All the magic relies on the AsyncService class, so we will focus on that.
First, we ask the server an instance of an executor:
@Resource(name = "LocalManagedScheduledExecutorService") private ManagedScheduledExecutorService executor;
But it is not just any executor—it's an executor that's specific to scheduling:
ScheduledFuture<User> result = executor.schedule(new AsyncTask(), 5, TimeUnit.SECONDS);
So, we are scheduling our task to be executed in five seconds. Note that we are also not using a regular Future, but ScheduledFuture.
The rest is a usual task execution:
while (!result.isDone()) { try { TimeUnit.SECONDS.sleep(1); } catch (InterruptedException ex) { System.err.println(ex.getMessage()); } }
And this is how we write ...
