RedisTemplate分布式锁的实现(加锁/解锁)

1、话不多说 直接贴代码

 

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.core.script.DefaultRedisScript;
import org.springframework.data.redis.core.script.RedisScript;
import org.springframework.stereotype.Component;
import java.util.Collections;
import java.util.concurrent.TimeUnit;


/**
 * @author wzm
 * @email [e-mail]
 * @date 2020/07
 */
@Component
public class RedisLock {

    @Autowired
    private RedisTemplate redisTemplate;


    private static final Long SUCCESS = 1L;
    private long timeout = 9999; //获取锁的超时时间



    /**
     * 加锁，无阻塞
     *
     * @param
     * @param
     * @return
     */
    public Boolean tryLock(String key, String value, long expireTime) {


        Long start = System.currentTimeMillis();
        try{
            for(;;){
                //SET命令返回OK ，则证明获取锁成功
                Boolean ret = redisTemplate.opsForValue().setIfAbsent(key, value, expireTime, TimeUnit.SECONDS);
                if(ret){
                    return true;
                }
                //否则循环等待，在timeout时间内仍未获取到锁，则获取失败
                long end = System.currentTimeMillis() - start;
                if (end>=timeout) {
                    return false;
                }
            }
        }finally {

        }

    }


    /**
     * 解锁
     *
     * @param
     * @param
     * @return
     */
    public Boolean unlock(String key, String value) {
        String script = "if redis.call('get', KEYS[1]) == ARGV[1] then return redis.call('del', KEYS[1]) else return 0 end";

        RedisScript<String> redisScript = new DefaultRedisScript<>(script, String.class);

        Object result = redisTemplate.execute(redisScript, Collections.singletonList(key),value);
        if(SUCCESS.equals(result)) {
            return true;
        }

        return false;
    }
}

 

本文地址：https://blog.csdn.net/wang6596639/article/details/107662232