includes/ParserCache.php

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