code: private Multimap<Class<?>, Subscriber> findAllSubscribers(Object listener) {
      Multimap<Class<?>, Subscriber> methodsInListener = HashMultimap.create();
      Class<?> clazz = listener.getClass();
      for (Method method : getAnnotatedMethods(clazz)) {
        Class<?>[] parameterTypes = method.getParameterTypes();
        Class<?> eventType = parameterTypes[0];
        methodsInListener.put(eventType, Subscriber.create(bus, listener, method));
      }
      return methodsInListener;
    }
docs: Returns all subscribers for the given listener grouped by the type of event they subscribe to.