Modul Ref

 Jan Burse, erstellt 14. Aug 2019 
/**


 * The predicates assertable_ref/2 and assumable_ref/2 allow the


 * compilation of a clause without any thread contention. The clause


 * can be associated and de-associated with the head predicate via


 * the predicates recorda_ref/1, recordz_ref/1 and erase_ref/1 whereby


 * only one thread will win. A new instance of the original clause


 * can be retrieved again by the predicate compiled_ref/2.


 *


 * The predicate clause_ref/3 can be used to find a clause in the


 * knowledge base. This predicate respects the logical view approach


 * form the ISO core Prolog standard. The predicate will further filter


 * and only return those clauses that are visible from the head


 * predicate that is used in the search. The predicate additionally


 * returns clauses that can be used with the other predicates here.


 *


 * The predicates ref_property/2, set_ref_property/2 and reset_re_property/2


 * allow inspecting and modifying clause properties. Clause references


 * might not only refer to clauses, they implement a more general


 * base class. Clause references are for example used in the Jekejeke


 * Minlog extension to refer to attributed variable slots.


 *


 * Warranty & Liability


 * To the extent permitted by applicable law and unless explicitly


 * otherwise agreed upon, XLOG Technologies GmbH makes no warranties


 * regarding the provided information. XLOG Technologies GmbH assumes


 * no liability that any problems might be solved with the information


 * provided by XLOG Technologies GmbH.


 *


 * Rights & License


 * All industrial property rights regarding the information - copyright


 * and patent rights in particular - are the sole property of XLOG


 * Technologies GmbH. If the company was not the originator of some


 * excerpts, XLOG Technologies GmbH has at least obtained the right to


 * reproduce, change and translate the information.


 *


 * Reproduction is restricted to the whole unaltered document. Reproduction


 * of the information is only allowed for non-commercial uses. Selling,


 * giving away or letting of the execution of the library is prohibited.


 * The library can be distributed as part of your applications and libraries


 * for execution provided this comment remains unchanged.


 *


 * Restrictions


 * Only to be distributed with programs that add significant and primary


 * functionality to the library. Not to be distributed with additional


 * software intended to replace any components of the library.


 *


 * Trademarks


 * Jekejeke is a registered trademark of XLOG Technologies GmbH.


 */




:- package(library(jekpro/frequent/experiment)).


:- use_package(foreign(jekpro/frequent/experiment)).




:- module(ref, []).




/**


 * assertable_ref(C, R):


 * The predicate compiles the term C into a new clause reference R.


 * An undefined or unimplemented head predicate will be turned into a


 * dynamic predicate. Otherwise the head predicate must be dynamic,


 * thread local or group local.


 */


:- public assertable_ref/2.


:- meta_predicate assertable_ref(-1, ?).


:- special(assertable_ref/2, 'SpecialRef', 0).




/**


 * assumable_ref(C, R):


 * The predicate compiles the term C into a new clause reference R.


 * An undefined or unimplemented head predicate will be turned into a


 * thread local predicate. Otherwise the head must be dynamic,


 * thread local or group local.


 */


:- public assumable_ref/2.


:- meta_predicate assumable_ref(-1, ?).


:- special(assumable_ref/2, 'SpecialRef', 1).




/**


 * recorda_ref(R):


 * The predicate inserts the clause referenced by R at the top. The


 * predicate fails when the clause has already been recorded.


 */


:- public recorda_ref/1.


:- special(recorda_ref/1, 'SpecialRef', 2).




/**


 * recordz_ref(R):


 * The predicate inserts the clause referenced by R at the bottom. The


 * predicate fails when the clause has already been recorded.


 */


:- public recordz_ref/1.


:- special(recordz_ref/1, 'SpecialRef', 3).




/**


 * erase_ref(R):


 * The predicate removes the clause referenced by R. The predicate


 * fails when the clause has already been erased.


 */


:- public erase_ref/1.


:- special(erase_ref/1, 'SpecialRef', 4).




/**


 * compiled_ref(R, C):


 * The predicate returns a copy of the term C that was compiled


 * into the clause reference R.


 */


:- public compiled_ref/2.


:- meta_predicate compiled_ref(?, -1).


:- special(compiled_ref/2, 'SpecialRef', 5).




/**


 * clause_ref(H, B, R):


 * The predicate succeeds with the user clauses that match


 * H :- B and the clause reference R of the user clause. The


 * head predicate must be dynamic or thread local.


 */


% clause_ref(-Callable, -Goal, -Ref)


:- public clause_ref/3.


:- meta_predicate clause_ref(-1, 0, ?).


:- special(clause_ref/3, 'SpecialRef', 6).




/**


 * clause_ref(C, R):


 * The predicate succeeds with the user clauses that match


 * C and the clause reference R of the user clause. The


 * head predicate must be dynamic or thread local.


 */


% clause_ref(-Term, -Ref)


:- public clause_ref/2.


:- meta_predicate clause_ref(-1, ?).


clause_ref(C, _) :- var(C),


   throw(error(instantiation_error, _)).


clause_ref((H :- B), R) :- !,


   clause_ref(H, B, R).


clause_ref(H, R) :-


   clause_ref(H, true, R).




/**


 * ref_property(R, P):


 * The predicate succeeds for the properties P of the reference R.


 */


% ref_property(+Reference, -Property)


:- public ref_property/2.


ref_property(I, R) :- var(R), !,


   sys_ref_property(I, P),


   sys_member(R, P).


ref_property(I, R) :-


   functor(R, F, A),


   sys_ref_property_chk(I, F/A, P),


   sys_member(R, P).




:- private sys_ref_property/2.


:- special(sys_ref_property/2, 'SpecialRef', 7).




:- private sys_ref_property_chk/3.


:- special(sys_ref_property_chk/3, 'SpecialRef', 8).




/**


 * set_ref_property(R, P):


 * The predicate assigns the property P to the reference R.


 */


% set_ref_property(+Reference, +Property)


:- public set_ref_property/2.


:- special(set_ref_property/2, 'SpecialRef', 9).




/**


 * reset_ref_property(R, P):


 * The predicate de-assigns the property P from the reference R.


 */


% reset_ref_property(+Reference, +Property)


:- public reset_ref_property/2.


:- special(reset_ref_property/2, 'SpecialRef', 10).




/**


 * compilable_ref(C, R):


 * The predicate compiles the term C into a new clause reference R.


 * An undefined or unimplemented head predicate will be turned into a


 * static predicate. Otherwise the head must be static, dynamic,


 * thread local or group local.


 */


:- public compilable_ref/2.


:- meta_predicate compilable_ref(-1, ?).


:- special(compilable_ref/2, 'SpecialRef', 11).

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