:- object(before_event_registry,
implements(event_registryp)).
:- info([
version is 1.0,
author is 'Paulo Moura',
date is 2000/7/24,
comment is 'Before events registry predicates.']).
monitors(Monitors) :-
findall(Monitor, current_event(before, _, _, _, Monitor), List),
{sort(List, Monitors)}.
monitored(Objects) :-
findall(Object, current_event(before, Object, _, _, _), List),
{sort(List, Objects)}.
monitor(Object, Message, Sender, Monitor) :-
current_event(before, Object, Message, Sender, Monitor).
set_monitor(Object, Message, Sender, Monitor) :-
define_events(before, Object, Message, Sender, Monitor).
del_monitors(Object, Message, Sender, Monitor) :-
abolish_events(before, Object, Message, Sender, Monitor).
del_monitors :-
abolish_events(before, _, _, _, _).
:- end_object.
