toplevel.scala

package demo

class TopLevel extends Actor {
  val db = context.actorOf(Props[Database])
  context.watch(db)
  
  val web = context.actorOf(Props[WebServer])
  web ! Start(database = db)
  
  override val supervisorStrategy = OneForOneStrategy() {
    case _ if sender == db  => Stop
    case _ if sender == web => Restart
  }

  def receive = {
    case Terminated(`db`) => context stop self
  }
}