Commit | Line | Data |
109b110b |
1 | #!/usr/bin/env perl |
8eec3c69 |
2 | package MooseX::Singleton::Role::Meta::Instance; |
3 | use Moose::Role; |
109b110b |
4 | use Scalar::Util 'weaken'; |
5 | |
7afceec3 |
6 | sub get_singleton_instance { |
109b110b |
7 | my ($self, $instance) = @_; |
8 | |
9 | return $instance if blessed $instance; |
ef266b1f |
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 | |
e2119ce9 |
17 | # We need to go through ->new in order to make sure BUILD and |
18 | # BUILDARGS get called. |
19 | return $instance->meta->name->new; |
109b110b |
20 | } |
21 | |
8eec3c69 |
22 | override clone_instance => sub { |
7afceec3 |
23 | my ($self, $instance) = @_; |
24 | $self->get_singleton_instance($instance); |
8eec3c69 |
25 | }; |
7afceec3 |
26 | |
8eec3c69 |
27 | override get_slot_value => sub { |
109b110b |
28 | my ($self, $instance, $slot_name) = @_; |
7afceec3 |
29 | $self->is_slot_initialized($instance, $slot_name) ? $self->get_singleton_instance($instance)->{$slot_name} : undef; |
8eec3c69 |
30 | }; |
109b110b |
31 | |
8eec3c69 |
32 | override set_slot_value => sub { |
109b110b |
33 | my ($self, $instance, $slot_name, $value) = @_; |
7afceec3 |
34 | $self->get_singleton_instance($instance)->{$slot_name} = $value; |
8eec3c69 |
35 | }; |
109b110b |
36 | |
8eec3c69 |
37 | override deinitialize_slot => sub { |
109b110b |
38 | my ( $self, $instance, $slot_name ) = @_; |
7afceec3 |
39 | delete $self->get_singleton_instance($instance)->{$slot_name}; |
8eec3c69 |
40 | }; |
109b110b |
41 | |
8eec3c69 |
42 | override is_slot_initialized => sub { |
109b110b |
43 | my ($self, $instance, $slot_name, $value) = @_; |
7afceec3 |
44 | exists $self->get_singleton_instance($instance)->{$slot_name} ? 1 : 0; |
8eec3c69 |
45 | }; |
109b110b |
46 | |
8eec3c69 |
47 | override weaken_slot_value => sub { |
109b110b |
48 | my ($self, $instance, $slot_name) = @_; |
7afceec3 |
49 | weaken $self->get_singleton_instance($instance)->{$slot_name}; |
8eec3c69 |
50 | }; |
109b110b |
51 | |
8eec3c69 |
52 | override inline_slot_access => sub { |
109b110b |
53 | my ($self, $instance, $slot_name) = @_; |
7afceec3 |
54 | sprintf "%s->meta->instance_metaclass->get_singleton_instance(%s)->{%s}", $instance, $instance, $slot_name; |
8eec3c69 |
55 | }; |
109b110b |
56 | |
2b4ce4bd |
57 | no Moose; |
58 | |
109b110b |
59 | 1; |
60 | |
b375b147 |
61 | __END__ |
62 | |
63 | =pod |
64 | |
65 | =head1 NAME |
66 | |
8eec3c69 |
67 | MooseX::Singleton::Role::Meta::Instance - Instance metaclass role for MooseX::Singleton |
b375b147 |
68 | |
69 | =head1 DESCRIPTION |
70 | |
8eec3c69 |
71 | This role overrides all object access so that it gets the appropriate |
72 | singleton instance for the class. |
b375b147 |
73 | |
74 | =cut |
75 | |