includes/ParserCache.php

   1 <?php
   2 /**
   3  *
   4  * @package MediaWiki
   5  */
   6
   7 /**
   8  *
   9  * @package MediaWiki
  10  */
  11 class ParserCache
  12 {
  13         function getKey( &$article, &$user ) {
  14                 global $wgDBname;
  15                 $hash = $user->getPageRenderingHash();
  16                 $pageid = intval( $article->getID() );
  17                 $key = "$wgDBname:pcache:idhash:$pageid-$hash";
  18                 return $key;
  19         }
  20
  21         function get( &$article, &$user ) {
  22                 global $wgMemc, $wgCacheEpoch;
  23                 $fname = 'ParserCache::get';
  24                 wfProfileIn( $fname );
  25
  26                 $hash = $user->getPageRenderingHash();
  27                 $pageid = intval( $article->getID() );
  28                 $key = $this->getKey( $article, $user );
  29                 wfDebug( "Trying parser cache $key\n" );
  30                 $value = $wgMemc->get( $key );
  31                 if ( is_object( $value ) ) {
  32                         wfDebug( "Found.\n" );
  33                         # Delete if article has changed since the cache was made
  34                         $canCache = $article->checkTouched();
  35                         $cacheTime = $value->getCacheTime();
  36                         $touched = $article->mTouched;
  37                         if ( !$canCache || $value->getCacheTime() <= $touched || $cacheTime < $wgCacheEpoch ) {
  38                                 if ( !$canCache ) {
  39                                         wfDebug( "Invalid cached redirect, touched $touched, epoch $wgCacheEpoch, cached $cacheTime\n" );
  40                                 } else {
  41                                         wfDebug( "Key expired, touched $touched, epoch $wgCacheEpoch, cached $cacheTime\n" );
  42                                 }
  43                                 $wgMemc->delete( $key );
  44                                 $value = false;
  45                         }
  46                 } else {
  47                         wfDebug( "Parser cache miss.\n" );
  48                         $value = false;
  49                 }
  50
  51                 wfProfileOut( $fname );
  52                 return $value;
  53         }
  54
  55         function save( $parserOutput, &$article, &$user ){
  56                 global $wgMemc;
  57
  58                 $key = $this->getKey( $article, $user );
  59                 $now = wfTimestampNow();
  60                 $parserOutput->setCacheTime( $now );
  61                 $parserOutput->mText .= "\n<!-- Saved in parser cache with key $key and timestamp $now -->\n";
  62
  63                 if( $parserOutput->containsOldMagic() ){
  64                         $expire = 3600; # 1 hour
  65                 } else {
  66                         $expire = 86400; # 1 day
  67                 }
  68
  69                 $wgMemc->set( $key, $parserOutput, $expire );
  70         }
  71 }
  72
  73
  74 ?>