PostStart.scala

trait PostStart { actor: Actor =>
  def postStart: Unit
  
  override def preStart {
    super.preStart
    actor.become {
      case "PostStart" => try { postStart } finally { actor.unbecome }
    }
    actor.self ! "PostStart"
  }
}

/*Usage: class MyActor extends Actor with PostStart {
  def postStart = {
    ...
  }

  def receive = {
   ... your usual business stuff goes here ...
  }
}*/