@Override
	public void delete(String userId, SinaWeiboRecommendUser user,
			String tagName) {
		ShardedJedis jedis =  getConnection(); 
		String key = null;
		
		// 删除数据 sinaweibo:tag:userid:tagname:follows
		key = tagPrefix + userId + ":" + tagName + ":follows";
		jedis.srem(key, user.getUserId());

		// 删除数据 sinaweibo:follow:userid:followid:tags
		key = followPrefix + userId + ":" + user.getUserId() + ":tags";
		jedis.srem(key, tagName);
		
		// 如果用户关注的这个用户的tags数为0
		// 那么删除这个关注的用户，sinaweibo:follow:userid:follows
		if (0L == jedis.scard(key)) {
			key = followPrefix + userId + ":follows";
			jedis.srem(key, user.getUserId());
		}
		
		returnConnection(jedis);		
	}