I wanted to achieve something like this: Have a qu...

# apollo-kotlin

[Stylianos Gakis]

I wanted to achieve something like this:
Have a query which does CacheAndNetwork.
If I do not get a valid value back from cache, okay continue with network.
If I again do not get a valid value back, delay some seconds, and then start all over again.

I previously had just CacheFirst and I did it with smth like this:

return flow {
 while (currentCoroutineContext().isActive) {
  val result = apolloClient.query()...
  when (result) {
   is Fail -> { delay(10.seconds) }
   is Success -> {
    emit(result...)
    break
   }
  }
 }
}

But since I am now expecting two emissions, I am having a hard time imagining how to do this. I can no longer delay on any "Fail" responses, the cache miss could be one for example which I want to just ignore in this case.

Any thoughts? Have you done smth like this before? My first idea was to try and hold some local var responseCount = 0 right inside the flow { block, and do ++ when I get a response, and set it back to 0 when the while loop loops, but I feel like I am making this more complicated than it should be.

[bod]

I think using CacheAndNetwork makes this more complicated and I'd probably continue doing what you did previously without it

[Stylianos Gakis]

Yeah I'd have to manually do a cache only and a network only then perhaps. Since the reason I am migrating this was specifically that we were showing some stale stuff from the cache and I wanted to also fetch from network after we get the quick cache response 😅
I'll try the two individual responses instead tomorrow!

[Stylianos Gakis]

Yup just did

return flow {
  apolloClient
    .query(..)
    .fetchPolicy(FetchPolicy.CacheOnly)
    .safeExecute()
    .onRight {
      emit(successvalue)
    }
  while (currentCoroutineContext().isActive) {
    val result = apolloClient
      .query(...)
      .fetchPolicy(FetchPolicy.NetworkOnly)
      .safeExecute()
    when (result) {
      Fail -> emit(fail); delay()
      Success -> emit(result); break
    }
  }
}

And it's all good. I wanted to get fancy with flow stuff but no need tbh 😄

[bod]

nice! 🎉