/// <summary>
/// 订阅
/// </summary>
/// <param name="subject">主题</param>
/// <param name="queueGroup">分组名称</param>
/// <param name="persistenceName">持久化名称</param>
/// <param name="subscribeOptions">订阅配置</param>
/// <param name="messageHandler">消息处理</param>
/// <returns></returns>
private async Task <STANSubscriptionConfig> InternalSubscribeAsync(
string subject,
string queueGroup,
string persistenceName,
STANSubscribeOptions subscribeOptions,
Func <STANSubscriptionConfig, SubscriptionMessageHandler> messageHandlerSetup)
{
var _channel = await ConnectAsync();
var SubscribePacket = new SubscribePacket();
_logger.LogDebug($"开始设置订阅消息队列收件箱 ReplyInboxId = {_replyInboxId}");
//订阅侦听消息
await _channel.WriteAndFlushAsync(SubscribePacket);
_logger.LogDebug($"结束设置订阅消息队列收件箱 ReplyInboxId = {_replyInboxId}");
var Packet = new SubscriptionRequestPacket(
_replyInboxId,
_config.SubRequests,
_clientId,
subject,
queueGroup,
SubscribePacket.Subject,
subscribeOptions.MaxInFlight ?? 1024,
subscribeOptions.AckWaitInSecs ?? 30,
persistenceName,
subscribeOptions.Position);
if (subscribeOptions.StartSequence.HasValue)
{
Packet.Message.StartSequence = subscribeOptions.StartSequence.Value;
}
if (subscribeOptions.StartTimeDelta.HasValue)
{
Packet.Message.StartTimeDelta = subscribeOptions.StartTimeDelta.Value;
}
//订阅配置信息
var SubscriptionConfig = new STANSubscriptionConfig(SubscribePacket.Id, subject, Packet.ReplyTo, Packet.Message.Inbox);
//订阅响应任务源
var SubscriptionResponseReady = new TaskCompletionSource <SubscriptionResponsePacket>(SubscriptionConfig);
//处理订阅响应的管道
var SubscriptionResponseHandler = new SubscriptionResponseHandler(SubscriptionConfig, SubscriptionResponseReady);
//添加订阅响应管道
_channel.Pipeline.AddLast(SubscriptionResponseHandler);
//订阅消息处理器
var messageHandler = messageHandlerSetup(SubscriptionConfig);
//添加消息处理到消息处理集合
_subscriptionMessageHandler.Add(messageHandler);
//订阅消息处理器添加到管道
_channel.Pipeline.AddLast(SubscribePacket.Id, messageHandler);
_logger.LogDebug($"开始发送订阅请求 包裹主题 {Packet.Subject } 订阅主题 {Packet.Message.Subject}");
//发送订阅请求
await _channel.WriteAndFlushAsync(Packet);
_logger.LogDebug($"结束发送订阅请求 包裹主题 {Packet.Subject } 订阅主题 {Packet.Message.Subject}");
//等待订阅结果响应
var SubscriptionResponseResult = await SubscriptionResponseReady.Task;
//移除处理订阅响应的管道
_channel.Pipeline.Remove(SubscriptionResponseHandler);
//如果订阅错误,同时移除订阅消息处理管道
if (!string.IsNullOrEmpty(SubscriptionResponseResult.Message.Error))
{
_channel.Pipeline.Remove(messageHandler);
_subscriptionMessageHandler.Remove(messageHandler);
_logger.LogError($"订阅消息发生异常 错误信息 {SubscriptionResponseResult.Message.Error}");
//TODO:待完善异常
throw new Exception(SubscriptionResponseResult.Message.Error);
}
_logger.LogDebug($"成功订阅消息 包裹主题 {Packet.Subject } 订阅主题 {Packet.Message.Subject}");
return(SubscriptionConfig);
}
