+<?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
+ */
+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->onTransactionPreCommitOrIdle( function() use ( $dbw, $namespace, $dbkeys ) {
+ // 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;
+ }
+
+ // Do the update.
+ // We still need the page_touched condition, in case the row has changed since
+ // the non-locking select above.
+ $dbw->update(
+ 'page',
+ [ 'page_touched' => $now ],
+ [
+ 'page_id' => $ids,
+ 'page_touched < ' . $dbw->addQuotes( $now )
+ ],
+ __METHOD__
+ );
+ } );
+ }
+}