Akka actor没有正确加载自定义邮箱配置

Question

我试图为Play 2.5中的演员定义一个自定义邮箱，保证邮件的唯一性和优先级。

我得到了这个例外：

CreationException: Unable to create injector, see the following errors:

1) Error in custom provider, akka.ConfigurationException: Type [jobs.SteamInfoUpdater.MyPrioQueueSematics] specified as akka.actor.mailbox.requirement [unique-prio-mailbox] in config can't be loaded due to [jobs.SteamInfoUpdater.MyPrioQueueSematics]
  while locating play.api.libs.concurrent.ActorSystemProvider
  while locating akka.actor.ActorSystem
    for field at play.api.libs.concurrent.ActorRefProvider.actorSystem(Akka.scala:205)
  while locating play.api.libs.concurrent.ActorRefProvider
  at com.google.inject.util.Providers$GuicifiedProviderWithDependencies.initialize(Providers.java:149)
  at play.api.libs.concurrent.AkkaGuiceSupport$class.bindActor(Akka.scala:139) (via modules: com.google.inject.util.Modules$OverrideModule -> modules.ServiceModule)

我的配置中有以下内容：

unique-prio-mailbox{
  mailbox-type = "jobs.SteamInfoUpdater.UniquePriorityMailbox"
}
akka.actor.mailbox.requirements {
  "jobs.SteamInfoUpdater.MyPrioQueueSematics" = unique-prio-mailbox
}

我认为问题与配置无法加载MyPriorityQueueSemantics有关，因为如果我将配置更改为：

akka.actor.mailbox.requirements {
      "test" = unique-prio-mailbox
    }

我明白了：

Error in custom provider, akka.ConfigurationException: Type [test] specified as akka.actor.mailbox.requirement [unique-prio-mailbox] in config can't be loaded due to [test]

这是我的邮箱实现：

trait MyPrioQueueSematics

  class UniquePriorityMessageQueue extends MessageQueue
    with MyPrioQueueSematics {

    private final val queue = new UniquePriorityBlockingQueue[Envelope](500, Ordering.by(e => e.message match {
      case m: InfoUpdaterMessage => m.priority
      case _ => Int.MaxValue
    }))

    def enqueue(receiver: ActorRef, handle: Envelope): Unit =
      queue.offer(handle)

    def dequeue(): Envelope = queue.poll()

    def numberOfMessages: Int = queue.size

    def hasMessages: Boolean = !queue.isEmpty

    def cleanUp(owner: ActorRef, deadLetters: MessageQueue) {
      while (hasMessages) {
        deadLetters.enqueue(owner, dequeue())
      }
    }
  }

class UniquePriorityBlockingQueue[T](initialCapacity: Int, ordering: Ordering[T]) extends ForwardingQueue[T] {
    override def delegate(): util.Queue[T] = new PriorityBlockingQueue[T](initialCapacity, ordering)

    override def add(element: T): Boolean = if (super.contains(element)) {
      false
    } else {
      super.add(element)
    }

    override def offer(o: T): Boolean = standardOffer(o)
  }

  class UniquePriorityMailbox extends MailboxType with ProducesMessageQueue[UniquePriorityMessageQueue] {

    def this(settings: ActorSystem.Settings, config: Config) = {
      this()
    }

    final override def create(
      owner: Option[ActorRef],
      system: Option[ActorSystem]): MessageQueue =
      new UniquePriorityMessageQueue()
  }

我已遵循本指南：http://doc.akka.io/docs/akka/snapshot/scala/mailboxes.html