Returning LiveData from UseCases

[svc985]

Hello, This project was such an immense Clean Architecture learning tool for me. I'd like to ask what would be a way of returning LiveData from a use case, for example, returning LiveData<List<Movie>> from GetMovies use case and displaying it in MoviesFragment?

Thanks.

[Zhuinden]

I tend to return io.reactivex.Single from "use-case-like things", but I also instead observe the local data store for io.reactivex.Observable directly.

Not sure why you'd want to return LiveData from a usecase.

[Varsha-29]

LiveData is associated with the lifecycle of the activity/fragment and generally used between viewmodel - activity/fragment communication. To observe something in usecase, we could make use of coroutine's channels and flows. In the viewmodel, we could use Live data builder to wrap the flow into live-data https://proandroiddev.com/kotlin-flow-on-android-quick-guide-76667e872166

[Zhuinden]

UseCases shouldn't even be stateful. 🤔 That's why LiveData.onActive is powerful, although it'd allow you to lose results if you try to emit multiple events rather than just success/error.

But you don't need LiveData for a success/error.