public async Task <ClientEntity> GetClientByIdAsync(int clientId)
        {
            var key          = GetCacheKey(clientId);
            var clientEntity = await _redisCache.GetAsync <ClientEntity>(key);

            if (clientEntity != null)
            {
                return(clientEntity.ClientId == -1 ? null : clientEntity);
            }

            var expiry = TimeSpan.FromSeconds(5);
            var wait   = TimeSpan.FromSeconds(5);
            var retry  = TimeSpan.FromSeconds(1);

            using (var redLock = await _redisCache.CreateLockAsync(key, expiry, wait, retry))
            {
                if (!redLock.IsAcquired)
                {
                    return(null);
                }

                clientEntity = await _redisCache.GetAsync <ClientEntity>(key);

                if (clientEntity?.ClientId != -1)
                {
                    return(clientEntity);
                }

                clientEntity = await _clientRepository.TableNoTracking.FirstOrDefaultAsync(c => c.ClientId == clientId);

                if (clientEntity != null)
                {
                    await _redisCache.AddAsync(key, clientEntity);
                }
                else
                {
                    //防止不存在的clientId频繁访问数据库
                    await _redisCache.AddAsync(key, new ClientEntity { ClientId = -1 }, expiry : TimeSpan.FromMinutes(15));
                }
            }

            return(clientEntity);
        }