Package scala.concurrent

Examples of scala.concurrent.ExecutionContext

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   * @param self the self actor reference
   * @return the future sequence
   */
  public Future<Iterable<Object>> deactivateNodes(Iterable<ActorRef> actorReferences, String processInstanceId, Timeout deactivationTimeout, ActorRef sender, ActorRef self) {
   
    final ExecutionContext ec = actorSystem.dispatcher();
   
    Future<Iterable<Object>> futureSequence = sendDeactivationMessageToActors(
        actorReferences, processInstanceId, deactivationTimeout);
        // block until all futures came back
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   * @return the future
   */
  private Future<Iterable<Object>> sendDeactivationMessageToActors(
      Iterable<ActorRef> actorReferences, String processInstanceId,
      Timeout deactivationTimeout) {
    final ExecutionContext ec = actorSystem.dispatcher();

    List<Future<Object>> listOfFutureActorRefs = new ArrayList<Future<Object>>();
   
    for (ActorRef actor : actorReferences) {
      try {
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    final ActorRef frontend = system.actorOf(
        Props.create(TransformationFrontend.class), "frontend");
    final FiniteDuration interval = Duration.create(2, TimeUnit.SECONDS);
    final Timeout timeout = new Timeout(Duration.create(5, TimeUnit.SECONDS));
    final ExecutionContext ec = system.dispatcher();
    final AtomicInteger counter = new AtomicInteger();
    system.scheduler().schedule(interval, interval, new Runnable() {
      public void run() {
        ask(frontend,
            new TransformationJob("hello-" + counter.incrementAndGet()),
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  @SuppressWarnings("unused")
  public void compileLookup() {
    //#lookup
    // this is scala.concurrent.ExecutionContext
    // for use with Futures, Scheduler, etc.
    final ExecutionContext ex = system.dispatchers().lookup("my-dispatcher");
    //#lookup
  }
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    //#print-result
  }
  @SuppressWarnings("unchecked") @Test public void useCustomExecutionContext() throws Exception {
    ExecutorService yourExecutorServiceGoesHere = Executors.newSingleThreadExecutor();
    //#diy-execution-context
    ExecutionContext ec =
      ExecutionContexts.fromExecutorService(yourExecutorServiceGoesHere);

    //Use ec with your Futures
    Future<String> f1 = Futures.successful("foo");
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  }

  @Test
  public void useMap() throws Exception {
    //#map
    final ExecutionContext ec = system.dispatcher();

    Future<String> f1 = future(new Callable<String>() {
      public String call() {
        return "Hello" + "World";
      }
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  }

  @Test
  public void useMap2() throws Exception {
    //#map2
    final ExecutionContext ec = system.dispatcher();

    Future<String> f1 = future(new Callable<String>() {
      public String call() throws Exception {
        Thread.sleep(100);
        return "Hello" + "World";
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  }

  @Test
  public void useMap3() throws Exception {
    //#map3
    final ExecutionContext ec = system.dispatcher();

    Future<String> f1 = future(new Callable<String>() {
      public String call() {
        return "Hello" + "World";
      }
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  }

  @Test
  public void useFlatMap() throws Exception {
    //#flat-map
    final ExecutionContext ec = system.dispatcher();

    Future<String> f1 = future(new Callable<String>() {
      public String call() {
        return "Hello" + "World";
      }
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    List<Future<Integer>> source = new ArrayList<Future<Integer>>();
    source.add(Futures.successful(1));
    source.add(Futures.successful(2));

    //#sequence
    final ExecutionContext ec = system.dispatcher();
    //Some source generating a sequence of Future<Integer>:s
    Iterable<Future<Integer>> listOfFutureInts = source;

    // now we have a Future[Iterable[Integer]]
    Future<Iterable<Integer>> futureListOfInts = sequence(listOfFutureInts, ec);
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