Simulation of Star network topology using Actors in Scala

StarTopologySimulation.scala

import actors.Actor
import actors.Actor._

object StarTopologySimulation extends Application {

  case class Message(sender: Node)
  
  class Node(id: Int) extends Actor {
    def act() {
      val startTime = System.nanoTime
      loop {
        react {
          case msg: Message => CentralNode ! Message(this)
        }
      }
    }
  }
  
  object CentralNode extends Node(0) {
    override def act() {
      val startTime = System.nanoTime
      var msgCount = 0
      loop {
        react {
          case Message(sender) => {
            msgCount += 1
            if (msgCount % 1000 == 0) {
                println("%.0f messages/sec" format 
                  (msgCount * 1e9/(System.nanoTime - startTime)))
            }
            sender ! Message(CentralNode)
          }
        }
      }
    }
  }

  print("Number of nodes? ")
  val noOfNodes = readInt
  
  val nodes = for { i <- 1 to noOfNodes } yield new Node(i)    
  
  CentralNode start
  
  nodes foreach { _.start }
  nodes foreach { _ ! Message(CentralNode) }

}