package com.xiaojie.utils;
import org.springframework.stereotype.Component;
import redis.clients.jedis.Jedis;
import redis.clients.jedis.JedisPool;
import redis.clients.jedis.JedisPoolConfig;
/**
 * @ClassRedisPoolUtil
 * @Description jedispool连接工具
 * @AuthorAdministrator
 * @Date {Date}{Time}
 * @Version 1.0
 **/
@Component
public class RedisPoolUtil {
    private static String IP = "192.168.139.154";
    //Redis的端口号
    private static int PORT = 6379;
    //可用连接实例的最大数目，默认值为8；
    //如果赋值为-1，则表示不限制；如果pool已经分配了maxActive个jedis实例，则此时pool的状态为exhausted(耗尽)。
    private static int MAX_ACTIVE = 100;
    //控制一个pool最多有多少个状态为idle(空闲的)的jedis实例，默认值也是8。
    private static int MAX_IDLE = 20;
    //等待可用连接的最大时间，单位毫秒，默认值为-1，表示永不超时。如果超过等待时间，则直接抛出JedisConnectionException；
    private static int MAX_WAIT = 3000;
    private static int TIMEOUT = 3000;
    //在borrow一个jedis实例时，是否提前进行validate操作；如果为true，则得到的jedis实例均是可用的；
    private static boolean TEST_ON_BORROW = true;
    //在return给pool时，是否提前进行validate操作；
    private static boolean TEST_ON_RETURN = true;
    private static JedisPool jedisPool = null;
    /**
     * redis过期时间,以秒为单位
     */
    public final static int EXRP_HOUR = 60 * 60; //一小时
    public final static int EXRP_DAY = 60 * 60 * 24; //一天
    public final static int EXRP_MONTH = 60 * 60 * 24 * 30; //一个月
    /**
     * 初始化Redis连接池
     */
    private static void initialPool() {
        try {
            JedisPoolConfig config = new JedisPoolConfig();
            config.setMaxTotal(MAX_ACTIVE);
            config.setMaxIdle(MAX_IDLE);
            config.setMaxWaitMillis(MAX_WAIT);
            config.setTestOnBorrow(TEST_ON_BORROW);
            jedisPool = new JedisPool(config, IP, PORT, TIMEOUT, "xiaojie");
        } catch (Exception e) {
            //logger.error("First create JedisPool error : "+e);
            e.getMessage();
        }
    }
    /**
     * 在多线程环境同步初始化
     */
    private static synchronized void poolInit() {
        if (jedisPool == null) {
            initialPool();
        }
    }
    /**
     * 同步获取Jedis实例
     *
     * @return Jedis
     */
    public synchronized static Jedis getJedis() {
        if (jedisPool == null) {
            poolInit();
        }
        Jedis jedis = null;
        try {
            if (jedisPool != null) {
                jedis = jedisPool.getResource();
            }
        } catch (Exception e) {
            e.getMessage();
            // logger.error("Get jedis error : "+e);
        }
        return jedis;
    }
    /**
     * 释放jedis资源
     *
     * @param jedis
     */
    public static void returnResource(final Jedis jedis) {
        if (jedis != null && jedisPool != null) {
            jedisPool.returnResource(jedis);
        }
    }
    public static Long sadd(String key, String... members) {
        Jedis jedis = null;
        Long res = null;
        try {
            jedis = getJedis();
            res = jedis.sadd(key, members);
        } catch (Exception e) {
            //logger.error("sadd  error : "+e);
            e.getMessage();
        }
        return res;
    }
}

package com.xiaojie.lock;
import com.xiaojie.utils.RedisPoolUtil;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import redis.clients.jedis.Jedis;
import java.util.UUID;
/**
 * @author xiaojie
 * @version 1.0
 * @description: 基于redis实现分布式锁
 * @date 2021/9/19 21:17
 */
@Component
public class RedisDistributeLock {
    @Autowired
    private RedisPoolUtil redisPoolUtil;
    /**
     * @description:
     * @param: key 键值
     * @param: notLockTimeOut 为获取锁的等待时间
     * @param: timeOut 键值过期时间
     * @return: java.lang.String
     * @author xiaojie
     * @date: 2021/9/19 21:15
     */
    public String getLock(String key, Integer notLockTimeOut, Long timeOut) {
        Jedis jedis = redisPoolUtil.getJedis();
        //计算锁的超时时间
        Long endTime = System.currentTimeMillis() + notLockTimeOut;
        //当前时间比锁的超时时间小，证明获取锁时间没有超时，继续获取
        while (System.currentTimeMillis() < endTime) {
            String lockValue = UUID.randomUUID().toString();
            //如果设置成功返回1 获取到锁，如果返回0 获取锁失败，继续获取
            if (1 == jedis.setnx(key, lockValue)) {
                //设置键值过期时间,防止死锁
                jedis.expire(key, timeOut);
                return lockValue;
            }
        }
        //关闭连接
        try {
            if (jedis != null) {
                jedis.close();
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }
    /**
     * @description: 释放锁
     * @param: key
     * @return: boolean
     * @author xiaojie
     * @date: 2021/9/19 21:25
     */
    public boolean unLock(String key, String lockValue) {
        //获取Redis连接
        Jedis jedis = redisPoolUtil.getJedis();
        try {
            // 判断获取锁的时候保证自己删除自己
            if (lockValue.equals(jedis.get(key))) {
                return jedis.del(key) > 0 ? true : false;
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            if (jedis != null) {
                jedis.close();
            }
        }
        return false;
    }
}