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

This example Akka source code file (StatsSampleOneMaster.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, actorsystem, akka, array, cluster, clustersystem, pattern, poisonpill, props, seq, some, statssampleonemaster, statssampleonemasterclient, unit

The StatsSampleOneMaster.scala Akka example source code

package sample.cluster.stats

import com.typesafe.config.ConfigFactory
import akka.actor.ActorSystem
import akka.actor.PoisonPill
import akka.actor.Props
import akka.contrib.pattern.ClusterSingletonManager
import akka.contrib.pattern.ClusterSingletonProxy

object StatsSampleOneMaster {
  def main(args: Array[String]): Unit = {
    if (args.isEmpty) {
      startup(Seq("2551", "2552", "0"))
      StatsSampleOneMasterClient.main(Array.empty)
    } else {
      startup(args)
    }
  }

  def startup(ports: Seq[String]): Unit = {
    ports foreach { port =>
      // Override the configuration of the port when specified as program argument
      val config =
        ConfigFactory.parseString(s"akka.remote.netty.tcp.port=" + port).withFallback(
          ConfigFactory.parseString("akka.cluster.roles = [compute]")).
          withFallback(ConfigFactory.load("stats2"))

      val system = ActorSystem("ClusterSystem", config)

      //#create-singleton-manager
      system.actorOf(ClusterSingletonManager.props(
        singletonProps = Props[StatsService], singletonName = "statsService",
        terminationMessage = PoisonPill, role = Some("compute")),
        name = "singleton")
      //#create-singleton-manager

      //#singleton-proxy
      system.actorOf(ClusterSingletonProxy.props(singletonPath = "/user/singleton/statsService",
        role = Some("compute")), name = "statsServiceProxy")
      //#singleton-proxy
    }
  }
}

object StatsSampleOneMasterClient {
  def main(args: Array[String]): Unit = {
    // note that client is not a compute node, role not defined
    val system = ActorSystem("ClusterSystem")
    system.actorOf(Props(classOf[StatsSampleClient], "/user/statsServiceProxy"), "client")
  }
}