} = {M| a |M}. i
mention
it to point out the analogy with the binary operation _*_, but it muddies
the water a little with begging the question about the _._. So, i will
just
leave it -- without explanation -- for you to explore.
- And mult( {M| {M| a11, ..., a1J |M} ... {M| aI1, ... aIJ' |M} |M} )
= {M| a11, ..., aIJ' |M}. It tells you how to canonically flatten M-boxes.
This functions as an association because if boxes canonically flatten,
then
{M| a, {M| b, c |M} |M} = {M| a, b, c |M} = {M| {M| a, b |M}, c |M}.
The apparent lexical connection between this way of thinking about things
and XML *is not accidental*. Monads can be viewed as colored braces, aka
matched tags. Monads are a semantical creature that presents syntactically
like XML.
This way of thinking about things is really different from objects. To be
sure, there are notions of objects that are universal and so can be made to
fit or encode just about anything; but, that doesn't mean the encodings are
nice, or scalable or maintainable. You have only to to look at something
like LINQ -- which is really just a presentation of monads -- to see just
how flexible and yet compact the monadic way of structuring composition is.
Specifically, both set-comprehension notation and SELECT-FROM-WHERE, when
interpreted polymorphically, provide a natural representation of the monad.
- { pattern | t1 - generator1, ..., tn - generatorN, constraint1,
..., constraintK }
- SELECT pattern FROM generator WHERE constraint
Those to pieces of computational machinery have very simple, and natural
mappings to the monad operations. You will win if you work these out for
yourself. Phil Wadler has excellent papers to provide cheat sheets. The
Scala for-comprehension and the corresponding operations of map, flatMap and
filter are also excellent cheat sheets
[Lift] Re: scalajpa - while accessing two distincts databases, the second access is made with a connection to the first database
Oliver, You wrote: we would have taken over Google by now. My not-so-secret plan for taking over Google is contained in the deck i posted in response to Viktorhttp://svn.biosimilarity.com/src/open/talks/MonadicDesignPatternsForTheWeb.pdf. Part of the reason i was excited that Jonas took on to make the JTA wrapper monadic is that it composes perfectly with the ideas explained in the deck. These ideas dovetail perfectly with the DSL stuff i've been working on. My feeling is that we are at a point where things could really start to happen. The ideas are 'in the air' so to speak. Best wishes, --greg 2009/6/17 Oliver Lambert olambo...@gmail.com 2009/6/18 Meredith Gregory lgreg.mered...@gmail.com Oliver, The short answer is no. The longer answer is - i worked this all out on my own; so, you guys -- who can program lift on top of scala on top of JVM and are therefore about 20X smarter than i am -- can too. I think if we were all 20X (or 2X) smarter than you, we would have taken over Google by now. - - And also, help is always available, if there is something specific you don't understand, let me know and i will do my best to convey it to you. As suggested by another kind person, I may have to start by going back to (an American?) school. Heres a question, why should I care about Monad's when they are already in OO, just not called Monads? - Best wishes, --greg P.S. Here is a version of the paragraph with links to useful bits of lore from the literature. For myself, i was unhappy with the notion of name. The π-calculihttp://en.wikipedia.org/wiki/Pi-calculusand lambda calculi http://en.wikipedia.org/wiki/Lambda_calculus suffer a dependence on a notion of name. Both families of calculi require at least countably infinitely http://en.wikipedia.org/wiki/Countable many nameshttp://www.cs.nps.navy.mil/research/languages/statements/gordon.html, and a notion of equality on names. If names have no internal structure then these theories *cannot be effectivehttp://en.wikipedia.org/wiki/Computable_function *. The reasons is that the notion of equality must then be realized as an infinitary table which cannot fit in any computer we have access to. Therefore, in effective theories, names must have internal structure. Since they have internal structure and are at least countably infinite, one is in danger of undermining the foundational character of these proposals for computing. Therefore, the only possible solution is that the notion of structured name must come from the notion of program proposed by the model. This argument is airtight. If you want a foundational model of computing with nominal structure, the nominal structure must derive from the notion of computation being put forward, i.e. it must *reflect* the notion of computationhttp://svn.biosimilarity.com/src/open/papers/trunk/concurrency/rho/ex_nihilo_entcs/ex_nihilo_finco.pdf. This gives rise to all kinds of new an beautiful phenomena. One measure of your way into compositional thinking is whether this is happening. Is your approach to compositional thinking beginning to yield whole new aspects of computing, and new 'wholes' of computation, new forms of organization. 2009/6/16 Oliver Lambert olambo...@gmail.com 2009/6/17 Meredith Gregory lgreg.mered...@gmail.com Jeremy, Most excellent question award to you, sir! How to bootstrap thinking compositionally... this is what i did - learn some compositional idioms by heart - do you know the shape of the paradoxical combinator by heart - do you know the data making up a monad - do you know the data making up a distributive law between monads - use them in real world applications and see where they fail - when is calculating the least/greatest fixpoint of a recursive spec for a problem the suboptimal solution - when is a monad not the answer - when is an indexed form of composition inadequate - improve them - is it a situational improvement or - a fundamental improvement - see where the very programming model itself fails - is functional composition the only sort of composition - how is parallel composition like functional composition - is parallel composition easily represented in categorical composition - improve it - what is the view of the world in your notion of composition - play with new programming models - does your new notion of composition give rise to a whole generation of different models - invent new idioms in these models - what are the things these models naturally express - and teach them to someone who wishes to bootstrap thinking compositionally For myself, i was unhappy with the notion of name. The π-calculi and lambda calculi suffer a dependence on a notion of name. Both families of calculi require at least
[Lift] interaction with hibernate crowd?
Lifted and Scalata, Has anyone had any joy engaging the hibernate crowd? i've been trying every channel i can to get someone in the hibernate know to take a look at what i believe is a bug and no one even responds at all. Best wishes, --greg -- L.G. Meredith Managing Partner Biosimilarity LLC 1219 NW 83rd St Seattle, WA 98117 +1 206.650.3740 http://biosimilarity.blogspot.com --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups Lift group. To post to this group, send email to liftweb@googlegroups.com To unsubscribe from this group, send email to liftweb+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/liftweb?hl=en -~--~~~~--~~--~--~---
[Lift] Re: interaction with hibernate crowd?
Viktor, i finally got someone on the hibernate IRC channel to take a look at the problem. He claims that if he removes the final declarator from a field for which i have only a getter and then adds a setter hibernate works as advertised. i will test this out. If no joy i might take you up on your kind offer. Best wishes, --greg On Thu, Jun 18, 2009 at 1:10 PM, Viktor Klang viktor.kl...@gmail.comwrote: Gregory, send the available debug info regarding the suspected defect and I'll see what I can do. Viktor,Rogue Software Architect 18 jun 2009 kl. 21.24 Meredith Gregory lgreg.mered...@gmail.com skrev: Lifted and Scalata, Has anyone had any joy engaging the hibernate crowd? i've been trying every channel i can to get someone in the hibernate know to take a look at what i believe is a bug and no one even responds at all. Best wishes, --greg -- L.G. Meredith Managing Partner Biosimilarity LLC 1219 NW 83rd St Seattle, WA 98117 +1 206.650.3740 http://biosimilarity.blogspot.comhttp://biosimilarity.blogspot.com -- L.G. Meredith Managing Partner Biosimilarity LLC 1219 NW 83rd St Seattle, WA 98117 +1 206.650.3740 http://biosimilarity.blogspot.com --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups Lift group. To post to this group, send email to liftweb@googlegroups.com To unsubscribe from this group, send email to liftweb+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/liftweb?hl=en -~--~~~~--~~--~--~---
[Lift] Re: interaction with hibernate crowd?
All, Can anyone recommend an alternative to hibernate for a JPA implementation? i've been stuck on this bug for several days, now; i need to move on. Best wishes, --greg On Thu, Jun 18, 2009 at 2:09 PM, Meredith Gregory lgreg.mered...@gmail.comwrote: Viktor, i finally got someone on the hibernate IRC channel to take a look at the problem. He claims that if he removes the final declarator from a field for which i have only a getter and then adds a setter hibernate works as advertised. i will test this out. If no joy i might take you up on your kind offer. Best wishes, --greg On Thu, Jun 18, 2009 at 1:10 PM, Viktor Klang viktor.kl...@gmail.comwrote: Gregory, send the available debug info regarding the suspected defect and I'll see what I can do. Viktor,Rogue Software Architect 18 jun 2009 kl. 21.24 Meredith Gregory lgreg.mered...@gmail.com skrev: Lifted and Scalata, Has anyone had any joy engaging the hibernate crowd? i've been trying every channel i can to get someone in the hibernate know to take a look at what i believe is a bug and no one even responds at all. Best wishes, --greg -- L.G. Meredith Managing Partner Biosimilarity LLC 1219 NW 83rd St Seattle, WA 98117 +1 206.650.3740 http://biosimilarity.blogspot.comhttp://biosimilarity.blogspot.com -- L.G. Meredith Managing Partner Biosimilarity LLC 1219 NW 83rd St Seattle, WA 98117 +1 206.650.3740 http://biosimilarity.blogspot.com -- L.G. Meredith Managing Partner Biosimilarity LLC 1219 NW 83rd St Seattle, WA 98117 +1 206.650.3740 http://biosimilarity.blogspot.com --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups Lift group. To post to this group, send email to liftweb@googlegroups.com To unsubscribe from this group, send email to liftweb+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/liftweb?hl=en -~--~~~~--~~--~--~---
[Lift] Re: interaction with hibernate crowd?
