Stl.Fusion 알렉시아쿠닌과 스티브샌서든과의 대화

dimohy · 10월 21, 2021, 1:56오전

Blazor의 창시자인 스티브샌서든과 Stl.Fusion의 창조자인 알렉시아쿠닌의 대화는 흥미롭습니다.

Are the locks and ConfigureAwait calls needed?

opened 11:55AM - 08 Dec 20 UTC

closed 05:17AM - 11 Dec 20 UTC

This is a question rather than an issue, so apologies if this is the wrong way t…o post it. I was looking at the docs and samples and see a lot of places where they add `lock` statements and chain `ConfigureAwait(false)` onto tasks. Normally this isn't how I'd expect Blazor components to be authored, so wonder if you could clarify the reason. The typical advice we give is: * Don't use `ConfigureAwait(false)` in Blazor or any other .NET UI framework, because it means your code escapes from the UI framework's synchronization context. In the case of Blazor, this means the framework's exception handling logic will no longer work properly, and you could end up with unhandled exceptions that take down your entire server instance. While it's true that `ConfigureAwait(false)` provides an incredibly small perf benefit, the benefit is not significant and definitely isn't worth being in an unsupported scenario where there aren't any guarantees about error handling. * Note: for the same reason, don't use `.ContinueWith` anywhere, as that also behaves like `ConfigureAwait(false)`. Instead, make sure all tasks use `await` to go on to their continuation. * As long as you're not using `ConfigureAwait(false)`, the framework's synchronization context takes care of ensuring that only one thread at a time is processing your component's methods (within a single circuit). As such you no longer have to worry about using `lock` - you have the same simplified threading model as a JavaScript application, at least for instance methods on your components. It seems like there's an opportunity to simplify the samples, as well as fixing the error handling problems, by eliminating those things. Of course it's also possible that I'm misunderstanding something about how Stl.Fusion works and there are important reasons why those things are required. I'd be interested if this is something you could clarify. Thanks!