Handling Future onSuccess as response from an Akka actor

Question

This is the code that works. It send a message to an Actor (Greeter) and wait for the answer back. But it blocks the current thread.

public class Future1Blocking {

    public static void main(String[] args) throws Exception {

        ActorSystem system = ActorSystem.create("system");
        final ActorRef actorRef = system.actorOf(Props.create(Greeter.class), "greeter");

        Timeout timeout = new Timeout(Duration.create(5, "seconds"));
        Future<Object> future = Patterns.ask(actorRef, Greeter.Msg.GREET, timeout);

        // this blocks current running thread
        Greeter.Msg result = (Greeter.Msg) Await.result(future, timeout.duration());

        System.out.println(result);

    }
}

What is the possible way for my example to use future.onSuccess to get the result without blocking the current calling thread?

Answer 1

Ahh. that's was easy (sorry).

future.onSuccess(new PrintResult<Object>(), system.dispatcher());

Where:

public final class PrintResult<T> extends OnSuccess<T> {
    @Override public final void onSuccess(T t) {
        System.out.println(t);
    }
}