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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 */ /** * LocalisationCache optimised for loading many languages at once. * * Used by maintenance/rebuildLocalisationCache.php. * * @ingroup Language */ class LocalisationCacheBulkLoad extends LocalisationCache { /** * A cache for the contents of the data files. * Core files are serialized to avoid using ~1GB of RAM during a re-cache. * @var string[][] */ private $fileCache = []; /** * Most recently used languages. Uses the linked-list aspect of PHP hashtables * to keep the most recently used language codes at the end of the array, and * the language codes that are ready to be deleted at the beginning. * @var array<string,true> */ private $mruLangs = []; /** * Maximum number of languages that may be loaded into $this->data * @var int */ private $maxLoadedLangs = 10; /** * @param string $fileName * @param string $fileType * @return array|mixed */ protected function readPHPFile( $fileName, $fileType ) { $serialize = $fileType === 'core'; if ( !isset( $this->fileCache[$fileName][$fileType] ) ) { $data = parent::readPHPFile( $fileName, $fileType ); if ( $serialize ) { $encData = serialize( $data ); } else { $encData = $data; } $this->fileCache[$fileName][$fileType] = $encData; return $data; } elseif ( $serialize ) { return unserialize( $this->fileCache[$fileName][$fileType] ); } else { return $this->fileCache[$fileName][$fileType]; } } /** * @param string $code * @param string $key * @return mixed */ public function getItem( $code, $key ) { unset( $this->mruLangs[$code] ); $this->mruLangs[$code] = true; return parent::getItem( $code, $key ); } /** * @param string $code * @param string $key * @param string $subkey * @return mixed */ public function getSubitem( $code, $key, $subkey ) { unset( $this->mruLangs[$code] ); $this->mruLangs[$code] = true; return parent::getSubitem( $code, $key, $subkey ); } /** * @param string $code */ public function recache( $code ) { parent::recache( $code ); unset( $this->mruLangs[$code] ); $this->mruLangs[$code] = true; $this->trimCache(); } /** * @param string $code */ public function unload( $code ) { unset( $this->mruLangs[$code] ); parent::unload( $code ); } /** * Unload cached languages until there are less than $this->maxLoadedLangs */ protected function trimCache() { while ( count( $this->data ) > $this->maxLoadedLangs && count( $this->mruLangs ) ) { $code = array_key_first( $this->mruLangs ); wfDebug( __METHOD__ . ": unloading $code" ); $this->unload( $code ); } } }
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