[Lift] Re: chaining servlets
On Mon, Mar 2, 2009 at 8:51 PM, Meredith Gregory lgreg.mered...@gmail.comwrote: Lifted, scalads and lasses, Does anybody have a working sample of chaining the lift servlet with a 3rd party servlet? i'm interested in doing this with the Jersey servlet to get some of their request/response rendering support. This is why we made Lift a Filter :) Best wishes, --greg -- L.G. Meredith Managing Partner Biosimilarity LLC 806 55th St NE Seattle, WA 98105 +1 206.650.3740 http://biosimilarity.blogspot.com -- Viktor Klang Senior Systems Analyst --~--~-~--~~~---~--~~ 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: chaining servlets
PPS The reason i want Jersey on the outbound path is that it has pretty nifty support for rendering to XML and other formats. A single Produces annotation at the class level, for example, suffices to cause all the web methods to render according to format specified in the annotation. Oh, and Jersey also autogenerates the WADL description of the service -- which is going to come in handy for other stuff we're doing. On Mon, Mar 2, 2009 at 3:16 PM, Meredith Gregory lgreg.mered...@gmail.comwrote: Tim, et al, Thanks for the many responses. Here's the overall context. i've got a group that has done some significant work building a JRoR site. Now they want to scale. As a part of a midterm strategy to get some reasonable tooling in, we're building Scala-based RESTful APIs. Being an idiot, i want as general a soln as possible. So, here's what i've done. - a plain, vanilla Hibernate reverse engineering strategy will fetch both JPA and simple POJOs - This gets me Scala access to the backend - Now, i want to generate default controller behavior. i've written a Scala program that eats what Hibernate spits out and creates default controller behavior. It uses the Jersey annotations (Produces, Consumes, Path, GET, PUT,...) to control rendering to/from the client of the RESTful API What i want to do now is to interject lift into the mix so that we can allow programmers to specialize the controller behavior in scala/lift code. The reason i've attempted to be fairly generic about all this is that i believe this represents a tool-chain that allows a semi-automated migration path from pick-you-webframework to lift/scala. The idea is that the SQL schema is about 80% of where the rubber meets the road, so that ought to be the place to hoist your app out of some existing solution. This works especially well if you're transition from a JVM soln (JRoR) to a JVM soln. Best wishes, --greg On Mon, Mar 2, 2009 at 3:02 PM, Timothy Perrett timo...@getintheloop.euwrote: Greg, can I enquire to your specific use case? I’d be interested to hear what you feel Jersey adds value to over lift (im not familiar with Jersey)? In my experience when you need a round the houses solution such as this their can often be a simpler path :-) Cheers, Tim On 02/03/2009 22:46, Viktor Klang viktor.kl...@gmail.com wrote: hehe, no worries, I'm one of your fans. :) You should be able to accomplish this by having the filter mapping for Jersey in web.xml placed before the Lift filter mapping: Recall that a filter chain is one of the objects passed to the doFiltermethod of a filter. This chain is formed indirectly via filter mappings. The order of the filters in the chain is the same as the order that filter mappings appear in the web application deployment descriptor. http://java.sun.com/products/servlet/Filters.html The Jersey will handle the request first, then pass it thru to Lift, then back. I of course have not tested this with Jersey and do not know if there are any strange things that can happen. But I'm sure you'll find out and get back to us ;) Cheers, Viktor On Mon, Mar 2, 2009 at 11:28 PM, Meredith Gregory lgreg.mered...@gmail.com wrote: Marius, Viktor, Many thanks for your prompt responses. You'll have to pardon me as i've not graduated from Web101 ;-). i was really looking for an example. To illustrate, in looking at web.xml in a archetype-generated lift project i see that only filter and filter mapping is defined. How is a servlet then chosen? Also, i'm sort of interested in *wrapping* lift's request processing. Here's what i mean. If i've understood what Jersey does correctly (and that's a big if), then it will do Request and Response rendering. So, what i want is == HttpRequest == (JerseyFilter) == ModifiedRequest == (LiftFilter) == Response == (JerseyFilter) == ModifiedOutboundResponse == It's not clear to me how this is accomplished. There's the dead obvious idea, but i'm leary that this won't work because the types are unlikely to line up. Best wishes, --greg On Mon, Mar 2, 2009 at 1:00 PM, Viktor Klang viktor.kl...