【发布时间】：2012-12-29 04:18:52
【问题描述】：
我正在尝试使用 akka Actor 使用 ask 模式发出最简单的异步请求，但无论如何我都会收到 akka.pattern.AskTimeoutException。我有的是这样的：
object Users extends Controller {
def newUser = {
val actor = Akka.system.actorOf(Props[UserRegistration])
ActorAction[String](actor, "hello")(Ok(_))
}
}
ActorAction 是通常的Async 的包装器：
object ActorAction {
def apply[A](actorRef: ActorRef, msg: AnyRef, timeout: Timeout = 5 seconds)(f: A => Result)(implicit m: Manifest[A]): Action[AnyContent] = {
Action {
AsyncResult {
ask(actorRef, msg, timeout).mapTo[A].asPromise.map(f)
}
}
}
}
演员什么都不做，只是记录接收消息并返回它：
class UserRegistration extends Actor {
val log = Logging(context.system, this)
def receive = {
case u => log.info("received " + u); u
}
}
消息的记录工作得很好。我已经尝试了一切，但没有任何效果。任何帮助都非常受欢迎！
播放：2.9.1 阿卡：2.0.2
堆栈跟踪：
[info] play - database [default] connected at jdbc:postgresql://localhost:5432/ss_dev
[info] play - Application started (Dev)
[info] play - Starting application default Akka system.
[INFO] [12/28/2012 22:10:42.51] [application-akka.actor.default-dispatcher-1] [akka://application/user/$a] received hello
[error] play - Waiting for a promise, but got an error: Timed out
akka.pattern.AskTimeoutException: Timed out
at akka.dispatch.DefaultPromise.result(Future.scala:875) [akka-actor.jar:2.0.2]
at akka.dispatch.Await$.result(Future.scala:74) ~[akka-actor.jar:2.0.2]
at play.api.libs.concurrent.AkkaPromise.await(Akka.scala:43) ~[play_2.9.1.jar:2.0.4]
at play.api.libs.concurrent.Promise$class.await(Promise.scala:55) ~[play_2.9.1.jar:2.0.4]
at play.api.libs.concurrent.AkkaPromise.await(Akka.scala:28) ~[play_2.9.1.jar:2.0.4]
at play.api.libs.concurrent.Promise$class.value(Promise.scala:53) ~[play_2.9.1.jar:2.0.4]
Caused by: akka.pattern.AskTimeoutException: Timed out
at akka.pattern.PromiseActorRef$$anonfun$1.apply$mcV$sp(AskSupport.scala:274) ~[akka-actor.jar:2.0.2]
at akka.actor.DefaultScheduler$$anon$6$$anon$7.run(Scheduler.scala:183) ~[akka-actor.jar:2.0.2]
at akka.dispatch.TaskInvocation.run(AbstractDispatcher.scala:94) [akka-actor.jar:2.0.2]
at akka.jsr166y.ForkJoinTask$AdaptedRunnableAction.exec(ForkJoinTask.java:1381) [akka-actor.jar:2.0.2]
at akka.jsr166y.ForkJoinTask.doExec(ForkJoinTask.java:259) [akka-actor.jar:2.0.2]
at akka.jsr166y.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:975) [akka-actor.jar:2.0.2]
提前致谢！
【问题讨论】：
标签： scala playframework-2.0 akka