redis分布式锁 的获取和释放

package com...;

import redis.clients.jedis.Jedis;

import java.util.Collections;

/**
 * @author 
 *
 */
public class JedisSuoUtils {

    private static final String LOCK_SUCCESS = "OK";
    private static final String SET_IF_NOT_EXIST = "NX";
    private static final String SET_WITH_EXPIRE_TIME = "PX";
    private static final Long RELEASE_SUCCESS = 1L;

    /**
     * 尝试获取分布式锁
     *
     * @param jedis      Redis客户端
     * @param lockKey    锁
     * @param requestId  请求标识
     * @param expireTime 超期时间, 单位毫秒
     * @return 是否获取成功
     */
    public static boolean tryGetDistributedLock(Jedis jedis, String lockKey, String requestId, int expireTime) {
        String result = jedis.set(lockKey, requestId, SET_IF_NOT_EXIST, SET_WITH_EXPIRE_TIME, expireTime);
        return LOCK_SUCCESS.equals(result);
    }

    /**
     * 释放分布式锁
     *
     * @param jedis     Redis客户端
     * @param lockKey   锁
     * @param requestId 请求标识
     * @return 是否释放成功
     */
    public static boolean releaseDistributedLock(Jedis jedis, String lockKey, String requestId) {

        String script = "if redis.call('get', KEYS[1]) == ARGV[1] then return redis.call('del', KEYS[1]) else return 0 end";
        Object result = jedis.eval(script, Collections.singletonList(lockKey), Collections.singletonList(requestId));

        return result.equals(RELEASE_SUCCESS);

    }
}

package com.wondersgroup.redis.redisSuo;
import redis.clients.jedis.Jedis;
import java.util.Collections;
/** * @author  * @date 2018/4/9 */public class JedisSuoUtils {
    private static final String LOCK_SUCCESS = "OK";    private static final String SET_IF_NOT_EXIST = "NX";    private static final String SET_WITH_EXPIRE_TIME = "PX";    private static final Long RELEASE_SUCCESS = 1L;
    /**     * 尝试获取分布式锁     *     * @param jedis      Redis客户端     * @param lockKey    锁     * @param requestId  请求标识     * @param expireTime 超期时间, 单位毫秒     * @return 是否获取成功     */    public static boolean tryGetDistributedLock(Jedis jedis, String lockKey, String requestId, int expireTime) {        String result = jedis.set(lockKey, requestId, SET_IF_NOT_EXIST, SET_WITH_EXPIRE_TIME, expireTime);        return LOCK_SUCCESS.equals(result);    }
    /**     * 释放分布式锁     *     * @param jedis     Redis客户端     * @param lockKey   锁     * @param requestId 请求标识     * @return 是否释放成功     */    public static boolean releaseDistributedLock(Jedis jedis, String lockKey, String requestId) {
        String script = "if redis.call('get', KEYS[1]) == ARGV[1] then return redis.call('del', KEYS[1]) else return 0 end";        Object result = jedis.eval(script, Collections.singletonList(lockKey), Collections.singletonList(requestId));
        return result.equals(RELEASE_SUCCESS);
    }}

标签：return,String,redis,param,获取,jedis,requestId,lockKey,分布式
来源： https://www.cnblogs.com/lifan12589/p/13502036.html