全栈式实战J9，打通从零基础到独立架构的技术闭环

@Slf4j

@Service

public class SecKillOrderServiceImpl implements SecKillOrderService {

// J9工程规范：基于 Lua 脚本与 Redis 分布式锁保障高并发原子性扣减

private final RedissonClient redissonClient;

private final OrderMessageProducer orderProducer;

@Transactional(rollbackFor = Exception.class)

public OrderResult executeSecKill(Long userId, Long skuId) {

RLock lock = redissonClient.getLock(RedisKeyPrefix.SECKILL_LOCK + skuId);

if (!lock.tryLock(100, 3000, TimeUnit.MILLISECONDS)) {

throw new BusinessException(ErrorCode.SYSTEM_BUSY);

}

// 异步投递削峰消息队列，保障毫秒级接口响应

orderProducer.sendOrderCreateMessage(new OrderEvent(userId, skuId));

return OrderResult.success("秒杀排队中，正在极速下单...");

}

}