如何编辑Akka application.conf

Question

I am searching for days for a tutorial on how to write a custom application.conf. I read the akka-documentation and tried the Pi example.

But now I want to run my own configuration. My goal is to override the router type and change the number of routees. Here is my code:

package org.sddb.playground

import akka.actor._
import com.typesafe.config.ConfigFactory
import akka.routing.RoundRobinRouter

object Test extends App {

  case object Log
  case object Ask

  class Tester extends Actor with ActorLogging {

    def receive = {
      case Log => logging
      case Ask => answer
    }

    def logging {
      log error "error"
      log warning "warning"
      log debug "debug"
    }

    def answer {
      log info "somebody asked"
    }
  }
  val config = ConfigFactory.load
  val system = ActorSystem("TestSystem", config.getConfig("test"))
  val tester = system.actorOf(Props[Tester].withRouter(RoundRobinRouter(2)))
  tester ! Log
  tester ! Ask
  tester ! PoisonPill
  system.shutdown
}

My application.config looks that way:

test {
  akka.loglevel = DEBUG
  deployment {
    /tester {
      router = broadcast
      nr-of-instances = 5
    }
  }
}

The loging on debug level is ok but there is neither a broadcast nor are there 5 instances. Where is my misstake?

Answer 1

That is because you are creating a RoundRobinRouter(2) explicitly. You have to pass FromConfig() instead and also you have to pass "tester" as name.

edit:

Your config section is wrong, it should be:

test {
  akka.loglevel = DEBUG
  akka.actor.deployment {
    /tester {
      router = broadcast
      nr-of-instances = 5
    }
  }
}

But you could also just do

akka {
  loglevel = DEBUG
  actor {
    deployment {
      /tester {
        router = broadcast
        nr-of-instances = 5
      }
    }
  }
}

then you don't have to pass in the config manually.