@gmail.com wrote: On Mon, Mar 2, 2009 at 8:51 PM, Meredith Gregory lgreg.mered...@gmail.com wrote: Lifted, scalads and lasses, Does anybody have a working sample of chaining the lift servlet with a 3rd party servlet? i'm interested in doing this with the Jersey servlet to get some of their request/response rendering support. This is why we made Lift a Filter :) Best wishes, --greg -- L.G. Meredith Managing Partner Biosimilarity LLC 806 55th St NE Seattle, WA 98105 +1 206.650.3740 http://biosimilarity.blogspot.com -- L.G. Meredith Managing Partner Biosimilarity LLC 806 55th St NE Seattle, WA 98105 +1 206.650.3740 http://biosimilarity.blogspot.com --~--~-~--~~~---~--~~ You received this message because you are
[Lift] Re: chaining servlets
David, Please find below the web.xml i'm currently experimenting with. Best wishes, --greg ?xml version=1.0 encoding=ISO-8859-1? !DOCTYPE web-app PUBLIC -//Sun Microsystems, Inc.//DTD Web Application 2.3//EN http://java.sun.com/dtd/web-app_2_3.dtd; web-app filter filter-nameJerseyFilter/filter-name display-nameJersey Filter/display-name descriptionAttempting to use Jersey as a Filter/description filter-classcom.sun.jersey.spi.container.servlet.ServletContainer/filter-class /filter filter filter-nameLiftFilter/filter-name display-nameLift Filter/display-name descriptionThe Filter that intercepts lift calls/description filter-classnet.liftweb.http.LiftFilter/filter-class /filter filter-mapping filter-nameJerseyFilter/filter-name url-pattern/*/url-pattern /filter-mapping filter-mapping filter-nameLiftFilter/filter-name url-pattern/*/url-pattern /filter-mapping /web-app On Mon, Mar 2, 2009 at 3:00 PM, David Pollak feeder.of.the.be...@gmail.comwrote: Not to be a nudge, but how about if Greg sends us his web.xml file and the name of his Jersey Filter, we re-write the web.xml file for him and he writes a wiki page explaining the process? On Mon, Mar 2, 2009 at 2:46 PM, Viktor Klang viktor.kl...@gmail.comwrote: hehe, no worries, I'm one of your fans. :) You should be able to accomplish this by having the filter mapping for Jersey in web.xml placed before the Lift filter mapping: Recall that a filter chain is one of the objects passed to the doFiltermethod of a filter. This chain is formed indirectly via filter mappings. The order of the filters in the chain is the same as the order that filter mappings appear in the web application deployment descriptor. http://java.sun.com/products/servlet/Filters.html The Jersey will handle the request first, then pass it thru to Lift, then back. I of course have not tested this with Jersey and do not know if there are any strange things that can happen. But I'm sure you'll find out and get back to us ;) Cheers, Viktor On Mon, Mar 2, 2009 at 11:28 PM, Meredith Gregory lgreg.mered...@gmail.com wrote: Marius, Viktor, Many thanks for your prompt responses. You'll have to pardon me as i've not graduated from Web101 ;-). i was really looking for an example. To illustrate, in looking at web.xml in a archetype-generated lift project i see that only filter and filter mapping is defined. How is a servlet then chosen? Also, i'm sort of interested in *wrapping* lift's request processing. Here's what i mean. If i've understood what Jersey does correctly (and that's a big if), then it will do Request and Response rendering. So, what i want is == HttpRequest == (JerseyFilter) == ModifiedRequest == (LiftFilter) == Response == (JerseyFilter) == ModifiedOutboundResponse == It's not clear to me how this is accomplished. There's the dead obvious idea, but i'm leary that this won't work because the types are unlikely to line up. Best wishes, --greg On Mon, Mar 2, 2009 at 1:00 PM, Viktor Klang viktor.kl...@gmail.comwrote: On Mon, Mar 2, 2009 at 8:51 PM, Meredith Gregory lgreg.mered...@gmail.com wrote: Lifted, scalads and lasses, Does anybody have a working sample of chaining the lift servlet with a 3rd party servlet? i'm interested in doing this with the Jersey servlet to get some of their request/response rendering support. This is why we made Lift a Filter :) Best wishes, --greg -- L.G. Meredith Managing Partner Biosimilarity LLC 806 55th St NE Seattle, WA 98105 +1 206.650.3740 http://biosimilarity.blogspot.com -- Viktor Klang Senior Systems Analyst -- L.G. Meredith Managing Partner Biosimilarity LLC 806 55th St NE Seattle, WA 98105 +1 206.650.3740 http://biosimilarity.blogspot.com -- Viktor Klang Senior Systems Analyst -- 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 806 55th St NE Seattle, WA 98105 +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: chaining servlets
