[WIP] Version 6.0 proposal

[SumeraMartin]

Seems like that with the adoption of Jetpack Compose, we started to use only cr-usecases and core packages and other packages are not actively used anymore. I think that the next step should be version 6.0.0 where we will remove unused packages and perform refactoring of the new ones.

interface UseCase<INPUT, OUTPUT> {

    suspend fun run(input: INPUT): OUTPUT
}

interface FlowUseCase<INPUT, OUTPUT> {

    fun <OUTPUT> create(input: INPUT): Flow<OUTPUT>
}

interface UseCaseExecutor {

    fun <INPUT, OUTPUT> UseCase<INPUT, OUTPUT>.execute(): OUTPUT
}

interface BetterUseCaseExecutor : UseCaseExecutor {

    fun <INPUT, OUTPUT> UseCase<INPUT, OUTPUT>.executeOnMainDispatcher(): OUTPUT
}

interface EventObserver {

    fun sendEvent(event: String)

    fun observeEvents(callback: (String) -> Unit)
}

class TestUseCase : UseCase<Int, String> {

    override suspend fun run(input: Int): String {
        return input.toString()
    }
}

class TestViewModel(
    private val testUseCase: TestUseCase,
    useCaseExecutor: UseCaseExecutor,
    eventObserver: EventObserver,
) : UseCaseExecutor by useCaseExecutor, EventObserver by eventObserver {

    fun test() {
        testUseCase.execute()

        sendEvent("")
    }
}