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-rw-r--r--includes/job/aggregator/JobQueueAggregatorMemc.php124
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diff --git a/includes/job/aggregator/JobQueueAggregatorMemc.php b/includes/job/aggregator/JobQueueAggregatorMemc.php
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--- a/includes/job/aggregator/JobQueueAggregatorMemc.php
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-<?php
-/**
- * Job queue aggregator code that uses BagOStuff.
- *
- * 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
- * @author Aaron Schulz
- */
-
-/**
- * Class to handle tracking information about all queues using BagOStuff
- *
- * @ingroup JobQueue
- * @since 1.21
- */
-class JobQueueAggregatorMemc extends JobQueueAggregator {
- /** @var BagOStuff */
- protected $cache;
-
- protected $cacheTTL; // integer; seconds
-
- /**
- * @params include:
- * - objectCache : Name of an object cache registered in $wgObjectCaches.
- * This defaults to the one specified by $wgMainCacheType.
- * - cacheTTL : Seconds to cache the aggregate data before regenerating.
- * @param array $params
- */
- protected function __construct( array $params ) {
- parent::__construct( $params );
- $this->cache = isset( $params['objectCache'] )
- ? wfGetCache( $params['objectCache'] )
- : wfGetMainCache();
- $this->cacheTTL = isset( $params['cacheTTL'] ) ? $params['cacheTTL'] : 180; // 3 min
- }
-
- /**
- * @see JobQueueAggregator::doNotifyQueueEmpty()
- */
- protected function doNotifyQueueEmpty( $wiki, $type ) {
- $key = $this->getReadyQueueCacheKey();
- // Delist the queue from the "ready queue" list
- if ( $this->cache->add( "$key:lock", 1, 60 ) ) { // lock
- $curInfo = $this->cache->get( $key );
- if ( is_array( $curInfo ) && isset( $curInfo['pendingDBs'][$type] ) ) {
- if ( in_array( $wiki, $curInfo['pendingDBs'][$type] ) ) {
- $curInfo['pendingDBs'][$type] = array_diff(
- $curInfo['pendingDBs'][$type], array( $wiki ) );
- $this->cache->set( $key, $curInfo );
- }
- }
- $this->cache->delete( "$key:lock" ); // unlock
- }
- return true;
- }
-
- /**
- * @see JobQueueAggregator::doNotifyQueueNonEmpty()
- */
- protected function doNotifyQueueNonEmpty( $wiki, $type ) {
- return true; // updated periodically
- }
-
- /**
- * @see JobQueueAggregator::doAllGetReadyWikiQueues()
- */
- protected function doGetAllReadyWikiQueues() {
- $key = $this->getReadyQueueCacheKey();
- // If the cache entry wasn't present, is stale, or in .1% of cases otherwise,
- // regenerate the cache. Use any available stale cache if another process is
- // currently regenerating the pending DB information.
- $pendingDbInfo = $this->cache->get( $key );
- if ( !is_array( $pendingDbInfo )
- || ( time() - $pendingDbInfo['timestamp'] ) > $this->cacheTTL
- || mt_rand( 0, 999 ) == 0
- ) {
- if ( $this->cache->add( "$key:rebuild", 1, 1800 ) ) { // lock
- $pendingDbInfo = array(
- 'pendingDBs' => $this->findPendingWikiQueues(),
- 'timestamp' => time()
- );
- for ( $attempts = 1; $attempts <= 25; ++$attempts ) {
- if ( $this->cache->add( "$key:lock", 1, 60 ) ) { // lock
- $this->cache->set( $key, $pendingDbInfo );
- $this->cache->delete( "$key:lock" ); // unlock
- break;
- }
- }
- $this->cache->delete( "$key:rebuild" ); // unlock
- }
- }
- return is_array( $pendingDbInfo )
- ? $pendingDbInfo['pendingDBs']
- : array(); // cache is both empty and locked
- }
-
- /**
- * @see JobQueueAggregator::doPurge()
- */
- protected function doPurge() {
- return $this->cache->delete( $this->getReadyQueueCacheKey() );
- }
-
- /**
- * @return string
- */
- private function getReadyQueueCacheKey() {
- return "jobqueue:aggregator:ready-queues:v1"; // global
- }
-}