code: public Channel findByPipelineId(Long pipelineId) {
          Pipeline pipeline = pipelineService.findById(pipelineId);
          Channel channel = findById(pipeline.getChannelId());
          return channel;
      }
docs: <pre>
  根据PipelineID找到对应的Channel
  优化设想：
  应该通过变长参数达到后期扩展的方便性
  </pre>