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yap-6.3/Logtalk/library/event_registry.lgt

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