Android LiveData gt Coroutines Probably you re aware of `NetworkBoundResource` from Google s app guide <https developer android com jetpack docs guide addendum> How do you replicate similar functionality in coroutines world Can you reuse it Do you apply some completely different technic Some thoughts Case 1 network request no caching required Before return `LiveData lt Resutl gt ` After probably just `suspended get Result` Seems enough `Error Success` no need for a stream here Case 2 network request return cache first update cache return fresh data Before return `NetworkBoundResource` as LiveData emits two items cached and refreshed After Channels Actors P S Does anybody have an example of cache aware Repository with coroutines

from Google's app guide: https://developer.android.com/jetpack/docs/guide#addendum. How do you replicate similar functionality in coroutines world? Can you reuse it? Do you apply some completely different technic? Some thoughts: Case 1: network request, no caching required: Before: return

LiveData<Resutl>()

After: probably just

suspended get(): Result

? Seems enough.

Error/Success

, no need for a stream here. Case 2: network request, return cache first, update cache, return fresh data Before: return

NetworkBoundResource

as LiveData (emits two items, cached and refreshed) After? Channels? Actors? (P.S. Does anybody have an example of cache aware Repository with coroutines? )

Dico

01/13/2019, 9:07 PM

An actor makes sense in this case.

gildor

01/14/2019, 8:02 AM

Not sure that actor is required, just a channel for second case, just a suspend function for the first

radityagumay

01/14/2019, 2:11 PM

@ghedeon since everything can be pararellism and sequential. You can check from cache first and do other stuff. In Rx world you can use concat(cache, remote)

ghedeon

01/14/2019, 4:13 PM

@radityagumay you're not wrong, but I can't see how it's related. You mean how to implement it inside of Repository? Because the question was more like how to pass it up, to presentation layer.

@gildor @Dico did you see some real examples of channels applied this way, by any chance? I'm afraid in the moment I switch to channel - I'll open the Pandora box 😬. The next day there will be the need to combine, map/reduce, subscribe/resubscribe, etc. and it will help me to know that I'm not alone here 🙂. I know all of this is possible, still don't see many people adopting. I've checked Chris Banes tivi app, after his talk at kotlinkonf, and he is mixing coroutines with rx

Flowable

. Still no channels..

Dico

01/14/2019, 4:29 PM

No. I would've brainstormed a solution if I had time today for that. Sorry

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