function __construct($processor)
{
parent::__construct($processor);
$this->columnToSortByBeforeTruncation = Metrics::INDEX_NB_VISITS;
$this->maximumRowsInDataTable = Config::getInstance()->General['datatable_archiving_maximum_rows_events'];
$this->maximumRowsInSubDataTable = Config::getInstance()->General['datatable_archiving_maximum_rows_subtable_events'];
}