[jboss-dev-forums] [Design of EJB 3.0] - Reintroducing Asynchronous Support

[ALRubinger]

In writing EJB3 Proxy, and to prioritize compliance w/ TCK, we've dropped support for asynchronous invocations.  I'm now putting it back.

The previous implementation worked like:

* Get a traditional Proxy from JNDI
* Cast that to an interface implemented by all Proxies, "JBossProxy"
* Call Object myAsync = JBossProxy.getAsynchronousProxy();
* Cast myAsync to the the Business Interface to invoke
* Cast myAsync to AsynchProvider (org.jboss.aspects.asynch.AsynchProvider) to get the Future (org.jboss.aspects.asynch.Future)

...it looks like:

      StatefulRemote tester =
  |             (StatefulRemote) getInitialContext().lookup("StatefulBean/remote");
  |       assertEquals("Wrong return for stateful remote", 31, tester.method(31));
  | 
  |       StatefulRemote asynchTester = (StatefulRemote)((JBossProxy)tester).getAsynchronousProxy();
  |       assertEquals("Wrong return value for stateful remote", 0, asynchTester.method(32));
  |       AsynchProvider ap = (AsynchProvider) asynchTester;
  |       Future future = ap.getFuture();
  |       int ret = (Integer) future.get();
  |       assertEquals("Wrong async return value for stateful remote", ret, 32);

I want to change the following:

* Proxies should not be equipped with the facilities to return an asynchronous version of themselves.  I'd rather see another component take an existing proxy and async-ize it.  So async becomes a true add-on optional capability.
* Remove use of org.jboss.aspects.asynch.Future in favor of java.util.concurrent.Future

One hitch I see with Bill's Future implementations is that they directly support remoting via the AOP Dispatcher.  I want to simplify the whole thing by making the async client-side interceptor act like a regular client which carries the invocation as a j.u.c.FutureTask.

We'll see if I'm missing some reason why things were built as they were.

S,
ALR

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