Is it possible to add a `CoroutineContext.Element`...

# compose-web

[CLOVIS]

Is it possible to add a CoroutineContext.Element inside of Compose that would get passed down to all rememberCoroutineScope() created by Compose?

[Dima Avdeev]

If I correctly understand the question, you can pass argument to

rememberCoroutineScope(Job() + Dispatchers.Default)

[CLOVIS]

I mean, if you go that route, you have to specify it every time it is used.

I have a custom CoroutineContext object that I would like automatically injected into all rememberCoroutineScope() call without specifying it every time

[CLOVIS]

My (very limited) understanding is that Compose uses a CoroutineScope internally to trigger recomposition? Maybe rememberCoroutineScope inherits its context from there?

[Dima Avdeev]

Yes, rememberCoroutineScope based on context, created inside Compose.
But, I think, for now it is bot possible to add your own context to Compose hierarchy.

[Dima Avdeev]

I think one of the possible solutions is to create your own helper functions:
• Provide your own composition local property

val MyCoroutineContext = compositionLocalOf<CoroutineContext?>

• Provide this property on top of your App

CompositionLocalProvider(MyCoroutineContext provides Job("my additional context")) {
    //your top level Compose App
}

• Add your helper function to simpy use this providen context in amy place:

@Composable fun rememberCoroutineScopeWithMyOwnContext():CoroutineContext {
    rememberCoroutineScope(MyCoroutineContext.current)
}

After you can use rememberCoroutineScopeWithMyOwnContext() in any place you need.

[Dima Avdeev]

Here you can find more info
https://developer.android.com/jetpack/compose/compositionlocal

[efemoney]

I’m curious @CLOVIS, why would you want to do that?

[CLOVIS]

I have a Auth class that stores the user ID, to avoid having to explicitly pass it to all components in the app. As a workaround I'll just add a withContext in all the ClientService method, but I would have preferred if it were global

[CLOVIS]

Other use case: adding a generic CoroutineExceptionHandler as a last line of defense in case someone somewhere forgot to try-catch in a button or something, instead of the current behavior (crashing CfW until the app is restarted)

[Kapil Yadav]

@CLOVIS hey can u share this code for url like how to get bytecode from url

[CLOVIS]

@Kapil Yadav sorry, I don't understand your question