如何在akka的发送和接收动作中添加日志功能

问题描述

现在，我被要求在 akka 的 actor 中添加日志记录功能.

Now, I am asked to add logging function in akka's actor.

收到消息后，在处理之前，应将此消息写入日志.并且在发送一条消息之前，应该先记录这条消息.

When a message is received, before it is handled, this message should be written into log.And before a message is sent out, this message should be logged first.

我认为我应该覆盖 Actor 中的 receive 和 send 函数.假设我创建了一个扩展 Actor 的特征 actorlog.而 myActor 类扩展了 actorlog.但是在 myActor 中，我需要覆盖 receive 函数(这似乎会导致问题).所以我很困惑我应该做什么.

I think I should override the receive and send functions in Actor. Suppose I create a trait actorlog which extends Actor. And class myActor extends actorlog. But in myActor, I need to override receive function (it seems it causes problems here). So I am confused what I should do.

附注.我知道 akka 提供日志记录.但是现在我需要自己实现这个功能.

PS. I know akka provides logging. But now I need implement this function by myself.

推荐答案

除了这里的其他答案，另一种方法是使用 orElse 将部分函数添加到您的 receive.在该部分函数中，将日志记录放在 isDefinedAt 中，以便在每条消息上调用它.

Besides the other answers here, another approach is to use orElse to prepend a partial function to your receive. In that partial function, put the logging in isDefinedAt so it gets called on every message.

例如:

trait ReceiveLogger {
  this: Actor with ActorLogging =>

  def logMessage: Receive = new Receive {
    def isDefinedAt(x: Any) = {
      log.debug(s"Got a $x")
      false
    }
    def apply(x: Any) = throw new UnsupportedOperationException  
  }
}  

class MyActor extends Actor with ActorLogging with ReceiveLogger {
  def receive: Receive = logMessage orElse {
     case ...
  }
}

使用orElse 是组成receive 行为的通用方法.在大多数情况下，我正在编写这样的东西:

Using orElse is a general approach for composing receive behavior. In most cases I am composing things like this:

def otherBehavior: Receive = {
  case OtherMessage => ...
}

class MyActor extends Actor {
  def receive = otherBehavior orElse {
    case ...
  }
} 

在此演示文稿中可以看到可堆叠特征方法的一个很好的例子:http://www.slideshare.net/EvanChan2/akka-inproductionpnw-scala2013

A good example of the stackable traits approach can be seen in this presentation: http://www.slideshare.net/EvanChan2/akka-inproductionpnw-scala2013

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