kernel/lib/Cache.php
public static function setCacheType(string $sCacheName)
	{
		if ($sCacheName === 'file') { self::$_sTypeOfCache = 'file'; }
		else if ($sCacheName === 'memcache') { self::$_sTypeOfCache = 'memcache'; }
		else if ($sCacheName === 'apc') { self::$_sTypeOfCache = 'apc'; }
		else if ($sCacheName === 'redis') { self::$_sTypeOfCache = 'redis'; }
		else { self::$_sTypeOfCache = 'mock'; }
	}
public static function setCacheType(string $sCacheName)
	{
		if ($sCacheName === 'file') { self::$_sTypeOfCache = 'file'; }
		else if ($sCacheName === 'memcache') { self::$_sTypeOfCache = 'memcache'; }
		else if ($sCacheName === 'apc') { self::$_sTypeOfCache = 'apc'; }
		else if ($sCacheName === 'redis') { self::$_sTypeOfCache = 'redis'; }
		else { self::$_sTypeOfCache = 'mock'; }
	}
set the cache that we would use

@access private
@param  string $sCacheName name of cache
@return object