Question

我正在学习使用Scala的Actors。我发现了圣诞老人问题的这一伟大实施here。但是，这是使用Scala Actors而不是Akka Actors。有一个特殊的部分，我不明白如何处理Akka演员，从第80行开始：

/*(line 80)*/object Secretary extends Actor{

  def act = loop(Group[Elf](3), Group[Reindeer](9))

  private def addToGroup[T <% Helper](helper: T, group: Group[T]) = {
    val updatedGroup = group.copy(helpers = helper :: group.helpers)
    if(updatedGroup.hasSpace) updatedGroup else {
      Santa ! updatedGroup
      group.copy(helpers = List[T]())
    }
  }

  // How to implement this using 'receive' with akka
  private def loop(elves: Group[Elf], reindeers: Group[Reindeer]):Unit = {
    react {
      case Idle(reindeer: Reindeer) => loop(elves, addToGroup(reindeer, reindeers))
      case Idle(elf: Elf) => loop(addToGroup(elf, elves), reindeers)
    }
  }

}

我正在使用此guide将其迁移到Akka Actors，我知道act方法应该用receive替换。但是我不明白如何使用receive执行相同的循环。解释或示例代码会有所帮助

Answer 1

您可以像这样使用context.become：

def receive = loop(Group[Elf](3), Group[Reindeer](9))

private def loop(elves: Group[Elf], reindeers: Group[Reindeer]): Receive = {
  case Idle(reindeer: Reindeer) => context become loop(elves, addToGroup(reindeer, reindeers))
  case Idle(elf: Elf) => context become loop(addToGroup(elf, elves), reindeers)
}

斯卡拉演员与阿卡演员

1 个答案: