close method
Implementation
Future<void> close() async {
final state = stateSubject.value;
try {
await Future.wait<dynamic>([
if (state is TopicSubscriptionSubscribed)
for (final sub in state.registeredSubscriptions)
sub.controller.close(),
stateSubject.close(),
]);
_isClosed = true;
} catch (err, st) {
_logger.shout('Could not cloes a topic subscription: $this', err, st);
_isClosed = false;
}
}