redis分布式锁学习之路2-Redission实现分布式锁

<dependency>
    <groupId>org.redisson</groupId>
    <artifactId>redisson</artifactId>
    <version>3.6.5</version>
</dependency>

 

package com.hy.redis.controller;

import org.redisson.api.RLock;
import org.redisson.api.RedissonClient;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;

import javax.annotation.Resource;
import java.util.Objects;
import java.util.UUID;
import java.util.concurrent.TimeUnit;

/**
 * @author huheng
 * @date 2020/08/03
 **/
@Controller
public class DeductStockController1 {

    @Resource
    private RedissonClient redissonClient;
    @Resource
    private StringRedisTemplate stringRedisTemplate;

    @RequestMapping("/deduct-stock")
    @ResponseBody
    public String deductStock() {
        String lockKey = "lockKey";
        RLock lock = redissonClient.getLock(lockKey);
        try {
            lock.lock();
            
            // 读取库存
            Integer stock = Integer.parseInt(stringRedisTemplate.opsForValue().get("stock"));
            if (stock != null && stock > 0) {
                stringRedisTemplate.opsForValue().set("stock", stock - 1 + "");
                System.out.println("抢购成功--扣除库存成功" + "-----原库存:" + stock + "剩余库存:" + (stock - 1));
            }
            
        } finally {
            // 释放锁
            lock.unlock();
        }
        return "end";
    }
}