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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 titles in certain backlink range by page ID.
* Newer version for high use templates. This is deprecated by RefreshLinksPartitionJob.
*
* @ingroup JobQueue
* @deprecated since 1.23
*/
class RefreshLinksJob2 extends Job {
function __construct( $title, $params ) {
parent::__construct( 'refreshLinks2', $title, $params );
// Base jobs for large templates can easily be de-duplicated
$this->removeDuplicates = !isset( $params['start'] ) && !isset( $params['end'] );
}
/**
* Run a refreshLinks2 job
* @return bool Success
*/
function run() {
global $wgUpdateRowsPerJob;
$linkCache = LinkCache::singleton();
$linkCache->clear();
if ( is_null( $this->title ) ) {
$this->error = "refreshLinks2: Invalid title";
return false;
}
// Back compat for pre-r94435 jobs
$table = isset( $this->params['table'] ) ? $this->params['table'] : 'templatelinks';
// Avoid slave lag when fetching templates.
// When the outermost job is run, we know that the caller that enqueued it must have
// committed the relevant changes to the DB by now. At that point, record the master
// position and pass it along as the job recursively breaks into smaller range jobs.
// Hopefully, when leaf jobs are popped, the slaves will have reached that position.
if ( isset( $this->params['masterPos'] ) ) {
$masterPos = $this->params['masterPos'];
} elseif ( wfGetLB()->getServerCount() > 1 ) {
$masterPos = wfGetLB()->getMasterPos();
} else {
$masterPos = false;
}
$tbc = $this->title->getBacklinkCache();
$jobs = array(); // jobs to insert
if ( isset( $this->params['start'] ) && isset( $this->params['end'] ) ) {
# This is a partition job to trigger the insertion of leaf jobs...
$jobs = array_merge( $jobs, $this->getSingleTitleJobs( $table, $masterPos ) );
} else {
# This is a base job to trigger the insertion of partitioned jobs...
if ( $tbc->getNumLinks( $table, $wgUpdateRowsPerJob + 1 ) <= $wgUpdateRowsPerJob ) {
# Just directly insert the single per-title jobs
$jobs = array_merge( $jobs, $this->getSingleTitleJobs( $table, $masterPos ) );
} else {
# Insert the partition jobs to make per-title jobs
foreach ( $tbc->partition( $table, $wgUpdateRowsPerJob ) as $batch ) {
list( $start, $end ) = $batch;
$jobs[] = new RefreshLinksJob2( $this->title,
array(
'table' => $table,
'start' => $start,
'end' => $end,
'masterPos' => $masterPos,
) + $this->getRootJobParams() // carry over information for de-duplication
);
}
}
}
if ( count( $jobs ) ) {
JobQueueGroup::singleton()->push( $jobs );
}
return true;
}
/**
* @param string $table
* @param mixed $masterPos
* @return array
*/
protected function getSingleTitleJobs( $table, $masterPos ) {
# The "start"/"end" fields are not set for the base jobs
$start = isset( $this->params['start'] ) ? $this->params['start'] : false;
$end = isset( $this->params['end'] ) ? $this->params['end'] : false;
$titles = $this->title->getBacklinkCache()->getLinks( $table, $start, $end );
# Convert into single page refresh links jobs.
# This handles well when in sapi mode and is useful in any case for job
# de-duplication. If many pages use template A, and that template itself
# uses template B, then an edit to both will create many duplicate jobs.
# Roughly speaking, for each page, one of the "RefreshLinksJob" jobs will
# get run first, and when it does, it will remove the duplicates. Of course,
# one page could have its job popped when the other page's job is still
# buried within the logic of a refreshLinks2 job.
$jobs = array();
foreach ( $titles as $title ) {
$jobs[] = new RefreshLinksJob( $title,
array( 'masterPos' => $masterPos ) + $this->getRootJobParams()
); // carry over information for de-duplication
}
return $jobs;
}
/**
* @return array
*/
public function getDeduplicationInfo() {
$info = parent::getDeduplicationInfo();
// Don't let highly unique "masterPos" values ruin duplicate detection
if ( is_array( $info['params'] ) ) {
unset( $info['params']['masterPos'] );
}
return $info;
}
}
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