Comments (7)
Yeah I've wondered about this before...
Note that RACAsyncSubject
does behave slightly differently. It only sends the next
when it completes, whereas RACReplaySubject
sends them as it gets them.
I think the real value is the semantic difference between the two. RACAsyncSubject
says you're sending a single value. It's a promise or a future or whatever. Point being it's just one thing. RACReplaySubject
says you want to catch up anyone that missed anything, but still act like a stream. I think that difference communicated by different types is valuable.
I'd be interested in getting @xpaulbettsx's thoughts on this.
from reactivecocoa.
So, the only difference between them that should be there is that AsyncSubject
doesn't replay non-last items - with both of them, until it completes (i.e. when it's still "live"), they both just act like a normal Subject
. If you got rid of AsyncSubject
it probably would be fine. On .NET, AsyncSubject
has some additional secret-sauce to support the await
keyword, so it makes more sense that it is a separate class.
from reactivecocoa.
@joshaber The typical use case for RACAsyncSubject
seems to be network operations, which I think are absolutely better modeled as a stream, and not as a future.
I think the problem is that RACAsyncSubject
is somewhat fragile. If you send more than one value, suddenly the behavior of any subscribers becomes a lot less deterministic. I can't think of a case where I wouldn't want a RACReplaySubject
instead.
I think that difference communicated by different types is valuable.
It's worth noting that interfaces typically shouldn't expose whether a RACAsyncSubject
or RACReplaySubject
is being returned. Callers should just see a RACSubscribable
, and how it handles asynchronous behavior is either described in documentation, or an implementation detail.
from reactivecocoa.
Yeah good point 👍
from reactivecocoa.
FWIW, I'm going to do a pass through soon to do some housekeeping. I can remove RACAsyncSubject
and RACBehaviorSubject
when I do that.
from reactivecocoa.
🤘 Sounds good, though we should keep in mind that RACAsyncSubject
got some important concurrency fixes which RACReplaySubject
might not have.
from reactivecocoa.
✨ 👍
from reactivecocoa.
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