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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 );
}
}
}