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

This example Akka source code file (StatsService.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, cluster, consistenthashableenvelope, override, route, router, routing, statsjob, statsservice, string, untypedactor

The StatsService.java Akka example source code

package sample.cluster.stats;

import sample.cluster.stats.StatsMessages.StatsJob;
import akka.actor.ActorRef;
import akka.actor.Props;
import akka.actor.UntypedActor;
import akka.routing.ConsistentHashingRouter.ConsistentHashableEnvelope;
import akka.routing.FromConfig;

//#service
public class StatsService extends UntypedActor {

  // This router is used both with lookup and deploy of routees. If you
  // have a router with only lookup of routees you can use Props.empty()
  // instead of Props.create(StatsWorker.class).
  ActorRef workerRouter = getContext().actorOf(
      FromConfig.getInstance().props(Props.create(StatsWorker.class)),
      "workerRouter");

  @Override
  public void onReceive(Object message) {
    if (message instanceof StatsJob) {
      StatsJob job = (StatsJob) message;
      if (job.getText().equals("")) {
        unhandled(message);
      } else {
        final String[] words = job.getText().split(" ");
        final ActorRef replyTo = getSender();

        // create actor that collects replies from workers
        ActorRef aggregator = getContext().actorOf(
            Props.create(StatsAggregator.class, words.length, replyTo));

        // send each word to a worker
        for (String word : words) {
          workerRouter.tell(new ConsistentHashableEnvelope(word, word),
              aggregator);
        }
      }

    } else {
      unhandled(message);
    }
  }
}

//#service