includes/ObjectCache.php

   1 <?php
   2 /**
   3  * @package MediaWiki
   4  * @subpackage Cache
   5  */
   6
   7 if (!defined('MEDIAWIKI')) die( "Not a valid entry point\n");
   8
   9
  10 # FakeMemCachedClient imitates the API of memcached-client v. 0.1.2.
  11 # It acts as a memcached server with no RAM, that is, all objects are
  12 # cleared the moment they are set. All set operations succeed and all
  13 # get operations return null.
  14 class FakeMemCachedClient {
  15         function add ($key, $val, $exp = 0) { return true; }
  16         function decr ($key, $amt=1) { return null; }
  17         function delete ($key, $time = 0) { return false; }
  18         function disconnect_all () { }
  19         function enable_compress ($enable) { }
  20         function forget_dead_hosts () { }
  21         function get ($key) { return null; }
  22         function get_multi ($keys) { return array_pad(array(), count($keys), null); }
  23         function incr ($key, $amt=1) { return null; }
  24         function replace ($key, $value, $exp=0) { return false; }
  25         function run_command ($sock, $cmd) { return null; }
  26         function set ($key, $value, $exp=0){ return true; }
  27         function set_compress_threshold ($thresh){ }
  28         function set_debug ($dbg) { }
  29         function set_servers ($list) { }
  30 }
  31
  32 global $wgCaches;
  33 $wgCaches = array();
  34
  35 function &wfGetCache( $inputType ) {
  36         global $wgCaches, $wgMemCachedServers, $wgMemCachedDebug;
  37         $cache = false;
  38
  39         if ( $inputType == CACHE_ANYTHING ) {
  40                 reset( $wgCaches );
  41                 $type = key( $wgCaches );
  42                 if ( $type === false || $type === CACHE_NONE ) {
  43                         $type = CACHE_DB;
  44                 }
  45         } else {
  46                 $type = $inputType;
  47         }
  48
  49         if ( $type == CACHE_MEMCACHED ) {
  50                 if ( !array_key_exists( CACHE_MEMCACHED, $wgCaches ) ){
  51                         require_once( 'memcached-client.php' );
  52
  53                         class MemCachedClientforWiki extends memcached {
  54                                 function _debugprint( $text ) {
  55                                         wfDebug( "memcached: $text\n" );
  56                                 }
  57                         }
  58
  59                         $wgCaches[CACHE_DB] = new MemCachedClientforWiki(
  60                                 array('persistant' => true, 'compress_threshold' => 1500 ) );
  61                         $cache =& $wgCaches[CACHE_DB];
  62                         $cache->set_servers( $wgMemCachedServers );
  63                         $cache->set_debug( $wgMemCachedDebug );
  64                 }
  65         } elseif ( $type == CACHE_ACCEL ) {
  66                 if ( !array_key_exists( CACHE_ACCEL, $wgCaches ) ) {
  67                         if ( function_exists( 'eaccelerator_get' ) ) {
  68                                 require_once( 'BagOStuff.php' );
  69                                 $wgCaches[CACHE_ACCEL] = new eAccelBagOStuff;
  70                         } elseif ( function_exists( 'mmcache_get' ) ) {
  71                                 require_once( 'BagOStuff.php' );
  72                                 $wgCaches[CACHE_ACCEL] = new TurckBagOStuff;
  73                         } else {
  74                                 $wgCaches[CACHE_ACCEL] = false;
  75                         }
  76                 }
  77                 if ( $wgCaches[CACHE_ACCEL] !== false ) {
  78                         $cache =& $wgCaches[CACHE_ACCEL];
  79                 }
  80         }
  81
  82         if ( $type == CACHE_DB || ( $inputType == CACHE_ANYTHING && $cache === false ) ) {
  83                 if ( !array_key_exists( CACHE_DB, $wgCaches ) ) {
  84                         require_once( 'BagOStuff.php' );
  85                         $wgCaches[CACHE_DB] = new MediaWikiBagOStuff('objectcache');
  86                 }
  87                 $cache =& $wgCaches[CACHE_DB];
  88         }
  89
  90         if ( $cache === false ) {
  91                 if ( !array_key_exists( CACHE_NONE, $wgCaches ) ) {
  92                         $wgCaches[CACHE_NONE] = new FakeMemCachedClient;
  93                 }
  94                 $cache =& $wgCaches[CACHE_NONE];
  95         }
  96
  97         return $cache;
  98 }
  99
 100 function &wfGetMainCache() {
 101         global $wgMainCacheType;
 102         return wfGetCache( $wgMainCacheType );
 103 }
 104
 105 function &wfGetMessageCacheStorage() {
 106         global $wgMessageCacheType;
 107         return wfGetCache( $wgMessageCacheType );
 108 }
 109
 110 function wfGetParserCacheStorage() {
 111         global $wgParserCacheType;
 112         return wfGetCache( $wgParserCacheType );
 113 }
 114
 115 ?>