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Posted to dev@tuscany.apache.org by Bert Lamb <al...@pobox.com> on 2006/08/24 14:48:47 UTC
Problems with porting jsonrpc binding
Ant,
Changed the subject which I forgot to do on the last email...
So just to clarify, until the extension mechanism is finalized I need
be modifying scdl files in the webapp-host.jar to get my binding
picked up?
-Bert
On 8/24/06, ant elder <an...@gmail.com> wrote:
> It looks pretty good. I'm guessing the system scdl being used by the web app
> doesn't include the scdl for your binding. The way the sample webapps are
> done right now with all the jars going into the webapp lib you need to add
> all extensions to the system scdl being used. In you web.xml there's a
> parameter systemScdlPath which is set to /META-INF/sca/webapp.system.scdl.
> That will pick up the resource from the webapp-host.jar. Update that file or
> copy it somewhere else and update the systemScdlPath to point at the new
> file, and add in your jsonrpc scdl elements.
>
> Once we get extension plugabilty going properly in the samples this wont be
> necessary.
>
> ...ant
>
> On 8/24/06, Bert Lamb <al...@pobox.com> wrote:
> >
> > Ok, my I tried to send this email earlier, but it bounced as spam, so
> > I'm going to try again with a link to my attachment and see if that
> > helps....
> >
> > So I'm sure it is something stupid, but I'm missing something.
> > I've got the sample webapp packaged correctly (I think) and it was
> > giving the error about the unrecognized element binding.jasonrpc. I
> > then added my jsonrpc-1.0-SNAPSHOT.jar that I thought was at least
> > mocked up correctly to get me onto the next error, but it doesn't seem
> > to be getting picked up, and I still have the unrecognized element
> > binding.jsonrpc error.
> >
> > Here is a link to a zip of my binding.jsonrpc source tree. Any ideas?
> >
> > http://bertlamb.com/binding.jsonrpc.zip
> >
> > Thanks!
> >
> > -Bert
> >
> > On 8/18/06, ant elder <an...@gmail.com> wrote:
> > > Hi Bert,
> > >
> > > I agree there's going to be some challenges to solve to integrate REST
> > well
> > > with Tuscany, I'll stay out of that for now and focus on how to get you
> > > started with bindings. Implementing a simple binding would be a good
> > place
> > > to start so if you want to port over the old jsonrpc binding that would
> > be
> > > great.
> > >
> > > The code for that is at,
> > >
> > http://svn.apache.org/repos/asf/incubator/tuscany/branches/java-post-M1/sca/bindings/binding.jsonrpc/
> > ,
> > > and there's a sample,
> > >
> > http://svn.apache.org/repos/asf/incubator/tuscany/branches/java-post-M1/samples/sca/helloworldjsonrpc/
> > .
> > > You could download the Tuscany M1 distribution if you want to see the
> > sample
> > > running.
> > >
> > > I'd start by taking the sample and getting it to fit in with the new
> > code
> > > base - convert the SCDL to the new format, and get the war packaging
> > > correct. You could use the Axis2 WS sample as a model for that which is
> > at,
> > >
> > http://svn.apache.org/repos/asf/incubator/tuscany/java/samples/sca/helloworldws/
> > .
> > > (The WAR packaging is going to change once I finish the
> > > TuscanyServletListener and ServletHost work, I'll let you know when that
> > > goes in)
> > >
> > > Once you get the WAR right when you deploy it to tomcat you should see
> > an
> > > exception about an unrecognized element: binding.jsonrpc, thats because
> > > Tuscany doesn't have a binding for it so now you need to convert the
> > > binding over to the new Tuscany runtime. There's several bindings to use
> > as
> > > models, the RMI or echo ones are simple, the Axis2 uses the ServletHost
> > > which you'll also need to do:
> > >
> > >
> > http://svn.apache.org/repos/asf/incubator/tuscany/java/sca/bindings/binding.rmi/
> > >
> > http://svn.apache.org/repos/asf/incubator/tuscany/java/samples/sca/echo.binding/
> > >
> > http://svn.apache.org/repos/asf/incubator/tuscany/java/sca/bindings/binding.axis2/
> > >
> > > Copy the existing echo or RMI binding, rename all 'rmi' to jsonrpc',
> > then
> > > try to hook up the JSONRPCEntryPointServlet based on what the Axis2
> > binding
> > > is doing. You wont need the RMIReference or RMIInvoker classes as
> > jsonrpc
> > > only supports services.
> > >
> > > There's also a binding using DWR instead of json-rpc-java which you port
> > to
> > > the new runtime and its a bit more interesting as it also supports
> > > references (well, externalServices) so you could look at that as well if
> > > you're interested:
> > > http://svn.apache.org/repos/asf/incubator/tuscany/sandbox/ant/ajax/.
> > >
> > > If you search back in the dev list archives there's a few mails where we
> > > talk about what these two binding do.
