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

This example Akka source code file (SmallestMailboxSpec.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, akkaspec, concurrent, concurrenthashmap, defaulttimeout, implicitsender, int, props, routing, smallestmailboxspec, string, test, testing, testlatch, time

The SmallestMailboxSpec.scala Akka example source code

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

import java.util.concurrent.ConcurrentHashMap
import scala.concurrent.Await
import scala.concurrent.duration._
import akka.actor.{ Props, Actor }
import akka.testkit.{ TestLatch, ImplicitSender, DefaultTimeout, AkkaSpec }

@org.junit.runner.RunWith(classOf[org.scalatest.junit.JUnitRunner])
class SmallestMailboxSpec extends AkkaSpec("akka.actor.serialize-messages = off")
  with DefaultTimeout with ImplicitSender {

  "smallest mailbox pool" must {

    "deliver messages to idle actor" in {
      val usedActors = new ConcurrentHashMap[Int, String]()
      val router = system.actorOf(SmallestMailboxPool(3).props(routeeProps = Props(new Actor {
        def receive = {
          case (busy: TestLatch, receivedLatch: TestLatch) ⇒
            usedActors.put(0, self.path.toString)
            self ! "another in busy mailbox"
            receivedLatch.countDown()
            Await.ready(busy, TestLatch.DefaultTimeout)
          case (msg: Int, receivedLatch: TestLatch) ⇒
            usedActors.put(msg, self.path.toString)
            receivedLatch.countDown()
          case s: String ⇒
        }
      })))

      val busy = TestLatch(1)
      val received0 = TestLatch(1)
      router ! ((busy, received0))
      Await.ready(received0, TestLatch.DefaultTimeout)

      val received1 = TestLatch(1)
      router ! ((1, received1))
      Await.ready(received1, TestLatch.DefaultTimeout)

      val received2 = TestLatch(1)
      router ! ((2, received2))
      Await.ready(received2, TestLatch.DefaultTimeout)

      val received3 = TestLatch(1)
      router ! ((3, received3))
      Await.ready(received3, TestLatch.DefaultTimeout)

      busy.countDown()

      val busyPath = usedActors.get(0)
      busyPath should not be (null)

      val path1 = usedActors.get(1)
      val path2 = usedActors.get(2)
      val path3 = usedActors.get(3)

      path1 should not be (busyPath)
      path2 should not be (busyPath)
      path3 should not be (busyPath)

    }
  }

}