private function displayBatchInfo($batch)
    {
        if ($batch['Status'] == 'Completed') {
            return sprintf('batch %s is Completed, %d operations %s', $batch['JobID'], $batch['Count'], $batch['Error']);
        } else {
            return sprintf('batch %s, current status %s, %d operations %s', $batch['JobID'], $batch['Status'], $batch['Count'], $batch['Error']);
        }
    }