Java Reference
In-Depth Information
Asynchronous Invocation with Dispatch
Problem
You are using the SAAJ API's
Dispatch
class to invoke a web service, and you want to per-
form the invocation asynchronously.
Solution
Create your
Dispatch
object as you normally would, and instead of calling the
invoke
meth-
od, call
invokeAsync
using one of the two supplied methods:
Response<T> invokeAsync(T msg)
Future<?> invokeAsync(T msg, AsyncHandler<T> handler)
Here is an example:
Dispatch<SOAPMessage> dispatch =
service.createDispatch(portQName, SOAPMessage.class,
Service.Mode.MESSAGE);
//Send the request and get the response
Response<Source> bookResponse = dispatch.invokeAsync(request);
Discussion
Other than the fact that you are getting the methods from the
Dispatch
object, the behavior of
the responses for both polling and callbacks is the same as with an SEI. With this method, you
haven't generated an SEI, but the work being done under the hood is the same, as JAX-WS
reuses SAAJ.
NOTE
Remember that before you attempt to call
invokeAsync
, you need to enable asynchronous map-
pings on the WSDL using the
JAX-WS:bindings
element. Otherwise, your invocations may appear
to succeed, but they won't actually be asynchronous. That is, they'll block, just like a normal call to
invoke
.
