Keeping a long-running process executing in an asynchronous fashion using CDI, EJB and JSF 2.

asyncPoll.xhtml

<a4j:poll id="poll" interval="5000" 
	execute="@this"
	render="@form" enabled="#{not (asyncProcessManager.isDone(selectedProcess))}"/>

AsyncProcessManager.java

@ApplicationScoped
public class AsyncProcessManager implements Serializable {

	private Map<AsyncProcess, Future<Object>> asyncProcesses = new ConcurrentHashMap<AsyncProcess, Future<Object>>();

	public void addProcess(AsyncProcess process) {
		// put the process into the map.
	}

	public void removeProcess(AsyncProcess process) {
		// remove the process from the map.
	}

	public boolean existsProcessFor(User user) {
		// check if there is any process for the user.
	}

	public boolean isDone(AsyncProcess process) {
		Future<Object> theAsyncExecution = findAsyncExecutionFor(process);
		
		return theAsyncExecution != null && theAsyncExecution.isDone();
	}

}

AsyncService.java

@Singleton
@TransactionAttribute(TransactionAttributeType.NEVER) // useful when you need to turn off the EJB transaction control.
public class AsyncService implements Serializable {

	private Repository repository;

	@Asynchronous
	@Lock(LockType.READ)
	@AccessTimeout(-1)
	public Future<Object> operation1() {
		// implementation		
		return new AsyncResult<Object>(null);
	}

	@Asynchronous
	@Lock(LockType.READ)
	@AccessTimeout(-1)
	public Future<Object> operation2() {
		// implementation		
		return new AsyncResult<Object>(null);
	}

	@Asynchronous
	@Lock(LockType.READ)
	@AccessTimeout(-1)
	public Future<Object> operationN() {
		// implementation		
		return new AsyncResult<Object>(null);
	}

}