hi all, is this right way to declare dependency for coroutine dispatcher using KOIN , i'm worried ab...

# android

[althaf]

hi all, is this right way to declare dependency for coroutine dispatcher using KOIN , i'm worried about this as Dispatcher.IO and Dispatcher.Default are of same type while Main is of different type. This might be ambiguous

val diCoroutineModule = module {
    single { <http://Dispatchers.IO|Dispatchers.IO>  }
    single { Dispatchers.Main }
    single { Dispatchers.Default }
}

Something similar ins HILT

@InstallIn(SingletonComponent::class)
@Module
object CoroutinesModule {

    @DefaultDispatcher
    @Provides
    fun providesDefaultDispatcher(): CoroutineDispatcher = Dispatchers.Default

    @IoDispatcher
    @Provides
    fun providesIoDispatcher(): CoroutineDispatcher = <http://Dispatchers.IO|Dispatchers.IO>

    @MainDispatcher
    @Provides
    fun providesMainDispatcher(): CoroutineDispatcher = Dispatchers.Main

    @MainImmediateDispatcher
    @Provides
    fun providesMainImmediateDispatcher(): CoroutineDispatcher = Dispatchers.Main.immediate
}

[althaf]

val diUseCaseModule = module {
    factory { LoginUseCase(get(), dispatcher = <http://Dispatchers.IO|Dispatchers.IO>) }
}

else i will have to be explicit about the dispatcher in the UseCaseModule

[brandonmcansh]

im a fan of the following:

[brandonmcansh]

data class AppCoroutineDispatchers(
    val io: CoroutineDispatcher,
    val computation: CoroutineDispatcher,
    val main: CoroutineDispatcher
)

[brandonmcansh]

@Singleton
@Provides
fun provideCoroutineDispatchers() = AppCoroutineDispatchers(
    io = <http://Dispatchers.IO|Dispatchers.IO>,
    computation = Dispatchers.Default,
    main = Dispatchers.Main
)

[althaf]

Sorry for my ignorance, @brandonmcansh, the code you gave, is it KOIN ?

[brandonmcansh]

its Dagger, but could be applied the same i'd think. the core concept should be translatable

[brandonmcansh]

single { AppCoroutineDispatchers(io = .., computation = ..., main = ....) }

[althaf]

in Koin it is little bit different however .

[althaf]

val diUseCaseModule = module {
    factory { LoginUseCase(get(), dispatcher = get()) }
}

dependency get auto resolved just be this code

[brandonmcansh]

ah true, been a minute since I used koin

[althaf]

when i define this

val diCoroutineModule = module {
    single { <http://Dispatchers.IO|Dispatchers.IO>  }
    single { Dispatchers.Main }
    single { Dispatchers.Default }
}

it grammar is ambiguous as get() can resolve to IO and Default that is what i'm confused about

[althaf]

Login use case appears like this

class LoginUseCase(private val authRepository: AuthRepository, private val dispatcher: CoroutineDispatcher)

[brandonmcansh]

could you
interface IODispatcher: CoroutineDispatcher

[brandonmcansh]

and couple it w/ a factory

[brandonmcansh]

to create IODispatcher

[althaf]

hm, let me try, main intent here is id don't want to couple the nature of the dispatcher to the loginusecase constructor, it should be able to accept any CoroutineDispatcher. Only way to solve this is to declare the dependency explicitly, like this.

val diUseCaseModule = module {
    factory { LoginUseCase(get(), dispatcher = <http://Dispatchers.IO|Dispatchers.IO>) }
}

[brandonmcansh]

yeah I see where you're going

[brandonmcansh]

if you go the data class route and inject that, then your usecase can just do withContext(<http://dispatchers.io|dispatchers.io>) { }

[althaf]

i see

[kevindmoore]

val coroutines = module {
    single(named("Background")) { Dispatchers.Default}
    single(named("IO")) { <http://Dispatchers.IO|Dispatchers.IO>}
    single<CoroutineDispatcher> (named("Main")) { Dispatchers.Main}
}

[kevindmoore]

val mainDispatcher: CoroutineDispatcher by inject(named("Main"))
    val defaultDispatcher: CoroutineDispatcher by inject(named("Background"))

[brandonmcansh]

Ah nice didn't know koin had named support