code: public void closeConnection(RpcClient rpcClient, ClientTransportConfig transportConfig, Url url) {
          if (rpcClient == null || transportConfig == null || url == null) {
              return;
          }
          //TODO do not close
      }
docs: 关闭长连接
  
  @param rpcClient       bolt客户端
  @param transportConfig 传输层配置
  @param url             传输层地址