Derek, Kris, Thanks. The problem is more subtle. i have modified my code emitter to not mark the field as final and to add the setter. i still get the same problem. However, i've got sample code derived from the emitted code that generates the correct schema. That is the key is used, not a tinyblob. Best wishes, --greg On Thu, Jun 18, 2009 at 3:07 PM, Derek Chen-Becker dchenbec...@gmail.comwrote: Is this final field something that is intended to be retrieved from the DB? As far as I know, JPA doesn't support final fields, period. If this getter is really just wrapping something else, it should be marked as @Transient. Derek On Thu, Jun 18, 2009 at 4:09 PM, Meredith Gregory lgreg.mered...@gmail.com wrote: Viktor, i finally got someone on the hibernate IRC channel to take a look at the problem. He claims that if he removes the final declarator from a field for which i have only a getter and then adds a setter hibernate works as advertised. i will test this out. If no joy i might take you up on your kind offer. Best wishes, --greg On Thu, Jun 18, 2009 at 1:10 PM, Viktor Klang viktor.kl...@gmail.comwrote: Gregory, send the available debug info regarding the suspected defect and I'll see what I can do. Viktor,Rogue Software Architect 18 jun 2009 kl. 21.24 Meredith Gregory lgreg.mered...@gmail.com skrev: Lifted and Scalata, Has anyone had any joy engaging the hibernate crowd? i've been trying every channel i can to get someone in the hibernate know to take a look at what i believe is a bug and no one even responds at all. Best wishes, --greg -- L.G. Meredith Managing Partner Biosimilarity LLC 1219 NW 83rd St Seattle, WA 98117 +1 206.650.3740 http://biosimilarity.blogspot.comhttp://biosimilarity.blogspot.com -- L.G. Meredith Managing Partner Biosimilarity LLC 1219 NW 83rd St Seattle, WA 98117 +1 206.650.3740 http://biosimilarity.blogspot.com -- L.G. Meredith Managing Partner Biosimilarity LLC 1219 NW 83rd St Seattle, WA 98117 +1 206.650.3740 http://biosimilarity.blogspot.com --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups Lift group. To post to this group, send email to liftweb@googlegroups.com To unsubscribe from this group, send email to liftweb+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/liftweb?hl=en -~--~~~~--~~--~--~---
[Lift] Re: scalajpa - while accessing two distincts databases, the second access is made with a connection to the first database
Oliver, The short answer is no. The longer answer is - i worked this all out on my own; so, you guys -- who can program lift on top of scala on top of JVM and are therefore about 20X smarter than i am -- can too. - And also, help is always available, if there is something specific you don't understand, let me know and i will do my best to convey it to you. Best wishes, --greg P.S. Here is a version of the paragraph with links to useful bits of lore from the literature. For myself, i was unhappy with the notion of name. The π-calculihttp://en.wikipedia.org/wiki/Pi-calculusand lambda calculi http://en.wikipedia.org/wiki/Lambda_calculus suffer a dependence on a notion of name. Both families of calculi require at least countably infinitely http://en.wikipedia.org/wiki/Countable many nameshttp://www.cs.nps.navy.mil/research/languages/statements/gordon.html, and a notion of equality on names. If names have no internal structure then these theories *cannot be effectivehttp://en.wikipedia.org/wiki/Computable_function *. The reasons is that the notion of equality must then be realized as an infinitary table which cannot fit in any computer we have access to. Therefore, in effective theories, names must have internal structure. Since they have internal structure and are at least countably infinite, one is in danger of undermining the foundational character of these proposals for computing. Therefore, the only possible solution is that the notion of structured name must come from the notion of program proposed by the model. This argument is airtight. If you want a foundational model of computing with nominal structure, the nominal structure must derive from the notion of computation being put forward, i.e. it must *reflect* the notion of computationhttp://svn.biosimilarity.com/src/open/papers/trunk/concurrency/rho/ex_nihilo_entcs/ex_nihilo_finco.pdf. This gives rise to all kinds of new an beautiful phenomena. One measure of your way into compositional thinking is whether this is happening. Is your approach to compositional thinking beginning to yield whole new aspects of computing, and new 'wholes' of computation, new forms of organization. 2009/6/16 Oliver Lambert olambo...@gmail.com 2009/6/17 Meredith Gregory lgreg.mered...@gmail.com Jeremy, Most excellent question award to you, sir! How to bootstrap thinking compositionally... this is what i did - learn some compositional idioms by heart - do you know the shape of the paradoxical combinator by heart - do you know the data making up a monad - do you know the data making up a distributive law between monads - use them in real world applications and see where they fail - when is calculating the least/greatest fixpoint of a recursive spec for a problem the suboptimal solution - when is a monad not the answer - when is an indexed form of composition inadequate - improve them - is it a situational improvement or - a fundamental improvement - see where the very programming model itself fails - is functional composition the only sort of composition - how is parallel composition like functional composition - is parallel composition easily represented in categorical composition - improve it - what is the view of the world in your notion of composition - play with new programming models - does your new notion of composition give rise to a whole generation of different models - invent new idioms in these models - what are the things these models naturally express - and teach them to someone who wishes to bootstrap thinking compositionally For myself, i was unhappy with the notion of name. The π-calculi and lambda calculi suffer a dependence on a notion of name. Both families of calculi require at least countably infinitely many names, and a notion of equality on names. If names have no internal structure then these theories *cannot be effective*. Do we need to do some sort of course to understand this language? The reasons is that the notion of equality must then be realized as an infinitary table which cannot fit in any computer we have access to. Therefore, in effective theories, names must have internal structure. Since they have internal structure and are at least countably infinite, one is in danger of undermining the foundational character of these proposals for computing. Therefore, the only possible solution is that the notion of structured name must come from the notion of program proposed by the model. This argument is airtight. If you want a foundational model of computing with nominal structure, the nominal structure must derive from the notion of computation being put forward, i.e. it must *reflect* the notion of computation. This gives rise to all kinds of new an beautiful phenomena. One measure of your way into compositional
[Lift] Re: scalajpa - while accessing two distincts databases, the second access is made with a connection to the first database
Tim, LOL! Derek, i'm amazed at all the good work you've done on lift. You're unstoppable! i trust that all understood i was having good fun. Best wishes, --greg On Wed, Jun 17, 2009 at 2:07 AM, TSP tim.pig...@optrak.co.uk wrote: In my own defense ... failed to realize the problem that would arise from defining the EM factory as a singleton Are you being honest here Derek? Was not the real problem that you failed to truly embrace the shape of the paradoxical combinator? -- L.G. Meredith Managing Partner Biosimilarity LLC 1219 NW 83rd St Seattle, WA 98117 +1 206.650.3740 http://biosimilarity.blogspot.com --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups Lift group. To post to this group, send email to liftweb@googlegroups.com To unsubscribe from this group, send email to liftweb+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/liftweb?hl=en -~--~~~~--~~--~--~---
[Lift] Re: scalajpa - while accessing two distincts databases, the second access is made with a connection to the first database
Oliver,
Objects and monads are really not the same. At it's heart the concept of
monad is an appropriately parametric notion of composition. If you have any
experience with abstract algebra, you might recognize that the notion of a
group http://en.wikipedia.org/wiki/Symmetry_group is an appropriately
parametric notion of symmetry. Groups give an exceptionally well abstracted
account of symmetry. Monads give an exceptionally well abstracted notion of
composition. This is a lot easier to see in the Category Theoretic
presentation.
A monad http://en.wikipedia.org/wiki/Monad_%28category_theory%29 is
presented by three pieces of data:
- An endofunctor http://en.wikipedia.org/wiki/Functor M : C - C
(intuitively, think of M as a parametric type constructor and C as the
universe of types and maps)
- A natural
transformationhttp://en.wikipedia.org/wiki/Natural_transformationunit:
Id - M -- this is a higher-order critter: it takes maps to maps; but
i'll give you a metaphor in just a moment.
- A natural transformation mult: M^2 - M
One picture you can have in your mind is M is a kind of box factory. Then
unit says how you can put things into a box, and mult says how you can
flatten nested boxes into an ordinary box (this is the origins of flatMap in
Scala's presentation). Another way of understanding this is that M is a kind
of higher-order compositor, i.e. a way of combining things just like
multiplication, as in a*b, is a way of combining things. Then the unit is
the analog of having a unit for your multiplication and mult is the analog
of an associativity law ( a*(b*c) = (a*b)*c ). These line up with the box
analogy more easily if you write things with prefix notation instead of
infix notation.
- Let's write {*| a, b |*} instead of a*b. The reason we adopt this more
verbose notation is that we can note the different kind of boxes with the
'color' of the braces. M-colored braces, {M| a, b |M}, are associated with
an M-box.
- Then unit( a ) = {M| a |M}, it puts a in an M-box. This has an
alternate presentation of the form {M| |M}.{M| a |M} = {M| a |M}. i mention
it to point out the analogy with the binary operation _*_, but it muddies
the water a little with begging the question about the _._. So, i will just
leave it -- without explanation -- for you to explore.
- And mult( {M| {M| a11, ..., a1J |M} ... {M| aI1, ... aIJ' |M} |M} ) =
{M| a11, ..., aIJ' |M}. It tells you how to canonically flatten M-boxes.
This functions as an association because if boxes canonically flatten, then
{M| a, {M| b, c |M} |M} = {M| a, b, c |M} = {M| {M| a, b |M}, c |M}.
The apparent lexical connection between this way of thinking about things
and XML *is not accidental*. Monads can be viewed as colored braces, aka
matched tags. Monads are a semantical creature that presents syntactically
like XML.
This way of thinking about things is really different from objects. To be
sure, there are notions of objects that are universal and so can be made to
fit or encode just about anything; but, that doesn't mean the encodings are
nice, or scalable or maintainable. You have only to to look at something
like LINQ -- which is really just a presentation of monads -- to see just
how flexible and yet compact the monadic way of structuring composition is.
Specifically, both set-comprehension notation and SELECT-FROM-WHERE, when
interpreted polymorphically, provide a natural representation of the monad.
- { pattern | t1 - generator1, ..., tn - generatorN, constraint1, ...,
constraintK }
- SELECT pattern FROM generator WHERE constraint
Those to pieces of computational machinery have very simple, and natural
mappings to the monad operations. You will win if you work these out for
yourself. Phil Wadler has excellent papers to provide cheat sheets. The
Scala for-comprehension and the corresponding operations of map, flatMap and
filter are also excellent cheat sheets. But, you get the joy if you work
this out for yourself.
Best wishes,
--greg
2009/6/17 Oliver Lambert olambo...@gmail.com
2009/6/18 Meredith Gregory lgreg.mered...@gmail.com
Oliver,
The short answer is no. The longer answer is
- i worked this all out on my own; so, you guys -- who can program
lift on top of scala on top of JVM and are therefore about 20X smarter
than
i am -- can too.
I think if we were all 20X (or 2X) smarter than you, we would have taken
over Google by now.
- And also, help is always available, if there is something specific
you don't understand, let me know and i will do my best to convey it to
you.
As suggested by another kind person, I may have to start by going back to
(an American?) school.
Heres a question, why should I care about Monad's when they are already in
OO, just not called Monads?
-
Best wishes,
--greg
P.S. Here is a version of the paragraph with links to useful bits of lore
from the literature.
For myself, i was unhappy
[Lift] Re: scalajpa - while accessing two distincts databases, the second access is made with a connection to the first database
Derek,
soapbox
You have just demonstrated a process that i have been talking about for the
last 15 years. People have a blind spot when it comes to thinking
compositionally. They think -- almost to a person -- about god's eye view
solutions where there's only one of some key solution component. They don't
think about solutions that are composed of ... (wait for it)... solutions!
It takes some serious training to think compositionally. Compositional
solutions, however, are the only realistic way to scale. When solutions are
compositional, you can *de*compose. The db example is a case in point. One
of the most natural ways to scale data access is sharding and partitioning
-- which requires upfront machinery to support decomposition of the store.
Lest you feel bad, note that some of the best scientific minds of all time
have fallen prey to this blind spot. Newtonian physics as well as Einstein's
update to Newton's proposal is a non-compositional solution. Quantum
mechanics also exhibits compositional failures. This is why physics is
failing to find proposals that link theories of gravitation (essentially
large scale) to quantum mechanical theories of the other forces (essentially
very small scale) -- the physical theories are non-compositional -- they
don't scale!
