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

This example Akka source code file (Extra.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, adaptiveloadbalancinggroup, akka, cluster, clusterroutergroup, clusterroutergroupsettings, clusterrouterpool, factorialfrontend2, factorialfrontend3, iterable, route, router, routing, string, untypedactor

The Extra.java Akka example source code

package sample.cluster.factorial;

import java.util.Arrays;
import java.util.Collections;

import akka.actor.ActorRef;
import akka.actor.Props;
import akka.actor.UntypedActor;
import akka.cluster.routing.AdaptiveLoadBalancingGroup;
import akka.cluster.routing.AdaptiveLoadBalancingPool;
import akka.cluster.routing.ClusterRouterGroup;
import akka.cluster.routing.ClusterRouterGroupSettings;
import akka.cluster.routing.ClusterRouterPool;
import akka.cluster.routing.ClusterRouterPoolSettings;
import akka.cluster.routing.HeapMetricsSelector;
import akka.cluster.routing.SystemLoadAverageMetricsSelector;

//not used, only for documentation
abstract class FactorialFrontend2 extends UntypedActor {
  //#router-lookup-in-code
  int totalInstances = 100;
  Iterable<String> routeesPaths = Arrays.asList("/user/factorialBackend", "");
  boolean allowLocalRoutees = true;
  String useRole = "backend";
  ActorRef backend = getContext().actorOf(
      new ClusterRouterGroup(new AdaptiveLoadBalancingGroup(
          HeapMetricsSelector.getInstance(), Collections.<String> emptyList()),
          new ClusterRouterGroupSettings(totalInstances, routeesPaths,
              allowLocalRoutees, useRole)).props(), "factorialBackendRouter2");
  //#router-lookup-in-code
}

//not used, only for documentation
abstract class FactorialFrontend3 extends UntypedActor {
  //#router-deploy-in-code
  int totalInstances = 100;
  int maxInstancesPerNode = 3;
  boolean allowLocalRoutees = false;
  String useRole = "backend";
  ActorRef backend = getContext().actorOf(
      new ClusterRouterPool(new AdaptiveLoadBalancingPool(
          SystemLoadAverageMetricsSelector.getInstance(), 0),
          new ClusterRouterPoolSettings(totalInstances, maxInstancesPerNode,
              allowLocalRoutees, useRole)).props(Props
          .create(FactorialBackend.class)), "factorialBackendRouter3");
  //#router-deploy-in-code
}