static Subscriber create(EventBus bus, Object listener, Method method) {
    return isDeclaredThreadSafe(method)
        ? new Subscriber(bus, listener, method)
        : new SynchronizedSubscriber(bus, listener, method);
  }

  /** The event bus this subscriber belongs to. */
  @Weak private final EventBus bus;

  /** The object with the subscriber method. */
  @VisibleForTesting final Object target;

    for (Entry<Class<?>, Collection<Subscriber>> entry : listenerMethods.asMap().entrySet()) {
      Class<?> eventType = entry.getKey();
      Collection<Subscriber> eventMethodsInListener = entry.getValue();

      CopyOnWriteArraySet<Subscriber> eventSubscribers = subscribers.get(eventType);

      if (eventSubscribers == null) {
        CopyOnWriteArraySet<Subscriber> newSet = new CopyOnWriteArraySet<>();
        eventSubscribers =

    assertEquals("Event should be available.", EVENT, handler.context.getEvent());
    assertEquals("Subscriber should be available.", subscriber, handler.context.getSubscriber());
    assertEquals(
        "Method should be available.",
        subscriber.getClass().getMethod("throwExceptionOn", String.class),
        handler.context.getSubscriberMethod());
  }

        .containsExactly(
            i1, s1, s2, // Each integer subscriber immediately dispatches to 2 string subscribers.
            i2, s1, s2, i3, s1, s2)
        .inOrder();
  }

  private static Subscriber subscriber(
      EventBus bus, Object target, String methodName, Class<?> eventType) {
    try {
      return Subscriber.create(bus, target, target.getClass().getMethod(methodName, eventType));

 * the {@link EventBus}.
 *
 * <p>Unless also annotated with @{@link AllowConcurrentEvents}, event subscriber methods will be
 * invoked serially by each event bus that they are registered with.
 *
 * @author Cliff Biffle
 * @since 10.0
 */
@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.METHOD)
@Keep

      private final Object event;
      private final Subscriber subscriber;

      private EventWithSubscriber(Object event, Subscriber subscriber) {
        this.event = event;
        this.subscriber = subscriber;
      }
    }
  }

  /** Implementation of {@link #immediate()}. */
  private static final class ImmediateDispatcher extends Dispatcher {

import static com.google.common.truth.Truth.assertThat;

import com.google.common.eventbus.Subscribe;
import com.google.common.eventbus.outside.BaseSubscriberFinderTest.Subscriber;
import java.util.ArrayList;
import java.util.List;

public class BaseSubscriberFinderTest extends AbstractEventBusTest<Subscriber> {
  static class Subscriber {
    final List<Object> nonSubscriberEvents = new ArrayList<>();

import static com.google.common.truth.Truth.assertThat;

import com.google.common.eventbus.Subscribe;
import com.google.common.eventbus.outside.BaseSubscriberFinderTest.Subscriber;
import java.util.ArrayList;
import java.util.List;

public class BaseSubscriberFinderTest extends AbstractEventBusTest<Subscriber> {
  static class Subscriber {
    final List<Object> nonSubscriberEvents = new ArrayList<>();

    @Subscribe
    public void notOverriddenInSubclass(Object o) {
      notOverriddenInSubclassEvents.add(o);
    }

    @Subscribe
    public void overriddenNotAnnotatedInSubclass(Object o) {
      overriddenNotAnnotatedInSubclassEvents.add(o);
    }

    @Subscribe
    public void overriddenAndAnnotatedInSubclass(Object o) {

@NullUnmarked
public class StringCatcher {
  private final List<String> events = new ArrayList<>();

  @Subscribe
  public void hereHaveAString(@Nullable String string) {
    events.add(string);
  }

  public void methodWithoutAnnotation(@Nullable String string) {
    Assert.fail("Event bus must not call methods without @Subscribe!");
  }

  public List<String> getEvents() {
    return events;
  }