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/**
* Copyright (C) 2009-2016 Lightbend Inc.
*/
package akka
import akka.actor.ActorSystem
import akka.actor.ExtendedActorSystem
import akka.actor.Actor
import akka.actor.Terminated
import akka.actor.ActorLogging
import akka.actor.Props
import akka.actor.ActorRef
import scala.util.control.NonFatal
/**
* Main class to start an [[akka.actor.ActorSystem]] with one
* top level application supervisor actor. It will shutdown
* the actor system when the top level actor is terminated.
*/
object Main {
/**
* @param args one argument: the class of the application supervisor actor
*/
def main(args: Array[String]): Unit = {
if (args.length != 1) {
println("you need to provide exactly one argument: the class of the application supervisor actor")
} else {
val system = ActorSystem("Main")
try {
val appClass = system.asInstanceOf[ExtendedActorSystem].dynamicAccess.getClassFor[Actor](args(0)).get
val app = system.actorOf(Props(appClass), "app")
val terminator = system.actorOf(Props(classOf[Terminator], app), "app-terminator")
} catch {
case NonFatal(e) ⇒ system.terminate(); throw e
}
}
}
class Terminator(app: ActorRef) extends Actor with ActorLogging {
context watch app
def receive = {
case Terminated(_) ⇒
log.info("application supervisor has terminated, shutting down")
context.system.terminate()
}
}
}