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1 | package DX::Hypothesis; |
2 | |
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3 | use DX::ActionPolicy::LockScope; |
4 | use Types::Standard qw(ArrayRef); |
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5 | use DX::Utils qw(deparse); |
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6 | use DX::Class; |
7 | |
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8 | has scope => (is => 'ro', isa => Scope, required => 1); |
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9 | |
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10 | has resolved_propositions => ( |
11 | is => 'ro', isa => ResolvedPropositionSet, required => 1 |
12 | ); |
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13 | |
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14 | has actions => ( |
15 | is => 'ro', isa => ArrayRef[Action], required => 1 |
16 | ); |
17 | |
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18 | has action_applications => ( |
19 | is => 'ro', isa => ArrayRef[Action], required => 1 |
20 | ); |
21 | |
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22 | has action_policy => (is => 'ro', isa => ActionPolicy, required => 1); |
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23 | |
24 | sub with_actions { |
25 | my ($self, @actions) = @_; |
26 | my $hyp = $self; |
27 | foreach my $act (@actions) { |
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28 | return undef unless $self->action_policy->allows($act); |
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29 | ($hyp, my @events) = $act->dry_run($hyp); |
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30 | return undef unless $hyp; |
31 | $hyp = $hyp->but_recheck_for(@events); |
32 | return undef unless $hyp; |
33 | } |
34 | return $hyp; |
35 | } |
36 | |
37 | sub but_recheck_for { |
38 | my ($self, @events) = @_; |
39 | my ($still_resolved, @recheck) = $self->resolved_propositions |
40 | ->but_expire_for(@events); |
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41 | return $self unless @recheck; |
42 | |
43 | my $ap = DX::ActionPolicy::LockScope->new( |
44 | lock_to_depth => $self->scope->depth, |
45 | next_policy => $self->action_policy, |
46 | ); |
47 | |
48 | # we should probably be doing something about pruning the scope |
49 | # but that's completely pointless until we have rules |
50 | |
51 | my $hyp = ref($self)->new( |
52 | scope => $self->scope, |
53 | resolved_propositions => DX::ResolvedPropositionSet->new_empty, |
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54 | actions => [], |
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55 | action_applications => [], |
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56 | action_policy => $ap, |
57 | ); |
58 | |
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59 | my $pseq = DX::PropositionSequence->new( |
60 | members => \@recheck, |
61 | external_names => {}, |
62 | internal_names => {}, |
63 | ); |
64 | |
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65 | trace 'step.recheck.hyp' => $hyp; |
66 | |
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67 | my $ss = DX::SearchState->new_for($hyp, $pseq); |
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68 | |
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69 | my $sol_ss = $ss->find_solution; |
70 | |
71 | unless ($sol_ss) { |
72 | trace 'step.recheck.fail' => 'argh'; |
73 | return undef; |
74 | } |
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75 | |
76 | my $sol_rps = $sol_ss->current_hypothesis->resolved_propositions; |
77 | |
78 | my $rps = $still_resolved; |
79 | |
80 | $rps = $rps->with_updated_dependencies_for( |
81 | $_, $sol_rps->dependencies_for($_) |
82 | ) for @recheck; |
83 | |
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84 | trace 'step.recheck.done' => 'yay'; |
85 | |
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86 | return $self->but(resolved_propositions => $rps); |
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87 | } |
88 | |
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89 | sub with_resolution { |
90 | my ($self, $prop, $depends) = @_; |
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91 | $self->but( |
92 | resolved_propositions => $self->resolved_propositions |
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93 | ->with_resolution_for( |
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94 | $prop, |
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95 | $depends, |
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96 | ), |
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97 | ); |
98 | } |
99 | |
100 | 1; |