90 lines
2.5 KiB
Prolog
90 lines
2.5 KiB
Prolog
/* $Id: clp_events.pl,v 1.1 2005-10-28 17:53:27 vsc Exp $
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Part of SWI-Prolog
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Author: Tom Schrijvers
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E-mail: tom.schrijvers@cs.kuleuven.ac.be
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WWW: http://www.swi-prolog.org
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Copyright (C): 2005, K.U.Leuven
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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As a special exception, if you link this library with other files,
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compiled with a Free Software compiler, to produce an executable, this
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library does not by itself cause the resulting executable to be covered
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by the GNU General Public License. This exception does not however
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invalidate any other reasons why the executable file might be covered by
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the GNU General Public License.
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*/
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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%
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% Module for managing constraint solver events.
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%
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% Author: Tom Schrijvers
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% E-mail: tom.schrijvers@cs.kuleuven.ac.be
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% Copyright: 2005, K.U.Leuven
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%
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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:-module(clp_events,
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[
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notify/2,
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subscribe/4,
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unsubscribe/2
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]).
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notify(V,NMod) :-
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( get_attr(V,clp_events,List) ->
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notify_list(List,NMod)
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;
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true
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).
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subscribe(V,NMod,SMod,Goal) :-
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( get_attr(V,clp_events,List) ->
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put_attr(V,clp_events,[entry(NMod,SMod,Goal)|List])
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;
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put_attr(V,clp_events,[entry(NMod,SMod,Goal)])
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).
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unsubscribe(V,SMod) :-
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( get_attr(V,clp_events,List) ->
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unsubscribe_list(List,SMod,NList),
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put_attr(V,clp_events,NList)
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;
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true
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).
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notify_list([],_).
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notify_list([entry(Mod,_,Goal)|Rest],NMod) :-
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( Mod == NMod ->
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call(Goal)
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;
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true
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),
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notify_list(Rest,NMod).
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unsubscribe_list([],_,_).
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unsubscribe_list([Entry|Rest],SMod,List) :-
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Entry = entry(_,Mod,_),
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( Mod == SMod ->
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List = Rest
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;
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List = [Entry|Tail],
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unsubscribe_list(Rest,SMod,Tail)
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).
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attr_unify_hook(_,_).
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