Got a question: - I have three `suspend` operatio...

# coroutines

[ildar.i [Android]]

Got a question:
- I have three suspend operations, each can be called independently:
foo1(list), foo2(list) and foo3(list)
- each function changes state of items in list
- foo1 just makes request to the server and returns updated list (updates 1 step)
- foo2 calls foo1 and then with combined result makes a request (updates 2 steps)
- foo3 calls foo2, combines result and makes a request (updates 3 steps)

Problem is, foo2 needs to gather data (SMS-code) via DialogFragment.
Is there a way to build a continuous pipeline, so the foo3 can continue its flow after foo2 called a dialog, gathered input and returned?

[elizarov]

Yes

[ildar.i [Android]]

that wasn't helpful😐

[elizarov]

Sorry, I’m not an Android developer, so I don’t know the specific code you should write. I just know it is possible, because you can always call suspendCancellableCoroutine { … } and then resume the coroutine on whatever callback you receive when the dialog had gathered input and returned. Alternatively, you can create a CompletableDeferred, open the dialog, and then call deferred.await() in your suspending function, arranging it so that you call deferred.complete(data) when you have some data from your dialog to be processed in the subsequent steps.

[ildar.i [Android]]

wow that's a lot of insight, thank you!

[gildor]

suspendCancellableCoroutine works fine for this use case, we have a suspending abstraction for dialogs in out project

[ildar.i [Android]]

How does it look like? I ended up with CompletableDeferred