code: public void requestCompleted (T result)
      {
          if (_chain != null) {
              _chain.requestCompleted(result);
  
          } else if (_invChain instanceof InvocationService.ResultListener) {
              ((InvocationService.ResultListener)_invChain).requestProcessed(result);
  
          } else if (_invChain instanceof InvocationService.ConfirmListener) {
              ((InvocationService.ConfirmListener)_invChain).requestProcessed();
          }
      }
docs: Override this to handle a request completion in your own way.