Check if StreamSubscription is canceled

Question

To put it simple:

How do i check if a StreamSubscription is canceled?

There is no

_myCustomSub.isCanceled

Answer 1

It seems you'd have to use one of two methods:

1. onDone method - and retain in a seperate variable whether the stream was closed, or..
2. cancel method - and await the future that signals that the StreamSubscription was canceled.

Don't know of any other way.

Answer 2

I've run into a similar situation and my solution was to make my StreamSubscription nullable and set it to null after cancel().

await _newAlertsStreamSubscription?.cancel().then((_) {
     _newAlertsStreamSubscription = null;
});