One of the real things functional programming has going for it is that the
basic model of computation underlying the means of structuring and
manipulating programs is compositional. That's why it is important to have a
technology like Scala resting atop the incumbent execution model (JVM) being
deployed on web-scale problems. Compositionality is the only way to tackle
applications at global scale.
/soapbox
Thanks for getting the fix to this problem in so quickly.
Best wishes,
--greg
On Tue, Jun 16, 2009 at 11:53 AM, Derek Chen-Becker
dchenbec...@gmail.comwrote:
Using multiple EMs was not something I had considered when I wrote this. I
think that I can modify the code to provide a __nameSalt def to
differentiate instances. Let me work on it and I'll have something soon.
Derek
On 6/16/09, Jean-Luc jlcane...@gmail.com wrote:
For your information, here is an extract of source code of RequestVarEM :
Trait RequestVarEM extends ScalaEntityManager with ScalaEMFactory {
object emVar extends RequestVar[EntityManager](openEM()) { ... }
}
EntityManager is stored in the singleton emVar; so, all db access of Model
objects are made using the singleton emVar.
= trait RequestVarEM allow only one connection to a database within the
same HttpRequest context.
Jean-Luc
2009/6/15 Jean-Luc jlcane...@gmail.com
Hello,
I have two databases, db1 (a.k.a. Motorbike) and db2 (a.k.a. Motorway)
defined with RequestVarEM :
- object ModelDb1 extends LocalEMF(db1) with RequestVarEM // Motorbike
database
- object ModelDb2 extends LocalEMF(db2) with RequestVarEM // Motorway
database
I thought one could access to any databases independently from any
snippet as long as the correct Model object were used (ModelDb1 or ModelDb2
for exemple) ; but when I access both databases from the same page, the
second database access issues a Named query not found exception.
I have two snippets, one to display a list of motorbike, another to
display a list of motorway :
- page1 :
ModelDb1.createNamedQuery[Motorbike](Motorbike.findAll).getResultList() =
ok
- page2
: ModelDb2.createNamedQuery[Motorway](Motorway.findAll).getResultList() =
ok
- page3 : calling from page 3 motorbike motorway snippets : Named query
not found: Motorway.findAll
- page4 : calling from page 4 motorway motorbike snippets : Named query
not found: Motorbike.findAll
- page3 changing the query of *Motorway* snippet :
-
ModelDb2.createNamedQuery[*Motorbike*](*Motorbike*.findAll).getResultList()
= it's ok and I do NOT have an exception !
I joined a sample application, ...
any idea about this issue ?
(bad use of LocalEMF in the application code ? issue with LocalEMF or
RequestVarEM ?)
Jean-Luc
PS :
I don't know if it's related but I have this in the log :
[INFO] Checking for multiple versions of scala
[WARNING] Multiple versions of scala libraries detected!
--
Jean-Luc Canela
jlcane...@gmail.com
--
Jean-Luc Canela
jlcane...@gmail.com
--
L.G. Meredith
Managing Partner
Biosimilarity LLC
1219 NW 83rd St
Seattle, WA 98117
+1 206.650.3740
http://biosimilarity.blogspot.com
--~--~-~--~~~---~--~~
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[Lift] Re: scalajpa - while accessing two distincts databases, the second access is made with a connection to the first database
Jeremy, Most excellent question award to you, sir! How to bootstrap thinking compositionally... this is what i did - learn some compositional idioms by heart - do you know the shape of the paradoxical combinator by heart - do you know the data making up a monad - do you know the data making up a distributive law between monads - use them in real world applications and see where they fail - when is calculating the least/greatest fixpoint of a recursive spec for a problem the suboptimal solution - when is a monad not the answer - when is an indexed form of composition inadequate - improve them - is it a situational improvement or - a fundamental improvement - see where the very programming model itself fails - is functional composition the only sort of composition - how is parallel composition like functional composition - is parallel composition easily represented in categorical composition - improve it - what is the view of the world in your notion of composition - play with new programming models - does your new notion of composition give rise to a whole generation of different models - invent new idioms in these models - what are the things these models naturally express - and teach them to someone who wishes to bootstrap thinking compositionally For myself, i was unhappy with the notion of name. The π-calculi and lambda calculi suffer a dependence on a notion of name. Both families of calculi require at least countably infinitely many names, and a notion of equality on names. If names have no internal structure then these theories *cannot be effective*. The reasons is that the notion of equality must then be realized as an infinitary table which cannot fit in any computer we have access to. Therefore, in effective theories, names must have internal structure. Since they have internal structure and are at least countably infinite, one is in danger of undermining the foundational character of these proposals for computing. Therefore, the only possible solution is that the notion of structured name must come from the notion of program proposed by the model. This argument is airtight. If you want a foundational model of computing with nominal structure, the nominal structure must derive from the notion of computation being put forward, i.e. it must *reflect* the notion of computation. This gives rise to all kinds of new an beautiful phenomena. One measure of your way into compositional thinking is whether this is happening. Is your approach to compositional thinking beginning to yield whole new aspects of computing, and new 'wholes' of computation, new forms of organization. Best wishes, --greg On Tue, Jun 16, 2009 at 7:31 PM, Jeremy Day jeremy@gmail.com wrote: Greg, On Tue, Jun 16, 2009 at 6:38 PM, Meredith Gregory lgreg.mered...@gmail.com wrote: It takes some serious training to think compositionally. No doubt it is extremely tough to think compositionally, and it's all too easy to fall back on non-compositional ways of thinking. In a similar vein it's all too easy to fall into procedural patterns when learning or working with functional programming in a multi-paradigm language. But what are good ways for programmers to learn to think compositionally and, more importantly, practice? Do you know of any books or online references that might help make the transition for anyone who is interested? Jeremy -- L.G. Meredith Managing Partner Biosimilarity LLC 1219 NW 83rd St Seattle, WA 98117 +1 206.650.3740 http://biosimilarity.blogspot.com --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups Lift group. To post to this group, send email to liftweb@googlegroups.com To unsubscribe from this group, send email to liftweb+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/liftweb?hl=en -~--~~~~--~~--~--~---
[Lift] Re: Wolfram Alpha integration for Lift
Tim, Thanks for the prompt. Can you point me to a description of what's possible with W|A? i can put together a draft that you can then rev. Best wishes, --greg On Fri, Jun 12, 2009 at 6:26 AM, Timothy Perrett timo...@getintheloop.euwrote: Greg, If you have any thoughts on effective ways to model this query grammar id be interested in your thoughts :-) Cheers, Tim On Jun 11, 10:38 pm, Meredith Gregory lgreg.mered...@gmail.com wrote: All, Thanks for all this input. It certainly helps me see the value-prop better. Best wishes, --greg On Thu, Jun 11, 2009 at 2:07 PM, Kris Nuttycombe kris.nuttyco...@gmail.comwrote: I sort of see Wolfram Alpha as simply an incredibly sophisticated calculator instead of an information discovery tool. What were you trying to compute about polyadic pi-calculus? Alpha seems to be trying to put all sorts of different kinds of data into a common, hugely high-dimensional space so that you can perform computations on it, where your computations are expressed in a mix of mathematical and natural language. There are certainly a lot of things that it's not useful for yet, but it's a tremendously interesting problem. Kris On Thu, Jun 11, 2009 at 12:42 PM, Meredith Gregorylgreg.mered...@gmail.com wrote: Tim, Thanks for the response. i'll have to noodle on that one. Off the top of my head, i'm usually in this loop Initially, usually badly formulated question Get information sources Reformulate question Loop So, i don't really see much difference between the two, except by use. i will think about it, though. Best wishes, --greg -- L.G. Meredith Managing Partner Biosimilarity LLC 1219 NW 83rd St Seattle, WA 98117 +1 206.650.3740 http://biosimilarity.blogspot.com -- L.G. Meredith Managing Partner Biosimilarity LLC 1219 NW 83rd St Seattle, WA 98117 +1 206.650.3740 http://biosimilarity.blogspot.com --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups Lift group. To post to this group, send email to liftweb@googlegroups.com To unsubscribe from this group, send email to liftweb+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/liftweb?hl=en -~--~~~~--~~--~--~---
[Lift] Re: Wolfram Alpha integration for Lift
Tim,
Could you enlighten me on the coolness of Wolfram Alpha? My initial forays
and comparison to Google were depressingly unfavorable, but excellent if
you're looking for some humor. See the summary below.
Best wishes,
--greg
My standard test of a search engine: polyadic pi-calculus
Google result: first hit is the Edinburgh tutorial prepared by Milner, still
the best reference
Wolfram Alpha: *Wolfram|Alpha isn't sure what to do with your input.
Related inputs to try: pi.*
This test, by the way, should be right in W|A's sweet spot.
My next test: phred weasley
Google result: Did you mean: *fred*
weasleyhttp://www.google.ca/search?hl=enclient=firefox-arls=org.mozilla:en-US:officialhs=ePUei=T0gxSvHvF8nRjAfzn5S2Bwsa=Xoi=spellresnum=0ct=resultcd=1q=fred+weasleyspell=1and
then several links to Harry Potter
W|A result: *Wolfram|Alpha isn't sure what to do with your input. Related
inputs to try: Wesley.*
My next test: fred weasley
Google result: the top Harry Potter sites
W|A result:
Interpreting weasley as wesley
--
--
Assuming Fred (female) | Use Fred
(male)javascript:applyAssumption(1,'*DPClash.GivenNameE.fred-_*FredUnitedStatesMaleName-')instead
--
--
--
Input interpretation:[image: Fred (female given name) | Wesley (male given
name)]
--
--
Latest information for US births:[image: | Fred | Wesley\nrank | 985th
(1929) | 194th (2008)\nfraction | 1 in 21277 people (0.0047%) (1929) | 1 in
1058 people (0.094%) (2008)\nnumber | 54 people per year (1929) | 2033
people per year (2008)]
--
--
History for US births:Log
scalejavascript:asynchronousPod('pod.jsp?id=MSP41119646i0hb5a62fg04fe211d660aid2aas=61',%20'0300','fred+weasley','',0)
Morejavascript:asynchronousPod('pod.jsp?id=MSP41219646i0hb5a62fg058i0506e54df6b4es=61',%20'0300','fred+weasley','',0)
Fraction:[image: Fraction]
On Thu, Jun 11, 2009 at 10:35 AM, Timothy Perrett
timo...@getintheloop.euwrote:
Hey Ty,
Essentially the wolfram API is a REST / XMLRPC hybrid, so my plan is
to model a scala abstraction around Apache HTTP (similar to the paypal
integration) - speaking of which, i might actually abstract some of
the common factories out of lift-paypal into lift-util if applicable.
The interesting challenge will be that with wolfram, it can return a
whole bunch of things, they could be graphs, text, sound - so i'll
need some abstract way of making that presentable - perhaps some
decoupled thing with a core communication group, then some lift
specific abstractions for hooking into bind() or something...
