assertEquals(0L, map.get(key));
    assertFalse(map.containsKey(key));

    assertEquals(-1L, map.decrementAndGet(key));
    assertEquals(-1L, map.get(key));

    assertEquals(0L, map.incrementAndGet(key));
    assertEquals(0L, map.get(key));
    assertTrue(map.containsKey(key));

    assertEquals(-1L, map.decrementAndGet(key));
    assertEquals(-1L, map.get(key));
  }

  public void testGetAndDecrement() {

    assertEquals(0L, map.get(key));
    assertFalse(map.containsKey(key));

    assertEquals(-1L, map.decrementAndGet(key));
    assertEquals(-1L, map.get(key));

    assertEquals(0L, map.incrementAndGet(key));
    assertEquals(0L, map.get(key));
    assertTrue(map.containsKey(key));

    assertEquals(-1L, map.decrementAndGet(key));
    assertEquals(-1L, map.get(key));
  }

  public void testGetAndDecrement() {

    // by executing on the same thread.
    if (executorService.isShutdown) {
      for (i in 0 until executableCalls.size) {
        val asyncCall = executableCalls[i]
        asyncCall.callsPerHost.decrementAndGet()

        this.withLock {
          runningAsyncCalls.remove(asyncCall)
        }

        asyncCall.failRejected()
      }
      idleCallback?.run()
    } else {

                      case 0:
                        map.incrementAndGet(key);
                        threadSum++;
                        break;
                      case 1:
                        map.decrementAndGet(key);
                        threadSum--;
                        break;
                      case 2:
                        map.addAndGet(key, delta);
                        threadSum += delta;

      seenExceptionsUpdater.compareAndSet(state, expect, update);
    }

    @Override
    int decrementAndGetRemainingCount(AggregateFutureState<?> state) {
      return remainingCountUpdater.decrementAndGet(state);
    }
  }

  private static final class SynchronizedAtomicHelper extends AtomicHelper {
    @Override
    void compareAndSetSeenExceptions(

                      case 0:
                        map.incrementAndGet(key);
                        threadSum++;
                        break;
                      case 1:
                        map.decrementAndGet(key);
                        threadSum--;
                        break;
                      case 2:
                        map.addAndGet(key, delta);
                        threadSum += delta;

            count = new AtomicInteger(1);
        }

        public int increment() {
            return count.incrementAndGet();
        }

        public int decrement() {
            return count.decrementAndGet();
        }
    }

    public enum StatsAction {
        ACCESSED, //
        ACCESS_EXCEPTION, //
        CHILD_URL, //
        CHILD_URLS, //
        EVALUATED, //
        EXCEPTION, //

    return addAndGet(key, 1);
  }

  /**
   * Decrements by one the value currently associated with {@code key}, and returns the new value.
   */
  @CanIgnoreReturnValue
  public long decrementAndGet(K key) {
    return addAndGet(key, -1);
  }

  /**
   * Adds {@code delta} to the value currently associated with {@code key}, and returns the new
   * value.
   */
  @CanIgnoreReturnValue

    public void release () {
        release(true);
    }


    /**
     * @param track
     */
    public void release ( boolean track ) {
        long usage = this.usageCount.decrementAndGet();
        if ( log.isTraceEnabled() ) {
            log.trace("Release tree " + usage + " " + this);
        }

        if ( track && this.traceResource ) {
            synchronized ( this.releases ) {

    removeFromReplica(replica, replicatedMaxValue);
  }

  private static void removeFromReplica(Map<Integer, AtomicInteger> replica, int value) {
    AtomicInteger numOccur = replica.get(value);
    if (numOccur.decrementAndGet() == 0) {
      replica.remove(value);
    }
  }

  private static void assertIntact(MinMaxPriorityQueue<?> q) {
    if (!q.isIntact()) {
      fail("State " + Arrays.toString(q.toArray()));
    }