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<?php
/**
* Base code for update jobs that put some secondary data extracted
* from article content into the database.
*
* 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
*/
use Wikimedia\Rdbms\IDatabase;
use MediaWiki\MediaWikiServices;
class PurgeJobUtils {
/**
* Invalidate the cache of a list of pages from a single namespace.
* This is intended for use by subclasses.
*
* @param IDatabase $dbw
* @param int $namespace Namespace number
* @param array $dbkeys
*/
public static function invalidatePages( IDatabase $dbw, $namespace, array $dbkeys ) {
if ( $dbkeys === [] ) {
return;
}
$dbw->onTransactionIdle(
function () use ( $dbw, $namespace, $dbkeys ) {
$services = MediaWikiServices::getInstance();
$lbFactory = $services->getDBLoadBalancerFactory();
// Determine which pages need to be updated.
// This is necessary to prevent the job queue from smashing the DB with
// large numbers of concurrent invalidations of the same page.
$now = $dbw->timestamp();
$ids = $dbw->selectFieldValues(
'page',
'page_id',
[
'page_namespace' => $namespace,
'page_title' => $dbkeys,
'page_touched < ' . $dbw->addQuotes( $now )
],
__METHOD__
);
if ( !$ids ) {
return;
}
$batchSize = $services->getMainConfig()->get( 'UpdateRowsPerQuery' );
$ticket = $lbFactory->getEmptyTransactionTicket( __METHOD__ );
foreach ( array_chunk( $ids, $batchSize ) as $idBatch ) {
$dbw->update(
'page',
[ 'page_touched' => $now ],
[
'page_id' => $idBatch,
'page_touched < ' . $dbw->addQuotes( $now ) // handle races
],
__METHOD__
);
$lbFactory->commitAndWaitForReplication( __METHOD__, $ticket );
}
},
__METHOD__
);
}
}
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