hello I got a prototype bean that is created at runtime base kotlinlang #coroutines

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Title

d

Dariusz Kuc

04/11/2019, 5:54 AM

hello, I got a prototype bean that is created at runtime based on some input parameters. Within the prototype bean I got multiple methods that accept value (and some others that dont) that should be computed just once (as it is pretty expensive). Since I don't want to incur the initialization penalty if I'm not going to be calling a method that needs it I was using

by lazy

. I'm migrating now to coroutines was wondering whats the proper way to update

by lazy

to call suspendable function. Any thoughts on how to make this better?

m

Mark

06/07/2019, 6:31 AM

I’m also interested in this. Did you find out anything? Maybe of interest: https://github.com/Kotlin/kotlinx.coroutines/issues/745

d

Dariusz Kuc

06/07/2019, 1:48 PM

lazy delegation doesn't fit well into coroutine world

simplest equivalent is to just create lazy deferred, i.e.

async(start = CoroutineStart.LAZY)

and just await on it from the places

with the example above it would simply become

private val myDeferred = GlobalScope.async(start = CoroutineStart.LAZY) {
        someSuspendableFunction(valueFromRuntime)
    }
    
    suspend fun functionA() = myAnotherService.firstMethod(myDeferred.await())
    suspend fun functionB() = myAnotherService.secondMethod(myDeferred.await())

👍 1

*noted you probably want to create your own

CoroutineScope

instead of a global one

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