* specified the JVM flag {@code -XX:+DisableExplicitGC}. But in practice, it works very well for
 * ordinary tests.
 *
 * <p>Failure of the expected event to occur within an implementation-defined "reasonable" time
 * period or an interrupt while waiting for the expected event will result in a {@link
 * RuntimeException}.
 *
 * <p>Here's an example that tests a {@code finalize} method:
 *
 * <pre>{@code

        Platform.tryWeakKeys(new MapMaker()).makeMap();

    private Integer getUid(Object obj) {
      Integer uid = uids.get(obj);
      if (uid == null) {
        // One or more integer values could be skipped in the event of a race
        // to generate a UID for the same object from multiple threads, but
        // that shouldn't be a problem.
        uid = counter.getAndIncrement();
        Integer alreadySet = uids.putIfAbsent(obj, uid);

    // is called within doStart() so we know that the service cannot terminate or fail concurrently
    // with adding this listener so it is impossible to miss an event that we are interested in.
    addListener(
        new Listener() {
          @Override
          public void terminated(State from) {
            executor.shutdown();
          }

          @Override

    queue.enqueue(THROWING_EVENT);
    queue.enqueue(incrementingEvent(counters, listener, 2));
    queue.enqueue(THROWING_EVENT);
    queue.enqueue(incrementingEvent(counters, listener, 3));
    queue.enqueue(THROWING_EVENT);
    queue.enqueue(incrementingEvent(counters, listener, 4));
    queue.enqueue(THROWING_EVENT);
    assertEquals(0, counters.size());
    queue.dispatch();

/**
 * Registry of subscribers to a single event bus.
 *
 * @author Colin Decker
 */
@ElementTypesAreNonnullByDefault
final class SubscriberRegistry {

  /**
   * All registered subscribers, indexed by event type.
   *
   * <p>The {@link CopyOnWriteArraySet} values make it easy and relatively lightweight to get an
   * immutable snapshot of all current subscribers to an event without any locking.
   */

            holder.set(str);
            deliveries.incrementAndGet();
          }
        });

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

    assertEquals("Only one event should be delivered.", 1, deliveries.get());
    assertEquals("Correct string should be delivered.", EVENT, holder.get());
  }

    assertThat(getSubscriber().overriddenInSubclassNowhereAnnotatedEvents).isEmpty();
  }

  public void testOverriddenAndAnnotatedInSubclass() {
    assertThat(getSubscriber().overriddenAndAnnotatedInSubclassEvents).contains(EVENT);
  }

  @Override
  SubClass createSubscriber() {
    return new SubClass();
  }

    assertThat(getSubscriber().overriddenInSubclassNowhereAnnotatedEvents).isEmpty();
  }

  public void testOverriddenAndAnnotatedInSubclass() {
    assertThat(getSubscriber().overriddenAndAnnotatedInSubclassEvents).contains(EVENT);
  }

  @Override
  SubClass createSubscriber() {
    return new SubClass();
  }

  // Modification Operations

  /**
   * {@inheritDoc}
   *
   * @throws IllegalArgumentException if the given value is already bound to a different key in this
   *     bimap. The bimap will remain unmodified in this event. To avoid this exception, call {@link
   *     #forcePut} instead.
   */
  @CanIgnoreReturnValue
  @Override
  @CheckForNull
  V put(@ParametricNullness K key, @ParametricNullness V value);

  /**

     * modifications, or we'll modify the already-built ImmutableMultiset.
     */
    boolean buildInvoked = false;
    /**
     * In the event of a setCount(elem, 0) call, we may need to remove elements, which destroys the
     * insertion order property of ObjectCountHashMap. In that event, we need to convert to a
     * ObjectCountLinkedHashMap, but we need to know we did that so we can convert back.
     */