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<?php // This file is part of Moodle - http://moodle.org/ // // Moodle is free software: you can redistribute it and/or modify // it under the terms of the GNU General Public License as published by // the Free Software Foundation, either version 3 of the License, or // (at your option) any later version. // // Moodle is distributed in the hope that it will be useful, // but WITHOUT ANY WARRANTY; without even the implied warranty of // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the // GNU General Public License for more details. // // You should have received a copy of the GNU General Public License // along with Moodle. If not, see <http://www.gnu.org/licenses/>. namespace core_cache; /** * Create and keep an instance of this class to allow temporary caches when caches are disabled. * * This class works together with code in {@see cache_factory_disabled}. * * The intention is that temporary cache should be short-lived (not for the entire install process), * which avoids two problems: first, that we might run out of memory for the caches, and second, * that some code e.g. install.php/upgrade.php files, is entitled to assume that caching is not * used and make direct database changes. * * @package core_cache * @copyright 2022 The Open University * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later / class allow_temporary_caches { /* @var int Number of references of this class; if more than 0, temporary caches are allowed / protected static $references = 0; /* * Constructs an instance of this class. * * Temporary caches will be allowed until this instance goes out of scope. Store this token * in a local variable, so that the caches have a limited life; do not save it outside your * function. * * If cache is not disabled then normal (non-temporary) caches will be used, and this class * does nothing. * * If an object of this class already exists then creating (or destroying) another one will * have no effect. / public function __construct() { self::$references++; } /* * Destroys an instance of this class. * * You do not need to call this manually; PHP will call it automatically when your variable * goes out of scope. If you do need to remove your token at other times, use unset($token); * * If there are no other instances of this object, then all temporary caches will be discarded. / public function __destruct() { global $CFG; require_once($CFG->dirroot . '/cache/disabledlib.php'); self::$references--; if (self::$references === 0) { \cache_factory_disabled::clear_temporary_caches(); } } /* * Checks if temp caches are currently allowed. * * @return bool True if allowed */ public static function is_allowed(): bool { return self::$references > 0; } }

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