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

This example Akka source code file (EchoManager.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, akka, bind, bound, commandfailed, connected, echomanager, event, exception, io, loggingadapter, override, untypedactor

The EchoManager.java Akka example source code

/**
 * Copyright (C) 2009-2014 Typesafe Inc. <http://www.typesafe.com>
 */

package docs.io.japi;

import java.net.InetSocketAddress;

import akka.actor.ActorRef;
import akka.actor.Props;
import akka.actor.SupervisorStrategy;
import akka.actor.UntypedActor;
import akka.event.Logging;
import akka.event.LoggingAdapter;
import akka.io.Tcp;
import akka.io.Tcp.Bind;
import akka.io.Tcp.Bound;
import akka.io.Tcp.CommandFailed;
import akka.io.Tcp.Connected;
import akka.io.TcpMessage;

public class EchoManager extends UntypedActor {

  final LoggingAdapter log = Logging
      .getLogger(getContext().system(), getSelf());

  final Class<?> handlerClass;

  public EchoManager(Class<?> handlerClass) {
    this.handlerClass = handlerClass;
  }

  @Override
  public SupervisorStrategy supervisorStrategy() {
    return SupervisorStrategy.stoppingStrategy();
  }

  @Override
  public void preStart() throws Exception {
    //#manager
    final ActorRef tcpManager = Tcp.get(getContext().system()).manager();
    //#manager
    tcpManager.tell(
        TcpMessage.bind(getSelf(), new InetSocketAddress("localhost", 0), 100),
        getSelf());
  }

  @Override
  public void postRestart(Throwable arg0) throws Exception {
    // do not restart
    getContext().stop(getSelf());
  }

  @Override
  public void onReceive(Object msg) throws Exception {
    if (msg instanceof Bound) {
      log.info("listening on [{}]", ((Bound) msg).localAddress());
    } else if (msg instanceof Tcp.CommandFailed) {
      final CommandFailed failed = (CommandFailed) msg;
      if (failed.cmd() instanceof Bind) {
        log.warning("cannot bind to [{}]", ((Bind) failed.cmd()).localAddress());
        getContext().stop(getSelf());
      } else {
        log.warning("unknown command failed [{}]", failed.cmd());
      }
    } else
    if (msg instanceof Connected) {
      final Connected conn = (Connected) msg;
      log.info("received connection from [{}]", conn.remoteAddress());
      final ActorRef connection = getSender();
      final ActorRef handler = getContext().actorOf(
          Props.create(handlerClass, connection, conn.remoteAddress()));
      //#echo-manager
      connection.tell(TcpMessage.register(handler,
          true, // <-- keepOpenOnPeerClosed flag
          true), getSelf());
      //#echo-manager
    }
  }

}

Other Akka source code examples

Here is a short list of links related to this Akka EchoManager.java source code file:

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