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1 | package MooseX::Singleton::Role::Meta::Instance; |
2 | use Moose::Role; |
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3 | use Scalar::Util 'weaken'; |
4 | |
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5 | |
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6 | sub get_singleton_instance { |
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7 | my ( $self, $instance ) = @_; |
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8 | |
9 | return $instance if blessed $instance; |
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10 | |
11 | # optimization: it's really slow to go through new_object for every access |
12 | # so return the singleton if we see it already exists, which it will every |
13 | # single except the first. |
14 | no strict 'refs'; |
15 | return ${"$instance\::singleton"} if defined ${"$instance\::singleton"}; |
16 | |
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17 | # We need to go through ->new in order to make sure BUILD and |
18 | # BUILDARGS get called. |
19 | return $instance->meta->name->new; |
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20 | } |
21 | |
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22 | override clone_instance => sub { |
23 | my ( $self, $instance ) = @_; |
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24 | $self->get_singleton_instance($instance); |
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25 | }; |
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26 | |
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27 | override get_slot_value => sub { |
28 | my ( $self, $instance, $slot_name ) = @_; |
29 | $self->is_slot_initialized( $instance, $slot_name ) |
30 | ? $self->get_singleton_instance($instance)->{$slot_name} |
31 | : undef; |
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32 | }; |
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33 | |
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34 | override set_slot_value => sub { |
35 | my ( $self, $instance, $slot_name, $value ) = @_; |
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36 | $self->get_singleton_instance($instance)->{$slot_name} = $value; |
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37 | }; |
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38 | |
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39 | override deinitialize_slot => sub { |
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40 | my ( $self, $instance, $slot_name ) = @_; |
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41 | delete $self->get_singleton_instance($instance)->{$slot_name}; |
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42 | }; |
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43 | |
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44 | override is_slot_initialized => sub { |
45 | my ( $self, $instance, $slot_name, $value ) = @_; |
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46 | exists $self->get_singleton_instance($instance)->{$slot_name} ? 1 : 0; |
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47 | }; |
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48 | |
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49 | override weaken_slot_value => sub { |
50 | my ( $self, $instance, $slot_name ) = @_; |
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51 | weaken $self->get_singleton_instance($instance)->{$slot_name}; |
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52 | }; |
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53 | |
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54 | override inline_slot_access => sub { |
55 | my ( $self, $instance, $slot_name ) = @_; |
56 | sprintf "%s->meta->instance_metaclass->get_singleton_instance(%s)->{%s}", |
57 | $instance, $instance, $slot_name; |
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58 | }; |
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59 | |
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60 | no Moose::Role; |
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61 | |
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62 | 1; |
63 | |
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64 | # ABSTRACT: Instance metaclass role for MooseX::Singleton |
65 | |
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66 | __END__ |
67 | |
68 | =pod |
69 | |
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70 | =head1 DESCRIPTION |
71 | |
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72 | This role overrides all object access so that it gets the appropriate |
73 | singleton instance for the class. |
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74 | |
75 | =cut |
76 | |