Returns true
if subscription has been explicitly cancelled, false
otherwise.
The query that the subscription is based on.
The name of the collection that the subscription is based on.
Cancels a subscription and releases all associated resources.
Used to subscribe to receive updates from remote peers about matching documents.
While Subscription objects remain in scope they ensure that documents in the collection specified and that match the query provided will try to be kept up-to-date with the latest changes from remote peers.