Count existingCounter;
    int oldCount;
    if (count == 0) {
      existingCounter = backingMap.remove(element);
      oldCount = getAndSet(existingCounter, count);
    } else {
      existingCounter = backingMap.get(element);
      oldCount = getAndSet(existingCounter, count);

      if (existingCounter == null) {
        backingMap.put(element, new Count(count));
      }
    }

          public void run() {
            assertFalse("previous tearDown should have run before setUp", setUpRan.getAndSet(true));
          }
        };
    Runnable tearDown =
        new Runnable() {
          @Override
          public void run() {
            assertTrue("setUp should have run", setUpRan.getAndSet(false));
          }
        };
    return MapTestSuiteBuilder.using(new CheckSetUpHashMapGenerator(setUpRan))

    @Nullable Listener gasListeners(AbstractFutureState<?> future, Listener update) {
      return (Listener) listenersUpdater.getAndSet(future, update);
    }

    @Override
    @Nullable Waiter gasWaiters(AbstractFutureState<?> future, Waiter update) {
      return (Waiter) waitersUpdater.getAndSet(future, update);
    }

    @Override

          public void run() {
            assertFalse("previous tearDown should have run before setUp", setUpRan.getAndSet(true));
          }
        };
    Runnable tearDown =
        new Runnable() {
          @Override
          public void run() {
            assertTrue("setUp should have run", setUpRan.getAndSet(false));
          }
        };
    return MapTestSuiteBuilder.using(new CheckSetUpHashMapGenerator(setUpRan))

   *
   * @param i the index
   * @param newValue the new value
   * @return the previous value
   */
  public final double getAndSet(int i, double newValue) {
    long next = doubleToRawLongBits(newValue);
    return longBitsToDouble(longs.getAndSet(i, next));
  }

  /**
   * Atomically sets the element at position {@code i} to the given updated value if the current

    @Override
    @Nullable Listener gasListeners(AbstractFutureState<?> future, Listener update) {
      return listenersUpdater.getAndSet(future, update);
    }

    @Override
    @Nullable Waiter gasWaiters(AbstractFutureState<?> future, Waiter update) {
      return waitersUpdater.getAndSet(future, update);
    }

    @Override
    boolean casValue(AbstractFutureState<?> future, @Nullable Object expect, Object update) {

        log.info("Circuit breaker {} reset", name);
    }

    /**
     * Force the circuit to open
     */
    public void tripBreaker() {
        State previous = state.getAndSet(State.OPEN);
        if (previous != State.OPEN) {
            stateChangeTime.set(System.currentTimeMillis());
            lastFailureTime.set(System.currentTimeMillis());

                if (waitForState(transport) == 2) {
                    // already connected
                    return null;
                }
                final int before = this.connectionState.getAndSet(1);
                if (before == 1) {
                    // concurrent connection attempt
                    if (waitForState(transport) == 2) {
                        // finished connecting

        // not all.  See the test cases for examples on how this can happen.
        try {
          ((Thread) currentRunner).interrupt();
        } finally {
          Runnable prev = getAndSet(DONE);
          if (prev == PARKED) {
            LockSupport.unpark((Thread) currentRunner);
          }
        }
      }
    }
  }

  /**

        return timeSinceLastFailure >= resetTimeoutMillis;
    }

    private void transitionTo(State newState) {
        State oldState = state.getAndSet(newState);
        lastStateChangeTime.set(System.currentTimeMillis());

        if (oldState != newState) {
            log.info("[{}] Circuit breaker state transition: {} -> {}", name, oldState, newState);