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 /** @todo document */
  37 function &wfGetCache( $inputType ) {
  38         global $wgCaches, $wgMemCachedServers, $wgMemCachedDebug, $wgMemCachedPersistent;
  39         $cache = false;
  40
  41         if ( $inputType == CACHE_ANYTHING ) {
  42                 reset( $wgCaches );
  43                 $type = key( $wgCaches );
  44                 if ( $type === false || $type === CACHE_NONE ) {
  45                         $type = CACHE_DB;
  46                 }
  47         } else {
  48                 $type = $inputType;
  49         }
  50
  51         if ( $type == CACHE_MEMCACHED ) {
  52                 if ( !array_key_exists( CACHE_MEMCACHED, $wgCaches ) ){
  53                         require_once( 'memcached-client.php' );
  54
  55                         if (!class_exists("MemcachedClientforWiki")) {
  56                                 class MemCachedClientforWiki extends memcached {
  57                                         function _debugprint( $text ) {
  58                                                 wfDebug( "memcached: $text\n" );
  59                                         }
  60                                 }
  61                         }
  62
  63                         $wgCaches[CACHE_DB] = new MemCachedClientforWiki(
  64                                 array('persistant' => $wgMemCachedPersistent, 'compress_threshold' => 1500 ) );
  65                         $cache =& $wgCaches[CACHE_DB];
  66                         $cache->set_servers( $wgMemCachedServers );
  67                         $cache->set_debug( $wgMemCachedDebug );
  68                 }
  69         } elseif ( $type == CACHE_ACCEL ) {
  70                 if ( !array_key_exists( CACHE_ACCEL, $wgCaches ) ) {
  71                         if ( function_exists( 'eaccelerator_get' ) ) {
  72                                 $wgCaches[CACHE_ACCEL] = new eAccelBagOStuff;
  73                         } elseif ( function_exists( 'apc_fetch') ) {
  74                                 $wgCaches[CACHE_ACCEL] = new APCBagOStuff;
  75                         } elseif ( function_exists( 'mmcache_get' ) ) {
  76                                 $wgCaches[CACHE_ACCEL] = new TurckBagOStuff;
  77                         } else {
  78                                 $wgCaches[CACHE_ACCEL] = false;
  79                         }
  80                 }
  81                 if ( $wgCaches[CACHE_ACCEL] !== false ) {
  82                         $cache =& $wgCaches[CACHE_ACCEL];
  83                 }
  84         } elseif ( $type == CACHE_DBA ) {
  85                 if ( !array_key_exists( CACHE_DBA, $wgCaches ) ) {
  86                         $wgCaches[CACHE_DBA] = new DBABagOStuff;
  87                 }
  88                 $cache =& $wgCaches[CACHE_DBA];
  89         }
  90
  91         if ( $type == CACHE_DB || ( $inputType == CACHE_ANYTHING && $cache === false ) ) {
  92                 if ( !array_key_exists( CACHE_DB, $wgCaches ) ) {
  93                         $wgCaches[CACHE_DB] = new MediaWikiBagOStuff('objectcache');
  94                 }
  95                 $cache =& $wgCaches[CACHE_DB];
  96         }
  97
  98         if ( $cache === false ) {
  99                 if ( !array_key_exists( CACHE_NONE, $wgCaches ) ) {
 100                         $wgCaches[CACHE_NONE] = new FakeMemCachedClient;
 101                 }
 102                 $cache =& $wgCaches[CACHE_NONE];
 103         }
 104
 105         return $cache;
 106 }
 107
 108 function &wfGetMainCache() {
 109         global $wgMainCacheType;
 110         $ret =& wfGetCache( $wgMainCacheType );
 111         return $ret;
 112 }
 113
 114 function &wfGetMessageCacheStorage() {
 115         global $wgMessageCacheType;
 116         $ret =& wfGetCache( $wgMessageCacheType );
 117         return $ret;
 118 }
 119
 120 function &wfGetParserCacheStorage() {
 121         global $wgParserCacheType;
 122         $ret =& wfGetCache( $wgParserCacheType );
 123         return $ret;
 124 }
 125
 126 ?>