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

This example Akka source code file (Extra.scala) 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, akka, cluster, clusterroutergroup, clusterroutergroupsettings, clusterrouterpool, clusterrouterpoolsettings, factorial, factorialfrontend2, factorialfrontend3, list, some, systemloadaveragemetricsselector

The Extra.scala Akka example source code

package sample.cluster.factorial

import akka.actor.Props
import akka.actor.Actor

// not used, only for documentation
abstract class FactorialFrontend2 extends Actor {
  //#router-lookup-in-code
  import akka.cluster.routing.ClusterRouterGroup
  import akka.cluster.routing.ClusterRouterGroupSettings
  import akka.cluster.routing.AdaptiveLoadBalancingGroup
  import akka.cluster.routing.HeapMetricsSelector

  val backend = context.actorOf(
    ClusterRouterGroup(AdaptiveLoadBalancingGroup(HeapMetricsSelector),
      ClusterRouterGroupSettings(
        totalInstances = 100, routeesPaths = List("/user/factorialBackend"),
        allowLocalRoutees = true, useRole = Some("backend"))).props(),
    name = "factorialBackendRouter2")
  //#router-lookup-in-code
}

// not used, only for documentation
abstract class FactorialFrontend3 extends Actor {
  //#router-deploy-in-code
  import akka.cluster.routing.ClusterRouterPool
  import akka.cluster.routing.ClusterRouterPoolSettings
  import akka.cluster.routing.AdaptiveLoadBalancingPool
  import akka.cluster.routing.SystemLoadAverageMetricsSelector

  val backend = context.actorOf(
    ClusterRouterPool(AdaptiveLoadBalancingPool(
      SystemLoadAverageMetricsSelector), ClusterRouterPoolSettings(
      totalInstances = 100, maxInstancesPerNode = 3,
      allowLocalRoutees = false, useRole = Some("backend"))).props(Props[FactorialBackend]),
    name = "factorialBackendRouter3")
  //#router-deploy-in-code
}