Hello everybody I wished to ask about flows behaviour especi

Question

Hello everybody I wished to ask about flows behaviour especially in context of `MutableSharedFlow` what shared flow will do in case if nobody is listening for its stream As I understand currently all hot flows will throw out data when there are nobody to get it Or I missed something If not is there some built in flow which allow to prohibit trashing of data in case when nobody listetning that flow

y9san9 · Answer

You can specify the type of SharedFlow and make it lazy so it will be suspended at first emit until someone will subscribed slightly smiling face

y9san9 · Answer

probably you need to use `shareIn` and `SharingStarted Lazily` or buffer with onBufferOverflow = Suspend

Ovsyannikov Alexey · Answer

I will try but I am not pretty sure that it will work

Ovsyannikov Alexey · Answer

Thanks

y9san9 · Answer

I will make a little example in 20 minutes I m not at home now ok hand

y9san9 · Answer

Okay onBufferOverflow will have no effect without subscribers Can you please decribe your case so I can tell you if shareIn is usable here

Ovsyannikov Alexey · Answer

I think I should use `WhileSubscribed` instead of `SharingStarted Lazily` in my case

Ovsyannikov Alexey · Answer

Trying slightly smiling face

Ovsyannikov Alexey · Answer

It looks like almost what I need but there is a small problem replay of `shareIn` will replay data in each new subscriber I need next behaviour When there is at least one subscriber emit to all subscribers currently accumulated data When there are no any subscriber accumulate data Any sent data from flow must be removed and not repeated in any new subscribers

y9san9 · Answer

This is the idea of the replay slightly smiling face It should replay data when new subscriber comes

Ovsyannikov Alexey · Answer

i do not need replay I need to send accumulated data once to all available subscribers and then forget this data

y9san9 · Answer

For second point is it solution to `suspend` but not accumulate

Ovsyannikov Alexey · Answer

as I understand replay will keep data until that data will not be out of range of `replay` count parameter

y9san9 · Answer

and replay will keep this data and replay it for any new subscriber grin

Ovsyannikov Alexey · Answer

I do not need it when there is at least one subscriber slightly smiling face

Ovsyannikov Alexey · Answer

what I need is to accumulate data only when there are no any subscribers and clean any sent data

Adam Powell · Answer

What is the difference between losing an event because no subscribers were listening to a shared flow and losing an event because the right subscriber wasn t listening yet but some other subscriber was You re referring to sending accumulated data to all available subscribers when going from zero subscribers to not zero and releasing the accumulated data but that transition point will always be when that count goes from 0 1 not 0 2 or 0 30 and all subscribers after the first won t see the accumulated data Flows have no API for starting more than one subscription atomically