On Fri, Jun 20, 2008 at 11:28 AM, Richard Jones <[EMAIL PROTECTED]> wrote:
> Hi Simon, > > The Tuscany runtime runs SCA composite applications described in >> .composite >> files. Components within these composite files can define references and >> service and each can have bindings associated with them. When you specify >> a >> service binding, for example, binding.ws the runtime will do it's best to >> provide the endpoint that that binding describes and it may do slightly >> different things depending on how the runtime is being hosted, for >> example, >> >> If you are running from the command line and have a simple launcher than >> creates an SCADomain then to create HTTP endpoints for the web service >> bindings Tuscany will fire up an instance of Tomcat or Jetty depending on >> whether you have host-tomcat or host-jetty on the classpath. >> >> > > OK, I see! Very smart. > > If you are packaging Tuscany in a webapp and want to use the web service >> binding then we would expect you to have host-webapp on the classpath. >> This >> allows the runtime to use the servlet container where the webapp is >> running >> to provide the HTTP endpoints for bindings like binding.ws. >> >> The bottom line being that the composite file should fully describe the >> composite application and the runtime will honour what is in there. >> >> > > <snip/> > > > So the bit I'm stuck on here is how to create the SCADomain for the >>> HelloWorld example automatically: >>> >>> http://tuscany.apache.org/build-your-first-web-services-with-tuscany.html >>> >>> It looks as though the Eclipse plugin can take the HelloWorld.composite >>> and >>> turns it into a web application without having to add this extra layer of >>> a >>> ServletFilter and a JSP. The differences that I can see are that the >>> Calculator.composite doesn't define a service, and instead the >>> TuscanyServletFilter is reading in that file and then making itself the >>> effective web-service interface. Meanwhile, the HelloWorld example has a >>> different kind of definition: >>> >>> <component name="HelloWorldComponent"> >>> <implementation.java class="hw.HelloWorldImpl"/> >>> <service name="HelloWorld"> >>> <binding.ws uri="http://localhost:8080/HelloWorld"/> >>> </service> >>> </component> >>> >>> The Eclipse plugin looks like it understands how to take this service >>> binding and turn it into an actual service. I think what I need to know >>> is >>> how to deploy this particular type of composite definition (although I'm >>> also possibly off base here). >>> >>> >> >> >> There is a bit of slight of hand happening with the Eclipse plugin. The >> tutorial says... >> >> "First select the "helloworld.composite" file, in your "ws" project. >> *Right >> click* to get the >> context menu, select *Run As*, and then *Tuscany*. The Tuscany runtime >> will >> start up adding" >> >> What this is doing behind the scenes is passing "helloworld.composite" to >> a >> command line like launcher which fires up the Tuscany runtime to read the >> composite file and create the endpoints for the specified bindings. As the >> binding here is binding.ws here Tuscany will fire or Tomcat or Jetty to >> make >> it work. >> >> >> >> >>> I tried writing a Launch class as per: >>> >>> http://tuscany.apache.org/getting-started-with-tuscany.html >>> >>> which basically did: >>> >>> public static void main(String[] args) >>> throws Exception >>> { >>> SCADomain scaDomain = SCADomain.newInstance("HelloWorld.composite"); >>> System.in.read(); >>> scaDomain.close(); >>> } >>> >>> But this is throwing exceptions: >>> >>> Exception in thread "main" org.osoa.sca.ServiceRuntimeException: >>> org.osoa.sca.ServiceRuntimeException: java.lang.IllegalArgumentException: >>> Composite not found: HelloWorld.composite >>> >>> >> >> >> This should work but this error suggests that the composite file is not on >> your classpath. >> >> > > OK, so I've verified that the composite is on the classpath, but I'm still > getting the same error. I wedged in a check to show me where the file > actually is: > > public class Launch > { > public static void main(String[] args) > throws Exception > { > URL url = (new > Launch()).getClass().getResource("HelloWorld.composite"); > System.out.println(url.toString()); SCADomain scaDomain = > SCADomain.newInstance("HelloWorld.composite"); > } > } > > outputs: > > > file:/home/richard/workspace/tuscany-helloworld/out/production/tuscany-helloworld/hw/HelloWorld.composite > Exception in thread "main" org.osoa.sca.ServiceRuntimeException: > org.osoa.sca.ServiceRuntimeException: java.lang.IllegalArgumentException: > Composite not found: HelloWorld.composite > > Am I still missing something? I'm stumped :) > > * - what mechanism does SCADomain.newInstance use to locate the resource? >>> is it just a Class.getResource or somesuch? >>> >>> >>> >> >> Yes, Tuscany looks for the named file on the classpath and then uses the >> directory in which it finds that file as what SCA calls the contribution. >> The contribution should collect together all of the artifacts that are >> required to run the composite application, e.g. the composite file itself >> and the files that provide component implementations etc. >> >> > > OK, so I'm pretty certain that I've done this right, in that I have in the > directory: > > > file:/home/richard/workspace/tuscany-helloworld/out/production/tuscany-helloworld/hw/ > > The files: > > HelloWorld > HelloWorldImpl > HelloWorld.composite > Launch > > > Cheers, > > Richard > > -- > ======================================================================= > Richard Jones | Hewlett-Packard Limited > Research Engineer, HP Labs | registered office: > Bristol, UK | Cain Road, Bracknell, > | Berks, RG12 1HN. > | Registered No: 690597 England > eml: [EMAIL PROTECTED] ------------------------------------- > blg: http://chronicles-of-richard.blogspot.com/ > ----------------------------------------------------------------------- > The contents of this message and any attachments to it are confidential > and may be legally privileged. If you have received this message in > error, you should delete it from your system immediately and advise the > sender. To any recipient of this message within HP, unless otherwise > stated you should consider this message and attachments as "HP > CONFIDENTIAL". > ======================================================================== > > Hi Richard. Let me take a quick look at the code to remind myself what goes on behind the scenes here. In this particular case are you running this test from Eclipse or from the command line. If from Eclipse can you tell me what the output folder for this Eclipse project is set to. Is it file:/home/richard/workspace/tuscany-helloworld/out for example. Regards Simon
