Model View Controller using actors

MVC Actors

class Model extends Actor {
  private state: Int = 0
  private listeners: List[Actor] = Nil
  def act =loop {
    react {
          case AddListener(who) => listeners = who :: listeners
          case RemoveListener(who) => listeners = listeners.remove(who.eq)
          case SetState(st: Int) => state = st; listeners.foreach(_ ! TheState(this, state))
          case GetState => reply(TheState(this, state))
        }
  }
}

case class AddListener(who: Actor)
case class RemoveListener(who: Actor)
case class SetState(st: Int)
case class TheState(model: Actor, state: Int)
case object GetState

class Controller(model: Actor) {
  def incModel = (model !? GetState) match {
    case TheState(_, st) => model ! SetState(st + 1)
  }
}

class View(model: Actor) extends Actor {
  model ! AddListener(this)
  JFrame frame;
  
  def act {
    loop {
      react {
        case TheState(_, st) => frame.setSize(st, st)
      }
    }
  }
}