includes/ObjectCache.php

   1 <?php
   2 /**
   3  * @package MediaWiki
   4  * @subpackage Cache
   5  */
   6
   7 /** */
   8 if (!defined('MEDIAWIKI')) {
   9         echo "Not a valid entry point\n";
  10         die( -1 );
  11 }
  12
  13
  14 /**
  15  * FakeMemCachedClient imitates the API of memcached-client v. 0.1.2.
  16  * It acts as a memcached server with no RAM, that is, all objects are
  17  * cleared the moment they are set. All set operations succeed and all
  18  * get operations return null.
  19  * @package MediaWiki
  20  * @subpackage Cache
  21  */
  22 class FakeMemCachedClient {
  23         function add ($key, $val, $exp = 0) { return true; }
  24         function decr ($key, $amt=1) { return null; }
  25         function delete ($key, $time = 0) { return false; }
  26         function disconnect_all () { }
  27         function enable_compress ($enable) { }
  28         function forget_dead_hosts () { }
  29         function get ($key) { return null; }
  30         function get_multi ($keys) { return array_pad(array(), count($keys), null); }
  31         function incr ($key, $amt=1) { return null; }
  32         function replace ($key, $value, $exp=0) { return false; }
  33         function run_command ($sock, $cmd) { return null; }
  34         function set ($key, $value, $exp=0){ return true; }
  35         function set_compress_threshold ($thresh){ }
  36         function set_debug ($dbg) { }
  37         function set_servers ($list) { }
  38 }
  39
  40 global $wgCaches;
  41 $wgCaches = array();
  42
  43 /** @todo document */
  44 function &wfGetCache( $inputType ) {
  45         global $wgCaches, $wgMemCachedServers, $wgMemCachedDebug;
  46         $cache = false;
  47
  48         if ( $inputType == CACHE_ANYTHING ) {
  49                 reset( $wgCaches );
  50                 $type = key( $wgCaches );
  51                 if ( $type === false || $type === CACHE_NONE ) {
  52                         $type = CACHE_DB;
  53                 }
  54         } else {
  55                 $type = $inputType;
  56         }
  57
  58         if ( $type == CACHE_MEMCACHED ) {
  59                 if ( !array_key_exists( CACHE_MEMCACHED, $wgCaches ) ){
  60                         require_once( 'memcached-client.php' );
  61
  62                         if (!class_exists("MemcachedClientforWiki")) {
  63                                 class MemCachedClientforWiki extends memcached {
  64                                         function _debugprint( $text ) {
  65                                                 wfDebug( "memcached: $text\n" );
  66                                         }
  67                                 }
  68                         }
  69
  70                         $wgCaches[CACHE_DB] = new MemCachedClientforWiki(
  71                                 array('persistant' => false, 'compress_threshold' => 1500 ) );
  72                         $cache =& $wgCaches[CACHE_DB];
  73                         $cache->set_servers( $wgMemCachedServers );
  74                         $cache->set_debug( $wgMemCachedDebug );
  75                 }
  76         } elseif ( $type == CACHE_ACCEL ) {
  77                 if ( !array_key_exists( CACHE_ACCEL, $wgCaches ) ) {
  78                         if ( function_exists( 'eaccelerator_get' ) ) {
  79                                 require_once( 'BagOStuff.php' );
  80                                 $wgCaches[CACHE_ACCEL] = new eAccelBagOStuff;
  81                         } elseif ( function_exists( 'mmcache_get' ) ) {
  82                                 require_once( 'BagOStuff.php' );
  83                                 $wgCaches[CACHE_ACCEL] = new TurckBagOStuff;
  84                         } else {
  85                                 $wgCaches[CACHE_ACCEL] = false;
  86                         }
  87                 }
  88                 if ( $wgCaches[CACHE_ACCEL] !== false ) {
  89                         $cache =& $wgCaches[CACHE_ACCEL];
  90                 }
  91         }
  92
  93         if ( $type == CACHE_DB || ( $inputType == CACHE_ANYTHING && $cache === false ) ) {
  94                 if ( !array_key_exists( CACHE_DB, $wgCaches ) ) {
  95                         require_once( 'BagOStuff.php' );
  96                         $wgCaches[CACHE_DB] = new MediaWikiBagOStuff('objectcache');
  97                 }
  98                 $cache =& $wgCaches[CACHE_DB];
  99         }
 100
 101         if ( $cache === false ) {
 102                 if ( !array_key_exists( CACHE_NONE, $wgCaches ) ) {
 103                         $wgCaches[CACHE_NONE] = new FakeMemCachedClient;
 104                 }
 105                 $cache =& $wgCaches[CACHE_NONE];
 106         }
 107
 108         return $cache;
 109 }
 110
 111 function &wfGetMainCache() {
 112         global $wgMainCacheType;
 113         $ret =& wfGetCache( $wgMainCacheType );
 114         return $ret;
 115 }
 116
 117 function &wfGetMessageCacheStorage() {
 118         global $wgMessageCacheType;
 119         $ret =& wfGetCache( $wgMessageCacheType );
 120         return $ret;
 121 }
 122
 123 function &wfGetParserCacheStorage() {
 124         global $wgParserCacheType;
 125         $ret =& wfGetCache( $wgParserCacheType );
 126         return $ret;
 127 }
 128
 129 ?>