notify
Optional override for inheritors to do things before invoking actual OnEvent callback (if at all) within the confines of the OnEvent.Executor context.
See also
Invokes OnEvent with the provided data
Parameters
default
the default OnEvent.Executor to fall back to if no executor was not defined for this observer.
Invokes OnEvent with the provided data
Parameters
handler
Optional ability to pass UncaughtException.Handler wrapped as a CoroutineExceptionHandler to use with coroutine dispatchers. (See UncaughtException.Handler.uncaughtExceptionHandlerOrNull)
default
the default OnEvent.Executor to fall back to if no executor was not defined for this observer.