Akka Logging outside Actor

Question

I have an Akka Actor that makes a call to MyObject.foo(). MyObject is not an Actor. How do I setup Logging in it? With an Actor it's simple, because I can just mixin ActorLogging. In MyObject, I don't have access to context.system. Do I create an akka.event.Logging with AkkaSystem() and then what for the LogSource implicit?

Answer 1

Actually I would redirect Akka logging to slf4j and use this API directly in all unrelated classes. First add this to your configuration:

akka {     event-handlers = ["akka.event.slf4j.Slf4jEventHandler"]     loglevel = "DEBUG" } 

Then choose some SLF4J implementation, I suggest logback. In your actors continue using ActorLogging trait. In other classes simply rely on SLF4J API - or even better - try out slf4s facade around SLF4J.

Tip: try out the following logging pattern in Logback:

<pattern>%d{HH:mm:ss.SSS} | %-5level | %thread | %X{akkaSource} | %logger{1} | %m%n%rEx</pattern> 

The %X{akkaSource} will print actor path when available (just like standard logging).

Answer 2

Using Akka 2.2.1, I was able to put this into my App to get logging outside of an actor:

import akka.event.Logging val system = ActorSystem("HelloSystem", ConfigFactory.load.getConfig("akka")) val log = Logging.getLogger(system, this) log.info("Hi!") 

This seems like a simpler solution for unifying an application's logging.