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WS-BPEL 2.0 Beginner's Guide by Denis Weerasiri, Matjaz B. Juric

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Understanding asynchronous service invocations

Unlike in a synchronous web service invocation, both parties act as client and server during an asynchronous web service invocation. So when sending the request, the BPEL process acts as the client and the external service becomes the server for the particular conversation. Then when the external service sends the response, external service is the client and the BPEL process is the server for that particular conversation.

In contrast with a synchronous web service invocation, those two client-server conversations should be defined separately in an asynchronous web service invocation. Now we will analyze the difference between a synchronous and an asynchronous invocation.

If you consider the implementation ...

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