@Override
	protected MultiLevelCache getCurrentLevelCache(String poolName) {
		String upperCase = poolName.toUpperCase();
		SockIOPool pool = SockIOPool.getInstance(upperCase);
		if (!pool.isInitialized()) {
			try {
				initializePool(pool);
			} catch (Exception e) {
				throw new CacheUnreachableException("创建Memcached实例失败");
			}

		}

		return initializeClient(upperCase);
	}