<?php
+/**
+ *
+ * @package MediaWiki
+ * @subpackage Cache
+ */
-class ParserCache
-{
+/**
+ *
+ * @package MediaWiki
+ */
+class ParserCache {
+ /**
+ * 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 =& $memCached;
+ }
+
function getKey( &$article, &$user ) {
global $wgDBname;
$hash = $user->getPageRenderingHash();
}
function get( &$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 );
+
wfDebug( "Trying parser cache $key\n" );
- $value = $wgMemc->get( $key );
- if ( $value ) {
+ $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();
+ $canCache = $article->checkTouched();
$cacheTime = $value->getCacheTime();
- if ( $value->getCacheTime() <= $touched || $cacheTime < $wgCacheEpoch ) {
- wfDebug( "Key expired, touched $touched, epoch $wgCacheEpoch, cached $cacheTime\n" );
- $wgMemc->delete( $key );
+ $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 {
+ wfIncrStats( "pcache_hit" );
}
} else {
+ wfDebug( "Parser cache miss.\n" );
+ wfIncrStats( "pcache_miss_absent" );
$value = false;
}
}
function save( $parserOutput, &$article, &$user ){
- global $wgMemc;
$key = $this->getKey( $article, $user );
$now = wfTimestampNow();
$parserOutput->setCacheTime( $now );
$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 = 86400; # 1 day
}
-
- $wgMemc->set( $key, $parserOutput, $expire );
+ $this->mMemc->set( $key, $parserOutput, $expire );
}
}