秒杀方案

-- 秒杀商品表
CREATE TABLE `miaosha_goods` (
  `id` bigint(20) NOT NULL AUTO_INCREMENT COMMENT ‘秒杀的商品表‘,
  `goods_id` bigint(20) DEFAULT NULL COMMENT ‘商品Id‘,
  `miaosha_price` decimal(10,2) DEFAULT ‘0.00‘ COMMENT ‘秒杀价‘,
  `stock_count` int(11) DEFAULT NULL COMMENT ‘库存数量‘,
  `start_date` datetime DEFAULT NULL COMMENT ‘秒杀开始时间‘,
  `end_date` datetime DEFAULT NULL COMMENT ‘秒杀结束时间‘,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=5 DEFAULT CHARSET=utf8mb4;

--秒杀订单表

CREATE TABLE `miaosha_order` (
`id` bigint(20) NOT NULL AUTO_INCREMENT,
`user_id` bigint(20) DEFAULT NULL COMMENT ‘用户ID‘,
`order_id` bigint(20) DEFAULT NULL COMMENT ‘订单ID‘,
`goods_id` bigint(20) DEFAULT NULL COMMENT ‘商品ID‘,
PRIMARY KEY (`id`),
UNIQUE KEY `u_uid_gid` (`user_id`,`goods_id`) USING BTREE
) ENGINE=InnoDB AUTO_INCREMENT=1551 DEFAULT CHARSET=utf8mb4;
/*!40101 SET character_set_client = @saved_cs_client */;

--订单详情表

CREATE TABLE `order_info` (
`id` bigint(20) NOT NULL AUTO_INCREMENT,
`user_id` bigint(20) DEFAULT NULL COMMENT ‘用户ID‘,
`goods_id` bigint(20) DEFAULT NULL COMMENT ‘商品ID‘,
`delivery_addr_id` bigint(20) DEFAULT NULL COMMENT ‘收获地址ID‘,
`goods_name` varchar(16) DEFAULT NULL COMMENT ‘冗余过来的商品名称‘,
`goods_count` int(11) DEFAULT ‘0‘ COMMENT ‘商品数量‘,
`goods_price` decimal(10,2) DEFAULT ‘0.00‘ COMMENT ‘商品单价‘,
`order_channel` tinyint(4) DEFAULT ‘0‘ COMMENT ‘1pc，2android，3ios‘,
`status` tinyint(4) DEFAULT ‘0‘ COMMENT ‘订单状态，0新建未支付，1已支付，2已发货，3已收货，4已退款，5已完成‘,
`create_date` datetime DEFAULT NULL COMMENT ‘订单的创建时间‘,
`pay_date` datetime DEFAULT NULL COMMENT ‘支付时间‘,
PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=1565 DEFAULT CHARSET=utf8mb4;

--秒杀用户表

CREATE TABLE `miaosha_user` (
`id` bigint(20) NOT NULL COMMENT ‘用户ID，手机号码‘,
`nickname` varchar(255) NOT NULL,
`password` varchar(32) DEFAULT NULL COMMENT ‘MD5(MD5(pass明文+固定salt) + salt)‘,
`salt` varchar(10) DEFAULT NULL,
`head` varchar(128) DEFAULT NULL COMMENT ‘头像，云存储的ID‘,
`register_date` datetime DEFAULT NULL COMMENT ‘注册时间‘,
`last_login_date` datetime DEFAULT NULL COMMENT ‘上蔟登录时间‘,
`login_count` int(11) DEFAULT ‘0‘ COMMENT ‘登录次数‘,
PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

@Controller
@RequestMapping("/miaosha")
public class MiaoshaController implements InitializingBean {
	
	private static volatile boolean isGlobalActivityOver = false;
	private static HashMap<Long, Integer> stockMap =  new HashMap<Long, Integer>();
	//内存标记减少对redis 的访问
	private HashMap<Long, Boolean> localOverMap =  new HashMap<Long, Boolean>();
	
