lib/classes/task/question_stats_cleanup_task.php

   1 <?php
   2 // This file is part of Moodle - http://moodle.org/
   3 //
   4 // Moodle is free software: you can redistribute it and/or modify
   5 // it under the terms of the GNU General Public License as published by
   6 // the Free Software Foundation, either version 3 of the License, or
   7 // (at your option) any later version.
   8 //
   9 // Moodle is distributed in the hope that it will be useful,
  10 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 // GNU General Public License for more details.
  13 //
  14 // You should have received a copy of the GNU General Public License
  15 // along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
  16
  17 /**
  18  * Task to cleanup old question statistics cache.
  19  *
  20  * @package    core
  21  * @copyright  2019 Simey Lameze <simey@moodle.com>
  22  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  23  */
  24 namespace core\task;
  25
  26 defined('MOODLE_INTERNAL') || die();
  27
  28 /**
  29  * A task to cleanup old question statistics cache.
  30  *
  31  * @copyright  2019 Simey Lameze <simey@moodle.com>
  32  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  33  */
  34 class question_stats_cleanup_task extends scheduled_task {
  35
  36     /**
  37      * Get a descriptive name for this task (shown to admins).
  38      *
  39      * @return string
  40      */
  41     public function get_name() {
  42         return get_string('taskquestionstatscleanupcron', 'admin');
  43     }
  44
  45     /**
  46      * Perform the cleanup task.
  47      */
  48     public function execute() {
  49         global $DB;
  50
  51         mtrace("\n  Cleaning up old question statistics cache records...", '');
  52
  53         $expiretime = time() - 5 * HOURSECS;
  54         $DB->delete_records_select('question_statistics', 'timemodified < ?', [$expiretime]);
  55         $responseanlysisids = $DB->get_records_select_menu('question_response_analysis',
  56             'timemodified < ?',
  57             [$expiretime],
  58             'id',
  59             'id, id AS id2');
  60         $DB->delete_records_list('question_response_analysis', 'id', $responseanlysisids);
  61         $DB->delete_records_list('question_response_count', 'analysisid', $responseanlysisids);
  62
  63         mtrace('done.');
  64     }
  65 }