Greg, I'm very interested in how this works out. I've been looking at Jersey and I really like the annotations, but I have been way too swamped to really play with it with Lift (I've only tried their Hello World app). If you get this working, I'd love to see it. Chas. Meredith Gregory wrote: Tim, et al, Thanks for the many responses. Here's the overall context. i've got a group that has done some significant work building a JRoR site. Now they want to scale. As a part of a midterm strategy to get some reasonable tooling in, we're building Scala-based RESTful APIs. Being an idiot, i want as general a soln as possible. So, here's what i've done. * a plain, vanilla Hibernate reverse engineering strategy will fetch both JPA and simple POJOs o This gets me Scala access to the backend * Now, i want to generate default controller behavior. i've written a Scala program that eats what Hibernate spits out and creates default controller behavior. It uses the Jersey annotations (Produces, Consumes, Path, GET, PUT,...) to control rendering to/from the client of the RESTful API What i want to do now is to interject lift into the mix so that we can allow programmers to specialize the controller behavior in scala/lift code. The reason i've attempted to be fairly generic about all this is that i believe this represents a tool-chain that allows a semi-automated migration path from pick-you-webframework to lift/scala. The idea is that the SQL schema is about 80% of where the rubber meets the road, so that ought to be the place to hoist your app out of some existing solution. This works especially well if you're transition from a JVM soln (JRoR) to a JVM soln. Best wishes, --greg On Mon, Mar 2, 2009 at 3:02 PM, Timothy Perrett timo...@getintheloop.eu wrote: Greg, can I enquire to your specific use case? I’d be interested to hear what you feel Jersey adds value to over lift (im not familiar with Jersey)? In my experience when you need a round the houses solution such as this their can often be a simpler path :-) Cheers, Tim On 02/03/2009 22:46, Viktor Klang viktor.kl...@gmail.com http://viktor.kl...@gmail.com wrote: hehe, no worries, I'm one of your fans. :) You should be able to accomplish this by having the filter mapping for Jersey in web.xml placed before the Lift filter mapping: Recall that a filter chain is one of the objects passed to the doFilter method of a filter. This chain is formed indirectly via filter mappings. The order of the filters in the chain is the same as the order that filter mappings appear in the web application deployment descriptor. http://java.sun.com/products/servlet/Filters.html The Jersey will handle the request first, then pass it thru to Lift, then back. I of course have not tested this with Jersey and do not know if there are any strange things that can happen. But I'm sure you'll find out and get back to us ;) Cheers, Viktor On Mon, Mar 2, 2009 at 11:28 PM, Meredith Gregory lgreg.mered...@gmail.com http://lgreg.mered...@gmail.com wrote: Marius, Viktor, Many thanks for your prompt responses. You'll have to pardon me as i've not graduated from Web101 ;-). i was really looking for an example. To illustrate, in looking at web.xml in a archetype-generated lift project i see that only filter and filter mapping is defined. How is a servlet then chosen? Also, i'm sort of interested in */wrapping/* lift's request processing. Here's what i mean. If i've understood what Jersey does correctly (and that's a big if), then it will do Request and Response rendering. So, what i want is == HttpRequest == (JerseyFilter) == ModifiedRequest == (LiftFilter) == Response == (JerseyFilter) == ModifiedOutboundResponse == It's not clear to me how this is accomplished. There's the dead obvious idea, but i'm leary that this won't work because the types are unlikely to line up. Best wishes, --greg On Mon, Mar 2, 2009 at 1:00 PM, Viktor Klang viktor.kl...@gmail.com http://viktor.kl...@gmail.com wrote: On Mon, Mar 2, 2009 at 8:51 PM, Meredith Gregory lgreg.mered...@gmail.com http://lgreg.mered...@gmail.com wrote: Lifted, scalads and lasses, Does anybody have a working sample of chaining the lift servlet with a 3rd party servlet? i'm interested in doing this with the Jersey
