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package com.paic.phucp.console.djss;
import com.paic.phucp.common.utils.RedisUtil;
import org.springframework.stereotype.Component;
import redis.clients.jedis.JedisCluster;
import java.util.Collections;
/**
* 第一个为key，我们使用key来当锁名
* 第二个为value，传的是uid，唯一随机数，也可以使用本机mac地址 + uuid
* 第三个为NX，意思是SET IF NOT EXIST，即当key不存在时，我们进行set操作；若key已经存在，则不做任何操作
* 第四个为PX，意思是我们要给这个key加一个过期的设置，具体时间由第五个参数决定 第五个为time，代表key的过期时间，对应第四个参数
PX毫秒，EX秒
* */
@Component
public class LockImpl {
public boolean lock(String lockId, String lockValue, int timeoutInSeconds)
{
JedisCluster jedisCluster = RedisUtil.getJedisCluster();
String result = jedisCluster.set(lockId, lockValue, "NX", "EX",
timeoutInSeconds);
return "OK".equals(result);
}
public boolean unlock(String lockId, String lockValue) {
JedisCluster jedisCluster = RedisUtil.getJedisCluster();
String script = "if redis.call('get', KEYS[1]) == ARGV[1] then return
redis.call('del', KEYS[1]) else return 0 end";
Object result = jedisCluster.eval(script,
Collections.singletonList(lockId), Collections.singletonList(lockValue));
return (result instanceof Long) && ((Long) result).longValue() == 1;
}
}
