}

    /**
     * Grant a send credit
     */
    public void grantSendCredit() {
        sendCredits.incrementAndGet();
    }

    /**
     * Grant a receive credit
     */
    public void grantReceiveCredit() {
        receiveCredits.incrementAndGet();
    }

    /**
     * Get number of available send credits
     *
     * @return available send credits
     */

            int behavior = random.nextInt(4);
            if (behavior == 0) { // throw an exception
              exceptionCount.incrementAndGet();
              throw new RuntimeException("fake exception for test");
            } else if (behavior == 1) { // return null
              computeNullCount.incrementAndGet();
              return null;
            } else if (behavior == 2) { // slight delay before returning

            int behavior = random.nextInt(4);
            if (behavior == 0) { // throw an exception
              exceptionCount.incrementAndGet();
              throw new RuntimeException("fake exception for test");
            } else if (behavior == 1) { // return null
              computeNullCount.incrementAndGet();
              return null;
            } else if (behavior == 2) { // slight delay before returning

        for (int i = 0; i < numThreads; i++) {
            executor.submit(() -> {
                try {
                    fesenClient.addOnConnectListener(() -> callbackCount.incrementAndGet());
                } finally {
                    latch.countDown();
                }
            });
        }

        latch.await(5, TimeUnit.SECONDS);
        executor.shutdown();

    EventBus bus = new EventBus();
    bus.register(
        new Object() {
          @Subscribe
          public void accept(String str) {
            holder.set(str);
            deliveries.incrementAndGet();
          }
        });

    String EVENT = "Hello!";
    bus.post(EVENT);

    assertEquals("Only one event should be delivered.", 1, deliveries.get());

     * Increments the active thread count and returns the new value.
     * @return The incremented active thread count.
     */
    public int incrementAndGetActiveThreadCount() {
        return activeThreadCount.incrementAndGet();
    }

    /**
     * Decrements the active thread count and returns the new value.
     * @return The decremented active thread count.
     */
    public int decrementAndGetActiveThreadCount() {

        }

        public int getActiveConnections() {
            return activeConnections.get();
        }

        public void incrementConnections() {
            activeConnections.incrementAndGet();
        }

        public void decrementConnections() {
            activeConnections.decrementAndGet();
        }

        public boolean isHealthy() {
            return isHealthy;
        }

              numSuccessfulSetCalls.incrementAndGet();
            }
            awaitUnchecked(barrier);
            return null;
          }
        };
    Callable<@Nullable Void> cancelRunnable =
        () -> {
          if (currentFuture.get().cancel(true)) {
            numSuccessfulSetCalls.incrementAndGet();
          }
          awaitUnchecked(barrier);

    EventBus bus = new EventBus();
    bus.register(
        new Object() {
          @Subscribe
          public void accept(String str) {
            holder.set(str);
            deliveries.incrementAndGet();
          }
        });

    String EVENT = "Hello!";
    bus.post(EVENT);

    assertEquals("Only one event should be delivered.", 1, deliveries.get());

  @Param Impl impl;
  Executor executor;

  static final class CountingRunnable implements Runnable {
    AtomicInteger integer = new AtomicInteger();

    @Override
    public void run() {
      integer.incrementAndGet();
    }
  }

  CountingRunnable countingRunnable = new CountingRunnable();

  Set<Thread> threads = new HashSet<>();

  @BeforeExperiment
  void before() {
    executor = impl.executor();