How to design a CoroutineScope that active when us...

# coroutines

[Simon Lin]

How to design a CoroutineScope that active when user login and cancel when user logout?

[Jason Ankers]

We recently did this by using a custom dagger component. Have a singleton manage the lifetime of the component and keep your CoroutineScope inside the component. Null the scope and cancel the coroutine as part of the logout process in your manager

[Simon Lin]

@Jason Ankers like to add CoroutineScope in UserManager?
https://medium.com/androiddevelopers/hilt-adding-components-to-the-hierarchy-96f207d6d92d

[Jason Ankers]

Yeah exactly like that article, keep your CoroutineScope in the component

[Jason Ankers]

UserManager doesn’t need to hold a reference to the scope, it can just grab it from the component and cancel when needed

[Simon Lin]

Do I need to implement cache strategy like `viewModelScope`and lifecyclescope in get() ?

class UserSessionCoroutineScope : CoroutineScope {
    override val coroutineContext: CoroutineContext = 
        SupervisorJob() + Dispatchers.Main.immediate
}

val UserSessionComponent.userSessionScope: CoroutineScope
    get() {
        return UserSessionCoroutineScope()
    }

[Jason Ankers]

I’m not sure the most correct way to do it, but in my case I didn’t use an extension property. I used a dagger module to provide the CoroutineScope and then just inject it normally

[Jason Ankers]

And I access the scope from my manager through an EntryPoint (we use Hilt)

[Simon Lin]

Got it! ty