WarapperStateUsage.kt

MyRepositoryImplementation(...) : MyRepositoryInterface {
  ...
  private val _myData = MutableStateFlow<ApiState<MyConcreteModel>>(ApiState.Idle())
  
  override val myData: StateFlow<ApiState<MyConcreteModel>>
    get() = _myData
  
  override fun updateMyData() = someCoroutineScope.launch {
    try {
      _myData.value = ApiState.InWork(previousModel = null) // Instead of null you can contruct it with the previous model 
      val concreteDataModel = ..... // probably suspending function or some worker which will return the model
      _myData.value = if (concreteDataModel.isValid())
        ApiState.Success(model = concreteDataModel)
      else
        ApiState.Failure(
          apiError = ApiError(...), // Construct your error
          exception = null,
          id = SOME_CONSTANT_ID // for internal repository use. will be explained later.
        )
    } catch (e: Exception) {
      when (e) {
        is SomeException1,
        is SomeException2, ... -> {
          _myData.value = ApiState.Failure(
            apiError = null, // non-api error
            exception = e
            id = SOME_CONSTANT_ID // for internal repository use. will be explained later.
          )
        }
        else ->
          throw (e)
      }
    }
  }
}