jedis实现分布式锁

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";

        /**
         * 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 tryLock(String lockKey, String requestId, int expireTime) {

            String result = invoke.set(lockKey, requestId, SET_IF_NOT_EXIST, SET_WITH_EXPIRE_TIME, expireTime);

            if (LOCK_SUCCESS.equals(result)) {
                return true;
            }
            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 unLock(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 = evalScript(script, Collections.singletonList(lockKey), Collections.singletonList(requestId));
            if (RELEASE_SUCCESS.equals(result)) {
                return true;
            }
            return false;
        }

        private Object evalScript(String script, List<String> singletonList, List<String> singletonList1) {
            return (invoke instanceof Jedis)
                    ? ((Jedis)invoke).eval(script, singletonList, singletonList1)
                    : ((JedisCluster)invoke).eval(script, singletonList, singletonList1);
        }