public Task Send(NotifyMessage message)
        {
            if (message == null)
            {
                throw new ArgumentNullException(nameof(message));
            }
            if (string.IsNullOrWhiteSpace(message.MessageType))
            {
                throw new ArgumentNullException(nameof(message), "message.messageType不能为空");
            }
            var messageType = message.MessageType;
            var setting     = _notifySettingStore.GetBy <NotifySettingBase>(messageType);

            if (setting == null)
            {
                throw new NotifyMessageException("找不到类型是:" + messageType + "的设置");
            }
            if (setting.Status == NotifySettingStatus.Normal)
            {
                message.StartSend();

                var task = setting.Send(message).ContinueWith(task =>
                {
                    var successSend = task.Result;
                    message.Sent(successSend);

                    _notifyMessageStore.Update(message);
                    _notifySettingStore.SaveChanged();

                    if (!successSend)
                    {
                        if (message.SendCount <= setting.MaxRetry + 1)
                        {
                            _queue.Add(message, DateTimeOffset.Now.AddSeconds(setting.RetrySpreadSeconds));
                        }
                        else
                        {
                            message.FailToSent();
                        }
                    }
                });


                return(task);
            }

            if (setting.Status == NotifySettingStatus.Pause)
            {
                _notifyMessageStore.Update(message);
                _notifySettingStore.SaveChanged();
            }

            return(Task.FromResult(0));
        }