Scala example source code file (t2515.scala)

This example Scala source code file (t2515.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

iteration, iteration, none, none, option, some, some, test, timeout, unit, unit

The Scala t2515.scala source code

import scala.actors.{Futures, TIMEOUT}
import scala.actors.Actor._

object Test {

  def compute(): Option[Boolean] = {
    val fts = for (j <- 0 until 5) yield Futures.future {
      receiveWithin (100) {
        case TIMEOUT => true
        case other   => false
      }
    }
    val done = Futures.awaitAll(2000, fts.toArray: _*) // list to array, as varargs
    if (done.contains(None))
      None
    else
      Some(true)
  }

  def main(args:Array[String]) : Unit = {
    val ft = Futures.future {
      val format = new java.text.DecimalFormat("000.00'ms'")
      var iter = 1
      val done = 11
      while (iter < done) {
        val start = System.nanoTime()
        val result = compute()
        val time = System.nanoTime() - start
        result match {
          case Some(result) =>
            //printf("Iteration %2d succeeded after %s %n", iter, format.format(time / 1e6))
            printf("Iteration %2d succeeded%n", iter)
            iter += 1
          case None =>
            printf(">>>> Iteration %2d failed after %s <<<<< %n", iter, format.format(time / 1e6))
            iter = done
        }
      }
    }
    ft()
  }

}