示例#1
0
 @Test
 public void mustWorkFromFuture() throws Exception {
   final Iterable<String> input = Arrays.asList("A", "B", "C");
   CompletionStage<String> future1 = Source.from(input).runWith(Sink.<String>head(), materializer);
   CompletionStage<String> future2 =
       Source.fromCompletionStage(future1).runWith(Sink.<String>head(), materializer);
   String result = future2.toCompletableFuture().get(3, TimeUnit.SECONDS);
   assertEquals("A", result);
 }
示例#2
0
  @Test
  public void demonstrateAnAsynchronousSideChannel() throws Exception {

    // tests:
    CompletableFuture<Done> switchF = new CompletableFuture<>();
    Graph<FlowShape<Integer, Integer>, NotUsed> killSwitch =
        Flow.fromGraph(new KillSwitch<>(switchF));

    ExecutionContext ec = system.dispatcher();

    CompletionStage<Integer> valueAfterKill = switchF.thenApply(in -> 4);

    CompletionStage<Integer> result =
        Source.from(Arrays.asList(1, 2, 3))
            .concat(Source.fromCompletionStage(valueAfterKill))
            .via(killSwitch)
            .runFold(0, (n, sum) -> n + sum, mat);

    switchF.complete(Done.getInstance());

    assertEquals(new Integer(6), result.toCompletableFuture().get(3, TimeUnit.SECONDS));
  }