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