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