Something I haven't quite figured out that has bee...

# coroutines

[spierce7]

Something I haven't quite figured out that has been bothering me about the RendezvousChannel. The RendezvousChannel seems like a PublishSubject from RX, but the documentation says something that worries me: An element is transferred from sender to receiver only when send and receive invocations meet in time

So I understand that before I start listening to the Channel, all events emitted to it won't be received. Is it possible though that if I'm already listening to events on the Channel that I'll miss any?

[Vsevolod Tolstopyatov [JB]]

PublishSubject is rather ConflatedBroadcastChannel than RendezvousChannel. In RendezvousChannel element can be received only by one consumer.

RendezvousChannel documentation tries to say that sender is suspended until it meets the receiver. You can treat RendezvousChannel as suspending version of BlockingArrayQueue with zero capacity (java.util.TransferQueue actually).

[spierce7]

Isn't ConflatedBroadcastChannel more like a BehaviorSubject, as all subscribers immediately receive the current value upon subscription?

[spierce7]

Is there a BroadcastChannel that would provide the same behavior as PublishSubject, which is that all receivers are guaranteed to receive every item emitted after subscription, and all items emitted before subscription are lost to that receiver?

[David W]

I have been looking for this too

[David W]

This is what I've come up with so far, but I'm not 100% sure it's correct

[David W]

private val sender = BroadcastChannel<State>(Channel.CONFLATED)
        val broadcaster = sender.openSubscription().asPublisher()

[spierce7]

I don't think that answers my question. I'm interested to see how @Vsevolod Tolstopyatov [JB] responds.

[Vsevolod Tolstopyatov [JB]]

Yes, ConflatedBroadcastChannel is similar to BehaviorSubject (still can’t get used to *Subject terminology).

all receivers are guaranteed to receive every item emitted after subscription, and all items emitted before subscription are lost to that receiver?

This is plain BroadcastChannel.