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