data class LoadImageUseCaseRequest (
        val key: String,
        val storage: Storage,
        val imageFetcher: ImageFetcher
)

data class LoadImageUseCaseResponse (val bitmap: Bitmap)

class LoadImageUseCase : UseCase<LoadImageUseCaseRequest, LoadImageUseCaseResponse> {
    override fun handleRequest(request: LoadImageUseCaseRequest) : LoadImageUseCaseResponse {
        val url = request.storage.getUrlForKey(request.key)
        val image = request.imageFetcher.getImageFromUrl(url)
        return LoadImageUseCaseResponse(image)
    }
}

class Model {

    @Inject lateinit var useCaseRunner: UseCaseRunner<LoadImageUseCaseRequest, LoadImageUseCaseResponse>
    @Inject lateinit var imageFetcher : ImageFetcher
    @Inject lateinit var storage: Storage

    fun fetchUseCase(storageKey: String) {
        val request = LoadImageUseCaseRequest(storageKey, storage, imageFetcher)
        val useCase = LoadImageUseCase()
        useCaseRunner.runUseCase(useCase, request, object : UseCaseResponseHandler<LoadImageUseCaseResponse> {
            override fun handleResponse(response: LoadImageUseCaseResponse) {
                doSomthingWithResponse(response)
            }

        })
    }

    private fun doSomthingWithResponse(response: LoadImageUseCaseResponse) {
      ....
    }
}