includes/ParserCache.php

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