Scala example source code file (message.scala)

This example Scala source code file (message.scala) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Scala tags/keywords

actor, actor, array, array, int, int, singlethreadedscheduler, usage, usage

The Scala message.scala source code

package examples.actors

import scala.actors.{Actor, Scheduler}
import scala.actors.Actor._
import scala.actors.scheduler.SingleThreadedScheduler

object message {
  def main(args: Array[String]) {
    val n = try { args(0).toInt }
    catch {
      case _ =>
        println("Usage: examples.actors.message <n>")
        Predef.exit
    }
    val nActors = 500
    val finalSum = n * nActors
    Scheduler.impl = new SingleThreadedScheduler

    def beh(next: Actor, sum: Int) {
      react {
        case value: Int =>
          val j = value + 1; val nsum = sum + j
          if (next == null && nsum >= n * j)
            println(nsum)
          else {
            if (next != null) next ! j
            if (nsum < n * j) beh(next, nsum)
          }
      }
    }

    def actorChain(i: Int, a: Actor): Actor =
      if (i > 0) actorChain(i-1, actor(beh(a, 0))) else a

    val firstActor = actorChain(nActors, null)
    var i = n; while (i > 0) { firstActor ! 0; i -= 1 }

    Scheduler.shutdown()
  }
}