使用反应式扩展以正确的顺序处理多个响应

情况

我有一个系统，其中一个请求会产生两个响应。请求和响应有相应的可观察量：

IObservable<RequestSent> _requests;
IObservable<MainResponseReceived> _mainResponses;
IObservable<SecondResponseReceived> _secondaryResponses;

可以保证RequestSent事件发生早于MainResponseReceived and SecondaryResponseReceived但响应的顺序是随机的。

我拥有的

最初我想要处理这两个响应的处理程序，所以我压缩了可观察量：

_requests
    .SelectMany(async request =>
    {
        var main = _mainResponses.FirstAsync(m => m.Id == request.Id);
        var secondary = _secondaryResponses.FirstAsync(s => s.Id == request.Id);

        var zippedResponse = main.Zip(secondary, (m, s) => new MainAndSecondaryResponseReceived {
            Request = request,
            Main = m, 
            Secondary = s
        });
        return await zippedResponse.FirstAsync(); ;
    })
    .Subscribe(OnMainAndSecondaryResponseReceived);

我需要的

现在我还需要处理MainResponseReceived无需等待 secondaryResponseRecieved，并且必须保证 OnMainResponseRecieved 在之前完成OnMainAndSecondaryResponseReceived叫做

请问这两个订阅如何定义？

测试用例1：

1. RequestSent occurs
2. MainResponseReceived发生 -> OnMainResponseReceived 被调用
3. SecondaryResponseReceived 发生 -> OnMainAndSecondaryResponseReceived 被调用

测试案例2：

1. RequestSent occurs
2. SecondaryResponseReceived occurs
3. MainResponseReceived occurs-> OnMai ResponseReceived 被调用 -> OnMainAnd secondary ResponseReceived 被调用

我认为你几乎走在正确的轨道上。我不会再摆弄所有异步的东西 - 这只会让事情变得复杂。

尝试这个查询：

var query =
    _requests
        .SelectMany(request =>
            _mainResponses.Where(m => m.Id == request.Id).Take(1)
                .Do(m => OnMainResponseReceived(m))
                .Zip(
                    _secondaryResponses.Where(s => s.Id == request.Id).Take(1),
                    (m, s) => new MainAndSecondaryResponseReceived()
                    {
                        Request = request,
                        Main = m, 
                        Secondary = s
                    }));

var subscription =
    query.Subscribe(x => OnMainAndSecondaryResponseReceived(x));

The .Do(...)是代码中重要的缺失部分。它确保OnMainResponseReceived之前被调用OnMainAndSecondaryResponseReceived无论主要响应还是次要响应先出现。

我对此进行了测试：

Subject<RequestSent> _requestsSubject = new Subject<RequestSent>();
Subject<MainResponseReceived> _mainResponsesSubject = new Subject<MainResponseReceived>();
Subject<SecondResponseReceived> _secondaryResponsesSubject = new Subject<SecondResponseReceived>();

IObservable<RequestSent> _requests = _requestsSubject.AsObservable();
IObservable<MainResponseReceived> _mainResponses = _mainResponsesSubject.AsObservable();
IObservable<SecondResponseReceived> _secondaryResponses = _secondaryResponsesSubject.AsObservable();

_requestsSubject.OnNext(new RequestSent() { Id = 42 });
_mainResponsesSubject.OnNext(new MainResponseReceived() { Id = 42 });
_secondaryResponsesSubject.OnNext(new SecondResponseReceived() { Id = 42 });

_requestsSubject.OnNext(new RequestSent() { Id = 99 });
_mainResponsesSubject.OnNext(new MainResponseReceived() { Id = 99 });
_secondaryResponsesSubject.OnNext(new SecondResponseReceived() { Id = 99 });