<?php
+/**
+ *
+ * @package MediaWiki
+ * @subpackage Cache
+ */
+
+/**
+ *
+ * @package MediaWiki
+ */
+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 $memCached
+ */
+ function ParserCache( &$memCached ) {
+ $this->mMemc =& $memCached;
+ }
-class ParserCache
-{
function getKey( &$article, &$user ) {
- global $wgDBname;
+ global $action;
$hash = $user->getPageRenderingHash();
+ if( !$article->mTitle->userCanEdit() ) {
+ // section edit links are suppressed even if the user has them on
+ $edit = '!edit=0';
+ } else {
+ $edit = '';
+ }
$pageid = intval( $article->getID() );
- $key = "$wgDBname:pcache:idhash:$pageid-$hash";
+ $renderkey = (int)($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 $wgMemc, $wgCacheEpoch;
- $fname = "ParserCache::get";
+ global $wgCacheEpoch;
+ $fname = 'ParserCache::get';
wfProfileIn( $fname );
- $hash = $user->getPageRenderingHash();
- $pageid = intval( $article->getID() );
$key = $this->getKey( $article, $user );
- $value = $wgMemc->get( $key );
- if ( $value ) {
+
+ 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
- $touched = $article->getTouched();
- if ( $value->getTouched() != $touched || $touched > $wgCacheEpoch ) {
- $wgMemc->delete( $key );
+ $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 $wgMemc;
+ global $wgParserCacheExpireTime;
$key = $this->getKey( $article, $user );
- $parserOutput->setTouched( $article->getTouched() );
- if( $parserOutput->containsOldMagic() ){
- $expire = 3600; # 1 hour
+
+ 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 {
- $expire = 7*86400; # 7 days
+ wfDebug( "Parser output was marked as uncacheable and has not been saved.\n" );
}
-
- $wgMemc->set( $key, $parserOutput, $expire );
+
}
}
-
?>