	/**
	 * 系统初始化  实现 implements InitializingBean  就可以完成 系统初始化加载数据
	 * */
　　　　 @Override
	public void afterPropertiesSet() throws Exception {
		List<GoodsVo> goodsList = goodsService.listGoodsVo();
		if(goodsList == null) {
			return;
		}
		for(GoodsVo goods : goodsList) {
			redisService.set(GoodsKey.getMiaoshaGoodsStock, ""+goods.getId(), goods.getStockCount());
			//内存标记，把商品的信息放到map中，进行判断减少对redis 的访问
			localOverMap.put(goods.getId(), false);
		}
	

//内存标记，减少redis访问
    	boolean over = localOverMap.get(goodsId);
    	if(over) {
    		return Result.error(CodeMsg.MIAO_SHA_OVER);
    	}
    	//预减库存
    	long stock = redisService.decr(GoodsKey.getMiaoshaGoodsStock, ""+goodsId);//10
    	if(stock < 0) {
    		 localOverMap.put(goodsId, true);
    		return Result.error(CodeMsg.MIAO_SHA_OVER);
    	}
    	//判断是否已经秒杀到了
    	MiaoshaOrder order = orderService.getMiaoshaOrderByUserIdGoodsId(user.getId(), goodsId);
    	if(order != null) {
    		return Result.error(CodeMsg.REPEATE_MIAOSHA);
    	}
    	//入队
    	MiaoshaMessage mm = new MiaoshaMessage();
    	mm.setUser(user);
    	mm.setGoodsId(goodsId);
    	sender.sendMiaoshaMessage(mm);
    	return Result.success(0);//排队中

log.info("receive message:"+message);
			MiaoshaMessage mm  = RedisService.stringToBean(message, MiaoshaMessage.class);
			MiaoshaUser user = mm.getUser();
			long goodsId = mm.getGoodsId();
			//判断商品数量是否大于零
			GoodsVo goods = goodsService.getGoodsVoByGoodsId(goodsId);
	    	int stock = goods.getStockCount();
	    	if(stock <= 0) {
	    		return;
	    	}
	    	//判断是否已经秒杀到了
	    	MiaoshaOrder order = orderService.getMiaoshaOrderByUserIdGoodsId(user.getId(), goodsId);
	    	if(order != null) {
	    		return;
	    	}

　　　　　　//减库存 下订单 写入秒杀订单
		boolean success = goodsService.reduceStock(goods);
		if(success) {
			return orderService.createOrder(user, goods);
		}else {
			setGoodsOver(goods.getId());
			return null;
		}

	@Transactional
	public OrderInfo createOrder(MiaoshaUser user, GoodsVo goods) {
		OrderInfo orderInfo = new OrderInfo();
		orderInfo.setCreateDate(new Date());
		orderInfo.setDeliveryAddrId(0L);
		orderInfo.setGoodsCount(1);
		orderInfo.setGoodsId(goods.getId());
		orderInfo.setGoodsName(goods.getGoodsName());
		orderInfo.setGoodsPrice(goods.getMiaoshaPrice());
		orderInfo.setOrderChannel(1);
		orderInfo.setStatus(0);
		orderInfo.setUserId(user.getId());
		orderDao.insert(orderInfo);
		MiaoshaOrder miaoshaOrder = new MiaoshaOrder();
		miaoshaOrder.setGoodsId(goods.getId());
		miaoshaOrder.setOrderId(orderInfo.getId());
		miaoshaOrder.setUserId(user.getId());
		orderDao.insertMiaoshaOrder(miaoshaOrder);
　　　　　　　　　　//订单信息保存到redis
		redisService.set(OrderKey.getMiaoshaOrderByUidGid, ""+user.getId()+"_"+goods.getId(), miaoshaOrder);
		 
		return orderInfo;
	}