askParam = (AskParam) message;
caller = getSender();
targetActor = getContext().actorOf(askParam.props);
getContext().watch(targetActor);
targetActor.forward(askParam.message, getContext());
Scheduler scheduler = getContext().system().scheduler();
timeoutMessage = scheduler.scheduleOnce(askParam.timeout.duration(),
self(), new AskTimeout(), context().dispatcher(), null);
} else if (message instanceof Terminated) {
Throwable ex = new ActorKilledException("Target actor terminated.");
caller.tell(new Status.Failure(ex), self());
timeoutMessage.cancel();