RedisLock分布式redis锁

标签：catch   call   except   exist   release   时间   als   actor   distrib   

/**
 * 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;
}

}

RedisLock分布式redis锁

标签：catch   call   except   exist   release   时间   als   actor   distrib   

原文地址：https://blog.51cto.com/3131854/2423936