Asynchronous invocation

Dispatch objects also support asynchronous invocations. As with the higher level asynchronous APIs discussed in Chapter 4, Dispatch objects can use both the polling approach and the callback approach.

When using the polling approach the invokeAsync() method returns a Response<t> object that can be periodically polled to see if the response has arrived.

Response <T> invokeAsync(T msg)
throws WebServiceException;

When using the callback approach the invokeAsync() method takes an AsyncHandler implementation that processes the response when it is returned.

Future<?> invokeAsync(T msg, AsyncHandler<T> handler)
throws WebServiceException;