subscribe<T> method
Adds to the center a subscriber for notificationId
.
The returned NotificationSubscription can be used to pause/resume or cancel the subscription.
Implementation
NotificationSubscription subscribe<T>(
String notificationId, void Function(T) callback) {
if (!_notifications.containsKey(notificationId)) {
_notifications[notificationId] = [];
}
final subscriber = NotificationSubscriber<T>(callback);
subscriber.onCancel = () {
_notifications[notificationId]?.remove(subscriber);
};
_notifications[notificationId]?.add(subscriber);
return subscriber;
}