The node reference associated with the process.
The node reference associated with the process. A Some
value indicates that
at least one instance view is playing, whereas a None
value indicates that
there is no actively playing instance view at the moment.
The view must store a handle to its underlying model.
Registers a live observer with this observable.
Registers a live observer with this observable. The method is called with the
observing function which receives the observable's update message of type A
, and the
method generates an opaque Disposable
instance, which may be used to
remove the observer eventually (through the dispose
method).