Akka/Scala example source code file (Main2.java)

This example Akka source code file (Main2.java) is included in my "Source Code Warehouse" project. The intent of this project is to help you more easily find Akka and Scala source code examples by using tags.

All credit for the original source code belongs to akka.io; I'm just trying to make examples easier to find. (For my Scala work, see my Scala examples and tutorials.)

Akka tags/keywords

actor, actorref, actorsystem, akka, event, hello, loggingadapter, main2, override, terminated, terminator, untypedactor

The Main2.java Akka example source code

package sample.hello;

import akka.actor.ActorRef;
import akka.actor.ActorSystem;
import akka.actor.Props;
import akka.actor.Terminated;
import akka.actor.UntypedActor;
import akka.event.Logging;
import akka.event.LoggingAdapter;

public class Main2 {

  public static void main(String[] args) {
    ActorSystem system = ActorSystem.create("Hello");
    ActorRef a = system.actorOf(Props.create(HelloWorld.class), "helloWorld");
    system.actorOf(Props.create(Terminator.class, a), "terminator");
  }

  public static class Terminator extends UntypedActor {

    private final LoggingAdapter log = Logging.getLogger(getContext().system(), this);
    private final ActorRef ref;

    public Terminator(ActorRef ref) {
      this.ref = ref;
      getContext().watch(ref);
    }

    @Override
    public void onReceive(Object msg) {
      if (msg instanceof Terminated) {
        log.info("{} has terminated, shutting down system", ref.path());
        getContext().system().shutdown();
      } else {
        unhandled(msg);
      }
    }

  }
}