includes/ObjectCache.php

   1 <?php
   2 /**
   3  * @file
   4  * @ingroup 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  * @ingroup Cache
  13  */
  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 /** @todo document */
  36 function &wfGetCache( $inputType ) {
  37         global $wgCaches, $wgMemCachedServers, $wgMemCachedDebug, $wgMemCachedPersistent;
  38         $cache = false;
  39
  40         if ( $inputType == CACHE_ANYTHING ) {
  41                 reset( $wgCaches );
  42                 $type = key( $wgCaches );
  43                 if ( $type === false || $type === CACHE_NONE ) {
  44                         $type = CACHE_DB;
  45                 }
  46         } else {
  47                 $type = $inputType;
  48         }
  49
  50         if ( $type == CACHE_MEMCACHED ) {
  51                 if ( !array_key_exists( CACHE_MEMCACHED, $wgCaches ) ) {
  52                         require_once( 'memcached-client.php' );
  53                         if ( !class_exists("MemcachedClientforWiki") ) {
  54                                 class MemCachedClientforWiki extends memcached {
  55                                         function _debugprint( $text ) {
  56                                                 wfDebug( "memcached: $text" );
  57                                         }
  58                                 }
  59                         }
  60                         $wgCaches[CACHE_MEMCACHED] = new MemCachedClientforWiki(
  61                                 array('persistant' => $wgMemCachedPersistent, 'compress_threshold' => 1500 ) );
  62                         $wgCaches[CACHE_MEMCACHED]->set_servers( $wgMemCachedServers );
  63                         $wgCaches[CACHE_MEMCACHED]->set_debug( $wgMemCachedDebug );
  64                 }
  65                 $cache =& $wgCaches[CACHE_MEMCACHED];
  66         } elseif ( $type == CACHE_ACCEL ) {
  67                 if ( !array_key_exists( CACHE_ACCEL, $wgCaches ) ) {
  68                         if ( function_exists( 'eaccelerator_get' ) ) {
  69                                 $wgCaches[CACHE_ACCEL] = new eAccelBagOStuff;
  70                         } elseif ( function_exists( 'apc_fetch') ) {
  71                                 $wgCaches[CACHE_ACCEL] = new APCBagOStuff;
  72                         } elseif( function_exists( 'xcache_get' ) ) {
  73                                 $wgCaches[CACHE_ACCEL] = new XCacheBagOStuff();
  74                         } elseif ( function_exists( 'mmcache_get' ) ) {
  75                                 $wgCaches[CACHE_ACCEL] = new TurckBagOStuff;
  76                         } else {
  77                                 $wgCaches[CACHE_ACCEL] = false;
  78                         }
  79                 }
  80                 if ( $wgCaches[CACHE_ACCEL] !== false ) {
  81                         $cache =& $wgCaches[CACHE_ACCEL];
  82                 }
  83         } elseif ( $type == CACHE_DBA ) {
  84                 if ( !array_key_exists( CACHE_DBA, $wgCaches ) ) {
  85                         $wgCaches[CACHE_DBA] = new DBABagOStuff;
  86                 }
  87                 $cache =& $wgCaches[CACHE_DBA];
  88         }
  89
  90         if ( $type == CACHE_DB || ( $inputType == CACHE_ANYTHING && $cache === false ) ) {
  91                 if ( !array_key_exists( CACHE_DB, $wgCaches ) ) {
  92                         $wgCaches[CACHE_DB] = new MediaWikiBagOStuff('objectcache');
  93                 }
  94                 $cache =& $wgCaches[CACHE_DB];
  95         }
  96
  97         if ( $cache === false ) {
  98                 if ( !array_key_exists( CACHE_NONE, $wgCaches ) ) {
  99                         $wgCaches[CACHE_NONE] = new FakeMemCachedClient;
 100                 }
 101                 $cache =& $wgCaches[CACHE_NONE];
 102         }
 103
 104         return $cache;
 105 }
 106
 107 function &wfGetMainCache() {
 108         global $wgMainCacheType;
 109         $ret =& wfGetCache( $wgMainCacheType );
 110         return $ret;
 111 }
 112
 113 function &wfGetMessageCacheStorage() {
 114         global $wgMessageCacheType;
 115         $ret =& wfGetCache( $wgMessageCacheType );
 116         return $ret;
 117 }
 118
 119 function &wfGetParserCacheStorage() {
 120         global $wgParserCacheType;
 121         $ret =& wfGetCache( $wgParserCacheType );
 122         return $ret;
 123 }