儿童演员终止验证

时间：2015-01-11 17:05:03

标签： scala akka akka-testkit

我有以下actor层次结构父级 - ＆gt;孩子 - ＆gt;工人 孩子的生活范围要求很严格 - 当请求完成时，应该终止孩子的角色。我想验证作为测试的一部分。我创建了StepParent用于测试目的，因为我想验证给定请求的响应，该请求转发到msg到testprobe。

class StepParent(child: Props, name: String, probe: ActorRef) extends Actor with ActorLogging {
  context.watch(context.actorOf(props = child, name = name))

  override def receive: Actor.Receive = {
    case msg: PersistImages => context.children.foreach(child => child.tell(msg, sender))
    case msg =>
      log.debug(s"Msg forwarded to probe $msg")
      probe.tell(msg, sender)
  }
}

我的测试如下：

class ImagesControllerActorTest extends TestKit(ActorSystem("testsystem"))
with WordSpecLike with MustMatchers with StopSystemAfterAll {

  val id = "456"

  "ControllerActor" must {
    "distribute a work to dedicated dedicated workers and combine back results and then terminate" in {

      val p = TestProbe()
      val ica = system.actorOf(Props(classOf[StepParent], createActorWithMockedWorkers(id, p.ref), "ControllerActor", p.ref), "parent")

      p.send(ica, PersistImages(Set(new URL("http://success"), new URL("http://fail"))))

      p.expectMsgPF(2 seconds)(validMsgPersistImageActor)
      p.expectMsgPF(2 seconds)(validMsgPersistImageActor)

      p.expectMsg(2 seconds, ImagesProcessed(id, Set(new URI("file:/"))))

      p.expectMsg(4 seconds, Terminated)
    }
  }

由于上次检查预期消息，我的测试失败了：

assertion failed: timeout (4 seconds) during expectMsg while waiting for Terminated
java.lang.AssertionError: assertion failed: timeout (4 seconds) during expectMsg while waiting for Terminated
    at scala.Predef$.assert(Predef.scala:179)
    at akka.testkit.TestKitBase$class.expectMsg_internal(TestKit.scala:338)
...

根据详细日志终止msg也被转发（按照最后一行）

2015-01-11 17:41:10,386 [WARN ] [testsystem-akka.actor.default-dispatcher-5] akka.tcp://testsystem@127.0.0.1:2555/user/parent/ControllerActor - id: 456 image url: http://fail FAILED
2015-01-11 17:41:10,386 [INFO ] [testsystem-akka.actor.default-dispatcher-5] akka.tcp://testsystem@127.0.0.1:2555/user/parent/ControllerActor - id: 456 Processing completed with 1 downloded and 1 failed
2015-01-11 17:41:10,387 [DEBUG] [testsystem-akka.actor.default-dispatcher-4] akka.tcp://testsystem@127.0.0.1:2555/user/parent - Msg forwarded to probe ImagesProcessed(456,Set(file:/))
2015-01-11 17:41:10,392 [DEBUG] [testsystem-akka.actor.default-dispatcher-2] akka://testsystem/user/parent/ControllerActor/$b - stopped
2015-01-11 17:41:10,394 [DEBUG] [testsystem-akka.actor.default-dispatcher-5] akka://testsystem/user/parent/ControllerActor - stopping
2015-01-11 17:41:10,396 [INFO ] [testsystem-akka.actor.default-dispatcher-4] akka://testsystem/user/parent/ControllerActor/$b - Message [akka.dispatch.sysmsg.Terminate] from Actor[akka://testsystem/user/parent/ImagesControllerActor/$b#-426862126] to Actor[akka://testsystem/user/parent/ControllerActor/$b#-426862126] was not delivered. [1] dead letters encountered. This logging can be turned off or adjusted with configuration settings 'akka.log-dead-letters' and 'akka.log-dead-letters-during-shutdown'.
2015-01-11 17:41:10,396 [INFO ] [testsystem-akka.actor.default-dispatcher-2] akka://testsystem/user/parent/ControllerActor/$a - Message [akka.dispatch.sysmsg.Terminate] from Actor[akka://testsystem/user/parent/ControllerActor/$a#1067345522] to Actor[akka://testsystem/user/parent/ControllerActor/$a#1067345522] was not delivered. [2] dead letters encountered. This logging can be turned off or adjusted with configuration settings 'akka.log-dead-letters' and 'akka.log-dead-letters-during-shutdown'.
2015-01-11 17:41:10,398 [DEBUG] [testsystem-akka.actor.default-dispatcher-2] akka://testsystem/user/parent/ControllerActor - stopped
2015-01-11 17:41:10,399 [DEBUG] [testsystem-akka.actor.default-dispatcher-16] akka://testsystem/user/parent/ControllerActor/$a - stopped
2015-01-11 17:41:10,399 [DEBUG] [testsystem-akka.actor.default-dispatcher-5] akka://testsystem/user/parent - received AutoReceiveMessage Envelope(Terminated(Actor[akka://testsystem/user/parent/ControllerActor#-770422232]),Actor[akka://testsystem/user/parent/ControllerActor#-770422232])
**2015-01-11 17:41:10,400 [DEBUG] [testsystem-akka.actor.default-dispatcher-5] akka.tcp://testsystem@127.0.0.1:2555/user/parent - Msg forwarded to probe Terminated(Actor[akka://testsystem/user/parent/ControllerActor#-770422232])**
...

