Redis事务处理的使用操作方法

/*基于reids实现一个简单的多线程抢票操作
* 重点延时乐观锁的应用*/
public class SecondsKillDemo02 {
    //定义抢票逻辑
    public static void KillTicket() {
        //1.连接
        Jedis jedis = JedisDataSource.getConnection();
        //2.监控reids中指定的key
        String a = jedis.get("a");
        if (a == null || Integer.valueOf(a) == 0)
            throw new RuntimeException("没票了");
        jedis.watch("a", "b");
        //3.开启事务执行业务
        Transaction multi = jedis.multi();
        try {
            multi.decr("a");
            multi.incrBy("b", 100);
            //4.提交事务
             multi.discard();
            System.out.println("ok");
        } catch (Exception e) {
            multi.exec();
        } finally {
            //5.取消监控
            jedis.unwatch();
            //6.释放
            jedis.close();
        }
    }
 
    public static void main(String[] args) {
        //1.定义初始数据
        Jedis jedis = JedisDataSource.getConnection();
        jedis.set("a", "1");
        jedis.set("b", "0");
        //2.创建多个线程，在线程中执行抢票
        Thread t1 = new Thread(new Runnable() {
            @Override
            public void run() {
                KillTicket();
            }
        });
        Thread t2 = new Thread(new Runnable() {
            @Override
            public void run() {
                KillTicket();
            }
        });
        t1.start();
        t2.start();
 
    }
}