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<?php
// This file is part of Moodle - http://moodle.org/
//
// Moodle is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Moodle is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Moodle. If not, see <http://www.gnu.org/licenses/>.
/**
* Task to cleanup old question previews.
*
* @package core
* @copyright 2013 onwards Martin Dougiamas http://dougiamas.com
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
namespace core\task;
/**
* A task to cleanup old question previews.
*
* @copyright 2013 onwards Martin Dougiamas http://dougiamas.com
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
class question_preview_cleanup_task extends scheduled_task {
/**
* Get a descriptive name for this task (shown to admins).
*
* @return string
*/
public function get_name() {
return get_string('taskquestioncron', 'admin');
}
/**
* Do the job.
* Throw exceptions on errors (the job will be retried).
*/
public function execute() {
global $CFG;
require_once($CFG->dirroot . '/question/engine/lib.php');
// We delete previews that have not been touched for 24 hours.
$lastmodifiedcutoff = time() - DAYSECS;
mtrace("\n Cleaning up old question previews...", '');
$oldpreviews = new \qubaid_join('{question_usages} quba', 'quba.id',
'quba.component = :qubacomponent
AND NOT EXISTS (
SELECT 1
FROM {question_attempts} subq_qa
JOIN {question_attempt_steps} subq_qas ON subq_qas.questionattemptid = subq_qa.id
JOIN {question_usages} subq_qu ON subq_qu.id = subq_qa.questionusageid
WHERE subq_qa.questionusageid = quba.id
AND subq_qu.component = :qubacomponent2
AND (subq_qa.timemodified > :qamodifiedcutoff
OR subq_qas.timecreated > :stepcreatedcutoff)
)
',
['qubacomponent' => 'core_question_preview', 'qubacomponent2' => 'core_question_preview',
'qamodifiedcutoff' => $lastmodifiedcutoff, 'stepcreatedcutoff' => $lastmodifiedcutoff]);
\question_engine::delete_questions_usage_by_activities($oldpreviews);
mtrace('done.');
}
}