I've not figured it out yet in my head, so any thoughts are most
welcome.
Cheers, Tim
On Jun 11, 6:16 pm, TylerWeir tyler.w...@gmail.com wrote:
Sounds cool, I agree that there is much awesome in Alpha.
How do you see this integration planning out?
On Jun 11, 12:02 pm, Timothy Perrett timo...@getintheloop.eu wrote:
Hey chaps,
Im going to start work on integration with the wolfram alpha engine
that i've of late become most obsessed with as its the coolest thing
since sliced bread...http://www.wolframalpha.com/
New branch here:
http://github.com/dpp/liftweb/tree/wip-tim-wolframalpha
Anyone else in the commit team interested in working on this with me?
Cheers, Tim
--
L.G. Meredith
Managing Partner
Biosimilarity LLC
1219 NW 83rd St
Seattle, WA 98117
+1 206.650.3740
http://biosimilarity.blogspot.com
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[Lift] Re: Wolfram Alpha integration for Lift
Tim,
Thanks for the response. i'll have to noodle on that one. Off the top of my
head, i'm usually in this loop
- Initially, usually badly formulated question
- Get information sources
- Reformulate question
- Loop
So, i don't really see much difference between the two, except by use. i
will think about it, though.
Best wishes,
--greg
On Thu, Jun 11, 2009 at 11:31 AM, Timothy Perrett
timo...@getintheloop.euwrote:
Hey Greg,
Im not sure that drawing comparisons to google is right? IMO, they
dont do the same job...? I see why one would see similarities, but
isnt google's purpose to find the sources of information, where as
wolfram's aim is to provide an objective set of answers based on
human input;
http://www.wolframalpha.com/about.html
Cheers, Tim
On Jun 11, 7:14 pm, Meredith Gregory lgreg.mered...@gmail.com wrote:
Tim,
Could you enlighten me on the coolness of Wolfram Alpha? My initial
forays
and comparison to Google were depressingly unfavorable, but excellent if
you're looking for some humor. See the summary below.
Best wishes,
--greg
My standard test of a search engine: polyadic pi-calculus
Google result: first hit is the Edinburgh tutorial prepared by Milner,
still
the best reference
Wolfram Alpha: *Wolfram|Alpha isn't sure what to do with your input.
Related inputs to try: pi.*
This test, by the way, should be right in W|A's sweet spot.
My next test: phred weasley
Google result: Did you mean: *fred*
weasley
http://www.google.ca/search?hl=enclient=firefox-arls=org.mozilla:en..
.and
then several links to Harry Potter
W|A result: *Wolfram|Alpha isn't sure what to do with your input.
Related
inputs to try: Wesley.*
My next test: fred weasley
Google result: the top Harry Potter sites
W|A result:
Interpreting weasley as wesley
--
--
Assuming Fred (female) | Use Fred
(male)javascript:applyAssumption(1,'*DPClash.GivenNameE.fred-_*FredUnitedS
tatesMaleName-')instead
--
--
--
Input interpretation:[image: Fred (female given name) | Wesley (male
given
name)]
--
--
Latest information for US births:[image: | Fred | Wesley\nrank | 985th
(1929) | 194th (2008)\nfraction | 1 in 21277 people (0.0047%) (1929) | 1
in
1058 people (0.094%) (2008)\nnumber | 54 people per year (1929) | 2033
people per year (2008)]
--
--
History for US births:Log
scalejavascript:asynchronousPod('pod.jsp?id=MSP41119646i0hb5a62fg04fe2
11d660aid2aas=61',%20'0300','fred+weasley','',0)
Morejavascript:asynchronousPod('pod.jsp?id=MSP41219646i0hb5a62fg058i05
06e54df6b4es=61',%20'0300','fred+weasley','',0)
Fraction:[image: Fraction]
On Thu, Jun 11, 2009 at 10:35 AM, Timothy Perrett
timo...@getintheloop.euwrote:
Hey Ty,
Essentially the wolfram API is a REST / XMLRPC hybrid, so my plan is
to model a scala abstraction around Apache HTTP (similar to the paypal
integration) - speaking of which, i might actually abstract some of
the common factories out of lift-paypal into lift-util if applicable.
The interesting challenge will be that with wolfram, it can return a
whole bunch of things, they could be graphs, text, sound - so i'll
need some abstract way of making that presentable - perhaps some
decoupled thing with a core communication group, then some lift
specific abstractions for hooking into bind() or something...
I've not figured it out yet in my head, so any thoughts are most
welcome.
Cheers, Tim
On Jun 11, 6:16 pm, TylerWeir tyler.w...@gmail.com wrote:
Sounds cool, I agree that there is much awesome in Alpha.
How do you see this integration planning out?
On Jun 11, 12:02 pm, Timothy Perrett timo...@getintheloop.eu
wrote:
Hey chaps,
Im going to start work on integration with the wolfram alpha engine
that i've of late become most obsessed with as its the coolest
thing
since sliced bread...http://www.wolframalpha.com/
New branch here:
http://github.com/dpp/liftweb/tree/wip-tim-wolframalpha
Anyone else in the commit team interested in working on this with
me?
Cheers, Tim
--
L.G. Meredith
Managing Partner
Biosimilarity LLC
1219 NW 83rd St
Seattle, WA 98117
+1 206.650.3740
http://biosimilarity.blogspot.com
--
L.G. Meredith
Managing Partner
Biosimilarity LLC
1219 NW 83rd St
Seattle, WA 98117
+1 206.650.3740
http://biosimilarity.blogspot.com
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[Lift] Re: lift stress tests and comet
David, Many thanks for the quick response. Is the test set up available anywhere? i'd like to see what the major differences are. We're using comet with Jetty. Best wishes, --greg On Thu, Jun 11, 2009 at 11:19 AM, David Pollak feeder.of.the.be...@gmail.com wrote: On Thu, Jun 11, 2009 at 11:02 AM, Meredith Gregory lgreg.mered...@gmail.com wrote: Lifted, i know that DPP has done some extensive lift stress testing. i'm wondering how comet has been exercised in that testing. We're seeing comet fall over in a load situation that would not be acceptable for production. We'd like to suss out how/why this is happening and whether we can work around it. Does anyone have any hard test data for comet? What app server are you using? I've did a comet test last year with Jetty serving 700 pages/sec to 2,250 sessions and did not notice significant issues. I haven't done stress testing since then. Best wishes, --greg -- L.G. Meredith Managing Partner Biosimilarity LLC 1219 NW 83rd St Seattle, WA 98117 +1 206.650.3740 http://biosimilarity.blogspot.com -- Lift, the simply functional web framework http://liftweb.net Beginning Scala http://www.apress.com/book/view/1430219890 Follow me: http://twitter.com/dpp Git some: http://github.com/dpp -- L.G. Meredith Managing Partner Biosimilarity LLC 1219 NW 83rd St Seattle, WA 98117 +1 206.650.3740 http://biosimilarity.blogspot.com --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups Lift group. To post to this group, send email to liftweb@googlegroups.com To unsubscribe from this group, send email to liftweb+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/liftweb?hl=en -~--~~~~--~~--~--~---
[Lift] maven question
Lifted, Spse you've got a maven plugin configured with multiple executions in the same life-cycle phase, distinguished by id. How do you invoke one of them by id? For example, suppose i've got the maven-exec-plugin configured with two executions in the package phase, with ids, 'one' and 'two', respectivelys. What's the maven command line invocation that allows me to execute one without the other? Best wishes, --greg -- L.G. Meredith Managing Partner Biosimilarity LLC 1219 NW 83rd St Seattle, WA 98117 +1 206.650.3740 http://biosimilarity.blogspot.com --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups Lift group. To post to this group, send email to liftweb@googlegroups.com To unsubscribe from this group, send email to liftweb+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/liftweb?hl=en -~--~~~~--~~--~--~---
[Lift] Re: lift stress tests and comet
David, Btw, i don't see a use of the Bayeux lib in lift, but want to double check that it's not being used. Best wishes, --greg On Thu, Jun 11, 2009 at 11:44 AM, Meredith Gregory lgreg.mered...@gmail.com wrote: David, Many thanks for the quick response. Is the test set up available anywhere? i'd like to see what the major differences are. We're using comet with Jetty. Best wishes, --greg On Thu, Jun 11, 2009 at 11:19 AM, David Pollak feeder.of.the.be...@gmail.com wrote: On Thu, Jun 11, 2009 at 11:02 AM, Meredith Gregory lgreg.mered...@gmail.com wrote: Lifted, i know that DPP has done some extensive lift stress testing. i'm wondering how comet has been exercised in that testing. We're seeing comet fall over in a load situation that would not be acceptable for production. We'd like to suss out how/why this is happening and whether we can work around it. Does anyone have any hard test data for comet? What app server are you using? I've did a comet test last year with Jetty serving 700 pages/sec to 2,250 sessions and did not notice significant issues. I haven't done stress testing since then. Best wishes, --greg -- L.G. Meredith Managing Partner Biosimilarity LLC 1219 NW 83rd St Seattle, WA 98117 +1 206.650.3740 http://biosimilarity.blogspot.com -- Lift, the simply functional web framework http://liftweb.net Beginning Scala http://www.apress.com/book/view/1430219890 Follow me: http://twitter.com/dpp Git some: http://github.com/dpp -- L.G. Meredith Managing Partner Biosimilarity LLC 1219 NW 83rd St Seattle, WA 98117 +1 206.650.3740 http://biosimilarity.blogspot.com -- L.G. Meredith Managing Partner Biosimilarity LLC 1219 NW 83rd St Seattle, WA 98117 +1 206.650.3740 http://biosimilarity.blogspot.com --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups Lift group. To post to this group, send email to liftweb@googlegroups.com To unsubscribe from this group, send email to liftweb+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/liftweb?hl=en -~--~~~~--~~--~--~---
[Lift] Re: Wolfram Alpha integration for Lift
All, Thanks for all this input. It certainly helps me see the value-prop better. Best wishes, --greg On Thu, Jun 11, 2009 at 2:07 PM, Kris Nuttycombe kris.nuttyco...@gmail.comwrote: I sort of see Wolfram Alpha as simply an incredibly sophisticated calculator instead of an information discovery tool. What were you trying to compute about polyadic pi-calculus? Alpha seems to be trying to put all sorts of different kinds of data into a common, hugely high-dimensional space so that you can perform computations on it, where your computations are expressed in a mix of mathematical and natural language. There are certainly a lot of things that it's not useful for yet, but it's a tremendously interesting problem. Kris On Thu, Jun 11, 2009 at 12:42 PM, Meredith Gregorylgreg.mered...@gmail.com wrote: Tim, Thanks for the response. i'll have to noodle on that one. Off the top of my head, i'm usually in this loop Initially, usually badly formulated question Get information sources Reformulate question Loop So, i don't really see much difference between the two, except by use. i will think about it, though. Best wishes, --greg -- L.G. Meredith Managing Partner Biosimilarity LLC 1219 NW 83rd St Seattle, WA 98117 +1 206.650.3740 http://biosimilarity.blogspot.com --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups Lift group. To post to this group, send email to liftweb@googlegroups.com To unsubscribe from this group, send email to liftweb+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/liftweb?hl=en -~--~~~~--~~--~--~---
[Lift] Re: JTA Transaction Monad - Early Access Program
Lifted,
i gotta say this thread of activity is just so cool. It's what i always
dreamed open source would be like. The community essentially gets to access
and think with each others' best minds and act with each others' best
talents to arrive on a path to a better concrete realization of feature,
function and design. We all know, individually and collectively, just how
hard it is to make excellent software and know that we're more likely to
achieve that aim working together. i can't help but notice that there is no
explicit representation of the profit motive here. Each of us might
individually be in contact with some aspect of profit motive, but it does
not have an explicit representation in this little snippet of process. That
gives this entrepreneur pause for thought.
