code: @Override public void onStatusChange(JobExecutionState state, RunningState previousStatus,
                                         RunningState newStatus) {
      if (_log.isPresent()) {
        _log.get().info("JobExection status change for " + state.getJobSpec().toShortString() +
                        ": " + previousStatus + " --> " + newStatus);
      }
    }
docs: {@inheritDoc}