Examples of scala.concurrent.ExecutionContext

scala.concurrent.ExecutionContext

  }


  @Test
  public void useTraverse() throws Exception {
    //#traverse
    final ExecutionContext ec = system.dispatcher();
    //Just a sequence of Strings
    Iterable<String> listStrings = Arrays.asList("a", "b", "c");


    Future<Iterable<String>> futureResult = traverse(listStrings,
      new Function<String, Future<String>>() {

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    List<Future<String>> source = new ArrayList<Future<String>>();
    source.add(Futures.successful("a"));
    source.add(Futures.successful("b"));
    //#fold


    final ExecutionContext ec = system.dispatcher();


    //A sequence of Futures, in this case Strings
    Iterable<Future<String>> futures = source;


    //Start value is the empty string

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    List<Future<String>> source = new ArrayList<Future<String>>();
    source.add(Futures.successful("a"));
    source.add(Futures.successful("b"));
    //#reduce


    final ExecutionContext ec = system.dispatcher();
    //A sequence of Futures, in this case Strings
    Iterable<Future<String>> futures = source;


    Future<Object> resultFuture = reduce(futures,
      new Function2<Object, String, Object>() {

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    assertEquals("ab", result);
  }


  @Test
  public void useSuccessfulAndFailedAndPromise() throws Exception {
    final ExecutionContext ec = system.dispatcher();
    //#successful
    Future<String> future = Futures.successful("Yay!");
    //#successful
    //#failed
    Future<String> otherFuture = Futures.failed(

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  }


  @Test
  public void useFilter() throws Exception {
    //#filter
    final ExecutionContext ec = system.dispatcher();
    Future<Integer> future1 = Futures.successful(4);
    Future<Integer> successfulFilter = future1.filter(Filter.filterOf(
      new Function<Integer, Boolean>() {
        public Boolean apply(Integer i) {
          return i % 2 == 0;

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  }


  @Test
  public void useAndThen() {
    //#and-then
    final ExecutionContext ec = system.dispatcher();
    Future<String> future1 = Futures.successful("value").andThen(
      new OnComplete<String>() {
        public void onComplete(Throwable failure, String result) {
          if (failure != null)
            sendToIssueTracker(failure);

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  }


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


    Future<Integer> future = future(new Callable<Integer>() {
      public Integer call() {
        return 1 / 0;
      }

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  }


  @Test
  public void useTryRecover() throws Exception {
    //#try-recover
    final ExecutionContext ec = system.dispatcher();


    Future<Integer> future = future(new Callable<Integer>() {
      public Integer call() {
        return 1 / 0;
      }

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  public void useOnSuccessOnFailureAndOnComplete() throws Exception {
    {
      Future<String> future = Futures.successful("foo");


      //#onSuccess
      final ExecutionContext ec = system.dispatcher();


      future.onSuccess(new OnSuccess<String>() {
        public void onSuccess(String result) {
          if ("bar" == result) {
            //Do something if it resulted in "bar"
          } else {
            //Do something if it was some other String
          }
        }
      }, ec);
      //#onSuccess
    }
    {
      Future<String> future = Futures.failed(new IllegalStateException("OHNOES"));
      //#onFailure
      final ExecutionContext ec = system.dispatcher();


      future.onFailure(new OnFailure() {
        public void onFailure(Throwable failure) {
          if (failure instanceof IllegalStateException) {
            //Do something if it was this particular failure
          } else {
            //Do something if it was some other failure
          }
        }
      }, ec);
      //#onFailure
    }
    {
      Future<String> future = Futures.successful("foo");
      //#onComplete
      final ExecutionContext ec = system.dispatcher();


      future.onComplete(new OnComplete<String>() {
        public void onComplete(Throwable failure, String result) {
          if (failure != null) {
            //We got a failure, handle it here

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  @Test
  public void useOrAndZip() throws Exception {
    {
      //#zip
      final ExecutionContext ec = system.dispatcher();
      Future<String> future1 = Futures.successful("foo");
      Future<String> future2 = Futures.successful("bar");
      Future<String> future3 = future1.zip(future2).map(
        new Mapper<scala.Tuple2<String, String>, String>() {
          public String apply(scala.Tuple2<String, String> zipped) {

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