Frontend.java

package models.com.mc.workers;

import akka.actor.ActorRef;
import akka.actor.UntypedActor;
import akka.contrib.pattern.DistributedPubSubExtension;
import akka.contrib.pattern.DistributedPubSubMediator.Send;
import akka.dispatch.Mapper;
import akka.dispatch.Recover;
import akka.util.Timeout;
import scala.concurrent.ExecutionContext;
import scala.concurrent.Future;
import scala.concurrent.duration.Duration;

import java.io.Serializable;

import static akka.pattern.Patterns.pipe;
import static akka.pattern.Patterns.ask;

public class Frontend extends UntypedActor {


  final ActorRef mediator = DistributedPubSubExtension.get(getContext().system()).mediator();

  public void onReceive(Object message) {
    Future<Object> f =
      ask(mediator, new Send("/user/master/active", message, false), new Timeout(Duration.create(5, "seconds")));

    final ExecutionContext ec = getContext().system().dispatcher();

    Future<Object> res = f.map(new Mapper<Object, Object>() {
      @Override
      public Object apply(Object msg) {
        if (msg instanceof Master.Ack)
          return Ok.getInstance();
        else
          return super.apply(msg);
      }
    }, ec).recover(new Recover<Object>() {
      @Override
      public Object recover(Throwable failure) throws Throwable {
        return NotOk.getInstance();
      }
    }, ec);

    pipe(res, ec).to(getSender());
  }

  public static final class Ok implements Serializable {
    private Ok() {}

    private static final Ok instance = new Ok();

    public static Ok getInstance() {
      return instance;
    }

    @Override
    public String toString() {
      return "Ok";
    }
  };

  public static final class NotOk implements Serializable {
    private NotOk() {}

    private static final NotOk instance = new NotOk();

    public static NotOk getInstance() {
      return instance;
    }

    @Override
    public String toString() {
      return "NotOk";
    }
  };
}