includes/ObjectCache.php

   1 <?php
   2 /**
   3  * @package MediaWiki
   4  * @subpackage Cache
   5  */
   6
   7 /**
   8  * FakeMemCachedClient imitates the API of memcached-client v. 0.1.2.
   9  * It acts as a memcached server with no RAM, that is, all objects are
  10  * cleared the moment they are set. All set operations succeed and all
  11  * get operations return null.
  12  * @package MediaWiki
  13  * @subpackage Cache
  14  */
  15 class FakeMemCachedClient {
  16         function add ($key, $val, $exp = 0) { return true; }
  17         function decr ($key, $amt=1) { return null; }
  18         function delete ($key, $time = 0) { return false; }
  19         function disconnect_all () { }
  20         function enable_compress ($enable) { }
  21         function forget_dead_hosts () { }
  22         function get ($key) { return null; }
  23         function get_multi ($keys) { return array_pad(array(), count($keys), null); }
  24         function incr ($key, $amt=1) { return null; }
  25         function replace ($key, $value, $exp=0) { return false; }
  26         function run_command ($sock, $cmd) { return null; }
  27         function set ($key, $value, $exp=0){ return true; }
  28         function set_compress_threshold ($thresh){ }
  29         function set_debug ($dbg) { }
  30         function set_servers ($list) { }
  31 }
  32
  33 global $wgCaches;
  34 $wgCaches = array();
  35
  36 class ObjectCacheManager {
  37         /* @static */
  38         function getCache( $inputType ) {
  39                 global $wgCaches, $wgMemCachedServers, $wgMemCachedDebug, $wgMemCachedPersistent;
  40                 $cache = false;
  41
  42                 if ( $inputType == CACHE_ANYTHING ) {
  43                         reset( $wgCaches );
  44                         $type = key( $wgCaches );
  45                         if ( $type === false || $type === CACHE_NONE ) {
  46                                 $type = CACHE_DB;
  47                         }
  48                 } else {
  49                         $type = $inputType;
  50                 }
  51
  52                 if ( $type == CACHE_MEMCACHED ) {
  53                         if ( !array_key_exists( CACHE_MEMCACHED, $wgCaches ) ){
  54                                 $wgCaches[CACHE_DB] = new MemCachedClientforWiki(
  55                                         array('persistant' => $wgMemCachedPersistent, 'compress_threshold' => 1500 ) );
  56                                 $cache =& $wgCaches[CACHE_DB];
  57                                 $cache->set_servers( $wgMemCachedServers );
  58                                 $cache->set_debug( $wgMemCachedDebug );
  59                         }
  60                 } elseif ( $type == CACHE_ACCEL ) {
  61                         if ( !array_key_exists( CACHE_ACCEL, $wgCaches ) ) {
  62                                 if ( function_exists( 'eaccelerator_get' ) ) {
  63                                         $wgCaches[CACHE_ACCEL] = new eAccelBagOStuff;
  64                                 } elseif ( function_exists( 'apc_fetch') ) {
  65                                         $wgCaches[CACHE_ACCEL] = new APCBagOStuff;
  66                                 } elseif ( function_exists( 'mmcache_get' ) ) {
  67                                         $wgCaches[CACHE_ACCEL] = new TurckBagOStuff;
  68                                 } else {
  69                                         $wgCaches[CACHE_ACCEL] = false;
  70                                 }
  71                         }
  72                         if ( $wgCaches[CACHE_ACCEL] !== false ) {
  73                                 $cache =& $wgCaches[CACHE_ACCEL];
  74                         }
  75                 }
  76
  77                 if ( $type == CACHE_DB || ( $inputType == CACHE_ANYTHING && $cache === false ) ) {
  78                         if ( !array_key_exists( CACHE_DB, $wgCaches ) ) {
  79                                 $wgCaches[CACHE_DB] = new MediaWikiBagOStuff('objectcache');
  80                         }
  81                         $cache =& $wgCaches[CACHE_DB];
  82                 }
  83
  84                 if ( $cache === false ) {
  85                         if ( !array_key_exists( CACHE_NONE, $wgCaches ) ) {
  86                                 $wgCaches[CACHE_NONE] = new FakeMemCachedClient;
  87                         }
  88                         $cache =& $wgCaches[CACHE_NONE];
  89                 }
  90
  91                 return $cache;
  92         }
  93
  94         /** @static */
  95         function &getMainCache() {
  96                 global $wgMainCacheType;
  97                 $ret =& ObjectCacheManager::getCache( $wgMainCacheType );
  98                 return $ret;
  99         }
 100
 101         /** @static */
 102         function &getMessageCache() {
 103                 global $wgMessageCacheType;
 104                 $ret =& ObjectCacheManager::getCache( $wgMessageCacheType );
 105                 return $ret;
 106         }
 107
 108         /** @static */
 109         function &getParserCache() {
 110                 global $wgParserCacheType;
 111                 $ret =& ObjectCacheManager::getCache( $wgParserCacheType );
 112                 return $ret;
 113         }
 114
 115 }
 116
 117 class MemCachedClientforWiki extends memcached {
 118         function _debugprint( $text ) {
 119                 wfDebug( "memcached: $text\n" );
 120         }
 121 }
 122
 123 ?>