includes/ParserCache.php

   1 <?php
   2
   3 class ParserCache
   4 {
   5         function get( &$article, &$user ){
   6                 $hash = $user->getPageRenderingHash();
   7                 $pageid = intval( $id );
   8                 $res = wfQuery("SELECT pc_data FROM parsercache WHERE pc_pageid = {$pageid} ".
   9                         " AND pc_prefhash = '{$hash}' AND pc_expire > NOW()", DB_WRITE);
  10                 $row = wfFetchObject ( $res );
  11                 if( $row ){
  12                         $retVal = unserialize( gzuncompress($row->pc_data) );
  13                         wfProfileOut( $fname );
  14                 } else {
  15                         $retVal = false;
  16                 }
  17                 return $retVal;
  18         }
  19
  20         function save( $parserOutput, &$article, &$user ){
  21                 $hash = $user->getPageRenderingHash();
  22                 $pageid = intval( $article->getID() );
  23                 $title = wfStrencode( $article->mTitle->getPrefixedDBKey() );
  24                 $ser = addslashes( gzcompress( serialize( $parserOutput ) ) );
  25                 if( $parserOutput->containsOldMagic() ){
  26                         $expire = "1 HOUR";
  27                 } else {
  28                         $expire = "7 DAY";
  29                 }
  30
  31                 wfQuery("REPLACE INTO parsercache (pc_prefhash,pc_pageid,pc_title,pc_data, pc_expire) ".
  32                         "VALUES('{$hash}', {$pageid}, '{$title}', '{$ser}', ".
  33                                 "DATE_ADD(NOW(), INTERVAL {$expire}))", DB_WRITE);
  34
  35                 if( rand() % 50 == 0 ){ // more efficient to just do it sometimes
  36                         $this->purge();
  37                 }
  38         }
  39
  40         function purge(){
  41                 wfQuery("DELETE FROM parsercache WHERE pc_expire < NOW() LIMIT 250", DB_WRITE);
  42         }
  43
  44         function clearLinksTo( $pid ){
  45                 $pid = intval( $pid );
  46                 wfQuery("DELETE parsercache FROM parsercache,links ".
  47                         "WHERE pc_pageid=links.l_from AND l_to={$pid}", DB_WRITE);
  48                 wfQuery("DELETE FROM parsercache WHERE pc_pageid='{$pid}'", DB_WRITE);
  49         }
  50
  51         # $title is a prefixed db title, for example like Title->getPrefixedDBkey() returns.
  52         function clearBrokenLinksTo( $title ){
  53                 $title = wfStrencode( $title );
  54                 wfQuery("DELETE parsercache FROM parsercache,brokenlinks ".
  55                         "WHERE pc_pageid=bl_from AND bl_to='{$title}'", DB_WRITE);
  56         }
  57
  58         # $pid is a page id
  59         function clearPage( $pid, $namespace ){
  60                 $pid = intval( $pid );
  61                 if( $namespace == NS_MEDIAWIKI ){
  62                         $this->clearLinksTo( $pid );
  63                 } else {
  64                         wfQuery("DELETE FROM parsercache WHERE pc_pageid='{$pid}'", DB_WRITE);
  65                 }
  66         }
  67 }
  68
  69
  70 ?>