public function plugin_statistics_service_usage($params)
{
$dao = new Tracker_ArtifactDao();
$start_date = strtotime($params['start_date']);
$end_date = strtotime($params['end_date']);
$number_of_open_artifacts_between_two_dates = $dao->searchSubmittedArtifactBetweenTwoDates($start_date, $end_date);
$number_of_closed_artifacts_between_two_dates = $dao->searchClosedArtifactBetweenTwoDates($start_date, $end_date);
$params['csv_exporter']->buildDatas($number_of_open_artifacts_between_two_dates, "Trackers v5 - Opened Artifacts");
$params['csv_exporter']->buildDatas($number_of_closed_artifacts_between_two_dates, "Trackers v5 - Closed Artifacts");
}
