What’s the right way to hold a coroutine until a l...

# coroutines

[John]

What’s the right way to hold a coroutine until a listener is called? I.e. something like:

fun suspend getCar(): Car {
    val returnedCard
    fetcher.getCar({ car ->
       returnedCar = car 
    })
    // await while car is fetched ???
    return returnedCar
}

[Ruckus]

I think you want to look into suspendCoroutine and suspendCancellableCoroutine.

https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.coroutines/suspend-coroutine.html

https://kotlin.github.io/kotlinx.coroutines/kotlinx-coroutines-core/kotlinx.coroutines/suspend-cancellable-coroutine.html

[Pablichjenkov]

You may take a look to this S.O
https://stackoverflow.com/questions/48552925/existing-3-function-callback-to-kotlin-coroutines/48562175#48562175

[Ruckus]

There's also some information here: https://github.com/Kotlin/KEEP/blob/master/proposals/coroutines.md#wrapping-callbacks

[John]

Thanks!