6 use List::Util qw(reduce);
11 handles => [ qw(add_predicate add_rule) ],
17 has facts => (is => 'ro', default => sub { {} });
19 has observation_policy => (is => 'ro');
22 my ($self, @terms) = @_;
23 my $rule_set = $self->rule_set;
24 my $head = $rule_set->expand_and_link(undef, @terms, [ 'materialize' ]);
25 my $state = DX::State->new(
31 facts => $self->facts,
32 rule_set => $rule_set,
34 return DX::ResultStream->new(
36 ($self->observation_policy
37 ? (observation_policy => $self->observation_policy)
43 my ($self, $action) = @_;
44 my @invalidate = $action->run;
45 while (my ($type, $value) = splice @invalidate, 0, 2) {
46 $self->facts->{$type}->remove_value($value);