Best wishes,
--greg
On Tue, Jun 9, 2009 at 3:46 PM, David Pollak
feeder.of.the.be...@gmail.comwrote:
On Tue, Jun 9, 2009 at 1:08 PM, Jonas Bonér jbo...@gmail.com wrote:
Now I have deleted the lib dir with all jars and fixed the POM.
Thanks!
2009/6/9 Derek Chen-Becker dchenbec...@gmail.com:
In my email above I have the link to the Maven artifacts for Atomikos:
http://mvnrepository.com/artifact/com.atomikos
I think that the dependency you want is:
dependency
groupIdcom.atomikos/groupId
artifactIdtransactions-jta/artifactId
version3.2.3/version
/dependency
Derek
On Tue, Jun 9, 2009 at 12:54 PM, Meredith Gregory
lgreg.mered...@gmail.com
wrote:
Jonas,
Awesome! i look forward to digging into this stuff!
Best wishes,
--greg
On Tue, Jun 9, 2009 at 6:18 AM, Jonas Bonér jbo...@gmail.com wrote:
Hey guys.
I have hacked together an early draft of the JTA transaction stuff.
I have wrapped it up in a monad. Here are some examples of usage:
for {
ctx - TransactionContext.Required
entity - updatedEntities
if !ctx.isRollbackOnly
} {
// transactional stuff
ctx.getEntityManager.merge(entity)
}
val users = for {
ctx - TransactionContext.Required
name - userNames
} yield {
// transactional stuff
val query = ctx.getEntityManager.createNamedQuery(findUserByName)
query.setParameter(userName, name)
query.getSingleResult
}
If you don't like the monadic approach you can just use the high-order
functions:
TransactionContext.withTxRequired {
... // REQUIRED semantics
TransactionContext.withTxRequiresNew {
... // REQUIRES_NEW semantics
}
}
I have implemented the same semantics as used in the EJB spec.
Required, RequiresNew, Mandatory, Supports, Never. All these are
monadic objects in the TransactionContext object.
I don't have a webapp to try this out, so I would be happy to get all
kinds of feedback, but API wise and bug reports or fixes.
This API is hooked into Derek's Scala-JPA stuff. I had my own impl of
this but replaced it with Derek's work.
Derek,
please go through the integration to see if I have done it correctly,
and where things code be improved.
All committers,
feel free to hack and change this code anyway you want.
The code is in a branch (wip-jta-jonas), you can find it here:
http://github.com/dpp/liftweb/tree/3783b9e2200cc57dd72baa1bd8cabdb1365ee923/lift-jta
Check the ScalaDoc (or the source) for the documentation on usage,
semantics etc.
Also see the README for configuration in persistence.xml etc.
Currently it is hard-coded to use the Atomikos Transaction library and
Hibernate JPA, that would have to be configurable + some other options
as well. See the TODOs in the code.
As I said, this needs feedback and testing. Thanks.
--
Jonas Bonér
twitter: @jboner
blog:http://jonasboner.com
work: http://crisp.se
work: http://scalablesolutions.se
code: http://github.com/jboner
--
L.G. Meredith
Managing Partner
Biosimilarity LLC
1219 NW 83rd St
Seattle, WA 98117
+1 206.650.3740
http://biosimilarity.blogspot.com
--
Jonas Bonér
twitter: @jboner
blog:http://jonasboner.com
work: http://crisp.se
work: http://scalablesolutions.se
code: http://github.com/jboner
--
Lift, the simply functional web framework http://liftweb.net
Beginning Scala http://www.apress.com/book/view/1430219890
Follow me: http://twitter.com/dpp
Git some: http://github.com/dpp
--
L.G. Meredith
Managing Partner
Biosimilarity LLC
1219 NW 83rd St
Seattle, WA 98117
+1 206.650.3740
http://biosimilarity.blogspot.com
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[Lift] Re: JTA Transaction Monad - Early Access Program
Jonas,
Awesome! i look forward to digging into this stuff!
Best wishes,
--greg
On Tue, Jun 9, 2009 at 6:18 AM, Jonas Bonér jbo...@gmail.com wrote:
Hey guys.
I have hacked together an early draft of the JTA transaction stuff.
I have wrapped it up in a monad. Here are some examples of usage:
for {
ctx - TransactionContext.Required
entity - updatedEntities
if !ctx.isRollbackOnly
} {
// transactional stuff
ctx.getEntityManager.merge(entity)
}
val users = for {
ctx - TransactionContext.Required
name - userNames
} yield {
// transactional stuff
val query = ctx.getEntityManager.createNamedQuery(findUserByName)
query.setParameter(userName, name)
query.getSingleResult
}
If you don't like the monadic approach you can just use the high-order
functions:
TransactionContext.withTxRequired {
... // REQUIRED semantics
TransactionContext.withTxRequiresNew {
... // REQUIRES_NEW semantics
}
}
I have implemented the same semantics as used in the EJB spec.
Required, RequiresNew, Mandatory, Supports, Never. All these are
monadic objects in the TransactionContext object.
I don't have a webapp to try this out, so I would be happy to get all
kinds of feedback, but API wise and bug reports or fixes.
This API is hooked into Derek's Scala-JPA stuff. I had my own impl of
this but replaced it with Derek's work.
Derek,
please go through the integration to see if I have done it correctly,
and where things code be improved.
All committers,
feel free to hack and change this code anyway you want.
The code is in a branch (wip-jta-jonas), you can find it here:
http://github.com/dpp/liftweb/tree/3783b9e2200cc57dd72baa1bd8cabdb1365ee923/lift-jta
Check the ScalaDoc (or the source) for the documentation on usage,
semantics etc.
Also see the README for configuration in persistence.xml etc.
Currently it is hard-coded to use the Atomikos Transaction library and
Hibernate JPA, that would have to be configurable + some other options
as well. See the TODOs in the code.
As I said, this needs feedback and testing. Thanks.
--
Jonas Bonér
twitter: @jboner
blog:http://jonasboner.com
work: http://crisp.se
work: http://scalablesolutions.se
code: http://github.com/jboner
--
L.G. Meredith
Managing Partner
Biosimilarity LLC
1219 NW 83rd St
Seattle, WA 98117
+1 206.650.3740
http://biosimilarity.blogspot.com
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[Lift] Re: JTA
Jonas,
i just got back from a week of Guitar on Raft Island. So, i just saw this
message. If you want any help, design review, code review, peanuts from the
peanut gallery, just give me a shout. Also, i wanted to reiterate that i
think you can also provide an annotation-style solution over the top of a
monadic solution -- which i think would solve some concerns Josh might have
raised (if my music-addled brain has grasped them). i'm looking forward to
see what you come up with.
Best wishes,
--greg
On Sat, May 30, 2009 at 1:15 PM, Jonas Bonér jbo...@gmail.com wrote:
Thanks a lot Greg.
That's sounds like a great idea. I'll see what I can come up with.
/Jonas
2009/5/30 Meredith Gregory lgreg.mered...@gmail.com:
Jonas,
i applaud the effort. i agree with DPP sentiments regarding annotations.
That said, i feel pretty comfortable that transactions fit entirely in a
monadic context. Since LINQ demonstrates that query fits into monadic
context, and there's already at least one Scala implementation of LINQ,
might i suggest that you come up with a monadic presentation first and
then
map the sugar to that. My guess is that the sugar will be informed by the
monadic presentation.
To be suggestive... think of a context with a Tx object, TxCtxt, as like
an
Option widget. Then you do stuff inside a transaction via
for ( myTransactedWidget - TxCtxt if someCondition ) yield {
someOperationsThatNeedToBeTransacted }
If you implement flatMap, yada, on TxCtxt you can have fun with nested
transaction semantics. The point is that this should just work with a
LINQ-like presentation of query.
Best wishes,
--greg
On Fri, May 29, 2009 at 6:54 AM, Jonas Bonér jbo...@gmail.com wrote:
I'll go for closures. Much simpler and less intrusive into Lift.
The current impl is based on Atomikos and Hibernate, I'll start with
pushing that in and we can make it pluggable later.
For example for Hibernate one need to add a line to the hibernate
config to register the
org.hibernate.transaction.TransactionManagerLookup class in order to
make Hibernate aware of our TX manager.
Should I fork the github repo and submit patches or how do you guys
work?
/Jonas
2009/5/29 Derek Chen-Becker dchenbec...@gmail.com:
I'd vote for closures. We use annotations for JPA because we have to,
but
IMHO closures provide a nicer semantic approach because they
syntactically
enclose the block where the action is occurring.
Derek
On Fri, May 29, 2009 at 7:44 AM, Jonas Bonér jbo...@gmail.com
wrote:
No perf difference. The annotations are turned into the same exact
closures.
2009/5/29 Timothy Perrett timo...@getintheloop.eu:
Are there any performance implications considering closures vs
annotations?
Agreed that closures are more lift like however.
Cheers, Tim
On 29/05/2009 10:21, marius d. marius.dan...@gmail.com wrote:
I think that would be really good. But I'd rather not use
annotations.
Personally I find closures approach a much better fit here.
withTxRequired {
... // do transational stuff
}
Br's,
Marius
On May 29, 11:55 am, Jonas Bonér jbo...@gmail.com wrote:
Hi guys.
I have been talking with David Pollak the rest of the lift team
about
adding JTA to Lift. I have implemented that for a product written
in
Scala some time ago. Now some of that code is OSS
at:http://github.com/jboner/skalman/tree
We used using two different APIs.
1. Annotations (would require Lift to support proxied objects,
e.g.
grab them from a factory):
@TransactionAttribute(REQUIRED)
def transactionalMethod = { ... }
2. Call-by-name:
withTxRequired {
... // do transational stuff
}
But I don't know what fits Lift and would like to know how you
guys
would like to have JTA integrated.
At which level? Which APIs? Etc.
