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