[Opensource] How can i create Listener Objects for DBObject?

[Gaspar Gonzalez Oliva]

Hi,

I see that Expresso 5.0.4 have a DBObject method called <addCacheEventListener>,  but is
marked deprecated, that let us register another object to "listening"
(updates/adds/deletes) to this DBObject.  This method is deprecated, my question is:

1-What another option i have to do this, "listening"?. is the <notifyListeners>
method, the solution?.
2-Since what version of Expresso it is deprecated?

Gaspar