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

This example Akka source code file (MembershipChangeListenerUpSpec.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

a, actor, akka, cluster, collection, currentclusterstate, longrunningtest, membershipchangelisteners, membershipchangelistenerupspec, memberup, multinodeclusterspec, set, test, testing, testlatch

The MembershipChangeListenerUpSpec.scala Akka example source code

/**
 * Copyright (C) 2009-2014 Typesafe Inc. <http://www.typesafe.com>
 */
package akka.cluster

import scala.collection.immutable.SortedSet
import com.typesafe.config.ConfigFactory
import akka.remote.testkit.MultiNodeConfig
import akka.remote.testkit.MultiNodeSpec
import akka.testkit._
import akka.actor.Props
import akka.actor.Actor
import akka.actor.Deploy

object MembershipChangeListenerUpMultiJvmSpec extends MultiNodeConfig {
  val first = role("first")
  val second = role("second")
  val third = role("third")

  commonConfig(debugConfig(on = false).withFallback(MultiNodeClusterSpec.clusterConfigWithFailureDetectorPuppet))
}

class MembershipChangeListenerUpMultiJvmNode1 extends MembershipChangeListenerUpSpec
class MembershipChangeListenerUpMultiJvmNode2 extends MembershipChangeListenerUpSpec
class MembershipChangeListenerUpMultiJvmNode3 extends MembershipChangeListenerUpSpec

abstract class MembershipChangeListenerUpSpec
  extends MultiNodeSpec(MembershipChangeListenerUpMultiJvmSpec)
  with MultiNodeClusterSpec {

  import MembershipChangeListenerUpMultiJvmSpec._
  import ClusterEvent._

  "A set of connected cluster systems" must {

    "(when two nodes) after cluster convergence updates the membership table then all MembershipChangeListeners should be triggered" taggedAs LongRunningTest in {

      awaitClusterUp(first)

      runOn(first, second) {
        val latch = TestLatch()
        val expectedAddresses = Set(first, second) map address
        cluster.subscribe(system.actorOf(Props(new Actor {
          var members = Set.empty[Member]
          def receive = {
            case state: CurrentClusterState ⇒ members = state.members
            case MemberUp(m) ⇒
              members = members - m + m
              if (members.map(_.address) == expectedAddresses)
                latch.countDown()
            case _ ⇒ // ignore
          }
        }).withDeploy(Deploy.local)), classOf[MemberEvent])
        enterBarrier("listener-1-registered")
        cluster.join(first)
        latch.await
      }

      runOn(third) {
        enterBarrier("listener-1-registered")
      }

      enterBarrier("after-1")
    }

    "(when three nodes) after cluster convergence updates the membership table then all MembershipChangeListeners should be triggered" taggedAs LongRunningTest in {

      val latch = TestLatch()
      val expectedAddresses = Set(first, second, third) map address
      cluster.subscribe(system.actorOf(Props(new Actor {
        var members = Set.empty[Member]
        def receive = {
          case state: CurrentClusterState ⇒ members = state.members
          case MemberUp(m) ⇒
            members = members - m + m
            if (members.map(_.address) == expectedAddresses)
              latch.countDown()
          case _ ⇒ // ignore
        }
      }).withDeploy(Deploy.local)), classOf[MemberEvent])
      enterBarrier("listener-2-registered")

      runOn(third) {
        cluster.join(first)
      }

      latch.await

      enterBarrier("after-2")
    }
  }
}

Other Akka source code examples

Here is a short list of links related to this Akka MembershipChangeListenerUpSpec.scala source code file:

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