> > >
> > > Hope this helps,
> > >
> > > ...ant
> > >
> > > On 8/17/06, Bert Lamb <al...@pobox.com> wrote:
> > > >
> > > > On 8/16/06, Jeremy Boynes <jb...@apache.org> wrote:
> > > > >
> > > > > In terms of the basic transport, in M1 we had a JSON-RPC binding
> > that
> > > > > supported JSON encoded data over HTTP. We have not got around yet to
> > > > > porting that to the new structure in the trunk. Looking at that
> > would
> > > > > be a good way to dig into how Tuscany works.
> > > > >
> > > >
> > > > I can make an attempt to try and port the jsonrpc binding from M1 over
> > > > to trunk style extensions if this would be appreciated. I agree that
> > > > should help me get an understanding of how some of Tuscany works.
> > > >
> > > > > Oisin may have been referring to how REST would impact the
> > > > > programming model rather than the implementation of bindings. For
> > > > > example, how would cache information in the request be handled by
> > the
> > > > > binding and/or exposed to the application code? What is the mapping
> > > > > between REST resources and SCA services?
> > > > >
> > > >
> > > > Yes, the more I read, the more I wonder if trying to support REST
> > > > style web applications in SCA is going to become a square peg in a
> > > > round hole problem. I've only begun really looking at this though,
> > > > and welcome any thoughts on the subject of how one might attempt to
> > > > interface REST resources in SCA.
> > > >
> > > > -Bert
> > > >
> > > > ---------------------------------------------------------------------
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> > > > For additional commands, e-mail: tuscany-dev-help@ws.apache.org
> > > >
> > > >
> > >
> > >
> >
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> >
> >
>
>
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Re: Problems with porting jsonrpc binding
Posted by ant elder <an...@gmail.com>.
I don't think you are missing anything, this looks like a bug. Could you
raise a JIRA for it?...and a patch to fix it if you're keen :)
...ant
On 8/25/06, Bert Lamb <al...@pobox.com> wrote:
>
> Ok, so the good news is that I got the binding and the sample working
> when modifying the webapp.system.scdl in webapp-host.jar.
>
> I decided it would be cleaner though to create my own copy of
> webapp.system.scdl (and call it jsonrpc.system.scdl) to put in my
> hello world webapp. I tried this and modified the web.xml to have
>
> <context-param>
> <param-name>systemScdlPath</param-name>
> <param-value>/META-INF/sca/jsonrpc.system.scdl</param-value>
> </context-param>
>
> However, this gives me a "Null system SCDL URL" Exception thrown. I
> looked at ServletLauncherListener.java and it looks like the
> systemScdlPath URL is being loaded with a different classloader than
> the applicationScdlPath which may be leading to the exception.
>
> Guess I'll just stick with hacking into webapp-host.jar for now,
> unless there is something I'm missing?
>
> -Bert
>
>
> On 8/24/06, ant elder <an...@gmail.com> wrote:
> > On 8/24/06, Bert Lamb <al...@pobox.com> wrote:
> >
> > <snip/>
> >
> > So just to clarify, until the extension mechanism is finalized I need
> > > be modifying scdl files in the webapp-host.jar to get my binding
> > > picked up?
> >
> >
> > Thats right, or alternatively use your own version of the
> webapp.system.scdl
> > file in your web app.
> >
> > ...ant
> >
> >
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: tuscany-dev-unsubscribe@ws.apache.org
> For additional commands, e-mail: tuscany-dev-help@ws.apache.org
>
>
Re: Problems with porting jsonrpc binding
Posted by Bert Lamb <al...@pobox.com>.
Ok, so the good news is that I got the binding and the sample working
when modifying the webapp.system.scdl in webapp-host.jar.
I decided it would be cleaner though to create my own copy of
webapp.system.scdl (and call it jsonrpc.system.scdl) to put in my
hello world webapp. I tried this and modified the web.xml to have
<context-param>
<param-name>systemScdlPath</param-name>
<param-value>/META-INF/sca/jsonrpc.system.scdl</param-value>
</context-param>
However, this gives me a "Null system SCDL URL" Exception thrown. I
looked at ServletLauncherListener.java and it looks like the
systemScdlPath URL is being loaded with a different classloader than
the applicationScdlPath which may be leading to the exception.
Guess I'll just stick with hacking into webapp-host.jar for now,
unless there is something I'm missing?
-Bert
On 8/24/06, ant elder <an...@gmail.com> wrote:
> On 8/24/06, Bert Lamb <al...@pobox.com> wrote:
>
> <snip/>
>
> So just to clarify, until the extension mechanism is finalized I need
> > be modifying scdl files in the webapp-host.jar to get my binding
> > picked up?
>
>
> Thats right, or alternatively use your own version of the webapp.system.scdl
> file in your web app.
>
> ...ant
>
>
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Re: Problems with porting jsonrpc binding
Posted by ant elder <an...@gmail.com>.
On 8/24/06, Bert Lamb <al...@pobox.com> wrote:
<snip/>
So just to clarify, until the extension mechanism is finalized I need
> be modifying scdl files in the webapp-host.jar to get my binding
> picked up?
Thats right, or alternatively use your own version of the webapp.system.scdl
file in your web app.
...ant