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Florian Schuster edited this page Mar 23, 2025 · 6 revisions

An EffectController is a Controller that additionally provides a Flow of Effect which represent a one-shot UI notification such as a Toast or a Snackbar on Android.

interface EffectController<Action, State, Effect> : Controller<Action, State> {
    val effects: Flow<Effect>
}

The effects Flow is received in a fan-out fashion, which means one emission can be collected by one collector only.

When creating an EffectController via CoroutineScope.createEffectController, Effects can be emitted from within Mutation-, Reducer- and all Transformer-contexts via emitEffect(Effect)

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