yap-6.3/packages/ProbLog/problog/variables.yap

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%  $Date: 2011-11-28 14:41:26 +0100 (Mon, 28 Nov 2011) $
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%  ProbLog was developed at Katholieke Universiteit Leuven
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% Statistics for ProbLog
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:- module(variables, [problog_var_set/2,
                      problog_var_set_once/2,
                      problog_var_get/2,
                      problog_var_is_set/1,
                      problog_var_defined/4,
                      problog_var_defined/1,
                      problog_var_define/4,
                      problog_var_define/3,
                      problog_var_clear/1,
                      problog_var_clear_all/0,
                      problog_var_group/1,
                      problog_timer_start/1,
                      problog_timer_stop/2,
                      problog_timer_pause/1,
                      problog_timer_pause/2,
                      problog_timer_resume/1,
                      problog_time_out/4,
                      problog_var_timer_start/1,
                      problog_var_timer_resume/1,
                      problog_var_timer_pause/1,
                      problog_var_timer_stop/1,
                      problog_var_timer_timeout/1,
                      problog_var_time_out/4]).

:- yap_flag(unknown,error).
:- style_check(single_var).

problog_var_set(Variable, Value):-
  ground(Variable), nonvar(Value),
  (recorded(problog_variables, stored(Variable, _Value), Ref) ->
    erase(Ref)
  ;
    true
  ),
  recordz(problog_variables, stored(Variable, Value), _Ref).

problog_var_set_once(Variable, Value):-
  ground(Variable), nonvar(Value),
  (recorded(problog_variables, stored(Variable, _Value), __Ref) ->
    throw(problog_variable_already_set(problog_var_set_once(Variable, Value)))
  ;
    recordz(problog_variables, stored(Variable, Value), _Ref)
  ).

problog_var_get(Variable, Value):-
  ((ground(Variable),recorded(problog_variables, stored(Variable, Value), _Ref)) ->
    true
  ;
    throw(problog_variable_not_set(problog_var_get(Variable, Value)))
  ).

problog_var_is_set(Variable):-
  nonvar(Variable),
  recorded(problog_variables, stored(Variable, _Value), _Ref).

problog_var_defined(Variable):-
  problog_var_defined(Variable, _Group, _Type, _Messages).
problog_var_defined(Variable, Group, Type, Messages):-
  recorded(problog_variables, defined(Variable, Group, Type, Messages), _Ref).
problog_var_defined(Variable, default, untyped, messages(Variable, ':', '')):-
  recorded(problog_variables, stored(Variable, _Value), _Ref),
  \+ recorded(problog_variables, defined(Variable, _Group, _Type, _Messages), _).

problog_var_define(Variable, Group, Type):-
  problog_var_define(Variable, Group, Type, messages(Variable, ':', '')).
problog_var_define(Variable, Group, Type, Messages):-
  recorded(problog_variables, defined(Variable, _Group, _Type, _Messages), _Ref),
  throw(problog_variable_already_defined(problog_var_define(Variable, Group, Type, Messages))).
problog_var_define(Variable, Group, Type, Messages):-
  recordz(problog_variables, defined(Variable, Group, Type, Messages), _Ref),
  (recorded(problog_variables, group(Group), _) ->
    true
  ;
    recordz(problog_variables, group(Group), __Ref)
  ).

problog_var_clear(Variable):-
  recorded(problog_variables, stored(Variable, _), Ref),
  erase(Ref).
problog_var_clear_all:-
  recorded(problog_variables, stored(_, _), Ref),
  erase(Ref),
  fail.
problog_var_clear_all.

problog_var_group(Group):-
  recorded(problog_variables, group(Group), _).
problog_var_group(default).


%%% Migrated code from timers %%%
%
% This is more or less duplicate code now with timers.
% We should decide if it stays here or it is a seperate module.
%
% modfications from module timers: works with records, stop stops a paused timer
% should start resume a paused timer? Then no need for predicate resume...
%

problog_timer_start(Name) :-
  (recorded(problog_timer, timer(Name, _), _) ->
    throw(problog_timer_already_started(problog_timer_start(Name)));
    statistics(walltime, [StartTime, _]),
    recordz(problog_timer, timer(Name, StartTime), _)
  ).

problog_timer_stop(Name, Duration) :-
  recorded(problog_timer, timer(Name, StartTime), Ref),
  erase(Ref), !,
  statistics(walltime, [StopTime, _]),
  Duration is StopTime - StartTime.
problog_timer_stop(Name, Duration) :-
  (recorded(problog_timer, timer_paused(Name, Duration), Ref) ->
    erase(Ref)
  ;
    throw(problog_timer_not_started(problog_timer_stop(Name, Duration)))
  ).

problog_timer_pause(Name) :-
  (recorded(problog_timer, timer(Name, StartTime), Ref) ->
    erase(Ref),
    statistics(walltime, [StopTime, _]),
    Duration is StopTime - StartTime,
    recordz(problog_timer, timer_paused(Name, Duration), _)
  ;
    throw(problog_timer_not_started(problog_timer_pause(Name)))
  ).

problog_timer_pause(Name, Duration) :-
  (recorded(problog_timer, timer(Name, StartTime), Ref) ->
    erase(Ref),
    statistics(walltime, [StopTime, _]),
    Duration is StopTime - StartTime,
    recordz(problog_timer, timer_paused(Name, Duration), _)
  ;
    throw(problog_timer_not_started(problog_timer_pause(Name)))
  ).

problog_timer_resume(Name):-
  (recorded(problog_timer, timer_paused(Name, Duration), Ref) ->
    erase(Ref),
    statistics(walltime, [ResumeTime, _]),
    CorrectedStartTime is ResumeTime - Duration,
    recordz(problog_timer, timer(Name, CorrectedStartTime), _)
  ;
    throw(problog_timer_not_paused(problog_timer_resume(Name)))
  ).

%%% Syntactic sugar to make timer based variables %%%

problog_var_timer_start(Variable):-
  problog_timer_start(Variable).
problog_var_timer_resume(Variable):-
  problog_timer_resume(Variable).
problog_var_timer_pause(Variable):-
  problog_timer_pause(Variable, Duration),
  problog_var_set(Variable, Duration).
problog_var_timer_stop(Variable):-
  problog_timer_stop(Variable, Duration),
  problog_var_set(Variable, Duration).
problog_var_timer_timeout(Variable):-
  problog_timer_stop(Variable, _Duration),
  problog_var_set(Variable, timeout).

%%% This is possible for future use %%%

:- use_module(library(timeout)).
:- meta_predicate(problog_var_time_out(0, *, *, *)).
:- meta_predicate(problog_time_out(0, *, *, *)).
%
% Problems with nesting, use with care
% always succeeds returns Success = true/fail, Time = Msec taken/timeout
%
problog_var_time_out(M:Goal, TimeOut, Success, Variable):-
  problog_time_out(M:Goal, TimeOut, Success, Time),
  problog_var_set(Variable, Time).
problog_time_out(M:Goal, TimeOut, Success, Time):-
  MSecs is TimeOut * 1000,
  problog_timer_start(time_measure),
  (time_out(M:Goal, MSecs, Result) ->
    problog_timer_stop(time_measure, Duration),
    (Result == success ->
      Success = true,
      Time = Duration
    ;
      Success = fail,
      Time = Result
    )
  ;
    Success = fail,
    problog_timer_stop(time_measure, Time)
  ).