code: public void post(Object event) {
      Iterator<Subscriber> eventSubscribers = subscribers.getSubscribers(event);
      if (eventSubscribers.hasNext()) {
        dispatcher.dispatch(event, eventSubscribers);
      } else if (!(event instanceof DeadEvent)) {
        // the event had no subscribers and was not itself a DeadEvent
        post(new DeadEvent(this, event));
      }
    }
docs: Posts an event to all registered subscribers. This method will return successfully after the
  event has been posted to all subscribers, and regardless of any exceptions thrown by
  subscribers.
  
  <p>If no subscribers have been subscribed for {@code event}'s class, and {@code event} is not
  already a {@link DeadEvent}, it will be wrapped in a DeadEvent and reposted.
  
  @param event event to post.