Examples of org.reactivestreams.Subscription

org.reactivestreams.Subscription
A {@link Subscription} represents a one-to-one lifecycle of a {@link Subscriber} subscribing to a {@link Publisher}.
It can only be used once by a single {@link Subscriber}.
It is used to both signal desire for data and cancel demand (and allow resource cleanup).

  public void spec205_mustCallSubscriptionCancelIfItAlreadyHasAnSubscriptionAndReceivesAnotherOnSubscribeSignal() throws Exception {
    new WhiteboxTestStage(env) {{
      // try to subscribe another time, if the subscriber calls `probe.registerOnSubscribe` the test will fail
      final Latch secondSubscriptionCancelled = new Latch(env);
      sub().onSubscribe(
          new Subscription() {
            @Override
            public void request(long elements) {
              env.flop(String.format("Subscriber %s illegally called `subscription.request(%s)`", sub(), elements));
            }

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    @Override
    public void subscribe(final Subscriber<? super Integer> s) {


        final AtomicInteger i = new AtomicInteger();


        Subscription subscription = new Subscription() {


            AtomicLong capacity = new AtomicLong();


            @Override
            public void request(long n) {

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            subs.request(1);
          }


          @Override
          public void onNext(T element) {
            Subscription subs = this.subscription.value();
            subs.request(1);
          }
        };


        env.subscribe(pub, sub);

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      @Override
      public void run(Publisher<T> pub) throws Throwable {
        final ManualSubscriber<T> sub = env.newManualSubscriber(pub);


        // leak the Subscription
        final Subscription subs = sub.subscription.value();


        subs.cancel();
        subs.cancel();
        subs.cancel();


        sub.expectNone();
        env.verifyNoAsyncErrors();
      }
    });

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  @Required @Test
  public void spec203_blackbox_mustNotCallMethodsOnSubscriptionOrPublisherInOnComplete() throws Throwable {
    blackboxSubscriberWithoutSetupTest(new BlackboxTestStageTestRun() {
      @Override
      public void run(BlackboxTestStage stage) throws Throwable {
        final Subscription subs = new Subscription() {
          @Override
          public void request(long n) {
            final Throwable thr = new Throwable();
            for (StackTraceElement stackElem : thr.getStackTrace()) {
              if (stackElem.getMethodName().equals("onComplete")) {

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  @Required @Test
  public void spec203_blackbox_mustNotCallMethodsOnSubscriptionOrPublisherInOnError() throws Throwable {
    blackboxSubscriberWithoutSetupTest(new BlackboxTestStageTestRun() {
      @Override
      public void run(BlackboxTestStage stage) throws Throwable {
        final Subscription subs = new Subscription() {
          @Override
          public void request(long n) {
            final Throwable thr = new Throwable();
            for (StackTraceElement stackElem : thr.getStackTrace()) {
              if (stackElem.getMethodName().equals("onError")) {

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  public void spec205_blackbox_mustCallSubscriptionCancelIfItAlreadyHasAnSubscriptionAndReceivesAnotherOnSubscribeSignal() throws Exception {
    new BlackboxTestStage(env) {{
      // try to subscribe another time, if the subscriber calls `probe.registerOnSubscribe` the test will fail
      final TestEnvironment.Latch secondSubscriptionCancelled = new TestEnvironment.Latch(env);
      sub().onSubscribe(
          new Subscription() {
            @Override
            public void request(long elements) {
              env.flop(String.format("Subscriber %s illegally called `subscription.request(%s)`!", sub(), elements));
            }

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    @Override
    public void subscribe(Subscriber<? super T> s) {
      if (!subscriber.isCompleted()) {
        subscriber.completeImmediatly(s);


        Subscription subs = new Subscription() {
          @Override
          public void request(long elements) {
            requests.add(elements);
          }

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Related Classes of org.reactivestreams.Subscription

org.reactivestreams.example.multicast.StockPricePublisher

org.reactivestreams.example.unicast.InfiniteIncrementNumberPublisher

org.reactivestreams.tck.PublisherVerification

org.reactivestreams.tck.SubscriberBlackboxVerification

org.reactivestreams.tck.SubscriberWhiteboxVerification

org.reactivestreams.tck.TestEnvironment$ManualPublisher

ratpack.stream.internal.GatedPublisher

ratpack.stream.internal.MergingPublisher

ratpack.stream.internal.MulticastPublisher

ratpack.stream.internal.PeriodicPublisher

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