slightly modified ReplyingActor (inspiration: http://www.warski.org/blog/2013/05/typed-ask-for-akka/)

gistfile1.scala

trait ReplyingActor extends Actor {
  final def receive = {
    case m: Replyable[_] if receiveReplyable.isDefinedAt(m) => {
      try {
        sender ! receiveReplyable(m)
      } catch {
        case e: Exception => sender ! Failure(e)
      }
    }
    case x => receiveOther(x)
  }
 
  def receiveReplyable[T]: PartialFunction[Replyable[T], T]
  def receiveOther: PartialFunction[Any, Unit]
}