外卖小程序实战

    /**
     * 商家端APP接单
     * @param param
     * @param userId
     * @return
     */
    @Override
    public Object acceptOrder(acceptOrderDto param, Integer userId) throws Exception {
 
        //1.检查参数
        if (param == null || param.getShopId() == null) {
            throw new TakeOutException("shopId 为空");
        }
 
        // 2. 获取分布式锁，key设置为订单 ID
        RLock lock = redissonClient.getLock("order_lock:" + param.getOrderId());
        try {
            // 2.1 尝试获取锁，等待超时时间30秒
            boolean lockAcquired = lock.tryLock(30, TimeUnit.SECONDS);
            if (!lockAcquired) {
                throw new TakeOutException("获取订单锁失败");
            }
            //3.得到订单信息
            Order order = orderMapper.selectById(param.getOrderId());
 
            //订单不存在
            if (order == null) {
                throw new TakeOutException("订单不存在");
            }
 
            //4.改变订单状态
            order.setStatus(2); // 设置订单状态为“已接单”
            orderMapper.updateById(order);
 
            //5.返回处理结果
            acceptedOrderResp acceptedOrderResp = new acceptedOrderResp();
            acceptedOrderResp.setStatus(2);
            acceptedOrderResp.setShopId(param.getShopId());
            return Result.ok(acceptedOrderResp);
        }finally {
            // 6. 无论如何，在方法结束时都要释放锁
            lock.unlock();
        }
 
    }

    @PostMapping("/acceptedOrder")
    @Operation(summary = "商家端APP接受订单")
    public Result acceptOrder(@RequestBody @Valid acceptOrderDto param) throws Exception {
        log.info("/api/order/acceptedOrder ", JSONUtil.toJsonStr(param));
        Integer userId = super.getUserId();
        return Result.ok(orderService.acceptOrder(param, userId));
    }