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1 /* Part of DML (Digital Music Laboratory)
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2 Copyright 2014-2015 Samer Abdallah, University of London
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3
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4 This program is free software; you can redistribute it and/or
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5 modify it under the terms of the GNU General Public License
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6 as published by the Free Software Foundation; either version 2
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7 of the License, or (at your option) any later version.
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8
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9 This program is distributed in the hope that it will be useful,
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10 but WITHOUT ANY WARRANTY; without even the implied warranty of
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11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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12 GNU General Public License for more details.
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13
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14 You should have received a copy of the GNU General Public
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15 License along with this library; if not, write to the Free Software
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16 Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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17 */
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18
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19 :- module(dml_misc, [ periodically/2, current_periodical/3, remove_periodical/1 ]).
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20 /** <module> Miscellaneous hooks and initialisations
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21
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22 This module implements some hooks for managing the context graphs
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23 which appear at the bottom of individual resource pages.
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24
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25 It also loads some miscellanous RDF graphs.
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26
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27 */
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28 :- use_module(library(semweb/rdf_db)).
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29 :- use_module(library(semweb/rdfs)).
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30 :- use_module(library(memo)).
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31 :- use_module(cliopatria(hooks)).
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32
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33 :- rdf_meta context_graph_class(r).
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34
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35 :- meta_predicate periodically(+,0).
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36 :- meta_predicate current_periodical(-,0,-).
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37
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38 cliopatria:context_graph(URI, Triples, _) :-
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39 context_graphable(URI), !,
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40 maplist(rdf_global_id,[rdf:type, prov:wasDerivedFrom],Excludes),
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41 findall(T, context_triple(Excludes,URI,[],T), T1),
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42 sort(T1,Triples).
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43
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44 context_triple(Excludes,URI,Visited,T) :-
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45 edge(URI,Pred,URI1,Triple),
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46 \+member(Pred,Excludes),
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47 ( T=Triple
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48 ; \+member(URI1,Visited),
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49 %context_graphable(URI1), % this follows a lot of link
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50 rdfs_individual_of(URI1,event:'Event'),
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51 context_triple(Excludes,URI1,[URI|Visited],T)
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52 ).
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53
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54 edge(URI,Pred,URI1,rdf(URI,Pred,URI1)) :- rdf(URI,Pred,URI1), URI1\=literal(_).
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55 edge(URI,Pred,URI1,rdf(URI1,Pred,URI)) :- rdf(URI1,Pred,URI).
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56
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57 context_graphable(URI) :-
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58 context_graph_class(Class),
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59 rdfs_individual_of(URI,Class).
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60
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61 context_graph_class(event:'Event').
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62 context_graph_class(mo:'Signal').
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63 context_graph_class(mo:'MusicalWork').
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64 context_graph_class(mo:'MusicGroup').
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65
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66 current_periodical(Interval,Goal,Id) :- current_alarm(_,periodically(Interval,Goal),Id,_).
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67 remove_periodical(Id) :- remove_alarm(Id).
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68
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69 periodically(Interval,Goal) :-
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70 memo:reify(Goal,Status),
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71 (Status=ok -> true; debug(cron,'Periodic goal ~q failed with ~q',[Goal,Status])),
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72 alarm(Interval,periodically(Interval,Goal),_,[remove(true)]).
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73
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