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scala – 测试与TestActorRef mixin Stash的Akka演员

发布时间：2020-12-16 19:07:28 所属栏目：安全 来源：网络整理
导读：我正在遇到一个扩展Stash的演员的问题,当在一个简单的ActorSystem中用actorOf实例化它时,它工作得很好.现在,我实际上想在我的程序中使用它们之前,先为我的乱七八糟的演员写一些测试.但是我无法找到在我的测试套件中使用TestActorRef与此演员的方法. 工作原理
我正在遇到一个扩展Stash的演员的问题,当在一个简单的ActorSystem中用actorOf实例化它时,它工作得很好.现在,我实际上想在我的程序中使用它们之前,先为我的乱七八糟的演员写一些测试.但是我无法找到在我的测试套件中使用TestActorRef与此演员的方法.

工作原理的代码如下所示：

import akka.actor.{Stash,Actor,ActorSystem,Props}
import com.typesafe.config.ConfigFactory

object StashTest {
  val config = ConfigFactory.parseString(
    """
      |akka.actor.default-mailbox {
      | mailbox-type = "akka.dispatch.UnboundedDequeBasedMailbox"
      |}
    """.stripMargin)
}

class StashTestActor extends Stash {

  def receive: Actor.Receive = {
    case "unstash" =>
      unstashAll()
      context become print
    case msg => stash()
  }

  def print: Actor.Receive = {
    case msg => println(s"Unstashed message: $msg")
  }
}

val system = ActorSystem("stashSystem",StashTest.config)
val ref = system.actorOf(Props[StashTestActor])

ref ! "stash me"
ref ! "blah"
ref ! "unstash"

哪个打印

Unstashed message: stash me

Unstashed message: blah

但是如果我尝试为这个演员编写一个WordSpec测试,那么我会有一些令人讨厌的例外,我无法弄清楚他们希望我在代码中改变什么.

测试类看起来像这样

import akka.testkit.{TestActorRef,TestKit}
import akka.actor.{Stash,ActorSystem}
import org.scalatest.{WordSpecLike,MustMatchers}
import com.typesafe.config.ConfigFactory


class StashTestActor extends Stash {

  def receive: Actor.Receive = {
    case "unstash" =>
      unstashAll()
      context become print
    case msg => stash()
  }

  def print: Actor.Receive = {
    case msg => println(s"Unstashed message: $msg")
  }
}


class StashTest extends TestKit(ActorSystem("testSystem",StashTest.config))
with WordSpecLike
with MustMatchers {

  "A simple stashing actor" must {
    val actorRef = TestActorRef[StashTestActor]

    "stash messages" in {
      actorRef ! "stash me!"
    }

    "unstash all messages" in {
      actorRef ! "unstash"
    }
  }
}

object StashTest {
  val config = ConfigFactory.parseString(
    """
      |akka.actor.default-mailbox {
      | mailbox-type = "akka.dispatch.UnboundedDequeBasedMailbox"
      |}
    """.stripMargin)
}

运行测试时,我会得到以下异常,在TestActorRef的实例化过程中抛出异常.