我真的不明白为什么最后期望的Msg检查在这里不起作用，因为邮件像往常一样被转发。对于自动接收的消息有什么特殊处理吗？

有人请求为此带来一些影响吗？

THX

更新： 试图按照建议解决 - 删除包装器Envelope如下：

class StepParent(child: Props, name: String, probe: ActorRef) extends Actor with ActorLogging {
  context.watch(context.actorOf(props = child, name = name))

  override def receive: Actor.Receive = {
    case msg: PersistImages => context.children.foreach(child => child.tell(msg, sender))
    case mssg: Envelope =>
      log.debug(s"Envelope msg forwarded to probe $mssg")
      probe.tell(mssg.message, sender)
    case msg =>
      log.debug(s"Msg forwarded to probe $msg")
      probe.tell(msg, sender)
  }
}

2015-01-11 23:52:16,352 [DEBUG] [testsystem-akka.actor.default-dispatcher-4] akka://testsystem/user/parent/ControllerActor - stopping
2015-01-11 23:52:16,354 [DEBUG] [testsystem-akka.actor.default-dispatcher-4] akka://testsystem/user/parent/ControllerActor - stopped
2015-01-11 23:52:16,358 [DEBUG] [testsystem-akka.actor.default-dispatcher-16] akka.tcp://testsystem@127.0.0.1:2555/user/parent - Msg forwarded to probe ImagesProcessed(456,Set(file:/))
2015-01-11 23:52:16,358 [DEBUG] [testsystem-akka.actor.default-dispatcher-16] akka://testsystem/user/parent - received AutoReceiveMessage Envelope(Terminated(Actor[akka://testsystem/user/parent/ControllerActor#-1965336139]),Actor[akka://testsystem/user/parent/ControllerActor#-1965336139])
2015-01-11 23:52:16,360 [DEBUG] [testsystem-akka.actor.default-dispatcher-16] akka.tcp://testsystem@127.0.0.1:2555/user/parent - Msg forwarded to probe Terminated(Actor[akka://testsystem/user/parent/ControllerActor#-1965336139])
2015-01-11 23:52:16,365 [DEBUG] [testsystem-akka.actor.default-dispatcher-16] akka://testsystem/system/testActor2 - received AutoReceiveMessage Envelope(Terminated(Actor[akka://testsystem/user/parent/ControllerActor#-1965336139]),Actor[akka://testsystem/user/parent/ControllerActor#-1965336139])

它仍然失败，似乎在这里发生了一些可疑的事情：

2015-01-11 23:52:16,360 [DEBUG] [testsystem-akka.actor.default-dispatcher-16] akka.tcp://testsystem@127.0.0.1:2555/user/parent - Msg forwarded to probe Terminated(Actor[akka://testsystem/user/parent/ImagesControllerActor#-1965336139])

这不是来自StepParent的正确消息，但它以某种方式被提取。

3 个答案:

答案 0 :(得分：0)

StepParent实际上收到了Envelope个Terminated消息。

您可以在日志中看到它：

2015-01-11 17:41:10,399 [DEBUG] [testsystem-akka.actor.default-dispatcher-5] akka://testsystem/user/parent - received AutoReceiveMessage Envelope(Terminated(Actor[akka://testsystem/user/parent/ControllerActor#-770422232]),Actor[akka://testsystem/user/parent/ControllerActor#-770422232])

然而，Envelope消息随后会打印在您的日志中，就像它是Terminated一样，而不是Envelope。

邮件是Terminated，以便包含自动发送邮件中的发件人元数据，即使在这种情况下，override def receive: Actor.Receive = { case msg: PersistImages => context.children.foreach(child => child.tell(msg, sender)) case msg: Envelope => log.debug(s"Envelope msg forwarded to probe $msg") probe.tell(msg.message, sender) case msg => log.debug(s"Msg forwarded to probe $msg") probe.tell(msg, sender) } 邮件已包含发件人信息。

因此，为了让您的考试通过，您可以执行以下操作：

{{1}}

答案 1 :(得分：0)

您的终止声明不正确。目前编码如下：

p.expectMsg(4 seconds, Terminated)

您基本上是在说您期望的消息是Terminated类型本身，而不是Terminated案例类的实例。您应该将断言更改为：

p.expectMsg(4 seconds, Terminated(refToBeTerminated))

或更好：

p.expectTerminated(refToBeTerminated, 4 seconds)

其中refToBeTerminated是您期望终止的ActorRef。我不确定这是否是您唯一的问题，但肯定是一个问题。

修改

当然，如果你关心的是你有任何Terminate，那么你有多种选择来测试它。你可以尝试：

p.expectMsgType[Terminated](4 seconds)

或：

p.expectMsgClass(4 seconds, classOf[Terminated])

甚至：

p.expectMsgPF(4 seconds){case t:Terminated => }

答案 2 :(得分：0)

不幸的是，即使我也确信它们可以正常工作，并且从自动接收日志记录中已经通过了终止消息传递，我通过这种方式工作的唯一方式是通过翻译的Terminated消息到达的一种“丑陋”解决方案。别的东西：

class StepParent(child: Props, name: String, probe: ActorRef) extends Actor with ActorLogging {
  context.watch(context.actorOf(props = child, name = name))

  override def receive: Actor.Receive = {
    case msg: PersistImages => context.children.foreach(child => child.tell(msg, sender))
    case msg: Terminated =>
      log.debug("Parent: Terminated recieved")
      probe.tell("controller terminated",sender)
    case msg =>
      log.debug(s"Msg forwarded to probe $msg")
      probe.tell(msg, sender)
  }
}

断言逻辑工作正常：

p.expectMsg(4 seconds,"controller terminated")

不确定发生了什么，因为似乎终止的msg不能简单地转发，即使它明显被收到了。

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