如何在akka中发送和接收动作中添加日志记录功能 [英] how to add logging function in sending and receiving action in akka

问题描述

现在，我被要求在akka的演员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，应先将其写入日志，然后再进行处理。
并且在发送消息之前，应先记录此消息。

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.

我想我应该覆盖接收和 send 函数。假设我创建了一个特征 actorlog ，它扩展了 Actor 。类 myActor 扩展了 actorlog 。但是在 myActor 中，我需要重写 receive 函数（这似乎在这里引起问题）。所以我很困惑该怎么办。

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.

PS。我知道akka提供日志记录。但是，现在我需要自己实现此功能。

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 为您的接收附加部分函数。在该部分函数中，将日志记录放入 isDefinedAt 中，以便在每条消息上都调用它。

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 是构成接收行为的通用方法。在大多数情况下，我会编写如下内容：

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 ...
  }
} 

在本演示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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