includes/ObjectCache.php

   1 <?php
   2 /**
   3  * @package MediaWiki
   4  * @subpackage Cache
   5  */
   6
   7 /** */
   8 if (!defined('MEDIAWIKI')) die( "Not a valid entry point\n");
   9
  10
  11 /**
  12  * FakeMemCachedClient imitates the API of memcached-client v. 0.1.2.
  13  * It acts as a memcached server with no RAM, that is, all objects are
  14  * cleared the moment they are set. All set operations succeed and all
  15  * get operations return null.
  16  * @package MediaWiki
  17  * @subpackage Cache
  18  */
  19 class FakeMemCachedClient {
  20         function add ($key, $val, $exp = 0) { return true; }
  21         function decr ($key, $amt=1) { return null; }
  22         function delete ($key, $time = 0) { return false; }
  23         function disconnect_all () { }
  24         function enable_compress ($enable) { }
  25         function forget_dead_hosts () { }
  26         function get ($key) { return null; }
  27         function get_multi ($keys) { return array_pad(array(), count($keys), null); }
  28         function incr ($key, $amt=1) { return null; }
  29         function replace ($key, $value, $exp=0) { return false; }
  30         function run_command ($sock, $cmd) { return null; }
  31         function set ($key, $value, $exp=0){ return true; }
  32         function set_compress_threshold ($thresh){ }
  33         function set_debug ($dbg) { }
  34         function set_servers ($list) { }
  35 }
  36
  37 global $wgCaches;
  38 $wgCaches = array();
  39
  40 /** @todo document */
  41 function &wfGetCache( $inputType ) {
  42         global $wgCaches, $wgMemCachedServers, $wgMemCachedDebug;
  43         $cache = false;
  44
  45         if ( $inputType == CACHE_ANYTHING ) {
  46                 reset( $wgCaches );
  47                 $type = key( $wgCaches );
  48                 if ( $type === false || $type === CACHE_NONE ) {
  49                         $type = CACHE_DB;
  50                 }
  51         } else {
  52                 $type = $inputType;
  53         }
  54
  55         if ( $type == CACHE_MEMCACHED ) {
  56                 if ( !array_key_exists( CACHE_MEMCACHED, $wgCaches ) ){
  57                         require_once( 'memcached-client.php' );
  58
  59                         if (!class_exists("MemcachedClientforWiki")) {
  60                                 class MemCachedClientforWiki extends memcached {
  61                                         function _debugprint( $text ) {
  62                                                 wfDebug( "memcached: $text\n" );
  63                                         }
  64                                 }
  65                         }
  66
  67                         $wgCaches[CACHE_DB] = new MemCachedClientforWiki(
  68                                 array('persistant' => false, 'compress_threshold' => 1500 ) );
  69                         $cache =& $wgCaches[CACHE_DB];
  70                         $cache->set_servers( $wgMemCachedServers );
  71                         $cache->set_debug( $wgMemCachedDebug );
  72                 }
  73         } elseif ( $type == CACHE_ACCEL ) {
  74                 if ( !array_key_exists( CACHE_ACCEL, $wgCaches ) ) {
  75                         if ( function_exists( 'eaccelerator_get' ) ) {
  76                                 require_once( 'BagOStuff.php' );
  77                                 $wgCaches[CACHE_ACCEL] = new eAccelBagOStuff;
  78                         } elseif ( function_exists( 'mmcache_get' ) ) {
  79                                 require_once( 'BagOStuff.php' );
  80                                 $wgCaches[CACHE_ACCEL] = new TurckBagOStuff;
  81                         } else {
  82                                 $wgCaches[CACHE_ACCEL] = false;
  83                         }
  84                 }
  85                 if ( $wgCaches[CACHE_ACCEL] !== false ) {
  86                         $cache =& $wgCaches[CACHE_ACCEL];
  87                 }
  88         }
  89
  90         if ( $type == CACHE_DB || ( $inputType == CACHE_ANYTHING && $cache === false ) ) {
  91                 if ( !array_key_exists( CACHE_DB, $wgCaches ) ) {
  92                         require_once( 'BagOStuff.php' );
  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         return wfGetCache( $wgMainCacheType );
 111 }
 112
 113 function &wfGetMessageCacheStorage() {
 114         global $wgMessageCacheType;
 115         return wfGetCache( $wgMessageCacheType );
 116 }
 117
 118 function wfGetParserCacheStorage() {
 119         global $wgParserCacheType;
 120         return wfGetCache( $wgParserCacheType );
 121 }
 122
 123 ?>