unsubscribe method

@override void unsubscribe(String channelName)

Unsubscribes from channelName, closing its local broadcast controller and sending an unsubscribe frame to the server if connected.

Implementation

@override
void unsubscribe(String channelName) {
  final wasSubscribed = _desiredSubscriptions.remove(channelName);
  final hadPresence = _desiredPresenceJoins.remove(channelName) != null;
  _presenceStore.remove(channelName);

  if (isConnected && (wasSubscribed || hadPresence)) {
    send(RealtimeMessage.unsubscribe(channelName));
  }

  _channelControllers[channelName]?.close();
  _channelControllers.remove(channelName);
  _channelStreams.remove(channelName);

  _presenceControllers[channelName]?.close();
  _presenceControllers.remove(channelName);
  _presenceStreams.remove(channelName);
}