code: def RunOnce(self, names=None, token=None):
      
      del token
  
      leased_jobs = data_store.REL_DB.LeaseCronJobs(
          cronjob_ids=names, lease_time=rdfvalue.Duration("10m"))
      logging.info("Leased %d cron jobs for processing.", len(leased_jobs))
      if not leased_jobs:
        return
  
      errors = {}
      processed_count = 0
      for job in sorted(leased_jobs, key=lambda j: j.cron_job_id):
        if self.TerminateStuckRunIfNeeded(job):
          continue
  
        if not self.JobDueToRun(job):
          continue
  
        try:
          if self.RunJob(job):
            processed_count += 1
          else:
            logging.info(
                "Can't schedule cron job %s on a thread pool "
                "(all threads are busy or CPU load is high)", job.cron_job_id)
            break
        except Exception as e:  # pylint: disable=broad-except
          logging.exception("Cron job %s has failed: %s", job.cron_job_id, e)
          errors[job.cron_job_id] = e
  
      logging.info("Processed %d cron jobs.", processed_count)
      data_store.REL_DB.ReturnLeasedCronJobs(leased_jobs)
  
      if errors:
        raise OneOrMoreCronJobsFailedError(errors)
docs: Tries to lock and run cron jobs.
  
      Args:
        names: List of cron jobs to run.  If unset, run them all.
        token: security token.
  
      Raises:
        OneOrMoreCronJobsFailedError: if one or more individual cron jobs fail.
        Note: a failure of a single cron job doesn't preclude other cron jobs
        from running.