springboot单机秒杀-aop+锁

一：实现方式

　　1.aop+锁 （推荐）

　　2.queue队列

　1.之前我们说过，如果锁加在事务里，锁会有问题，建议锁上移，所以本次aop切面为controller层

　　

/**
 * 并发锁
 *
 * @author jiang
 */
@Documented
@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.METHOD)
public @interface ThreadLock {

    /**
     * 方法名
     *
     * @return
     */
    String method() default "";

}

/**
 * 锁切面
 *
 * @author jiang
 */
@Component
@Aspect
public class LockAspect {
    /**
     * 非公平锁
     */
    private static Lock lock = new ReentrantLock();

    @Pointcut("@annotation(club.dandelion.cloud.service.annotion.ThreadLock)")
    public void lockAspect() {

    }

    @Around("lockAspect()")
    public Object around(ProceedingJoinPoint joinPoint) {
        Object obj = null;
        lock.lock();
        try {
            obj = joinPoint.proceed();
        } catch (Throwable e) {
            e.printStackTrace();
        } finally {
            lock.unlock();
        }
        return obj;
    }
}

  @GetMapping("/startKill")
    @ThreadLock()
    public R startKill(String killId) {
        return seckillService.startKill(killId);
    }

@Override
    @Transactional(rollbackFor = Exception.class)
    public R startKill(String killId) {

        Seckill seckill = this.getOne(new LambdaQueryWrapper<Seckill>().eq(Seckill::getSeckillId, killId));
        int number = seckill.getNumber();
        if (number > 0) {
            Seckill seckill1 = seckill.setNumber(--number);
            this.update(seckill1, new LambdaQueryWrapper<Seckill>().eq(Seckill::getSeckillId, seckill.getSeckillId()));

            SuccessKilled successKilled = new SuccessKilled();
            successKilled.setCreateTime(new Date());
            successKilled.setSeckillId(Long.parseLong(killId));
            successKilled.setState(0);
            successKilledMapper.insert(successKilled);
            return R.ok();
        }
        return R.error("没有了！");

    }