code: public void unregister(EventDefinition eventDefinition, IEventListener eventListener) {
          if (eventDefinition.getType() == EventDefinition.TYPE_POST) {
              unregister(listenersPost, eventDefinition, eventListener);
          } else {
              unregister(listeners, eventDefinition, eventListener);
          }
      }
docs: Stop listening to an event.
  
  @param eventDefinition
  @param eventListener