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<?php
/**
* Functions to get cache objects.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
* http://www.gnu.org/copyleft/gpl.html
*
* @file
* @ingroup Cache
*/
/**
* Functions to get cache objects
*
* @ingroup Cache
*/
class ObjectCache {
static $instances = array();
/**
* Get a cached instance of the specified type of cache object.
*
* @param $id string
*
* @return ObjectCache
*/
static function getInstance( $id ) {
if ( isset( self::$instances[$id] ) ) {
return self::$instances[$id];
}
$object = self::newFromId( $id );
self::$instances[$id] = $object;
return $object;
}
/**
* Clear all the cached instances.
*/
static function clear() {
self::$instances = array();
}
/**
* Create a new cache object of the specified type.
*
* @param $id string
*
* @throws MWException
* @return ObjectCache
*/
static function newFromId( $id ) {
global $wgObjectCaches;
if ( !isset( $wgObjectCaches[$id] ) ) {
throw new MWException( "Invalid object cache type \"$id\" requested. " .
"It is not present in \$wgObjectCaches." );
}
return self::newFromParams( $wgObjectCaches[$id] );
}
/**
* Create a new cache object from parameters
*
* @param $params array
*
* @throws MWException
* @return ObjectCache
*/
static function newFromParams( $params ) {
if ( isset( $params['factory'] ) ) {
return call_user_func( $params['factory'], $params );
} elseif ( isset( $params['class'] ) ) {
$class = $params['class'];
return new $class( $params );
} else {
throw new MWException( "The definition of cache type \"" . print_r( $params, true ) . "\" lacks both " .
"factory and class parameters." );
}
}
/**
* Factory function referenced from DefaultSettings.php for CACHE_ANYTHING
*
* CACHE_ANYTHING means that stuff has to be cached, not caching is not an option.
* If a caching method is configured for any of the main caches ($wgMainCacheType,
* $wgMessageCacheType, $wgParserCacheType), then CACHE_ANYTHING will effectively
* be an alias to the configured cache choice for that.
* If no cache choice is configured (by default $wgMainCacheType is CACHE_NONE),
* then CACHE_ANYTHING will forward to CACHE_DB.
* @param $params array
* @return ObjectCache
*/
static function newAnything( $params ) {
global $wgMainCacheType, $wgMessageCacheType, $wgParserCacheType;
$candidates = array( $wgMainCacheType, $wgMessageCacheType, $wgParserCacheType );
foreach ( $candidates as $candidate ) {
if ( $candidate !== CACHE_NONE && $candidate !== CACHE_ANYTHING ) {
return self::getInstance( $candidate );
}
}
return self::getInstance( CACHE_DB );
}
/**
* Factory function referenced from DefaultSettings.php for CACHE_ACCEL.
*
* @param $params array
* @throws MWException
* @return ObjectCache
*/
static function newAccelerator( $params ) {
if ( function_exists( 'apc_fetch' ) ) {
$id = 'apc';
} elseif( function_exists( 'xcache_get' ) && wfIniGetBool( 'xcache.var_size' ) ) {
$id = 'xcache';
} elseif( function_exists( 'wincache_ucache_get' ) ) {
$id = 'wincache';
} else {
throw new MWException( "CACHE_ACCEL requested but no suitable object " .
"cache is present. You may want to install APC." );
}
return self::newFromId( $id );
}
/**
* Factory function that creates a memcached client object.
*
* This always uses the PHP client, since the PECL client has a different
* hashing scheme and a different interpretation of the flags bitfield, so
* switching between the two clients randomly would be disastrous.
*
* @param $params array
*
* @return MemcachedPhpBagOStuff
*/
static function newMemcached( $params ) {
return new MemcachedPhpBagOStuff( $params );
}
}
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