Not really sure where this question should go. It's part compose/part threading/part coroutines. But...

# compose-android

[Colton Idle]

Not really sure where this question should go. It's part compose/part threading/part coroutines. But I'm putting it here.

Essentially I have a method in my viewModel that's called fun loadData() which hits the network then comes back and updates compose snapshot state. Works fine. Cool. Typically loadData is called from a LaunchedEffect.

BUT. Now I'm using a 3rd party sdk where it takes a lambda for initialization completion and so I want to move away from the LaunchedEffect and over to the sdk completion listener. So basically I call sdk.init( { viewModel.loadData() } ) . Cool. Everything still seems to work fine.

If I call loadData based on a compose launchedEffect and put a log in loadData() for Thread.current().name I get main. BUT after using the sdk.init() and passing the lamda in, I get a different thread entirely. Should I be worried about updating my compose snapshot state from Thread-29 (or w/e) instead of thread main?

[MR3Y]

I guess a safer bet here would be to update your snapshot state using Snapshot.withMutableSnapshot { ... } only if you're not on the main thread, https://kotlinlang.slack.com/archives/CJLTWPH7S/p1697173952963309?thread_ts=1697145056.766169&cid=CJLTWPH7S

[stojan]

you can convert your callback to a suspend function using: suspendCoroutine https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.coroutines/suspend-coroutine.html

then you end up with

suspend fun initAndLoadData() {
    sdk.awaitInit() // uses suspendCoroutine to convert from callback to suspend
    loadData()
}

[Zach Klippenstein (he/him) [MOD]]

Updating state from another thread is fine. If you’re updating more than a single state object, you may want to consider the above suggestion of using withMutableSnapshot to ensure all updates are seen by the main thread at the same time

[Colton Idle]

Updating state from another thread is fine

Cool. Is there a doc that points to that by any chance? Would like to share with my team vs just saying "Zach K says O.K." 😅

[Zach Klippenstein (he/him) [MOD]]

hm looking for it, found this at least 😅 https://issuetracker.google.com/234475017

[Zach Klippenstein (he/him) [MOD]]

this is the closest i’ve found so far https://developer.android.com/jetpack/compose/mental-model#frequent

[Colton Idle]

Thank you!