docs: public void doDelete(@Param("channelId") Long channelId, @Param("pageIndex") int pageIndex,
                           @Param("searchKey") String searchKey, Navigator nav) throws WebxException {
          if (channelService.findById(channelId).getStatus().isStart()) {
              nav.redirectTo(WebConstant.ERROR_FORBIDDEN_Link);
              return;
          }
  
          // 如果channel节点下面还有关联的pipeline时，不允许删除
          if (pipelineService.listByChannelIds(channelId).size() < 1) {
              channelService.remove(channelId);
          }
  
          nav.redirectToLocation("channelList.htm?pageIndex=" + pageIndex + "&searchKey=" + urlEncode(searchKey));
      }