Hi David,
I just tried something similar out.
1. I created a blank 1.0 lift project
2. I updated the pom file to reference lift-1.1M6
3. I added a line to the hello world snippet in its body:
println("Constructor")
4. I modified index.html to call the snippet twice.
5. I then launched the web server (mvn jetty:run) and accessed the
main page once via a browser
The line println("Constructor") gets called twice, I expected it just
to get called once.
Am I doing something wrong? Your test is not exactly the same as the
problem I described, I described the constructor getting called 18
times, I haven't yet verified whether or not the data is shared.
and here is the output:
[INFO] Started Jetty Server
[INFO] Starting scanner at interval of 5 seconds.
Constructor
Constructor
INFO - Service request (GET) / took 393 Milliseconds
INFO - Service request (GET) /classpath/jquery.js took 39 Milliseconds
INFO - Service request (GET) /ajax_request/
liftAjax.js;jsessionid=11x3vru6uimmg took 11 Milliseconds
INFO - Service request (GET) /favicon.ico took 6 Milliseconds
INFO - Service request (POST) /ajax_request/F318697140471TRN/ took 11
Milliseconds
INFO - Service request (POST) /ajax_request/F318697140471TRN/ took 1
Milliseconds
Snippet code:
package com.liftcode.hello.snippet
class HelloWorld {
println("Constructor")
def howdy = <span>Welcome to hello-lift at {new
_root_.java.util.Date}</span>
}
index.html:
<lift:surround with="default" at="content">
<h2>Welcome to your project!</h2>
<p><lift:helloWorld.howdy /></p>
<p><lift:helloWorld.howdy /></p>
</lift:surround>
Here is the pom.xml:
<project xmlns="http://maven.apache.org/POM/4.0.0"; xmlns:xsi="http://
www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://
maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd";>
<modelVersion>4.0.0</modelVersion>
<groupId>com.liftcode.hello</groupId>
<artifactId>hello-lift</artifactId>
<version>1.0-SNAPSHOT</version>
<packaging>war</packaging>
<name>hello-lift</name>
<inceptionYear>2007</inceptionYear>
<properties>
<scala.version>2.7.3</scala.version>
</properties>
<repositories>
<repository>
<id>scala-tools.org</id>
<name>Scala-Tools Maven2 Repository</name>
<url>http://scala-tools.org/repo-releases</url>
</repository>
</repositories>
<pluginRepositories>
<pluginRepository>
<id>scala-tools.org</id>
<name>Scala-Tools Maven2 Repository</name>
<url>http://scala-tools.org/repo-releases</url>
</pluginRepository>
</pluginRepositories>
<dependencies>
<dependency>
<groupId>org.scala-lang</groupId>
<artifactId>scala-library</artifactId>
<version>${scala.version}</version>
</dependency>
<dependency>
<groupId>net.liftweb</groupId>
<artifactId>lift-util</artifactId>
<version>1.1-M6</version>
</dependency>
<dependency>
<groupId>net.liftweb</groupId>
<artifactId>lift-webkit</artifactId>
<version>1.1-M6</version>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>servlet-api</artifactId>
<version>2.5</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.5</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.mortbay.jetty</groupId>
<artifactId>jetty</artifactId>
<version>[6.1.6,)</version>
<scope>test</scope>
</dependency>
<!-- for LiftConsole -->
<dependency>
<groupId>org.scala-lang</groupId>
<artifactId>scala-compiler</artifactId>
<version>${scala.version}</version>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<sourceDirectory>src/main/scala</sourceDirectory>
<testSourceDirectory>src/test/scala</testSourceDirectory>
<plugins>
<plugin>
<groupId>org.scala-tools</groupId>
<artifactId>maven-scala-plugin</artifactId>
<executions>
<execution>
<goals>
<goal>compile</goal>
<goal>testCompile</goal>
</goals>
</execution>
</executions>
<configuration>
<scalaVersion>${scala.version}</scalaVersion>
</configuration>
</plugin>
<plugin>
<groupId>org.mortbay.jetty</groupId>
<artifactId>maven-jetty-plugin</artifactId>
<configuration>
<contextPath>/</contextPath>
<scanIntervalSeconds>5</scanIntervalSeconds>
</configuration>
</plugin>
<plugin>
<groupId>net.sf.alchim</groupId>
<artifactId>yuicompressor-maven-plugin</artifactId>
<executions>
<execution>
<goals>
<goal>compress</goal>
</goals>
</execution>
</executions>
<configuration>
<nosuffix>true</nosuffix>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-eclipse-plugin</artifactId>
<configuration>
<downloadSources>true</downloadSources>
<excludes>
<exclude>org.scala-lang:scala-library</exclude>
</excludes>
<classpathContainers>
<classpathContainer>ch.epfl.lamp.sdt.launching.SCALA_CONTAINER</
classpathContainer>
</classpathContainers>
<projectnatures>
<java.lang.String>ch.epfl.lamp.sdt.core.scalanature</
java.lang.String>
<java.lang.String>org.eclipse.jdt.core.javanature</
java.lang.String>
</projectnatures>
<buildcommands>
<java.lang.String>ch.epfl.lamp.sdt.core.scalabuilder</
java.lang.String>
</buildcommands>
</configuration>
</plugin>
</plugins>
</build>
<reporting>
<plugins>
<plugin>
<groupId>org.scala-tools</groupId>
<artifactId>maven-scala-plugin</artifactId>
<configuration>
<scalaVersion>${scala.version}</scalaVersion>
</configuration>
</plugin>
</plugins>
</reporting>
</project>
On Dec 7, 3:28 pm, David Pollak <feeder.of.the.be...@gmail.com> wrote:
> On Sun, Dec 6, 2009 at 5:44 AM, Alex Black <a...@alexblack.ca> wrote:
> > > We made this change for Lift 1.1. So, if you're using 1.1, the same
> > > instance of a snippet should be used for a given HTTP request.
