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                         $canCache = $article->checkTouched();
  27                         $cacheTime = $value->getCacheTime();
  28                         $touched = $article->mTouched;
  29                         if ( !$canCache || $value->getCacheTime() <= $touched || $cacheTime < $wgCacheEpoch ) {
  30                                 if ( !$canCache ) {
  31                                         wfDebug( "Invalid cached redirect, touched $touched, epoch $wgCacheEpoch, cached $cacheTime\n" );
  32                                 } else {
  33                                         wfDebug( "Key expired, touched $touched, epoch $wgCacheEpoch, cached $cacheTime\n" );
  34                                 }
  35                                 $wgMemc->delete( $key );
  36                                 $value = false;
  37                         }
  38                 } else {
  39                         $value = false;
  40                 }
  41
  42                 wfProfileOut( $fname );
  43                 return $value;
  44         }
  45
  46         function save( $parserOutput, &$article, &$user ){
  47                 global $wgMemc;
  48
  49                 $key = $this->getKey( $article, $user );
  50                 $now = wfTimestampNow();
  51                 $parserOutput->setCacheTime( $now );
  52                 $parserOutput->mText .= "\n<!-- Saved in parser cache with key $key and timestamp $now -->\n";
  53
  54                 if( $parserOutput->containsOldMagic() ){
  55                         $expire = 3600; # 1 hour
  56                 } else {
  57                         $expire = 86400; # 1 day
  58                 }
  59
  60                 $wgMemc->set( $key, $parserOutput, $expire );
  61         }
  62 }
  63
  64
  65 ?>