PostListViewModel.kt

class PostListViewModel(
        val useCaseHandler: UseCaseHandler,
        val getposts: GetPosts,
        val savePost: SavePost): ViewModel() {


    fun getAllPosts(userId: Int, callback: PostDataSource.LoadPostsCallback) {
        val requestValue = GetPosts.RequestValues(userId)
        useCaseHandler.execute(getposts, requestValue, object : UseCase.UseCaseCallback<GetPosts.ResponseValue> {
            override fun onSuccess(response: GetPosts.ResponseValue) {
                callback.onPostsLoaded(response.posts)
            }

            override fun onError(t: Throwable) {
                callback.onError(t)
            }
        })
    }

    fun savePost(post: Post, callback: PostDataSource.SaveTaskCallback) {
        val requestValues = SavePost.RequestValues(post)
        useCaseHandler.execute(savePost, requestValues, object : UseCase.UseCaseCallback<SavePost.ResponseValue> {
            override fun onSuccess(response: SavePost.ResponseValue) {
                callback.onSaveSuccess()
            }
            override fun onError(t: Throwable) {
                callback.onError(t)
            }
        })
    }

}