Applying Akka's recommended practices for actor creation (See http://doc.akka.io/docs/akka/snapshot/scala/actors.html#Recommended_Practices) to the Cake pattern example taken from answer to this question on StackOverflow (See http://stackoverflow.com/questions/15996098/akka-and-cake-pattern). I have added the props method to the `ServiceActor` o…

AkkaCake.scala

trait DBComponent {
  def db: DB

  type K
  type V

  trait DB {
    def put(key: K, value: V): Unit
    def get(key: K): Option[V]
  }
}

trait ServiceComponent {
  thisComponent: DBComponent =>

  object ServiceActor {
    case class Put(key: K, value: V)
    case class Get(key: K)

    def props: Props = Props(classOf(ServiceActor), thisComponent)
  }

  class ServiceActor {
    import ServiceActor._
    def receive = {
      case Put(k, v) => db.put(k, v) // db is in scope
      case Get(k) => sender ! db.get(k)
    }    
  }
}
   
object AkkaCakeApp extends App with ServiceComponent with DBComponentImpl {
  val system = ActorSystem("helloakka")

  val serviceActor = system.actorOf(ServiceActor.props)

  serviceActor ! ServiceActor.Put(key, value)
}