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JAX-WS provides an easy mechanism for accessing services asynchronously. The SEI can specify additional methods that can be used to access a service asynchronously. The FUSE Services Framework code generators generate the extra methods for you. You simply add the business logic.
In addition to the usual synchronous mode of invocation, FUSE Services Framework supports two forms of asynchronous invocation:
Polling approach — To invoke the remote operation using the polling approach, you call a method that has no
output parameters, but returns a javax.xml.ws.Response object. The
Response object (which inherits from the
javax.util.concurrency.Future interface) can be polled to check whether or not a response
message has arrived.
Callback approach — To invoke the remote operation using the callback approach, you call a method that takes a
reference to a callback object (of javax.xml.ws.AsyncHandler type) as one of its parameters.
When the response message arrives at the client, the runtime calls back on the AsyncHandler object,
and gives it the contents of the response message.
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