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sealed class State<out T> { | |
class Loading<out T> : State<T>() | |
data class Success<out T>(val data: T) : State<T>() | |
data class Failed<out T>(val message: String) : State<T>() | |
} |
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@ExperimentalCoroutinesApi | |
class PostRepository { | |
fun getPostData(): Flow<State<PostModel>> = callbackFlow { | |
offer(State.Loading()) | |
val postDocument = Firebase.firestore | |
.collection(AppConfig.POSTS_COLLECTION) | |
.document("post1") | |
val subscription = postDocument.addSnapshotListener { snapshot, exception -> | |
exception?.let { |
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@ExperimentalCoroutinesApi | |
class PostViewModel(private val repo: PostRepository) : ViewModel() { | |
fun getPost() = repo.getPostData() | |
} |
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CoroutineScope(Dispatchers.Main).launch { | |
loadPost() | |
} | |
private suspend fun loadPost() { | |
viewModel.getPost().collect { | |
when (it) { | |
is State.Loading -> { | |
Timber.i("LOADING") | |
} |