i’m a coroutine newbie and i’m stuck integrating co-routines and `CompletionStage` overall, my goal ...

# coroutines

[nfrankel]

i’m a coroutine newbie
and i’m stuck integrating co-routines and CompletionStage
overall, my goal is to check whether i’ve an entity in the cache
and if it’s not, go to the database
the cache-checking returns a CompletionStage
and the database repo is a suspending function
how can i combine the two?
the best i can do is:

val person = cache.getAsync(id).await()
return if (person == null) repository.findById(id)
else person

and obviously, it’s not the right way to do it
i don’t find the correct operator
help greatly appreciated 🙂

[jw]

Seems fine. I'd just clean up the Kotlin.

return cache.getAsync(id).await() ?: repository.findById(id)

[nfrankel]

thanks 🙂