>
> > Hi David, I've just switch from Lift 1.0 to Lift 1.1-M6, do you think
> > this change is in M6?
>
> Yes.
>
> Snippet:
>
> class HelloWorld {
> lazy val date: Box[Date] = DependencyFactory.inject[Date] // inject the
> date
>
> val random = randomString(20)
>
> def howdy(in: NodeSeq): NodeSeq =
> Helpers.bind("b", in, "time" -> date.map(d => Text(d.toString)))
>
> def dog: NodeSeq = <b>String is {random}</b>
>
> def cat: NodeSeq = <b>From cat String is {random}</b>
>
> }
>
> View:
>
> <lift:surround with="default" at="content">
> <h2>Welcome to your project!</h2>
> <lift:helloWorld.howdy>
> <span>Welcome to iscached at <b:time/></span>
> </lift:helloWorld.howdy>
> </p>
>
> <p> Dog sez <lift:HelloWorld.dog/></p>
>
> <p> Cat sez <lift:HelloWorld.cat/></p>
>
> </lift:surround>
>
> Browser:
>
> Welcome to your project!
>
> Welcome to iscached at Mon Dec 07 12:26:41 PST 2009
>
> Dog sez String is 4G2NRM4TBGCJBYNGFCUF
>
> Cat sez From cat String is 4G2NRM4TBGCJBYNGFCUF
>
> Works as advertised and has been in the code since at least M6.
>
> Thanks,
>
> David
>
>
>
> > It doesn't seem to be... I have many calls to my
> > snippet for a particular page, and I put a println statement in the
> > body of the snippet, and it gets called 18 times each request!
>
> > - Alex
>
> > > > I'd imagine lift could even generate a requestVar representing each
> > > > snippet for the developers, allowing snippets in a given HTTP request
> > > > to access each other easily.
>
> > > I don't think this is technically possible within the bounds of the type
> > > system.
>
> > > > On Nov 20, 11:09 am, Ross Mellgren <dri...@gmail.com> wrote:
> > > > > RequestVar is the standard way of doing this. For example
>
> > > > > object MySharedInformation {
> > > > > object myData extends RequestVar[List[Thing]](loadThings)
> > > > > // ^^^^^^^^^^^ ^^^^^^^^^^
> > > > > // Type of thing to store How to initialize
> > > > > variable first time it's accessed
>
> > > > > private def loadThings: List[Thing] = ...
>
> > > > > }
>
> > > > > class Snippet1 {
> > > > > import MySharedInformation.myData
> > > > > def render(ns: NodeSeq): NodeSeq = {
> > > > > myData.is.map(thing => { ... })
> > > > > }
>
> > > > > }
>
> > > > > class Snippet2 {
> > > > > import MySharedInformation.myData
> > > > > ...
>
> > > > > }
>
> > > > > The lifetime of the value is during the current request processing
> > and
> > > > > any AJAX calls related to it.
>
> > > > > If you really want to initialize it in a snippet, then use a Box with
> > > > > a RequestVar, like this:
>
> > > > > object MySharedInformation {
> > > > > object myData extends RequestVar[Box[List[Thing]]](Empty)
>
> > > > > }
>
> > > > > class LoaderSnippet {
> > > > > import MySharedInformation.myData
> > > > > def render(ns: NodeSeq): NodeSeq = {
> > > > > myData.set(Full(...))
> > > > > }
>
> > > > > }
>
> > > > > class ReaderSnippet {
> > > > > import MySharedInformation.myData
> > > > > def render(ns: NodeSeq): NodeSeq = {
> > > > > // If the data has not been loaded, default to an empty list
> > > > > val data = myData.is.openOr(Nil)
> > > > > ...
> > > > > }
>
> > > > > }
>
> > > > > class OtherReaderSnippet {
> > > > > import MySharedInformation.myData
> > > > > def render(ns: NodeSeq): NodeSeq = {
> > > > > // Do two entirely different things if the data has versus
> > > > > has not been loaded
> > > > > myData.is match {
> > > > > case Full(data) => // do something when the data has
> > been
> > > > > loaded
> > > > > case _ => // do something when the data has not been
> > loaded
> > > > > }
> > > > > }
>
> > > > > }
>
> > > > > HTH,
> > > > > -Ross
>
> > > > > On Nov 20, 2009, at 10:59 AM, Alex Black wrote:
>
> > > > > > I've got a template page, say foobar.html, that makes a number of
> > > > > > calls to functions in a snippet, e.g. mysnippet.foo1,
> > mysnippet.foo2,
> > > > > > mysnippet.foo3.
>
> > > > > > I'd like to do some initial work in foo1, e.g. retrieve some data
> > and
> > > > > > do some work on it, then in foo2 and foo3 display parts of that
> > data.
>
> > > > > > Whats the easiest way to do this? I think I misunderstood the lift
> > > > > > book:
>
> > > > > > "That means that for each request, Lift creates a new instance of
> > the
> > > > > > snippet class to execute. Any changes you make to instance
> > variables
> > > > > > will be discarded after the request is processed."
>
> > > > > > I thought this meant that for a given HTTP request, there would be
> > one
> > > > > > (and only one) instance of my snippet, so I could call several of
> > its
> > > > > > methods and they could all access the snippet's member variables,
> > > > > > which would then be discarded at the end of the request.
>
> > > > > > Am I going about this wrong? should I only have one snippet
> > function
> > > > > > per template?
>
> > > > > > Thx
>
> > > > > > - Alex
>
> > > > > > --
>
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> > > --
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