how to make this call parallel where `init` and `getLastStat kotlinlang #coroutines

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Title

k

Kulwinder Singh

11/04/2018, 9:47 AM

how to make this call parallel , where

init

and

getLastState

are

suspend

function ?

How_to_do_parallel__.kt

l

louiscad

11/04/2018, 9:52 AM

I'd fix the indentation and add a question mark since it's a question. Does the second call work if you remove the first one? If no, then you can't make it parallel by definition. Otherwise, you can just use

async

and

await

.

k

Kulwinder Singh

11/04/2018, 9:55 AM

yes, second call not depend on first one and works without it

then how to do ?, i want to do both calls in parallel

is it right way ? ->

async { musicProvider.init() }.await()
val lastState = async { musicProvider.getLastState() }.await()

l

louiscad

11/04/2018, 10:10 AM

If you await before starting the other, it's on longer parallel, and the IDE should warn you BTW.

With a single async block, you can do this:

val lastStateAsync = async { musicProvider.getLastState() }
musicProvider.init()
val lastState = lastStateAsync.await()

d

Daniel Tam

11/04/2018, 10:50 AM

listOf(
  async { ... },
  async { ... }
).awaitAll()

Louis' is probably nicer since it doesn't allocate a list, and since you only want the result of

getLastState

, and since async calls now work intuitively with their parent scope if they throw

b

bdawg.io

11/04/2018, 11:04 PM

Do you need the result of

init

? (By result I mean was there an exception). If not, just launch that and then use

getLastState

directly

uiScope.launch {
    launch { runCatching { musicProvider.init() } }
    val lastState = musicProvider.getLastState()
    ...
}

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