Created
May 21, 2012 19:07
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Mailinglist question about watching routees for termination
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package question | |
import java.io.IOException | |
import scala.util.Random | |
import akka.actor.Actor | |
import akka.actor.ActorRef | |
import akka.actor.ActorSystem | |
import akka.actor.OneForOneStrategy | |
import akka.actor.Props | |
import akka.actor.SupervisorStrategy.Restart | |
import akka.actor.Terminated | |
import akka.dispatch.Await | |
import akka.pattern.ask | |
import akka.routing.CurrentRoutees | |
import akka.routing.RoundRobinRouter | |
import akka.routing.RouterRoutees | |
import akka.util.Timeout | |
import akka.util.duration._ | |
object RouterApp extends App { | |
val system = ActorSystem() | |
val master = system.actorOf(Props[Master], "master") | |
implicit val timeout = Timeout(10 seconds) | |
try | |
println(Await.result(master ? "start", timeout.duration)) | |
catch { | |
case e ⇒ println(e.getMessage) | |
} finally { | |
system.shutdown() | |
} | |
} | |
class Master extends Actor { | |
var results = Map[Int, Int]() | |
var replyTo: ActorRef = _ | |
val router = context.actorOf(Props(new Worker). | |
withRouter(RoundRobinRouter(5, | |
supervisorStrategy = OneForOneStrategy( | |
maxNrOfRetries = 2) { | |
case _: IOException ⇒ Restart | |
})), name = "router") | |
router ! CurrentRoutees | |
def receive = { | |
case RouterRoutees(routees) ⇒ | |
routees foreach context.watch | |
case "start" ⇒ | |
replyTo = sender | |
for (id ← 1 to 10) router ! (id, "22") | |
case (id: Int, result: Int) ⇒ | |
results += (id -> result) | |
if (results.size == 10) | |
replyTo ! results.values.sum | |
case Terminated(actor) ⇒ | |
replyTo ! -1 | |
context.stop(self) | |
} | |
} | |
class Worker extends Actor { | |
def receive = { | |
case (id, s: String) if Random.nextInt(4) == 0 ⇒ | |
throw new IOException("failed") | |
case (id, s: String) ⇒ | |
sender ! (id, s.toInt) | |
} | |
override def preRestart( | |
reason: Throwable, message: Option[Any]) { | |
// retry | |
message foreach { self forward _ } | |
} | |
} |
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