Is there any better way to wrap this function in Caffeine Ca kotlinlang #coroutines

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Title

d

dave08

07/28/2019, 2:47 PM

Is there any better way to wrap this function in Caffeine Cache:

suspend fun <K: Any, V> AsyncCache.getSuspending(key: K): V {
    val outerContext = coroutineContext
    return get(key) { k, executor ->
        val innerContext = outerContext + Job() + executor.asCoroutineDispatcher()
        CoroutineScope(innerContext).async {
            loadValue(k) // loadValue is a suspend function defined elsewhere
        }.asCompletableFuture()
    }.await()
}

d

Dominaezzz

07/28/2019, 2:58 PM

suspend fun <K: Any, V> AsyncCache.getSuspending(key: K): V {
    val outerContext = coroutineContext
    return get(key) { k, executor ->
        val innerContext = outerContext + Job() + executor.asCoroutineDispatcher()
        GlobalScope.async(innerContext) {
            loadValue(k) // loadValue is a suspend function defined elsewhere
        }.asCompletableFuture()
    }.await()
}

or even better,

suspend fun <K: Any, V> AsyncCache.getSuspending(key: K): V {
    val outerContext = coroutineContext
    return get(key) { k, executor ->
        val innerContext = outerContext + Job() + executor.asCoroutineDispatcher()
        GlobalScope.future(innerContext) {
            loadValue(k) // loadValue is a suspend function defined elsewhere
        }
    }.await()
}

d

dave08

07/28/2019, 3:00 PM

But then I loose the parent-child Job relationship (since we're using

GlobalScope

)? Or did I misunderstand?

Unless providing

innerContext

does the same?

d

Dominaezzz

07/28/2019, 3:01 PM

Constructing a

CoroutineScope

without explicitly cancelling it is the same as

GlobalScope

. Might as well save the allocation.

👌🏼 1

Yeah, what you said.

d

dave08

07/28/2019, 3:05 PM

Thanks!

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