docs: public void handleNotification(Notification notification, Object handback) {
          Map event = (Map) handback;
          if (event != null) {
              Object del = event.get("managedObject");
              Object callback = event.get("callback");
              if (callback != null && callback instanceof Closure) {
                  Closure closure = (Closure) callback;
                  closure.setDelegate(del);
                  if (closure.getMaximumNumberOfParameters() == 1)
                      closure.call(buildOperationNotificationPacket(notification));
                  else closure.call();
              }
          }
      }