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Scala example source code file (ConcurrentTest.scala)

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

Learn more about this Scala project at its project page.

Java - Scala tags/keywords

concurrenttest, countdownlatch, failed, long, prop, should, speclite, string, threading, threads, unit, withtimeout

The ConcurrentTest.scala Scala example source code

package scalaz
package concurrent

import java.util.concurrent._
import org.scalacheck.Prop

object ConcurrentTest extends SpecLite{

  "Current test tools" should {
    "succeed on exhaused CountDownLatch" in {
      val latch = new CountDownLatch(1)
      assertCountDown(latch, "Should always be processed immediately")

    "run forked code" in {
      val latch = new CountDownLatch(1)
      fork {
      assertCountDown(latch, "Should be processed asynchronously")

    "run test with timeout" in {
      (withTimeout(2000) {

    "fail when timeout occurs" in {
      (withTimeout(100) {

  def assertCountDown(latch: CountDownLatch, hint: String, timeout: Long = 1000) : Prop = {
    if (latch.await(timeout, TimeUnit.MILLISECONDS)) ()
    else sys.error("Failed to count down within " + timeout + " millis: " + hint)

  def fork(f: => Unit) {
    new Thread {
      override def run() {

  final class WithTimeout(timeout: Long) {
    def apply[A](test: => A): A = {
      val latch = new CountDownLatch(1)
      @volatile var result: A = null.asInstanceOf[A]
      fork {
        result = test
      if (latch.await(timeout, TimeUnit.MILLISECONDS)) result
      else sys.error("Timeout occured, possible deadlock.")

  def withTimeout(timeout: Long) = new WithTimeout(timeout)

Other Scala examples (source code examples)

Here is a short list of links related to this Scala ConcurrentTest.scala source code file:

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