object AskPattern
The ask-pattern implements the initiator side of a request–reply protocol.
The party that asks may be within or without an Actor, since the
implementation will fabricate a (hidden) ActorRef that is bound to a
scala.concurrent.Promise. This ActorRef will need to be injected in the
message that is sent to the target Actor in order to function as a reply-to
address, therefore the argument to the ask / ?
operator is not the message itself but a function that given the reply-to
address will create the message.
case class Request(msg: String, replyTo: ActorRef[Reply]) case class Reply(msg: String) implicit val timeout = Timeout(3.seconds) val target: ActorRef[Request] = ... val f: Future[Reply] = target ? (Request("hello", _))
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- Ask.scala
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