127 lines
3.2 KiB
PHP
127 lines
3.2 KiB
PHP
<?php
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/**
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*
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* @package MediaWiki
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* @subpackage Cache
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*/
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/**
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*
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* @package MediaWiki
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*/
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class ParserCache {
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/**
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* Get an instance of this object
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*/
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function &singleton() {
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static $instance;
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if ( !isset( $instance ) ) {
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global $parserMemc;
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$instance = new ParserCache( $parserMemc );
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}
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return $instance;
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}
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/**
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* Setup a cache pathway with a given back-end storage mechanism.
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* May be a memcached client or a BagOStuff derivative.
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*
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* @param object $memCached
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*/
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function ParserCache( &$memCached ) {
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$this->mMemc =& $memCached;
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}
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function getKey( &$article, &$user ) {
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global $wgDBname, $action;
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$hash = $user->getPageRenderingHash();
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if( !$article->mTitle->userCanEdit() ) {
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// section edit links are suppressed even if the user has them on
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$edit = '!edit=0';
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} else {
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$edit = '';
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}
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$pageid = intval( $article->getID() );
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$renderkey = (int)($action == 'render');
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$key = "$wgDBname:pcache:idhash:$pageid-$renderkey!$hash$edit";
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return $key;
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}
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function getETag( &$article, &$user ) {
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return 'W/"' . $this->getKey($article, $user) . "--" . $article->mTouched. '"';
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}
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function get( &$article, &$user ) {
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global $wgCacheEpoch;
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$fname = 'ParserCache::get';
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wfProfileIn( $fname );
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$hash = $user->getPageRenderingHash();
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$pageid = intval( $article->getID() );
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$key = $this->getKey( $article, $user );
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wfDebug( "Trying parser cache $key\n" );
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$value = $this->mMemc->get( $key );
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if ( is_object( $value ) ) {
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wfDebug( "Found.\n" );
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# Delete if article has changed since the cache was made
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$canCache = $article->checkTouched();
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$cacheTime = $value->getCacheTime();
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$touched = $article->mTouched;
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if ( !$canCache || $value->expired( $touched ) ) {
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if ( !$canCache ) {
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wfIncrStats( "pcache_miss_invalid" );
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wfDebug( "Invalid cached redirect, touched $touched, epoch $wgCacheEpoch, cached $cacheTime\n" );
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} else {
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wfIncrStats( "pcache_miss_expired" );
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wfDebug( "Key expired, touched $touched, epoch $wgCacheEpoch, cached $cacheTime\n" );
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}
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$this->mMemc->delete( $key );
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$value = false;
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} else {
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if ( isset( $value->mTimestamp ) ) {
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$article->mTimestamp = $value->mTimestamp;
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}
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wfIncrStats( "pcache_hit" );
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}
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} else {
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wfDebug( "Parser cache miss.\n" );
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wfIncrStats( "pcache_miss_absent" );
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$value = false;
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}
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wfProfileOut( $fname );
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return $value;
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}
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function save( $parserOutput, &$article, &$user ){
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global $wgParserCacheExpireTime;
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$key = $this->getKey( $article, $user );
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if( $parserOutput->getCacheTime() != -1 ) {
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$now = wfTimestampNow();
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$parserOutput->setCacheTime( $now );
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// Save the timestamp so that we don't have to load the revision row on view
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$parserOutput->mTimestamp = $article->getTimestamp();
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$parserOutput->mText .= "\n<!-- Saved in parser cache with key $key and timestamp $now -->\n";
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wfDebug( "Saved in parser cache with key $key and timestamp $now\n" );
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if( $parserOutput->containsOldMagic() ){
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$expire = 3600; # 1 hour
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} else {
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$expire = $wgParserCacheExpireTime;
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}
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$this->mMemc->set( $key, $parserOutput, $expire );
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} else {
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wfDebug( "Parser output was marked as uncacheable and has not been saved.\n" );
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}
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}
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}
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?>
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