利用 Redis 队列操作的原子性实现秒杀

添加一个队列模拟商品列表

lpush productlist 1 2 3 4 5 6 7 8 9 10
1
利用多线程模拟 30 个人抢购这 10 件商品：

package demo;

import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

import redis.clients.jedis.Jedis;
import redis.clients.jedis.JedisPool;
import redis.clients.jedis.JedisPoolConfig;

/**
* @author qujianlei
* @date 2019年1月5日 下午2:49:11
* @description 通过Redis队列的原子操作实现秒杀
*/
public class RedisSpike {

public static void main(String[] args) {
// redis的队列操作是原子操作
// eg: 30个人抢10个商品
// lpush productlist 1 2 3 4 5 6 7 8 9 10 商品ID号
JedisPoolConfig jedisPoolConfig = new JedisPoolConfig();
jedisPoolConfig.setMaxIdle(10);
jedisPoolConfig.setMaxWaitMillis(10000);
jedisPoolConfig.setMaxTotal(1024);

JedisPool jedisPool = new JedisPool(jedisPoolConfig, "127.0.0.1", 6379);

ExecutorService executor = Executors.newFixedThreadPool(30);

for (int i = 0; i < 30; i++) {
executor.execute(new SpikeTask(i, jedisPool));
}

executor.shutdown();
}

}

class SpikeTask implements Runnable {

private int customerId;

private JedisPool jedisPool;

public SpikeTask (int customerId, JedisPool jedisPool) {
this.customerId = customerId;
this.jedisPool = jedisPool;
}

@Override
public void run() {

// 执行秒杀
Jedis client = jedisPool.getResource();

String productId = client.lpop("productlist");

if (productId != null && productId.length() != 0) {
System.out.println("顾客" + customerId + "抢到了" + productId + "号商品");
} else {
System.out.println("顾客" + customerId + "没有抢到商品");
}

}
}

参考文章：https://blog.csdn.net/a909301740/article/details/85853414