Hi guys, I am very new to Kotlin coroutines and Fl...

# android

[Mohamed Fathy]

Hi guys,
I am very new to Kotlin coroutines and Flow and studying it now, I tried to achieve this behavior in Flow, but I am not able to do it unfortunately

fun <T> Single<Response<T>>.parseResponse(): Single<T> {
  return flatMap { response ->
    if (response.isSuccessful) {
      if (response.body() != null) Single.just(response.body()) else Single.error(NoDataException())
    } else {
      Single.error(DataRetrievingFailException())
    }
  }
}

This is extension written with RxJava that takes Single of Retrofit Response<Model> (Single<Response<Model>>) and check the state of it and then return Single<Model>
or error, This function supposed to be used in the data layer.

Thanks in advance.

[Mohamed Fathy]

Tried to do this but I get error because it now returns Flow<Any> instead Flow<T>

fun <T> Flow<Response<T>>.parseResponse(): Flow<T> {
  return map { response ->
    if (response.isSuccessful) {
      if (response.body() != null) response.body() else NoDataException()
    } else {
      DataRetrievingFailException()
    }
  }
}

Also tried this one and same return type error:

fun <T> Flow<Response<T>>.parseResponse(): Flow<T> {
  return flatMapConcat { response ->
    if (response.isSuccessful) {
      if (response.body() != null) flowOf(response.body()) else catch { emit(NoDataException()) }
    } else {
      catch { emit(DataRetrievingFailException()) }
    }
  }
}

Is it hard to achieve the same behaviour with flow or what?

[luke_c]

A regular suspend function would be a better replacement for a Single

[Mohamed Fathy]

Can you please show example?

[luke_c]

https://proandroiddev.com/modeling-retrofit-responses-with-sealed-classes-and-coroutines-9d6302077dfe

[Mohamed Fathy]

Thanks a lot