docs: @Override
      public void process(WatchedEvent event) {
  
          //
          // 结点更新时
          //
          if (event.getType() == EventType.NodeDataChanged) {
  
              try {
  
                  LOGGER.info("============GOT UPDATE EVENT " + event.toString() + ": (" + monitorPath + "," + keyName
                          + "," + disConfigTypeEnum.getModelName() + ")======================");
  
                  // 调用回调函数, 回调函数里会重新进行监控
                  callback();
  
              } catch (Exception e) {
  
                  LOGGER.error("monitor node exception. " + monitorPath, e);
              }
          }
  
          //
          // 结点断开连接，这时不要进行处理
          //
          if (event.getState() == KeeperState.Disconnected) {
  
              if (!debug) {
                  LOGGER.warn("============GOT Disconnected EVENT " + event.toString() + ": (" + monitorPath + ","
                          + keyName + "," + disConfigTypeEnum.getModelName() + ")======================");
              } else {
                  LOGGER.debug("============DEBUG MODE: GOT Disconnected EVENT " + event.toString() + ": (" +
                          monitorPath +
                          "," +
                          keyName +
                          "," + disConfigTypeEnum.getModelName() + ")======================");
              }
          }
  
          //
          // session expired，需要重新关注哦
          //
          if (event.getState() == KeeperState.Expired) {
  
              if (!debug) {
  
                  LOGGER.error("============GOT Expired  " + event.toString() + ": (" + monitorPath + "," + keyName
                          + "," + disConfigTypeEnum.getModelName() + ")======================");
  
                  // 重新连接
                  ZookeeperMgr.getInstance().reconnect();
  
                  callback();
              } else {
                  LOGGER.debug("============DEBUG MODE: GOT Expired  " + event.toString() + ": (" + monitorPath + ","
                          + "" + keyName + "," + disConfigTypeEnum.getModelName() + ")======================");
              }
          }
      }