Question

我正在设计一个消耗来自无穷无尽的流中的项目的actor，并且需要一种方法来控制它何时开始和停止使用消息。是否有与演员一起实现这样的可中断循环的通用模式？我在考虑让我的演员向自己发送消息。像（伪Scala）：

class Interruptible extends Actor {
  val stream: Stream
  val running: boolean

  def receive = {
    case "start" => {
      running = true
      consumeItem
    }

    case "stop" => {
      running = false
    }

    case "consumeNext" => consumeItem
  }

  def consumeItem {
    if (running) {
      stream.getItem
      this ! "consumeNext"
    }
  }
}

这是最好的办法吗？

谢谢！

Answer 1

也许编码如下：

class Interruptible extends Actor {
  val stream: Stream

  def inactive: Receive = { // This is the behavior when inactive
    case "start" =>
      self become active
  }

  def active: Receive = { // This is the behavior when it's active
    case "stop" =>
      self become inactive
    case "next" =>
      doSomethingWith(stream.getItem)
      self ! "next"
  }

  def receive = inactive // Start out as inactive
}

干杯，

使用actor的可中断循环的模式

1 个答案: