I d like to make a fire and forget network call and don t wa kotlinlang #coroutines

suspend fun signOut() {
     coroutineScope {
         launch {
             makeNetworkRequest() // suspending function
         }
     }
     doSomethingElse()
}

octylFractal

05/13/2020, 3:24 AM

no, it will not --

coroutineScope

will suspend until the

launch

is finished

if you want to launch it and break structured concurrency, then you need to have some other external

CoroutineScope

to start it on, or as a last resort you can use

GlobalScope

if you would just like to run it in parallel with

doSomethingElse()

, but still wait for it to complete before

signOut()

finishes, then move

doSomethingElse()

inside the

coroutineScope

block

gregd

05/13/2020, 2:26 PM

@voben Why not try it yourself and see it with your own eyes?

https://play.kotlinlang.org/#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

The answer is “yes”. doSomethingElse() gets called before makeNetworkRequest() completes.

…if you put doSomethingElse() inside coroutineScope() 😉

Play around with it. It’s easy with Kotlin Playground

voben

05/13/2020, 2:33 PM

thanks @gregd

gregd

05/13/2020, 2:38 PM

No worries. And thanks @octylFractal too :)

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