someAsyncJobHere not to cancel the outer coroutine how would kotlinlang #coroutines

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myanmarking

08/22/2019, 1:07 PM

someAsyncJobHere not to cancel the outer coroutine. how would i define such function ?

kingsley

08/22/2019, 1:12 PM

You can use launch/async or most of the other existing coroutine builders depending on which one suits your needs:

fun CoroutineScope.someAsyncJobHere() = launch {
  // some code
}

This function returns a

Job

that you can then cancel (or not) later

myanmarking

08/22/2019, 1:13 PM

yes, but if i cancel the job, won't it cancel the rest of the execution inside main.launch ?

please check edited code sample, i don't want it to cancel suspendFunc3

fun startStepsSync(): CoroutineScope {
        val scope = CoroutineScope(Dispatchers.Main)
        scope.launch { 
            // something here
        }
        return scope
    }

would canceling this job also cancel the mainScope?

louiscad

08/22/2019, 1:34 PM

Just test it, it'll improve your understanding. Spoiler: canceling a child coroutine doesn't cancel the parent. Crashing a child coroutine does cancel the parent (a non

CancellationException

myanmarking

08/22/2019, 1:36 PM

ya, thanks

in that case, i don't need the inner scope at all, right ?

louiscad

08/22/2019, 1:41 PM

If you don't seem to need it, then you probably don't.

streetsofboston

08/22/2019, 2:24 PM

@myanmarking https://medium.com/the-kotlin-chronicle/coroutine-exceptions-3378f51a7d33 and look for the “CancellationException” section.

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