code: def run_once(self):
          '''comsume queues and feed tasks to fetcher, once'''
  
          self._update_projects()
          self._check_task_done()
          self._check_request()
          while self._check_cronjob():
              pass
          self._check_select()
          self._check_delete()
          self._try_dump_cnt(f run_once(self):
          '''comsume queues and feed tasks to fetcher, once'''
  
          self._update_projects()
          self._check_task_done()
          self._check_request()
          while self._check_cronjob():
              pass
          self._check_select()
          self._check_delete()
          self._try_dump_cnt()
docs: comsume queues and feed tasks to fetcher, once