--
Jonas Bonér
twitter: @jboner
blog:http://jonasboner.com
work: http://crisp.se
work: http://scalablesolutions.se
code: http://github.com/jboner
--
Jonas Bonér
twitter: @jboner
blog:http://jonasboner.com
work: http://crisp.se
work: http://scalablesolutions.se
code: http://github.com/jboner
--
Jonas Bonér
twitter: @jboner
blog:http://jonasboner.com
work: http://crisp.se
work: http://scalablesolutions.se
code: http://github.com/jboner
--
L.G. Meredith
Managing Partner
Biosimilarity LLC
1219 NW 83rd St
Seattle, WA 98117
+1 206.650.3740
http://biosimilarity.blogspot.com
--
Jonas Bonér
twitter: @jboner
blog:http://jonasboner.com
work: http://crisp.se
work: http://scalablesolutions.se
code: http://github.com/jboner
--
L.G. Meredith
[Lift] LiftOff
David, i didn't realize the LiftOff conflicted with a long-planned participation in a Guitar Craft course. i will definitely send good will and good wishes to the community. i'm certain you guys will have much too much fun. Maybe i can organize some kind of functional-computing-and-the-web event in the Pacific Northwest in the not too distant future, so that i can catch up with everybody. Best wishes, --greg -- L.G. Meredith Managing Partner Biosimilarity LLC 1219 NW 83rd St Seattle, WA 98117 +1 206.650.3740 http://biosimilarity.blogspot.com --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups Lift group. To post to this group, send email to liftweb@googlegroups.com To unsubscribe from this group, send email to liftweb+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/liftweb?hl=en -~--~~~~--~~--~--~---
[Lift] Re: How important is AJAX to you?
Joe, i love questions like this: 'what are the real requirements?' i have no particular interest in technology like AJAX -- except as a means to an end. i need to be able to build sites that are the web's equivalent of CSCW apps from the late 80s/early 90s. In the web apps i'm working on users have an experience of sharing a common space to design and edit complex computational models and large, rich data sets. One can imagine all sorts of technologies to do this on the existing web infrastructure. The real issue is not having to reinvent a bunch of stuff in order to remain focused on the very hard problems of providing the stuff above. AJAX took off. That fact that it got embodied in a bunch of unmaintainable crap like JavaScript -- well i'll ride that wave for a while. Frameworks like Lift can alleviate some of the problem, but you really need a good, statically typed language on the client side. A few people are beginning to take this problem on. It'd be great to see a ScalaScript for rich client-side experiences. Best wishes, --greg On Fri, May 29, 2009 at 10:36 AM, Charles F. Munat c...@munat.com wrote: Lift makes AJAX easy, but Lift has nothing to do with AJAX. Lift makes a lot of things easy. I've built half a dozen sites in Lift so far, with several more in the works, and most of them use no AJAX at all. That said, there is a lot to be said for AJAX when used properly. I think you're way off on that. The problem is (as with pretty much everything else on the Web), it's rarely used properly. Google does it mostly right. Facebook is mostly a mess. Chas. Joe Wass wrote: This may be heresy on this list, but I'll ask it anyway. A general point for discussion which I'm raising because the Lift Book mentions AJAX early on in the PocketChange app. How important is AJAX and all the associated Web 2.0 stuff to you and to your projects? I'm quite happy without Javascript and AJAX. More often than not they're doing the kind of thing you could just as easily do with traditional technologies. Save for one web-app (Google Mail), I don't think a single site I use has been improved for it. Particular examples are Slashdot and Facebook. Give me good old HTML any day. I've got a few projects in the pipeline and I intend to use Lift for all of them, it looks excellent and from the source I've read very nicely engineered. But I will expressly avoid using anything other than old-fashioned HTML as much as I can, largely because I'm targetting browsers of unknown vintage in less economically developed countries and I'd like to be able to use my own site without cookies or javascript if I want to. Have I missed the point of Lift entirely? Am I in a small minority? Am I crazy? Joe -- L.G. Meredith Managing Partner Biosimilarity LLC 1219 NW 83rd St Seattle, WA 98117 +1 206.650.3740 http://biosimilarity.blogspot.com --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups Lift group. To post to this group, send email to liftweb@googlegroups.com To unsubscribe from this group, send email to liftweb+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/liftweb?hl=en -~--~~~~--~~--~--~---
[Lift] project stockholm update
All, The latest version in github now successfully generates SQL persistence layer from the BNF. - git clone git://github.com/leithaus/stockholm.git - mvn clean compile process-classes process-classes Note bene: the process-classes goal currently needs to be called twice to generate the DDL scripts. Unfortunately, currently the persistence layer has to duplicate the abstract syntax class structure. The visitor to transform the abstract syntax classes to the persisted versions is not currently generated. It's easy to write, but it will be auto-generated in subsequent versions. Best wishes, --greg -- L.G. Meredith Managing Partner Biosimilarity LLC 1219 NW 83rd St Seattle, WA 98117 +1 206.650.3740 http://biosimilarity.blogspot.com --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups Lift group. To post to this group, send email to liftweb@googlegroups.com To unsubscribe from this group, send email to liftweb+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/liftweb?hl=en -~--~~~~--~~--~--~---
[Lift] Re: project stockholm update
All, And i've added basic support for messaging with JSON over Rabbit. Best wishes, --greg On Wed, May 27, 2009 at 5:04 AM, Meredith Gregory lgreg.mered...@gmail.comwrote: All, The latest version in github now successfully generates SQL persistence layer from the BNF. - git clone git://github.com/leithaus/stockholm.git - mvn clean compile process-classes process-classes Note bene: the process-classes goal currently needs to be called twice to generate the DDL scripts. Unfortunately, currently the persistence layer has to duplicate the abstract syntax class structure. The visitor to transform the abstract syntax classes to the persisted versions is not currently generated. It's easy to write, but it will be auto-generated in subsequent versions. Best wishes, --greg -- L.G. Meredith Managing Partner Biosimilarity LLC 1219 NW 83rd St Seattle, WA 98117 +1 206.650.3740 http://biosimilarity.blogspot.com -- L.G. Meredith Managing Partner Biosimilarity LLC 1219 NW 83rd St Seattle, WA 98117 +1 206.650.3740 http://biosimilarity.blogspot.com --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups Lift group. To post to this group, send email to liftweb@googlegroups.com To unsubscribe from this group, send email to liftweb+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/liftweb?hl=en -~--~~~~--~~--~--~---
[Lift] JPA woes
Lifted,
This little method
def handle( db : String )( contents: String ) : Unit = {
var obj : java.lang.Object = null;
try {
obj =
new XStream(
new JettisonMappedXmlDriver()
).fromXML( contents );
try {
entityManager( db ).getTransaction().begin();
entityManager( db ).persist( obj );
entityManager( db ).getTransaction().commit();
}
catch {
case e = {
println( persistence error )
e.printStackTrace
}
}
}
catch {
case e = {
println( marshaling error )
e.printStackTrace
}
}
}
is resulting in this stack trace
scala res8.handle( stockholm )( res3.toXML( res5 ) )
res8.handle( stockholm )( res3.toXML( res5 ) )
res8.handle( stockholm )( res3.toXML( res5 ) )
log4j:WARN No appenders could be found for logger
(org.hibernate.cfg.annotations.Version).
log4j:WARN Please initialize the log4j system properly.
persistence error
javax.persistence.PersistenceException:
org.hibernate.exception.SQLGrammarException: Cannot open connection
at
org.hibernate.ejb.AbstractEntityManagerImpl.throwPersistenceException(AbstractEntityManagerImpl.java:637)
at org.hibernate.ejb.TransactionImpl.begin(TransactionImpl.java:41)
at
net.liftweb.amqp.JSONToSQLHandler$class.handle(JSONAMQPDispatcher.scala:80)
at
net.liftweb.amqp.JSONAMQPListener$JSONListener.handle(JSONAMQPDispatcher.scala:118)
...
Best wishes,
--greg
--
L.G. Meredith
Managing Partner
Biosimilarity LLC
1219 NW 83rd St
Seattle, WA 98117
+1 206.650.3740
http://biosimilarity.blogspot.com
--~--~-~--~~~---~--~~
You received this message because you are subscribed to the Google Groups
Lift group.
To post to this group, send email to liftweb@googlegroups.com
To unsubscribe from this group, send email to
liftweb+unsubscr...@googlegroups.com
For more options, visit this group at
http://groups.google.com/group/liftweb?hl=en
-~--~~~~--~~--~--~---
[Lift] Re: JPA woes
Lifted,
Whoops -- hit send too soon.
Has anyone seen this sort of thing before? i'm guessing it's a common
problem. But i'm not clear on what's causing it and my google-fu is failing
me. ;-(
Best wishes,
--greg
On Wed, May 27, 2009 at 11:22 AM, Meredith Gregory lgreg.mered...@gmail.com
wrote:
Lifted,
This little method
def handle( db : String )( contents: String ) : Unit = {
var obj : java.lang.Object = null;
try {
obj =
new XStream(
new JettisonMappedXmlDriver()
).fromXML( contents );
try {
entityManager( db ).getTransaction().begin();
entityManager( db ).persist( obj );
entityManager( db ).getTransaction().commit();
}
catch {
case e = {
println( persistence error )
e.printStackTrace
}
}
}
catch {
case e = {
println( marshaling error )
e.printStackTrace
}
}
}
is resulting in this stack trace
scala res8.handle( stockholm )( res3.toXML( res5 ) )
res8.handle( stockholm )( res3.toXML( res5 ) )
res8.handle( stockholm )( res3.toXML( res5 ) )
log4j:WARN No appenders could be found for logger
(org.hibernate.cfg.annotations.Version).
log4j:WARN Please initialize the log4j system properly.
persistence error
javax.persistence.PersistenceException:
org.hibernate.exception.SQLGrammarException: Cannot open connection
at
org.hibernate.ejb.AbstractEntityManagerImpl.throwPersistenceException(AbstractEntityManagerImpl.java:637)
at org.hibernate.ejb.TransactionImpl.begin(TransactionImpl.java:41)
at
net.liftweb.amqp.JSONToSQLHandler$class.handle(JSONAMQPDispatcher.scala:80)
at
net.liftweb.amqp.JSONAMQPListener$JSONListener.handle(JSONAMQPDispatcher.scala:118)
...
Best wishes,
--greg
--
L.G. Meredith
Managing Partner
Biosimilarity LLC
1219 NW 83rd St
Seattle, WA 98117
+1 206.650.3740
http://biosimilarity.blogspot.com
--
L.G. Meredith
Managing Partner
Biosimilarity LLC
1219 NW 83rd St
Seattle, WA 98117
+1 206.650.3740
http://biosimilarity.blogspot.com
--~--~-~--~~~---~--~~
You received this message because you are subscribed to the Google Groups
Lift group.
