code: def flush(self):
          
          if self._cache is None:
              return _NO_RESULTS
          with self._cache as c:
              flushed_ops = [x.as_operation() for x in c.out_deque]
              c.out_deque.clear()
              reqs = []
              max_ops = self.MAX_OPERATION_COUNT
              for x in range(0, len(flushed_ops), max_ops):
                  report_request = sc_messages.ReportRequest(
                      operations=flushed_ops[x:x + max_ops])
                  reqs.append(
                      sc_messages.ServicecontrolServicesReportRequest(
                          serviceName=self.service_name,
                          reportRequest=report_request))
  
              return reqs
docs: Flushes this instance's cache.
  
          The driver of this instance should call this method every
          `flush_interval`.
  
          Returns:
            list[``ServicecontrolServicesReportRequest``]: corresponding to the
              pending cached operations