import scala.actors._
import Actor._

case class Get()
case class Put()

class Besteck(left: Gabel, right: Gabel) extends Actor {
   start
   
   def act = loop {
      react {
         case Get if (left.available && right.available) => 
            left.available  = false
            right.available = false
            reply()
         case Put =>
            left.available = true
            right.available = true
      }
   }
}

class Gabel {
   var available = true
}

class Philosoph (val id: String, val besteck: Besteck) extends Actor {
   start
   
   def act = loop {
      essen
      denken
   }
   
   private def essen {
      println(id+" versucht, beide Gabel zu nehmen ...")
      besteck !? Get
      println(id+" isst ...")
      Thread.sleep((1000*java.lang.Math.random()) toLong)
      besteck ! Put
   }
   
   private def denken {
      println(id+" denkt ...")
      Thread.sleep((1000*java.lang.Math.random()) toLong)
      println(" ... " + id + " hat zuende gedacht!")
   }
}

object Philosophen extends Application {
   val gabeln = for {i <- 1 to 5} yield new Gabel
   val namen = List(
      "Sokrates", "Descartes", "Kant", "Nietzsche", "Russell"
   )
   for {p <- namen zipWithIndex}
      new Philosoph(p._1, new Besteck(gabeln(p._2), gabeln((p._2 + 1) % gabeln.size)))
}