To post to this group, send email to liftweb@googlegroups.com
To unsubscribe from this group, send email to
liftweb+unsubscr...@googlegroups.com
For more options, visit this group at
http://groups.google.com/group/liftweb?hl=en
-~--~~~~--~~--~--~---
[Lift] Re: project stockholm update
Chas, Man -- if i could get your help with a hibernate connection failure issue, i would be ever so grateful. Best wishes, --greg On Wed, May 27, 2009 at 12:07 PM, Charles F. Munat c...@munat.com wrote: Gh! I can't keep up. Does it ever slow down??? Chas. Timothy Perrett wrote: Sweet!!! On 27/05/2009 16:20, Meredith Gregory lgreg.mered...@gmail.com wrote: All, And i've added basic support for messaging with JSON over Rabbit. Best wishes, --greg On Wed, May 27, 2009 at 5:04 AM, Meredith Gregory lgreg.mered...@gmail.com wrote: All, The latest version in github now successfully generates SQL persistence layer from the BNF. * git clone git://github.com/leithaus/stockholm.git http://github.com/leithaus/stockholm.git * mvn clean compile process-classes process-classes Note bene: the process-classes goal currently needs to be called twice to generate the DDL scripts. Unfortunately, currently the persistence layer has to duplicate the abstract syntax class structure. The visitor to transform the abstract syntax classes to the persisted versions is not currently generated. It's easy to write, but it will be auto-generated in subsequent versions. Best wishes, --greg -- L.G. Meredith Managing Partner Biosimilarity LLC 1219 NW 83rd St Seattle, WA 98117 +1 206.650.3740 http://biosimilarity.blogspot.com --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups Lift group. To post to this group, send email to liftweb@googlegroups.com To unsubscribe from this group, send email to liftweb+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/liftweb?hl=en -~--~~~~--~~--~--~---
[Lift] Re: help with JPA annotation?
John,
Thanks for your response. i included in my first email query on this topic
the complete impl of ListVariableExpr, but that was a lengthy message and
it's small enough to be missed, so here it is again.
// container class generated to hold lists of variables
package com.biosimilarity.reflection.model.rlambda.Absyn; // Java Package
generated by the BNF Converter.
public class ListVariableExpr extends java.util.LinkedListVariableExpr {
}
i also checked that LinkedList implements Collection. Then i checked
hibernate documentation -- which said that if you don't have a generic you
have to provide a targetEntity annotation. i've done everything by the
book with no joy.
Best wishes,
--greg
On Mon, May 25, 2009 at 8:05 PM, John D. Heintz jhei...@gmail.com wrote:
Hello Greg,
What is the type of ListVariableExpr? Does Hibernate recognize that as
a java.util.collection?
My guess is that you need to change that type to a ListVariableExpr
for Hibernate to do the right thing.
That's probably not something you want to do, the alternative would be
to implement a UserType to customize the Hibernate mapping process. I
don't actually know how that would work with a collection type, but I
suspect some strange incantations would work.
Hope this helps,
John Heintz
On Mon, May 25, 2009 at 5:42 PM, Meredith Gregory
lgreg.mered...@gmail.com wrote:
All,
Below are the contents of three classfiles. The first and second
generated
by BNFC from the grammar here. The second is a subclass generated from
the
first to provide persistence to the abstract syntax. My procedure is
working
for everything but those classes that contain collections. The call to
hibernate via the maven-hibernate-plugin is generating the following
error.
[INFO]
[ERROR] FATAL ERROR
[INFO]
[INFO] org.hibernate.AnnotationException: Illegal attempt to map a non
collection as a @OneToMany, @ManyToMany or @CollectionOfElements:
com.biosimilarity.reflection.model.rlambda.Absyn.persistence.sql.AbstractionResource.listvariableexpr_
[INFO]
[INFO] Trace
javax.persistence.PersistenceException:
org.hibernate.AnnotationException:
Illegal attempt to map a non collection as a @OneToMany, @ManyToMany or
@CollectionOfElements:
com.biosimilarity.reflection.model.rlambda.Absyn.persistence.sql.AbstractionResource.listvariableexpr_
at
org.hibernate.ejb.Ejb3Configuration.configure(Ejb3Configuration.java:247)
at
org.codehaus.mojo.hibernate3.configuration.JPAComponentConfiguration.createConfiguration(JPAComponentConfiguration.java:26)
...
However, as the contents of the second class indicate, the member is
clearly
a collection. Is it that hibernate can't deal with subclasses of
collections?
Best wishes,
--greg
// class generated for abstractions
package com.biosimilarity.reflection.model.rlambda.Absyn; // Java Package
generated by the BNF Converter.
public class Abstraction extends Expression {
public final ListVariableExpr listvariableexpr_;
public final Expression expression_;
public Abstraction(ListVariableExpr p1, Expression p2) {
listvariableexpr_
= p1; expression_ = p2; }
public R,A R
accept(com.biosimilarity.reflection.model.rlambda.Absyn.Expression.VisitorR,A
v, A arg) { return v.visit(this, arg); }
public boolean equals(Object o) {
if (this == o) return true;
if (o instanceof
com.biosimilarity.reflection.model.rlambda.Absyn.Abstraction) {
com.biosimilarity.reflection.model.rlambda.Absyn.Abstraction x =
(com.biosimilarity.reflection.model.rlambda.Absyn.Abstraction)o;
return this.listvariableexpr_.equals(x.listvariableexpr_)
this.expression_.equals(x.expression_);
}
return false;
}
public int hashCode() {
return
37*(this.listvariableexpr_.hashCode())+this.expression_.hashCode();
}
}
// container class generated to hold lists of variables
package com.biosimilarity.reflection.model.rlambda.Absyn; // Java Package
generated by the BNF Converter.
public class ListVariableExpr extends java.util.LinkedListVariableExpr
{
}
// Generated by stockholm to add persistence to abstraction class
package com.biosimilarity.reflection.model.rlambda.Absyn.persistence.sql;
import javax.persistence.CascadeType;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.Id;
import javax.persistence.OneToMany;
import javax.persistence.Table;
import javax.persistence.UniqueConstraint;
import java.util.Date;
import java.util.HashSet;
import java.util.Set;
import java.util.Iterator;
import java.net.URI;
import
[Lift] Re: help with JPA annotation?
John,
Thanks for your suggestions. It appears that there are two problems that
come together, here.
- The custom subclass is actually a container for an abstract super class
of the possible concrete content classes. Only the concrete subclasses have
been given JPA annotations. In full generality, i've got to avail myself of
some single-table-inheritance (STI) strategy to push this through.
- i don't really have full control of the container class used -- unless
i write my own trampoline. The JPA annotated class is generated from a class
that is generated from a BNF Converter spec. They chose to implement lists
in this way.
It's easy to generate a trampoline -- which i can use to test the first
level of the problem. The STI is a bit more involved.
Best wishes,
--greg
On Tue, May 26, 2009 at 9:21 AM, John D. Heintz jhei...@gmail.com wrote:
I think I know, the custom subclass is breaking things.
From
http://docs.jboss.org/hibernate/stable/annotations/reference/en/html/entity.html#entity-mapping-association-collections
You can map Collection, List (ie ordered lists, not indexed lists),
Map and Set
These are the interfaces, not any concrete class. The reason is that
at runtime Hibernate will replace the property with a Hibernate
subclass of Collection or List that has the magic lazy-loading and
query caching details in it.
I think a viable strategy for you would be to:
* expose a ListVariableExpr instead of a LinkedList subclass
That loses two of the features you wanted: linkedList and specialized type
name.
I think the LinkedList just isn't persistable, and the second could be
re-obtained by providing a secondary method that wraps the primary
collection list with a new one for typing purposes.
Cheers,
John
ps - I prefer to annotate fields, not methods. It lets me alter the
persistence and public interfaces separately.
On Tue, May 26, 2009 at 7:59 AM, Meredith Gregory
lgreg.mered...@gmail.com wrote:
John,
Thanks for your response. i included in my first email query on this
topic
the complete impl of ListVariableExpr, but that was a lengthy message and
it's small enough to be missed, so here it is again.
// container class generated to hold lists of variables
package com.biosimilarity.reflection.
model.rlambda.Absyn; // Java Package generated by the BNF Converter.
public class ListVariableExpr extends java.util.LinkedListVariableExpr
{
}
i also checked that LinkedList implements Collection. Then i checked
hibernate documentation -- which said that if you don't have a generic
you
have to provide a targetEntity annotation. i've done everything by the
book with no joy.
Best wishes,
--greg
On Mon, May 25, 2009 at 8:05 PM, John D. Heintz jhei...@gmail.com
wrote:
Hello Greg,
What is the type of ListVariableExpr? Does Hibernate recognize that as
a java.util.collection?
My guess is that you need to change that type to a ListVariableExpr
for Hibernate to do the right thing.
That's probably not something you want to do, the alternative would be
to implement a UserType to customize the Hibernate mapping process. I
don't actually know how that would work with a collection type, but I
suspect some strange incantations would work.
Hope this helps,
John Heintz
On Mon, May 25, 2009 at 5:42 PM, Meredith Gregory
lgreg.mered...@gmail.com wrote:
All,
Below are the contents of three classfiles. The first and second
generated
by BNFC from the grammar here. The second is a subclass generated from
the
first to provide persistence to the abstract syntax. My procedure is
working
for everything but those classes that contain collections. The call to
hibernate via the maven-hibernate-plugin is generating the following
error.
[INFO]
[ERROR] FATAL ERROR
[INFO]
[INFO] org.hibernate.AnnotationException: Illegal attempt to map a non
collection as a @OneToMany, @ManyToMany or @CollectionOfElements:
com.biosimilarity.reflection.model.rlambda.Absyn.persistence.sql.AbstractionResource.listvariableexpr_
[INFO]
[INFO] Trace
javax.persistence.PersistenceException:
org.hibernate.AnnotationException:
Illegal attempt to map a non collection as a @OneToMany, @ManyToMany
or
@CollectionOfElements:
com.biosimilarity.reflection.model.rlambda.Absyn.persistence.sql.AbstractionResource.listvariableexpr_
at
org.hibernate.ejb.Ejb3Configuration.configure(Ejb3Configuration.java:247)
at
org.codehaus.mojo.hibernate3.configuration.JPAComponentConfiguration.createConfiguration(JPAComponentConfiguration.java:26)
...
However, as the contents of the second class indicate
[Lift] help with JPA annotation?
All,
Below are the contents of three classfiles. The first and second generated
by BNFC from the grammar
herehttp://github.com/leithaus/stockholm/blob/c64f6287a986c8f9f05220e5d3efd5dbfaad9c69/src/main/bnfc/rlambda.cf.
The second is a subclass generated from the first to provide persistence to
the abstract syntax. My procedure is working for everything but those
classes that contain collections. The call to hibernate via the
maven-hibernate-plugin is generating the following error.
