I’d like to make a fire and forget network call, a...

# coroutines

[voben]

I’d like to make a fire and forget network call, and don’t want to wait for the response. Will doSomethingElse() get called before the network call completes? How could I improve this?

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

[octylFractal]

no, it will not -- coroutineScope will suspend until the launch is finished

[octylFractal]

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

[octylFractal]

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]

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

[gregd]

https://play.kotlinlang.org/#eyJ2ZXJzaW9uIjoiMS4zLjQxIiwicGxhdGZvcm0iOiJqYXZhIiwiYXJncyI6IiIsImpzQ29kZSI6IiIsIm5vbmVNYXJrZXJzIjp0cnVlLCJ0aGVtZSI6ImlkZWEiLCJjb2RlIjoiLyoqXG4gKiBZb3UgY2FuIGVkaXQsIHJ1biwgYW5kIHNoYXJlIHRoaXMgY29kZS4gXG4gKiBwbGF5LmtvdGxpbmxhbmcub3JnIFxuICovXG5cbmltcG9ydCBrb3RsaW54LmNvcm91dGluZXMuKlxuaW1wb3J0IGphdmEudXRpbC4qXG5cbmZ1biBtYWluKCkgPSBydW5CbG9ja2luZyB7XG4gICAgc2lnbk91dCgpXG59XG5cbnN1c3BlbmQgZnVuIHNpZ25PdXQoKSA9IGNvcm91dGluZVNjb3BlIHtcbiAgICAgbGF1bmNoIHtcbiAgICAgICAgIHByaW50bG4oXCIke1N5c3RlbS5jdXJyZW50VGltZU1pbGxpcygpfSBtYWtlTmV0d29ya1JlcXVlc3QgYmVnaW5cIilcbiAgICAgICAgIGRlbGF5KDJfMDAwKVxuICAgICAgICAgcHJpbnRsbihcIiR7U3lzdGVtLmN1cnJlbnRUaW1lTWlsbGlzKCl9IG1ha2VOZXR3b3JrUmVxdWVzdCBlbmRcIilcbiAgICAgfVxuICAgICBwcmludGxuKFwiJHtTeXN0ZW0uY3VycmVudFRpbWVNaWxsaXMoKX0gZG9Tb21ldGhpbmdFbHNlXCIpXG59In0=

[gregd]

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

[gregd]

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

[gregd]

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

[voben]

thanks @gregd

[gregd]

No worries. And thanks @octylFractal too :)