package docs.cluster;

import akka.cluster.routing.ClusterRouterGroup;
import akka.cluster.routing.ClusterRouterGroupSettings;
import akka.cluster.routing.ClusterRouterPool;
import akka.cluster.routing.ClusterRouterPoolSettings;
import akka.routing.ConsistentHashingGroup;
import akka.routing.ConsistentHashingPool;
import docs.cluster.StatsMessages.StatsJob;
import akka.actor.ActorRef;
import akka.actor.Props;
import akka.actor.UntypedActor;
import akka.routing.ConsistentHashingRouter.ConsistentHashableEnvelope;
import akka.routing.FromConfig;

import java.util.Collections;

//#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

//not used, only for documentation
abstract class StatsService2 extends UntypedActor {
  //#router-lookup-in-code
  int totalInstances = 100;
  Iterable<String> routeesPaths = Collections
    .singletonList("/user/statsWorker");
  boolean allowLocalRoutees = true;
  String useRole = "compute";
  ActorRef workerRouter = getContext().actorOf(
    new ClusterRouterGroup(new ConsistentHashingGroup(routeesPaths),
      new ClusterRouterGroupSettings(totalInstances, routeesPaths,
        allowLocalRoutees, useRole)).props(), "workerRouter2");
  //#router-lookup-in-code
}

//not used, only for documentation
abstract class StatsService3 extends UntypedActor {
  //#router-deploy-in-code
  int totalInstances = 100;
  int maxInstancesPerNode = 3;
  boolean allowLocalRoutees = false;
  String useRole = "compute";
  ActorRef workerRouter = getContext().actorOf(
    new ClusterRouterPool(new ConsistentHashingPool(0),
      new ClusterRouterPoolSettings(totalInstances, maxInstancesPerNode,
        allowLocalRoutees, useRole)).props(Props
          .create(StatsWorker.class)), "workerRouter3");
  //#router-deploy-in-code
}