SubscriberStageFactory implements TerminalStageFactory<Stage.SubscriberStage> { @SuppressWarnings("unchecked") @Override public <I, O> TerminalStage<I, O> create(Engine engine, Stage.SubscriberStage stage) { Subscriber<I> subscriber = (Subscriber<I>) Objects.requireNonNull(stage).getRsSubscriber(); Objects.requireNonNull(subscriber); return (TerminalStage<I, O>) new SubscriberStage<>(subscriber); }  @SuppressWarnings("unchecked") @Override TerminalStage<I, O> create(Engine engine, Stage.SubscriberStage stage);  }
@Test public void create() { Flowable<Integer> flowable = Flowable.fromArray(1, 2, 3, 4, 5, 6, 7, 8, 9, 10) .subscribeOn(Schedulers.computation()); SubscriberBuilder<Integer, Optional<Integer>> builder = ReactiveStreams.<Integer> builder().findFirst(); Optional<Integer> optional = ReactiveStreams.fromPublisher(flowable).filter(i -> i > 5) .to(builder).run().toCompletableFuture().join(); assertThat(optional).contains(6); }
@Test(expected = NullPointerException.class) public void createWithoutStage() { factory.create(new Engine(), null); }
@Test(expected = NullPointerException.class) public void createWithoutSubscriber() { factory.create(new Engine(), () -> null); }