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<?php /** * This program 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 2 of the License, or * (at your option) any later version. * * This program 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 this program; if not, write to the Free Software Foundation, Inc., * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. * http://www.gnu.org/copyleft/gpl.html * * @file * @ingroup Cache */ namespace MediaWiki\Cache; use LogicException; use MediaWiki\Linker\LinkTarget; use MediaWiki\Page\PageReference; /** * Helper class for mapping value objects representing basic entities to cache keys. * * Rationale: * The logic for deriving the cache key should not be in the value object themselves for two reasons: * Firstly, the value object should not contain knowledge about caching or keys in general. * Secondly, all implementations of a given interface must have the exact same logic for deriving * the cache key. Otherwise, caches will break when different implementations are used when * interacting with a cache. * * Furthermore, the logic for deriving cache keys should not be in a service instance: there can * only ever be one implementation, it must not depend on configuration, and it should never change. * * @ingroup Cache */ abstract class CacheKeyHelper { /** * Private constructor to defy instantiation. * @return never */ private function __construct() { // we should never even get here... throw new LogicException( 'Should not instantiate ' . __CLASS__ ); } /** * @param LinkTarget|PageReference $page * * @return string */ public static function getKeyForPage( $page ): string { return 'ns' . $page->getNamespace() . ':' . $page->getDBkey(); } }
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