code: static Map<Class<?>, Set<EventHandler>> findAllSubscribers(Object listener) {
      Class<?> listenerClass = listener.getClass();
      Map<Class<?>, Set<EventHandler>> handlersInMethod = new HashMap<Class<?>, Set<EventHandler>>();
  
      Map<Class<?>, Set<Method>> methods = SUBSCRIBERS_CACHE.get(listenerClass);
      if (null == methods) {
        methods = new HashMap<Class<?>, Set<Method>>();
        loadAnnotatedSubscriberMethods(listenerClass, methods);
      }
      if (!methods.isEmpty()) {
        for (Map.Entry<Class<?>, Set<Method>> e : methods.entrySet()) {
          Set<EventHandler> handlers = new HashSet<EventHandler>();
          for (Method m : e.getValue()) {
            handlers.add(new EventHandler(listener, m));
          }
          handlersInMethod.put(e.getKey(), handlers);
        }
      }
  
      return handlersInMethod;
    }
docs: This implementation finds all methods marked with a {@link Subscribe} annotation.