Trying to configure ActorSystems

[Ian Nowland]

Hello,

I'm trying to configure an ActorSystem, but no matter what I do, seem to be getting the default dispatcher. Here's what I've got going on:

val customConf = ConfigFactory.parseString(

  """

    |akka {

    |

    |  actor{

    |

    |    /function-scheduler {

    |      dispatcher = function-scheduler-dispatcher

    |    }

    |

    |    function-scheduler-dispatcher {

    |      type = Dispatcher

    |      executor = "fork-join-executor"

    |      fork-join-executor {

    |        # Min number of threads

    |        parallelism-min = 2

    |        # available processors * factor

    |        parallelism-factor = 4.0

    |        # Max number of threads

    |        parallelism-max = 32

    |      }

    |    }

    |  }

    |

    |}

  """.stripMargin)

val system:ActorSystem = ActorSystem("function-scheduler",ConfigFactory.load(customConf))

import system.dispatcher

def scheduleOnce(delayTime: Long)(f:() => Unit):Unit = {

  import scala.language.postfixOps

  system.scheduler.scheduleOnce(delayTime milliseconds) {

    f()

  }

}

As you can see, what I'm trying to do is use a scheduler to be able to schedule arbitrary tasks. The problem is that everything I've tried in that customConf still results in system using the akka.actor.default-dispatcher. I definitely don't understand how the configuration stuff works, but my theory is that I'm configuring the dispatcher that would be used for created ActorRefs if I was to call something like:

val myActor = system.actorOf(Props[MyActor].withDispatcher("function-scheduler-dispatcher"), "myactor1")

rather than configuring the system itself.

[Patrik Nordwall]

Remove the import system.dispatcher and you will see that you need to provide an ExecutionContext, which you can lookup from the config, via the system.dispatchers.lookup (I think)

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[Ian Nowland]

So, I've tried replacing the

import system.dispatcher

with

implicit val executionContext = system.dispatchers.lookup("akka.actor.habari-function-scheduler-dispatcher")

but I'm still getting the system.dispatcher as the akka.default

[Johan Andrén]

I think the namespaces in your config are incorrect, deployment config for an actor should 

be under "akka.actor.deployment" (described in the docs here: 

http://doc.akka.io/docs/akka/2.4.1/general/configuration.html#Actor_Deployment_Configuration)

and the dispatcher you refer to from your actor is actually under akka.actor.function-scheduler-dispatcher

in your sample but you then refer to it only by the last name in the path "function-scheduler-dispatcher". 

I think what you intend would be:

akka.actor.deployment {

  /function-scheduler {

    dispatcher = function-scheduler-dispatcher

  }

}

 

function-scheduler-dispatcher {

   ... dispatcher config ...

}

I hope this helps

--

Johan Andrén
Typesafe -  Reactive apps on the JVM
Twitter: @apnylle

[Ian Nowland]

Thanks, that helps.

--

>>>>>>>>>> Read the docs: http://akka.io/docs/
>>>>>>>>>> Check the FAQ: http://doc.akka.io/docs/akka/current/additional/faq.html
>>>>>>>>>> Search the archives: https://groups.google.com/group/akka-user
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