Caching of Labels if no consumers

[badoo]

Caching of Labels if no consumers

[arkivanov]

Hello! Yes this might be a problem indeed. In such cases I suggest to use state instead. You can raise a flag in the state and when view will receive this it should first produce an event to dismiss this flag and then handle it. I understand that it is boilerplate but this is the proper way.

[Skeptick]

Yes, I know this way. Honestly, I always considered the need to handle one-time events through state to be the main disadvantage of the MVI pattern. Probably this method is correct for maintaining a state in a consistent form, and also allows to save a state in local storage. But... if events are not so important and do not affect the rest of the state, writing this boilerplate seems unnecessary.

I heard your point of view, thanks :) Perhaps you are right, I will think about it.

[arkivanov]

Yeah. If events are not so important it might be ok to miss them in such corner cases.

There is also a third (a bit hacky) way:

class OneOffValue<T: Any>(value: T) {
    private var value: T? = value

    fun get(): T? = value?.also { value = null }
}

data class MyState(
    val error: OneOffValue<String>? = null
)