[ERROR] [08/20/2013 14:19:40.765] [testSystem-akka.actor.default-dispatcher-3] [akka://testSystem/user/$$a] Could not instantiate Actor
Make sure Actor is NOT defined inside a class/trait,if so put it outside the class/trait,f.e. in a companion object,OR try to change: 'actorOf(Props[MyActor]' to 'actorOf(Props(new MyActor)'.
akka.actor.ActorInitializationException: exception during creation
    at akka.actor.ActorInitializationException$.apply(Actor.scala:218)
    at akka.actor.ActorCell.create(ActorCell.scala:578)
    at akka.actor.ActorCell.invokeAll$1(ActorCell.scala:425)
    at akka.actor.ActorCell.systemInvoke(ActorCell.scala:447)
    at akka.dispatch.Mailbox.processAllSystemMessages(Mailbox.scala:262)
    at akka.testkit.CallingThreadDispatcher.process$1(CallingThreadDispatcher.scala:244)
    at akka.testkit.CallingThreadDispatcher.runQueue(CallingThreadDispatcher.scala:284)
    at akka.testkit.CallingThreadDispatcher.register(CallingThreadDispatcher.scala:153)
    at akka.dispatch.MessageDispatcher.attach(AbstractDispatcher.scala:133)
    at akka.actor.dungeon.Dispatch$class.start(Dispatch.scala:84)
    at akka.actor.ActorCell.start(ActorCell.scala:338)
    at akka.testkit.TestActorRef.<init>(TestActorRef.scala:50)
    at akka.testkit.TestActorRef$.apply(TestActorRef.scala:141)
    at akka.testkit.TestActorRef$.apply(TestActorRef.scala:137)
    at akka.testkit.TestActorRef$.apply(TestActorRef.scala:146)
    at akka.testkit.TestActorRef$.apply(TestActorRef.scala:144)
    at stashActorTest.StashTest$$anonfun$1.apply$mcV$sp(StashTestActor.scala:29)
    at stashActorTest.StashTest$$anonfun$1.apply(StashTestActor.scala:28)
    at stashActorTest.StashTest$$anonfun$1.apply(StashTestActor.scala:28)
    at org.scalatest.SuperEngine.registerNestedBranch(Engine.scala:613)
    at org.scalatest.WordSpecLike$class.org$scalatest$WordSpecLike$$registerBranch(WordSpecLike.scala:120)
    at org.scalatest.WordSpecLike$$anon$2.apply(WordSpecLike.scala:851)
    at org.scalatest.words.MustVerb$StringMustWrapperForVerb$class.must(MustVerb.scala:189)
    at org.scalatest.matchers.MustMatchers$StringMustWrapper.must(MustMatchers.scala:6167)
    at stashActorTest.StashTest.<init>(StashTestActor.scala:28)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:526)
    at java.lang.Class.newInstance(Class.java:374)
    at org.scalatest.tools.Framework$ScalaTestTask.execute(Framework.scala:444)
    at sbt.TestRunner.runTest$1(TestFramework.scala:84)
    at sbt.TestRunner.run(TestFramework.scala:94)
    at sbt.TestFramework$$anon$2$$anonfun$$init$$1$$anonfun$apply$8.apply(TestFramework.scala:224)
    at sbt.TestFramework$$anon$2$$anonfun$$init$$1$$anonfun$apply$8.apply(TestFramework.scala:224)
    at sbt.TestFramework$.sbt$TestFramework$$withContextLoader(TestFramework.scala:212)
    at sbt.TestFramework$$anon$2$$anonfun$$init$$1.apply(TestFramework.scala:224)
    at sbt.TestFramework$$anon$2$$anonfun$$init$$1.apply(TestFramework.scala:224)
    at sbt.TestFunction.apply(TestFramework.scala:229)
    at sbt.Tests$$anonfun$7.apply(Tests.scala:196)
    at sbt.Tests$$anonfun$7.apply(Tests.scala:196)
    at sbt.std.Transform$$anon$3$$anonfun$apply$2.apply(System.scala:45)
    at sbt.std.Transform$$anon$3$$anonfun$apply$2.apply(System.scala:45)
    at sbt.std.Transform$$anon$4.work(System.scala:64)
    at sbt.Execute$$anonfun$submit$1$$anonfun$apply$1.apply(Execute.scala:237)
    at sbt.Execute$$anonfun$submit$1$$anonfun$apply$1.apply(Execute.scala:237)
    at sbt.ErrorHandling$.wideConvert(ErrorHandling.scala:18)
    at sbt.Execute.work(Execute.scala:244)
    at sbt.Execute$$anonfun$submit$1.apply(Execute.scala:237)
    at sbt.Execute$$anonfun$submit$1.apply(Execute.scala:237)
    at sbt.ConcurrentRestrictions$$anon$4$$anonfun$1.apply(ConcurrentRestrictions.scala:160)
    at sbt.CompletionService$$anon$2.call(CompletionService.scala:30)
    at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)
    at java.util.concurrent.FutureTask.run(FutureTask.java:166)
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
    at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)
    at java.util.concurrent.FutureTask.run(FutureTask.java:166)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
    at java.lang.Thread.run(Thread.java:724)
Caused by: akka.actor.ActorInitializationException: Could not instantiate Actor
Make sure Actor is NOT defined inside a class/trait,OR try to change: 'actorOf(Props[MyActor]' to 'actorOf(Props(new MyActor)'.
    at akka.actor.ActorInitializationException$.apply(Actor.scala:218)
    at akka.testkit.TestActorRef$$anonfun$apply$2$$anonfun$apply$1.applyOrElse(TestActorRef.scala:148)
    at akka.testkit.TestActorRef$$anonfun$apply$2$$anonfun$apply$1.applyOrElse(TestActorRef.scala:147)
    at scala.runtime.AbstractPartialFunction.apply(AbstractPartialFunction.scala:33)
    at scala.util.Failure$$anonfun$recover$1.apply(Try.scala:185)
    at scala.util.Try$.apply(Try.scala:161)
    at scala.util.Failure.recover(Try.scala:185)
    at akka.testkit.TestActorRef$$anonfun$apply$2.apply(TestActorRef.scala:147)
    at akka.testkit.TestActorRef$$anonfun$apply$2.apply(TestActorRef.scala:153)
    at akka.actor.CreatorFunctionConsumer.produce(Props.scala:369)
    at akka.actor.Props.newActor(Props.scala:323)
    at akka.actor.ActorCell.newActor(ActorCell.scala:534)
    at akka.actor.ActorCell.create(ActorCell.scala:560)
    ... 58 more
Caused by: java.lang.NullPointerException
    at akka.actor.UnrestrictedStash$class.$init$(Stash.scala:82)
    at stashActorTest.StashTestActor.<init>(StashTestActor.scala:9)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:526)
    at akka.actor.ReflectiveDynamicAccess$$anonfun$createInstanceFor$2.apply(DynamicAccess.scala:78)
    at scala.util.Try$.apply(Try.scala:161)
    at akka.actor.ReflectiveDynamicAccess.createInstanceFor(DynamicAccess.scala:73)
    ... 64 more

对于没有扩展Stash的actors使用TestActorRefs,我没有任何问题.所以我不知道这是一个配置错误还是别的东西我都缺少.

解决方法

TestActorRef不能与Stash一起使用. TestActorRef需要一个CallingThreadMailbox和Stash需要DequeBasedMessageQueueSemantics. The documentation should include this limitation and the error messages should be improved.

（编辑：李大同）

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