is there maybe a way, to `suspend`, until `lateinit var` is initialized?

# getting-started

[Peter]

is there maybe a way, to suspend, until lateinit var is initialized?

[CLOVIS]

Not in an efficient way.

You could actively await the value, but that's not performant.

lateinit var foo: String

suspend fun await(): String {
    while (isActive) {
        if (this::foo.isInitialized)
            return foo
        delay(10)
    }
}

[CLOVIS]

If you can, it would be better to replace the lateinit var by a CompletableDeferred , but I don't think there is an API to check if it has finished yet?

Something like

class Foo(
    scope: CoroutineScope
) {
    val foo = scope.async {
        …
    }
}

and now you can foo.foo.await() .

[Peter]

Thanks for suggestions. I basically have some base class, that has an injected parameter. I kind of want to avoid constructor argument, since it would affect a lot of subclasses.

abstract class X @Inject constructor() {
    @Inject
    lateinit var y: Y
}

[Klitos Kyriacou]

Depending on your DI framework, your lateinit var probably won't get initialized asynchronously, but instead will be initialized in a well-defined and predictable order, so you may be able to know at a given point, that the variable will or will not have been initialized.