diff options
author | Pierre Schmitz <pierre@archlinux.de> | 2008-08-15 01:29:47 +0200 |
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committer | Pierre Schmitz <pierre@archlinux.de> | 2008-08-15 01:29:47 +0200 |
commit | 370e83bb0dfd0c70de268c93bf07ad5ee0897192 (patch) | |
tree | 491674f4c242e4d6ba0d04eafa305174c35a3391 /includes/parser/ParserCache.php | |
parent | f4debf0f12d0524d2b2427c55ea3f16b680fad97 (diff) |
Update auf 1.13.0
Diffstat (limited to 'includes/parser/ParserCache.php')
-rw-r--r-- | includes/parser/ParserCache.php | 116 |
1 files changed, 116 insertions, 0 deletions
diff --git a/includes/parser/ParserCache.php b/includes/parser/ParserCache.php new file mode 100644 index 00000000..bf11da2e --- /dev/null +++ b/includes/parser/ParserCache.php @@ -0,0 +1,116 @@ +<?php +/** + * @ingroup Cache Parser + * @todo document + */ +class ParserCache { + /** + * Get an instance of this object + */ + public static function &singleton() { + static $instance; + if ( !isset( $instance ) ) { + global $parserMemc; + $instance = new ParserCache( $parserMemc ); + } + return $instance; + } + + /** + * Setup a cache pathway with a given back-end storage mechanism. + * May be a memcached client or a BagOStuff derivative. + * + * @param object $memCached + */ + function __construct( &$memCached ) { + $this->mMemc =& $memCached; + } + + function getKey( &$article, &$user ) { + global $action; + $hash = $user->getPageRenderingHash(); + if( !$article->mTitle->quickUserCan( 'edit' ) ) { + // section edit links are suppressed even if the user has them on + $edit = '!edit=0'; + } else { + $edit = ''; + } + $pageid = intval( $article->getID() ); + $renderkey = (int)($action == 'render'); + $key = wfMemcKey( 'pcache', 'idhash', "$pageid-$renderkey!$hash$edit" ); + return $key; + } + + function getETag( &$article, &$user ) { + return 'W/"' . $this->getKey($article, $user) . "--" . $article->mTouched. '"'; + } + + function get( &$article, &$user ) { + global $wgCacheEpoch; + $fname = 'ParserCache::get'; + wfProfileIn( $fname ); + + $key = $this->getKey( $article, $user ); + + wfDebug( "Trying parser cache $key\n" ); + $value = $this->mMemc->get( $key ); + if ( is_object( $value ) ) { + wfDebug( "Found.\n" ); + # Delete if article has changed since the cache was made + $canCache = $article->checkTouched(); + $cacheTime = $value->getCacheTime(); + $touched = $article->mTouched; + if ( !$canCache || $value->expired( $touched ) ) { + if ( !$canCache ) { + wfIncrStats( "pcache_miss_invalid" ); + wfDebug( "Invalid cached redirect, touched $touched, epoch $wgCacheEpoch, cached $cacheTime\n" ); + } else { + wfIncrStats( "pcache_miss_expired" ); + wfDebug( "Key expired, touched $touched, epoch $wgCacheEpoch, cached $cacheTime\n" ); + } + $this->mMemc->delete( $key ); + $value = false; + } else { + if ( isset( $value->mTimestamp ) ) { + $article->mTimestamp = $value->mTimestamp; + } + wfIncrStats( "pcache_hit" ); + } + } else { + wfDebug( "Parser cache miss.\n" ); + wfIncrStats( "pcache_miss_absent" ); + $value = false; + } + + wfProfileOut( $fname ); + return $value; + } + + function save( $parserOutput, &$article, &$user ){ + global $wgParserCacheExpireTime; + $key = $this->getKey( $article, $user ); + + if( $parserOutput->getCacheTime() != -1 ) { + + $now = wfTimestampNow(); + $parserOutput->setCacheTime( $now ); + + // Save the timestamp so that we don't have to load the revision row on view + $parserOutput->mTimestamp = $article->getTimestamp(); + + $parserOutput->mText .= "\n<!-- Saved in parser cache with key $key and timestamp $now -->\n"; + wfDebug( "Saved in parser cache with key $key and timestamp $now\n" ); + + if( $parserOutput->containsOldMagic() ){ + $expire = 3600; # 1 hour + } else { + $expire = $wgParserCacheExpireTime; + } + $this->mMemc->set( $key, $parserOutput, $expire ); + + } else { + wfDebug( "Parser output was marked as uncacheable and has not been saved.\n" ); + } + } + +} |