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. /** * Cache data source for the lesson overrides. * * @package mod_lesson * @copyright 2021 Shamim Rezaie * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later */ declare(strict_types=1); namespace mod_lesson\cache; use cache_definition; /** * Class lesson_overrides * * @package mod_lesson * @copyright 2021 Shamim Rezaie * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later */ class overrides implements \cache_data_source { /** @var overrides the singleton instance of this class. */ protected static $instance = null; /** * Returns an instance of the data source class that the cache can use for loading data using the other methods * specified by this interface. * * @param cache_definition $definition * @return object */ public static function get_instance_for_cache(cache_definition $definition): overrides { if (is_null(self::$instance)) { self::$instance = new overrides(); } return self::$instance; } /** * Loads the data for the key provided ready formatted for caching. * * @param string|int $key The key to load. * @return mixed What ever data should be returned, or false if it can't be loaded. * @throws \coding_exception */ public function load_for_cache($key) { global $DB; [$lessonid, $ug, $ugid] = explode('_', $key); $lessonid = (int) $lessonid; switch ($ug) { case 'u': $userid = (int) $ugid; $override = $DB->get_record( 'lesson_overrides', ['lessonid' => $lessonid, 'userid' => $userid], 'available, deadline, timelimit, review, maxattempts, retake, password' ); break; case 'g': $groupid = (int) $ugid; $override = $DB->get_record( 'lesson_overrides', ['lessonid' => $lessonid, 'groupid' => $groupid], 'available, deadline, timelimit, review, maxattempts, retake, password' ); break; default: throw new \coding_exception('Invalid cache key'); } // Return null instead of false, because false will not be cached. return $override ?: null; } /** * Loads several keys for the cache. * * @param array $keys An array of keys each of which will be string|int. * @return array An array of matching data items. */ public function load_many_for_cache(array $keys) { $results = []; foreach ($keys as $key) { $results[] = $this->load_for_cache($key); } return $results; } }