为什么我没有收到询问超时异常?

我有两个演员,一个主管和一个儿童演员。

主管:

class DemoActorSupervisor(implicit val system: ActorSystem, config: Config) extends Actor {

  val childActor: ActorRef = context.actorOf(FromConfig.props(Props[DemoActorChild]), "DemoChildActor")

  context.watch(childActor)

  override def receive: Receive = {
    case s: String =>
      childActor forward s
  }
}

儿童演员:

class DemoActorChild extends Actor {
  def receive: Receive = {
    case s: String =>
      Thread.sleep(100)
      Future.successful(true) pipeTo (sender)
  }
}

主要方法:

object ABC extends App {
  implicit val system: ActorSystem = ActorSystem("Demo")

  implicit val config: Config = ConfigFactory.load()

  implicit val timeout: Timeout = Timeout(5, TimeUnit.MILLISECONDS)

  val supervisor = system.actorOf(DemoActorSupervisor.props(), "DemoSupervisor")

  val x: Future[Boolean] = (supervisor ? ("ASK")).mapTo[Boolean]
  x.foreach(println)
}

我将ask超时设置为5毫秒,并对主管演员执行ask调用。正在将消息转发给子参与者。在我放的儿童演员里 Thread.sleep(100) 从逻辑上讲,我应该得到ask timeout异常,因为我将timeout设置为5 mili秒,而child的响应时间超过100 mili秒,但我没有得到ask timeout异常。 有人能告诉我密码有什么问题吗?如何获得ask超时异常。