Redis 系列五之分布式锁

        #region ---分布式锁---

        /// 

        /// 加锁
        /// 
        /// 锁key
        /// 自己唯一标记
        /// 锁自动过期时间[默认10]（s）
        /// 等待锁时间（ms）
        /// 
        public bool Lock(string key, out string selfMark, int lockExpirySeconds = 10, long waitLockMilliseconds = 0)
        {
            DateTime begin = DateTime.Now;
            selfMark = Guid.NewGuid().ToString("N");//自己标记,释放锁时会用到,自己加的锁除非过期否则只能自己打开
            using (IRedisClient redisClient = GetClient())
            {
                string lockKey = "Lock_" + key;
                while (true)
                {
                    string script = string.Format("if redis.call('SETNX', KEYS[1], ARGV[1]) == 1 then redis.call('PEXPIRE',KEYS[1],{0}) return 1 else return 0 end", lockExpirySeconds * 1000);
                    //循环获取取锁
                    if (redisClient.ExecLuaAsInt(script, new[] { lockKey }, new[] { selfMark }) == 1)
                    {
                        return true;
                    }
                    //不等待锁则返回
                    if (waitLockMilliseconds == 0)
                    {
                        break;
                    }
                    //超过等待时间，则不再等待
                    if ((DateTime.Now - begin).TotalMilliseconds >= waitLockMilliseconds)
                    {
                        break;
                    }
                }
                return false;
            }
        }

        /// 

        /// 释放锁
        /// 
        /// 锁key
        /// 自己唯一标记
        public void UnLock(string key, string selfMark)
        {
            using (IRedisClient redisClient = GetClient())
            {
                string lockKey = "Lock_" + key;
                var script = "if redis.call('get', KEYS[1]) == ARGV[1] then return redis.call('del', KEYS[1]) else return 0 end";
                redisClient.ExecLuaAsString(script, new[] { lockKey }, new[] { selfMark });
            }
        }

        #endregion

            
            for (int i = 1; i <= 50; i++)
            {
                Task.Run(() =>
                {
                    Random random = new Random();
                    int userId = random.Next(1, 5);
                    string lock_key = "user_{0}";
                    string selfMark = string.Empty;
                    try
                    {
                        lock_key = string.Format(lock_key, userId);
                        //加锁
                        if (RedisUtil.Instance().Lock(lock_key, out selfMark, 10, 0))
                        {
                            //逻辑代码......



                            Thread.Sleep(100);
                        }
                    }
                    catch (Exception ex)
                    {
                        throw ex;
                    }
                    finally
                    {
                        //解锁
                        RedisUtil.Instance().UnLock(lock_key, selfMark);
                    }
                });
            }