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<?php
/**
* Job to update links for a given title.
*
* 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
* @ingroup JobQueue
*/
/**
* Background job to update links for a given title.
*
* @ingroup JobQueue
*/
class RefreshLinksJob extends Job {
function __construct( $title, $params = '', $id = 0 ) {
parent::__construct( 'refreshLinks', $title, $params, $id );
}
/**
* Run a refreshLinks job
* @return boolean success
*/
function run() {
wfProfileIn( __METHOD__ );
$linkCache = LinkCache::singleton();
$linkCache->clear();
if ( is_null( $this->title ) ) {
$this->error = "refreshLinks: Invalid title";
wfProfileOut( __METHOD__ );
return false;
}
# Wait for the DB of the current/next slave DB handle to catch up to the master.
# This way, we get the correct page_latest for templates or files that just changed
# milliseconds ago, having triggered this job to begin with.
if ( isset( $this->params['masterPos'] ) ) {
wfGetLB()->waitFor( $this->params['masterPos'] );
}
$revision = Revision::newFromTitle( $this->title, false, Revision::READ_NORMAL );
if ( !$revision ) {
$this->error = 'refreshLinks: Article not found "' .
$this->title->getPrefixedDBkey() . '"';
wfProfileOut( __METHOD__ );
return false; // XXX: what if it was just deleted?
}
self::runForTitleInternal( $this->title, $revision, __METHOD__ );
wfProfileOut( __METHOD__ );
return true;
}
public static function runForTitleInternal( Title $title, Revision $revision, $fname ) {
global $wgParser, $wgContLang;
wfProfileIn( $fname . '-parse' );
$options = ParserOptions::newFromUserAndLang( new User, $wgContLang );
$parserOutput = $wgParser->parse(
$revision->getText(), $title, $options, true, true, $revision->getId() );
wfProfileOut( $fname . '-parse' );
wfProfileIn( $fname . '-update' );
$updates = $parserOutput->getSecondaryDataUpdates( $title, false );
DataUpdate::runUpdates( $updates );
wfProfileOut( $fname . '-update' );
}
}
/**
* Background job to update links for a given title.
* Newer version for high use templates.
*
* @ingroup JobQueue
*/
class RefreshLinksJob2 extends Job {
const MAX_TITLES_RUN = 10;
function __construct( $title, $params, $id = 0 ) {
parent::__construct( 'refreshLinks2', $title, $params, $id );
}
/**
* Run a refreshLinks2 job
* @return boolean success
*/
function run() {
wfProfileIn( __METHOD__ );
$linkCache = LinkCache::singleton();
$linkCache->clear();
if ( is_null( $this->title ) ) {
$this->error = "refreshLinks2: Invalid title";
wfProfileOut( __METHOD__ );
return false;
} elseif ( !isset( $this->params['start'] ) || !isset( $this->params['end'] ) ) {
$this->error = "refreshLinks2: Invalid params";
wfProfileOut( __METHOD__ );
return false;
}
// Back compat for pre-r94435 jobs
$table = isset( $this->params['table'] ) ? $this->params['table'] : 'templatelinks';
// Avoid slave lag when fetching templates
if ( isset( $this->params['masterPos'] ) ) {
$masterPos = $this->params['masterPos'];
} elseif ( wfGetLB()->getServerCount() > 1 ) {
$masterPos = wfGetLB()->getMasterPos();
} else {
$masterPos = false;
}
$titles = $this->title->getBacklinkCache()->getLinks(
$table, $this->params['start'], $this->params['end'] );
if ( $titles->count() > self::MAX_TITLES_RUN ) {
# We don't want to parse too many pages per job as it can starve other jobs.
# If there are too many pages to parse, break this up into smaller jobs. By passing
# in the master position here we can cut down on the time spent waiting for slaves to
# catch up by the runners handling these jobs since time will have passed between now
# and when they pop these jobs off the queue.
$start = 0; // batch start
$end = 0; // batch end
$bsize = 0; // batch size
$first = true; // first of batch
$jobs = array();
foreach ( $titles as $title ) {
$start = $first ? $title->getArticleId() : $start;
$end = $title->getArticleId();
$first = false;
if ( ++$bsize >= self::MAX_TITLES_RUN ) {
$jobs[] = new RefreshLinksJob2( $this->title, array(
'table' => $table,
'start' => $start,
'end' => $end,
'masterPos' => $masterPos
) );
$first = true;
$start = $end = $bsize = 0;
}
}
if ( $bsize > 0 ) { // group remaining pages into a job
$jobs[] = new RefreshLinksJob2( $this->title, array(
'table' => $table,
'start' => $start,
'end' => $end,
'masterPos' => $masterPos
) );
}
Job::batchInsert( $jobs );
} elseif ( php_sapi_name() != 'cli' ) {
# Not suitable for page load triggered job running!
# Gracefully switch to refreshLinks jobs if this happens.
$jobs = array();
foreach ( $titles as $title ) {
$jobs[] = new RefreshLinksJob( $title, array( 'masterPos' => $masterPos ) );
}
Job::batchInsert( $jobs );
} else {
# Wait for the DB of the current/next slave DB handle to catch up to the master.
# This way, we get the correct page_latest for templates or files that just changed
# milliseconds ago, having triggered this job to begin with.
if ( $masterPos ) {
wfGetLB()->waitFor( $masterPos );
}
# Re-parse each page that transcludes this page and update their tracking links...
foreach ( $titles as $title ) {
$revision = Revision::newFromTitle( $title, false, Revision::READ_NORMAL );
if ( !$revision ) {
$this->error = 'refreshLinks: Article not found "' .
$title->getPrefixedDBkey() . '"';
continue; // skip this page
}
RefreshLinksJob::runForTitleInternal( $title, $revision, __METHOD__ );
wfWaitForSlaves();
}
}
wfProfileOut( __METHOD__ );
return true;
}
}
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