34e6fe188a
In the presence of DBO_TRX, commit() may be used like a "flush". Added a flag to trigger this mode to commit() and changed DeferredUpdates to used the flush mode. Change-Id: I529117618194a2669535f3c5c0fed07588597299
119 lines
3.2 KiB
PHP
119 lines
3.2 KiB
PHP
<?php
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/**
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* Interface and manager for deferred updates.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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* http://www.gnu.org/copyleft/gpl.html
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*
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* @file
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*/
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/**
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* Interface that deferrable updates should implement. Basically required so we
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* can validate input on DeferredUpdates::addUpdate()
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*
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* @since 1.19
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*/
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interface DeferrableUpdate {
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/**
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* Perform the actual work
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*/
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function doUpdate();
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}
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/**
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* Class for mananging the deferred updates.
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*
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* @since 1.19
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*/
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class DeferredUpdates {
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/**
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* Store of updates to be deferred until the end of the request.
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*/
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private static $updates = array();
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/**
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* Add an update to the deferred list
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* @param $update DeferrableUpdate Some object that implements doUpdate()
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*/
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public static function addUpdate( DeferrableUpdate $update ) {
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array_push( self::$updates, $update );
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}
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/**
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* HTMLCacheUpdates are the most common deferred update people use. This
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* is a shortcut method for that.
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* @see HTMLCacheUpdate::__construct()
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* @param $title
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* @param $table
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*/
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public static function addHTMLCacheUpdate( $title, $table ) {
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self::addUpdate( new HTMLCacheUpdate( $title, $table ) );
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}
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/**
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* Do any deferred updates and clear the list
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*
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* @param $commit String: set to 'commit' to commit after every update to
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* prevent lock contention
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*/
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public static function doUpdates( $commit = '' ) {
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global $wgDeferredUpdateList;
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wfProfileIn( __METHOD__ );
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$updates = array_merge( $wgDeferredUpdateList, self::$updates );
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// No need to get master connections in case of empty updates array
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if ( !count( $updates ) ) {
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wfProfileOut( __METHOD__ );
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return;
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}
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$doCommit = $commit == 'commit';
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if ( $doCommit ) {
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$dbw = wfGetDB( DB_MASTER );
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}
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foreach ( $updates as $update ) {
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try {
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$update->doUpdate();
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if ( $doCommit && $dbw->trxLevel() ) {
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$dbw->commit( __METHOD__, 'flush' );
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}
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} catch ( MWException $e ) {
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// We don't want exceptions thrown during deferred updates to
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// be reported to the user since the output is already sent.
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// Instead we just log them.
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if ( !$e instanceof ErrorPageError ) {
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wfDebugLog( 'exception', $e->getLogMessage() );
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}
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}
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}
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self::clearPendingUpdates();
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wfProfileOut( __METHOD__ );
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}
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/**
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* Clear all pending updates without performing them. Generally, you don't
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* want or need to call this. Unit tests need it though.
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*/
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public static function clearPendingUpdates() {
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global $wgDeferredUpdateList;
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$wgDeferredUpdateList = self::$updates = array();
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}
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}
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