Service architecture using SOAPProcessor & EJBProcessor

[steelman22]

Hello there,

There is an RMI-based service provider A which I would like to expose to client B as a WebService.

To do it I create an ESB service (base on webservice_producer sample) which is using SOAPProcessor.

Here is the code (stripped for visibility):

<service category="SiusSellerService" name="WSWrapper" description="WS Frontend speaks natively to the ESB">

    <listeners>

        <jbr-listener name="Http-Gateway" busidref="Http-1" is-gateway="true"/>

        <jms-listener name="JMS-ESBListener" busidref="SiusSellerServiceEsbChannel"/>

    </listeners>

    <actions>

        <action name="JBossWSAdapter" class="org.jboss.soa.esb.actions.soap.SOAPProcessor">

            <property name="jbossws-endpoint" value="ServiceProviderAWS"/>

        </action>

    </actions>

</service>

ServiceProviderAWS is a simple JWS, like the one in sample. Inside I call service A like this:

Registry registry =  LocateRegistry.getRegistry(RMI_REG_HOST,RMI_REG_PORT);

RemoteRMIService service = (RemoteRMIService) registry.lookup(SERVICE_NAME);

someList = service.getSomethingMethod();

...

return someList;

It works quite fine.

Now I have another service provider - E - it is EJB 3.0 with some methods. I would also like to expose it to client B as a WS.

I'm wondering how to do it. My idea is to create two new Actions: EJBProcessor and MyCustomAction.

Action pipeline would look like this:

MyCustomAction ----->EJBProcessor ------>SOAPProcessor

MyCustomAction would take the ESBMessage, extract what is the name of the method that WSClient B wants to call on the WS (the one backing EJB), save the name in the body of the ESBMessage - keyed for example with  'method-to-call'.

EJBProcessor would use value  'method-to-call' as a value for 'method' property. Call EJB and put returned value in ESBMessage's body as 'ret-val'.

ServiceProviderAWS would not call RMI service as in the code above but would simply do smth like that:

someList = esbMessage.getBody().get('ret-val');

And SOAP response, prepared by ServiceProviderAWS, would be at the end sent to the client B, who called the WS.

Could you tell me if this is a right way to do it?

Thanks,

Matthew

[steelman22]

Actually, it may seem a bit silly because I'm trying to call EJB with EJBProcessor instead of calling it within JWS methods. Isn't it?

I'm a beginner when it comes to all that SOA stuff.