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

This example Akka source code file (RemoteDeathWatchSpec.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, actoridentity, akka, concurrent, deathwatchspec, defaulttimeout, implicitsender, nobody, none, rootactorpath, terminated, test, testing, testprobe, time

The RemoteDeathWatchSpec.scala Akka example source code

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

import akka.testkit._
import akka.actor._
import com.typesafe.config.ConfigFactory
import akka.actor.RootActorPath
import scala.concurrent.duration._
import akka.TestUtils
import akka.event.Logging.Warning

@org.junit.runner.RunWith(classOf[org.scalatest.junit.JUnitRunner])
class RemoteDeathWatchSpec extends AkkaSpec(ConfigFactory.parseString("""
akka {
    actor {
        provider = "akka.remote.RemoteActorRefProvider"
        deployment {
            /watchers.remote = "akka.tcp://other@localhost:2666"
        }
    }
    remote.retry-gate-closed-for = 1 s
    remote.initial-system-message-delivery-timeout = 3 s
    remote.netty.tcp {
        hostname = "localhost"
        port = 0
    }
}
""")) with ImplicitSender with DefaultTimeout with DeathWatchSpec {

  val other = ActorSystem("other", ConfigFactory.parseString("akka.remote.netty.tcp.port=2666")
    .withFallback(system.settings.config))

  override def beforeTermination() {
    system.eventStream.publish(TestEvent.Mute(
      EventFilter.warning(pattern = "received dead letter.*Disassociate")))
  }

  override def afterTermination() {
    shutdown(other)
  }

  override def expectedTestDuration: FiniteDuration = 120.seconds

  "receive Terminated when system of de-serialized ActorRef is not running" in {
    val probe = TestProbe()
    system.eventStream.subscribe(probe.ref, classOf[QuarantinedEvent])
    val rarp = RARP(system).provider
    // pick an unused port
    val port = TestUtils.temporaryServerAddress().getPort
    // simulate de-serialized ActorRef
    val ref = rarp.resolveActorRef(s"akka.tcp://OtherSystem@localhost:$port/user/foo/bar#1752527294")
    system.actorOf(Props(new Actor {
      context.watch(ref)
      def receive = {
        case Terminated(r) ⇒ testActor ! r
      }
    }).withDeploy(Deploy.local))

    expectMsg(20.seconds, ref)
    // we don't expect real quarantine when the UID is unknown, i.e. QuarantinedEvent is not published 
    probe.expectNoMsg(3.seconds)
    // The following verifies ticket #3870, i.e. make sure that re-delivery of Watch message is stopped.
    // It was observed as periodic logging of "address is now gated" when the gate was lifted.
    system.eventStream.subscribe(probe.ref, classOf[Warning])
    probe.expectNoMsg(rarp.remoteSettings.RetryGateClosedFor * 2)
  }

  "receive Terminated when watched node is unknown host" in {
    val path = RootActorPath(Address("akka.tcp", system.name, "unknownhost", 2552)) / "user" / "subject"
    system.actorOf(Props(new Actor {
      context.watch(context.actorFor(path))
      def receive = {
        case t: Terminated ⇒ testActor ! t.actor.path
      }
    }).withDeploy(Deploy.local), name = "observer2")

    expectMsg(60.seconds, path)
  }

  "receive ActorIdentity(None) when identified node is unknown host" in {
    val path = RootActorPath(Address("akka.tcp", system.name, "unknownhost2", 2552)) / "user" / "subject"
    system.actorSelection(path) ! Identify(path)
    expectMsg(60.seconds, ActorIdentity(path, None))
  }

  "quarantine systems after unsuccessful system message delivery if have not communicated before" in {
    // Synthesize an ActorRef to a remote system this one has never talked to before.
    // This forces ReliableDeliverySupervisor to start with unknown remote system UID.
    val extinctPath = RootActorPath(Address("akka.tcp", "extinct-system", "localhost", TestUtils.temporaryServerAddress().getPort)) / "user" / "noone"
    val transport = RARP(system).provider.transport
    val extinctRef = new RemoteActorRef(transport, transport.localAddressForRemote(extinctPath.address),
      extinctPath, Nobody, props = None, deploy = None)

    val probe = TestProbe()
    probe.watch(extinctRef)
    probe.unwatch(extinctRef)

    probe.expectNoMsg(5.seconds)
    system.eventStream.subscribe(probe.ref, classOf[Warning])
    probe.expectNoMsg(RARP(system).provider.remoteSettings.RetryGateClosedFor * 2)
  }

}