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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 * Cache data source for the assign overrides. 19 * 20 * @package mod_assign 21 * @copyright 2021 Shamim Rezaie <shamim@moodle.com> 22 * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later 23 */ 24 25 declare(strict_types=1); 26 27 namespace mod_assign\cache; 28 29 use cache_definition; 30 31 /** 32 * Class assign_overrides 33 * 34 * @package mod_assign 35 * @copyright 2021 Shamim Rezaie <shamim@moodle.com> 36 * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later 37 */ 38 class overrides implements \cache_data_source { 39 40 /** @var overrides the singleton instance of this class. */ 41 protected static $instance = null; 42 43 /** 44 * Returns an instance of the data source class that the cache can use for loading data using the other methods 45 * specified by this interface. 46 * 47 * @param cache_definition $definition 48 * @return object 49 */ 50 public static function get_instance_for_cache(cache_definition $definition): overrides { 51 if (is_null(self::$instance)) { 52 self::$instance = new overrides(); 53 } 54 return self::$instance; 55 } 56 57 /** 58 * Loads the data for the key provided ready formatted for caching. 59 * 60 * @param string|int $key The key to load. 61 * @return mixed What ever data should be returned, or false if it can't be loaded. 62 * @throws \coding_exception 63 */ 64 public function load_for_cache($key) { 65 global $DB; 66 67 [$assignid, $ug, $ugid] = explode('_', $key); 68 $assignid = (int) $assignid; 69 70 switch ($ug) { 71 case 'u': 72 $userid = (int) $ugid; 73 $override = $DB->get_record( 74 'assign_overrides', 75 ['assignid' => $assignid, 'userid' => $userid], 76 'duedate, cutoffdate, allowsubmissionsfromdate' 77 ); 78 break; 79 case 'g': 80 $groupid = (int) $ugid; 81 $override = $DB->get_record( 82 'assign_overrides', 83 ['assignid' => $assignid, 'groupid' => $groupid], 84 'sortorder, duedate, cutoffdate, allowsubmissionsfromdate' 85 ); 86 break; 87 default: 88 throw new \coding_exception('Invalid cache key'); 89 } 90 91 // Return null instead of false, because false will not be cached. 92 return $override ?: null; 93 } 94 95 /** 96 * Loads several keys for the cache. 97 * 98 * @param array $keys An array of keys each of which will be string|int. 99 * @return array An array of matching data items. 100 */ 101 public function load_many_for_cache(array $keys) { 102 $results = []; 103 104 foreach ($keys as $key) { 105 $results[] = $this->load_for_cache($key); 106 } 107 108 return $results; 109 } 110 }
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