RedisLock分布式redis锁

@Component
public class RedisLock {
Logger logger= LoggerFactory.getLogger(RedisLock.class);
private static final String LOCK_SUCCESS = "OK";
private static final String SET_IF_NOT_EXIST = "NX";//NX是毫秒，EX是秒
private static final String SET_WITH_EXPIRE_TIME = "PX";

/**
 * 尝试获取分布式锁
 * @param lockKey 锁
 * @param requestId 请求标识
 * @param expireTime 超期时间
 * @return 是否获取成功
 */
public boolean tryGetDistributedLock(String lockKey, String requestId, int expireTime) {
    Jedis jedis=null;
    try{
        jedis = Const.jedisPoolCommon.getResource();
        String result =jedis.set(lockKey, requestId, SET_IF_NOT_EXIST, SET_WITH_EXPIRE_TIME, expireTime);
        if (LOCK_SUCCESS.equals(result)) {
            return true;
        }
    }catch (Exception ex){
        logger.error("tryGetDistributedLock异常"+ex);
    }finally {
        if(jedis!=null){
            jedis.close();
        }
    }
    return false;
}
private static final Long RELEASE_SUCCESS = 1L;

/**
 * 释放分布式锁
 * @param lockKey 锁
 * @param requestId 请求标识
 * @return 是否释放成功
 */
public boolean releaseDistributedLock( String lockKey, String requestId) {
    Jedis jedis = null;
    try{
        jedis=Const.jedisPoolCommon.getResource();
        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));
        if (RELEASE_SUCCESS.equals(result)) {
            return true;
        }
    }catch (Exception ex){
        logger.error("releaseDistributedLock异常"+ex);
    }finally {
        if(jedis!=null){
            jedis.close();
        }
    }
    return false;
}

}

标签：return,String,redis,param,jedis,RedisLock,lockKey,requestId,分布式
来源： https://blog.51cto.com/3131854/2423936