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:www.slideshare/EvanChan2/akka-inproductionpnw-scala2013
A good example of the stackable traits approach can be seen in this presentation: www.slideshare/EvanChan2/akka-inproductionpnw-scala2013
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如何在akka中发送和接收动作中添加日志记录功能
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