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   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   * Legacy Cron Quiz Reports Task
  19   *
  20   * @package    quiz_statistics
  21   * @copyright  2017 Michael Hughes, University of Strathclyde
  22   * @author Michael Hughes <michaelhughes@strath.ac.uk>
  23   * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  24   *
  25   */
  26  namespace quiz_statistics\task;
  27  
  28  defined('MOODLE_INTERNAL') || die();
  29  
  30  /**
  31   * Legacy Cron Quiz Reports Task
  32   *
  33   * @package    quiz_statistics
  34   * @copyright  2017 Michael Hughes
  35   * @author Michael Hughes
  36   * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  37   *
  38   */
  39  class quiz_statistics_cleanup extends \core\task\scheduled_task {
  40      public function get_name() {
  41          return get_string('quizstatisticscleanuptask', 'quiz_statistics');
  42      }
  43  
  44      /**
  45       * Run the clean up task.
  46       */
  47      public function execute() {
  48          global $DB;
  49  
  50          $expiretime = time() - 4 * HOURSECS;
  51          $DB->delete_records_select('quiz_statistics', 'timemodified < ?', array($expiretime));
  52  
  53          return true;
  54      }
  55  }