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

This example Akka source code file (NodeMembershipSpec.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, akka, cluster, longrunningtest, multinodeclusterspec, multinodeconfig, multinodespec, nodemembershipmultijvmnode1, nodemembershipmultijvmnode2, nodemembershipmultijvmnode3, nodemembershipmultijvmspec, nodemembershipspec, test, testing, testkit

The NodeMembershipSpec.scala Akka example source code

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

import com.typesafe.config.ConfigFactory
import akka.remote.testkit.MultiNodeConfig
import akka.remote.testkit.MultiNodeSpec
import akka.testkit._

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

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

class NodeMembershipMultiJvmNode1 extends NodeMembershipSpec
class NodeMembershipMultiJvmNode2 extends NodeMembershipSpec
class NodeMembershipMultiJvmNode3 extends NodeMembershipSpec

abstract class NodeMembershipSpec
  extends MultiNodeSpec(NodeMembershipMultiJvmSpec)
  with MultiNodeClusterSpec {

  import NodeMembershipMultiJvmSpec._

  "A set of connected cluster systems" must {

    "(when two nodes) start gossiping to each other so that both nodes gets the same gossip info" taggedAs LongRunningTest in {

      // make sure that the node-to-join is started before other join
      runOn(first) {
        startClusterNode()
      }
      enterBarrier("first-started")

      runOn(first, second) {
        cluster.join(first)
        awaitAssert(clusterView.members.size should be(2))
        assertMembers(clusterView.members, first, second)
        awaitAssert(clusterView.members.map(_.status) should be(Set(MemberStatus.Up)))
      }

      enterBarrier("after-1")
    }

    "(when three nodes) start gossiping to each other so that all nodes gets the same gossip info" taggedAs LongRunningTest in {

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

      awaitAssert(clusterView.members.size should be(3))
      assertMembers(clusterView.members, first, second, third)
      awaitAssert(clusterView.members.map(_.status) should be(Set(MemberStatus.Up)))

      enterBarrier("after-2")
    }

    "correct member age" taggedAs LongRunningTest in {
      val firstMember = clusterView.members.find(_.address == address(first)).get
      val secondMember = clusterView.members.find(_.address == address(second)).get
      val thirdMember = clusterView.members.find(_.address == address(third)).get
      firstMember.isOlderThan(thirdMember) should be(true)
      thirdMember.isOlderThan(firstMember) should be(false)
      secondMember.isOlderThan(thirdMember) should be(true)
      thirdMember.isOlderThan(secondMember) should be(false)

      enterBarrier("after-3")

    }
  }
}