Is there any way to get child's coroutineContext e...

# coroutines

[Krzysiek Zgondek]

Is there any way to get child's coroutineContext elements of a scope job? ie. lets say i have a scope: scope: CoroutineScope and i have launched a job in that scope:

val context = Dispatchers.Default + CoroutineActionId(id)
val newJob= scope.launch(context) { ... }

given that CoroutineActionId(id) is an AbstractCoroutineContextElement how can i reach it having only scope ?
I've tried like this:

val children = scope.coroutineContext[Job]?.children
val activeAction = children?.firstOrNull { it[CoroutineActionId]?.id == id }
if (activeAction != null) {
    activeAction.cancelChildren()
    activeAction.join()
}

but after debugging i've realized that children of scope's Job are different than jobs refs returned from launch but the amount is correct. It looks like i see actual job on scope's val children = scope.coroutineContext[Job]?.children list but when i try to get CoroutineActionId like this

children?.forEach {
     println("#state: caid = "  + it[CoroutineActionId]?.id)
}

it doesn't exist

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

Jobs don’t know about any other context elements, at least not via public api. And jobs are the only part of the coroutine context that actually form a hierarchy.

[Krzysiek Zgondek]

can i tag / give an additional field (of some kind) to a job so i can identify it later using a scope i've started it with ?

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

Kotlin in general (and Java) don’t let you add fields to objects at runtime

[Krzysiek Zgondek]

i mean in a way you can currently create coroutineContext element