watch<T extends Object> method
Subscribing to a shared listener data object.
mark
--
Is the unique identifier of the shared data object before the query.
Implementation
Stream<T>? watch<T extends Object>({
String? mark,
}) {
final String key = keyGet<T>(mark);
final Iterable keys = _recordListenPool.keys;
if (keys.contains(key)) {
final StreamController<T>? gstreamController = instanceListenGet<T>(_recordListenPool, key);
return gstreamController?.stream;
}
return null;
}