code: public Set<Method> subscriptionsOn(Object subscriber) {
          SubscriptionMethodFilter filter = new SubscriptionMethodFilter();
          Class<?> subscriberClass = subscriber.getClass();
          List<Method> methods = Arrays.asList(subscriberClass.getMethods());
          Set<Method> subscriptions = new HashSet<Method>();
          for (Method method : methods) {
              if (filter.accepts(method)) {
                  subscriptions.add(method);
              }
          }
          return subscriptions;
      }
docs: Report the subscription methods declared on the subscriber.