docs: public void execute(@Param("channelId") Long channelId, @Param("pageIndex") int pageIndex,
                          @Param("searchKey") String searchKey, Context context, Navigator nav) throws Exception {
          Channel channel = channelService.findById(channelId);
          if (channel.getStatus().isStart()) {
              nav.redirectTo(WebConstant.ERROR_FORBIDDEN_Link);
              return;
          }
          context.put("channel", channel);
          context.put("pageIndex", pageIndex);
          context.put("searchKey", searchKey);
      }