/**
* Garbage collection
*
* @throws Session_Exception
*/
protected function _gc()
{
if ($this->_lifetime) {
// Expire sessions when their lifetime is up
$expires = $this->_lifetime;
} else {
// Expire sessions after one month
$expires = Date::MONTH;
}
$expired = __('this.:column < :time', array(':column' => $this->_columns['last_active'], ':time' => time() - $expires));
try {
$this->_collection->safeRemove(array('$where' => $expired));
} catch (MongoException $e) {
throw new Session_Exception('Cannot delete old sessions :err', array(':err' => $e->getMessage()));
} catch (Exception $e) {
throw new Session_Exception('Cannot delete old sessions :err', array(':err' => $this->_db->lastError()));
}
}
