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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
*/
use MediaWiki\Deferred\AutoCommitUpdate;
use MediaWiki\Deferred\DeferredUpdates;
use MediaWiki\MainConfigNames;
use MediaWiki\MediaWikiServices;
use Wikimedia\Rdbms\IDatabase;
/**
* Helper for a Job that writes data derived from page content to the database.
*
* Used by RefreshLinksJob via LinksUpdate.
*
* @ingroup JobQueue
*/
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 string[] $dbkeys
*/
public static function invalidatePages( IDatabase $dbw, $namespace, array $dbkeys ) {
if ( $dbkeys === [] ) {
return;
}
$fname = __METHOD__;
DeferredUpdates::addUpdate( new AutoCommitUpdate(
$dbw,
__METHOD__,
static function () use ( $dbw, $namespace, $dbkeys, $fname ) {
$services = MediaWikiServices::getInstance();
$dbProvider = $services->getConnectionProvider();
// 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->newSelectQueryBuilder()
->select( 'page_id' )
->from( 'page' )
->where( [ 'page_namespace' => $namespace ] )
->andWhere( [ 'page_title' => $dbkeys ] )
->andWhere( $dbw->expr( 'page_touched', '<', $now ) )
->caller( $fname )->fetchFieldValues();
if ( !$ids ) {
return;
}
$batchSize =
$services->getMainConfig()->get( MainConfigNames::UpdateRowsPerQuery );
$ticket = $dbProvider->getEmptyTransactionTicket( $fname );
$idBatches = array_chunk( $ids, $batchSize );
foreach ( $idBatches as $idBatch ) {
$dbw->newUpdateQueryBuilder()
->update( 'page' )
->set( [ 'page_touched' => $now ] )
->where( [ 'page_id' => $idBatch ] )
->andWhere( $dbw->expr( 'page_touched', '<', $now ) ) // handle races
->caller( $fname )->execute();
if ( count( $idBatches ) > 1 ) {
$dbProvider->commitAndWaitForReplication( $fname, $ticket );
}
}
}
) );
}
}
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