[INFO]
[ERROR] FATAL ERROR
[INFO]
[INFO] org.hibernate.AnnotationException: Illegal attempt to map a non
collection as a @OneToMany, @ManyToMany or @CollectionOfElements:
com.biosimilarity.reflection.model.rlambda.Absyn.persistence.sql.AbstractionResource.listvariableexpr_
[INFO]
[INFO] Trace
javax.persistence.PersistenceException: org.hibernate.AnnotationException:
Illegal attempt to map a non collection as a @OneToMany, @ManyToMany or
@CollectionOfElements:
com.biosimilarity.reflection.model.rlambda.Absyn.persistence.sql.AbstractionResource.listvariableexpr_
at
org.hibernate.ejb.Ejb3Configuration.configure(Ejb3Configuration.java:247)
at
org.codehaus.mojo.hibernate3.configuration.JPAComponentConfiguration.createConfiguration(JPAComponentConfiguration.java:26)
...
However, as the contents of the second class indicate, the member is clearly
a collection. Is it that hibernate can't deal with subclasses of
collections?
Best wishes,
--greg
// class generated for abstractions
package com.biosimilarity.reflection.model.rlambda.Absyn; // Java Package
generated by the BNF Converter.
public class Abstraction extends Expression {
public final ListVariableExpr listvariableexpr_;
public final Expression expression_;
public Abstraction(ListVariableExpr p1, Expression p2) { listvariableexpr_
= p1; expression_ = p2; }
public R,A R
accept(com.biosimilarity.reflection.model.rlambda.Absyn.Expression.VisitorR,A
v, A arg) { return v.visit(this, arg); }
public boolean equals(Object o) {
if (this == o) return true;
if (o instanceof
com.biosimilarity.reflection.model.rlambda.Absyn.Abstraction) {
com.biosimilarity.reflection.model.rlambda.Absyn.Abstraction x =
(com.biosimilarity.reflection.model.rlambda.Absyn.Abstraction)o;
return this.listvariableexpr_.equals(x.listvariableexpr_)
this.expression_.equals(x.expression_);
}
return false;
}
public int hashCode() {
return
37*(this.listvariableexpr_.hashCode())+this.expression_.hashCode();
}
}
// container class generated to hold lists of variables
package com.biosimilarity.reflection.model.rlambda.Absyn; // Java Package
generated by the BNF Converter.
public class ListVariableExpr extends java.util.LinkedListVariableExpr {
}
// Generated by stockholm to add persistence to abstraction class
package com.biosimilarity.reflection.model.rlambda.Absyn.persistence.sql;
import javax.persistence.CascadeType;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.Id;
import javax.persistence.OneToMany;
import javax.persistence.Table;
import javax.persistence.UniqueConstraint;
import java.util.Date;
import java.util.HashSet;
import java.util.Set;
import java.util.Iterator;
import java.net.URI;
import com.biosimilarity.reflection.model.rlambda.Absyn.*;
import com.biosimilarity.reflection.model.rlambda.Absyn.persistence.sql.*;
@Entity
@Table(name = Abstraction_table, catalog = rlambda_production,
uniqueConstraints = { @UniqueConstraint(columnNames = uuid) })
public class AbstractionResource extends Abstraction {
private String uuid;
private String id;
public AbstractionResource(ListVariableExpr listvariableexpr_,
Expression expression_) {
super(listvariableexpr_, expression_);
}
@Id
@Column(name = uuid, unique = true, nullable = false, insertable =
true, updatable = true)
public String getUuid() {
return this.uuid;
}
public void setUuid(String id) {
this.uuid = id;
}
@Id
@Column(name = id, unique = true, nullable = false, insertable = true,
updatable = true)
public String getId() {
return this.uuid;
}
public void setId(String id) {
this.uuid = id;
}
@OneToMany(cascade = { CascadeType.ALL }, fetch = FetchType.LAZY,
mappedBy = AbstractionResource)
public ListVariableExpr getListvariableexpr_() {
return this.listvariableexpr_;
}
@Column(name = expression_, unique = false, nullable = true,
insertable = true, updatable = true)
public Expression getExpression_() {
return this.expression_;
}
}
--
L.G. Meredith
Managing Partner
Biosimilarity LLC
1219 NW 83rd St
Seattle, WA 98117
+1 206.650.3740
[Lift] Re: help with JPA annotation?
All,
Based on some web documentation i found for the OneToMany annotation, i
modified my compiler's output to generate
@OneToMany(cascade = { CascadeType.ALL }, fetch = FetchType.LAZY, mappedBy =
abstractionResource, targetEntity = VariableExpr.class)
public ListVariableExpr getListvariableexpr_() {
return this.listvariableexpr_;
}
instead of
@OneToMany(cascade = { CascadeType.ALL }, fetch = FetchType.LAZY, mappedBy =
AbstractionResource)
public ListVariableExpr getListvariableexpr_() {
return this.listvariableexpr_;
}
and i still get the same error
16:44:08,780 INFO org.hibernate.cfg.annotations.EntityBinder - Bind entity
com.biosimilarity.reflection.model.rlambda.Absyn.persistence.sql.AbstractionResource
on table Abstraction_table
[INFO]
[ERROR] FATAL ERROR
[INFO]
[INFO] org.hibernate.AnnotationException: Illegal attempt to map a non
collection as a @OneToMany, @ManyToMany or @CollectionOfElements:
com.biosimilarity.reflection.model.rlambda.Absyn.persistence.sql.AbstractionResource.listvariableexpr_
[INFO]
[INFO] Trace
javax.persistence.PersistenceException: org.hibernate.AnnotationException:
Illegal attempt to map a non collection as a @OneToMany, @ManyToMany or
@CollectionOfElements:
com.biosimilarity.reflection.model.rlambda.Absyn.persistence.sql.AbstractionResource.listvariableexpr_
at
org.hibernate.ejb.Ejb3Configuration.configure(Ejb3Configuration.java:247)
at
org.codehaus.mojo.hibernate3.configuration.JPAComponentConfiguration.createConfiguration(JPAComponentConfiguration.java:26)
...
Best wishes,
--greg
On Mon, May 25, 2009 at 3:42 PM, Meredith Gregory
lgreg.mered...@gmail.comwrote:
All,
Below are the contents of three classfiles. The first and second generated
by BNFC from the grammar
herehttp://github.com/leithaus/stockholm/blob/c64f6287a986c8f9f05220e5d3efd5dbfaad9c69/src/main/bnfc/rlambda.cf.
The second is a subclass generated from the first to provide persistence to
the abstract syntax. My procedure is working for everything but those
classes that contain collections. The call to hibernate via the
maven-hibernate-plugin is generating the following error.
[INFO]
[ERROR] FATAL ERROR
[INFO]
[INFO] org.hibernate.AnnotationException: Illegal attempt to map a non
collection as a @OneToMany, @ManyToMany or @CollectionOfElements:
com.biosimilarity.reflection.model.rlambda.Absyn.persistence.sql.AbstractionResource.listvariableexpr_
[INFO]
[INFO] Trace
javax.persistence.PersistenceException: org.hibernate.AnnotationException:
Illegal attempt to map a non collection as a @OneToMany, @ManyToMany or
@CollectionOfElements:
com.biosimilarity.reflection.model.rlambda.Absyn.persistence.sql.AbstractionResource.listvariableexpr_
at
org.hibernate.ejb.Ejb3Configuration.configure(Ejb3Configuration.java:247)
at
org.codehaus.mojo.hibernate3.configuration.JPAComponentConfiguration.createConfiguration(JPAComponentConfiguration.java:26)
...
However, as the contents of the second class indicate, the member is
clearly a collection. Is it that hibernate can't deal with subclasses of
collections?
Best wishes,
--greg
// class generated for abstractions
package com.biosimilarity.reflection.model.rlambda.Absyn; // Java Package
generated by the BNF Converter.
public class Abstraction extends Expression {
public final ListVariableExpr listvariableexpr_;
public final Expression expression_;
public Abstraction(ListVariableExpr p1, Expression p2) {
listvariableexpr_ = p1; expression_ = p2; }
public R,A R
accept(com.biosimilarity.reflection.model.rlambda.Absyn.Expression.VisitorR,A
v, A arg) { return v.visit(this, arg); }
public boolean equals(Object o) {
if (this == o) return true;
if (o instanceof
com.biosimilarity.reflection.model.rlambda.Absyn.Abstraction) {
com.biosimilarity.reflection.model.rlambda.Absyn.Abstraction x =
(com.biosimilarity.reflection.model.rlambda.Absyn.Abstraction)o;
return this.listvariableexpr_.equals(x.listvariableexpr_)
this.expression_.equals(x.expression_);
}
return false;
}
public int hashCode() {
return
37*(this.listvariableexpr_.hashCode())+this.expression_.hashCode();
}
}
// container class generated to hold lists of variables
package com.biosimilarity.reflection.model.rlambda.Absyn; // Java Package
generated by the BNF Converter.
public class ListVariableExpr extends java.util.LinkedListVariableExpr {
}
// Generated by stockholm to add persistence to abstraction class
package
[Lift] Re: [scala] project stockholm
Christos, It would be easy to target Scala. However, since it targets Java, i've not yet seen the need. Best wishes, --greg On Fri, May 22, 2009 at 1:59 AM, Christos KK Loverdos lover...@gmail.comwrote: Hi Greg, I didn't know of BNFC until you mentioned it in the Scala lists some time ago and I admit I find it very interesting. Since it is apparent you know the software, I was wondering how easy would it be to add support for Scala as an output language. Christos. On Fri, May 22, 2009 at 05:13, Meredith Gregory lgreg.mered...@gmail.comwrote: All, i've been working in earnest on a little open source project for DSL generation that my wife suggested i call stockholm (whom am i to argue). At this point it's just about syntax, not execution. From a BNF file you generate - a web-hosted parser/repl - the abstract syntax class of the parser support visitor pattern traversal - a set of subclasses that map the abstract syntax to store - right now i've got SQL via a JPA layer - shortly i will also have an XML persistence layer via DBXML Slightly burdensome dependencies - i use BNFC which means you need Haskell + Happy + Alex installed on your system. (On a mac this is port install Haskell, port install Happy, port install Alex.) - When the XML persistence comes on line there will be a dependency on DBXML. - Neither of these dependencies play nicely with maven. i've got some strategies for workin around this for the parser generator, but not for the XML persistence layer. In a not too distant release i will add some support for specifying and generating operational semantics via techniques borrowed from Peter Sewell's Ott. Best wishes, --greg -- L.G. Meredith Managing Partner Biosimilarity LLC 1219 NW 83rd St Seattle, WA 98117 +1 206.650.3740 http://biosimilarity.blogspot.com -- __~O -\ , Christos KK Loverdos (*)/ (*) http://ckkloverdos.com -- L.G. Meredith Managing Partner Biosimilarity LLC 1219 NW 83rd St Seattle, WA 98117 +1 206.650.3740 http://biosimilarity.blogspot.com --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups Lift group. To post to this group, send email to liftweb@googlegroups.com To unsubscribe from this group, send email to liftweb+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/liftweb?hl=en -~--~~~~--~~--~--~---
