public function continue_job(JobParameters $job_parameters, $batch_size = 50)
 {
     $csv_data = $this->get_csv_data($job_parameters->units_processed(), $batch_size);
     \EEH_Export::write_data_array_to_csv($job_parameters->extra_datum('filepath'), $csv_data, false);
     $units_processed = count($csv_data);
     $job_parameters->mark_processed($units_processed);
     $extra_response_data = array('file_url' => '');
     if ($units_processed < $batch_size) {
         $job_parameters->set_status(JobParameters::status_complete);
         $extra_response_data['file_url'] = $this->get_url_to_file($job_parameters->extra_datum('filepath'));
     }
     return new JobStepResponse($job_parameters, sprintf(__('Wrote %1$s rows to report CSV file...', 'event_espresso'), count($csv_data)), $extra_response_data);
 }