Commit | Line | Data |
158c88c0 |
1 | package Catalyst::Component; |
2 | |
a7caa492 |
3 | use Moose; |
6a7254b5 |
4 | use Class::MOP; |
74c89dea |
5 | use Class::MOP::Object; |
e8b9f2a9 |
6 | use Catalyst::Utils; |
cb89a296 |
7 | use Class::C3::Adopt::NEXT; |
6a7254b5 |
8 | use MRO::Compat; |
9 | use mro 'c3'; |
5595dd2f |
10 | |
a7caa492 |
11 | with 'MooseX::Emulate::Class::Accessor::Fast'; |
12 | with 'Catalyst::ClassData'; |
13 | |
14 | |
158c88c0 |
15 | =head1 NAME |
16 | |
17 | Catalyst::Component - Catalyst Component Base Class |
18 | |
19 | =head1 SYNOPSIS |
20 | |
21 | # lib/MyApp/Model/Something.pm |
22 | package MyApp::Model::Something; |
23 | |
e7f1cf73 |
24 | use base 'Catalyst::Component'; |
158c88c0 |
25 | |
26 | __PACKAGE__->config( foo => 'bar' ); |
27 | |
28 | sub test { |
29 | my $self = shift; |
30 | return $self->{foo}; |
31 | } |
32 | |
33 | sub forward_to_me { |
34 | my ( $self, $c ) = @_; |
35 | $c->response->output( $self->{foo} ); |
36 | } |
ac5c933b |
37 | |
158c88c0 |
38 | 1; |
39 | |
40 | # Methods can be a request step |
41 | $c->forward(qw/MyApp::Model::Something forward_to_me/); |
42 | |
43 | # Or just methods |
44 | print $c->comp('MyApp::Model::Something')->test; |
45 | |
46 | print $c->comp('MyApp::Model::Something')->{foo}; |
47 | |
48 | =head1 DESCRIPTION |
49 | |
ac5c933b |
50 | This is the universal base class for Catalyst components |
158c88c0 |
51 | (Model/View/Controller). |
52 | |
53 | It provides you with a generic new() for instantiation through Catalyst's |
54 | component loader with config() support and a process() method placeholder. |
55 | |
7cd1a42b |
56 | =cut |
158c88c0 |
57 | |
46d0346d |
58 | __PACKAGE__->mk_classdata('_plugins'); |
11b256bc |
59 | __PACKAGE__->mk_classdata('_config'); |
e8b9f2a9 |
60 | |
2ef59958 |
61 | sub BUILDARGS { |
62 | my ($self) = @_; |
63 | |
158c88c0 |
64 | # Temporary fix, some components does not pass context to constructor |
65 | my $arguments = ( ref( $_[-1] ) eq 'HASH' ) ? $_[-1] : {}; |
e8b9f2a9 |
66 | |
a7caa492 |
67 | my $args = $self->merge_config_hashes( $self->config, $arguments ); |
2ef59958 |
68 | |
69 | return $args; |
70 | } |
4090e3bb |
71 | |
22247e54 |
72 | sub COMPONENT { |
73 | my ( $self, $c ) = @_; |
74 | |
75 | # Temporary fix, some components does not pass context to constructor |
76 | my $arguments = ( ref( $_[-1] ) eq 'HASH' ) ? $_[-1] : {}; |
6a7254b5 |
77 | if( my $next = $self->next::can ){ |
78 | my $class = blessed $self || $self; |
79 | my ($next_package) = Class::MOP::get_code_info($next); |
7e2ec16e |
80 | warn "There is a COMPONENT method resolving after Catalyst::Component in ${next_package}.\n"; |
81 | warn "This behavior can no longer be supported, and so your application is probably broken.\n"; |
82 | warn "Your linearised isa hierarchy is: " . join(', ', mro::get_linear_isa($class)) . "\n"; |
83 | warn "Please see perldoc Catalyst::Upgrading for more information about this issue.\n"; |
6a7254b5 |
84 | } |
4090e3bb |
85 | return $self->new($c, $arguments); |
22247e54 |
86 | } |
87 | |
158c88c0 |
88 | sub config { |
11b256bc |
89 | my $self = shift; |
90 | my $config = $self->_config || {}; |
91 | if (@_) { |
92 | my $newconfig = { %{@_ > 1 ? {@_} : $_[0]} }; |
93 | $self->_config( |
94 | $self->merge_config_hashes( $config, $newconfig ) |
95 | ); |
96 | } else { |
97 | # this is a bit of a kludge, required to make |
98 | # __PACKAGE__->config->{foo} = 'bar'; |
edffeb5a |
99 | # work in a subclass. |
e106a59f |
100 | my $class = blessed($self) || $self; |
101 | my $meta = Class::MOP::get_metaclass_by_name($class); |
74c89dea |
102 | unless ($meta->has_package_symbol('$_config')) { |
11b256bc |
103 | |
104 | $config = $self->merge_config_hashes( $config, {} ); |
105 | $self->_config( $config ); |
46d0346d |
106 | } |
158c88c0 |
107 | } |
11b256bc |
108 | return $config; |
158c88c0 |
109 | } |
110 | |
7cd1a42b |
111 | sub merge_config_hashes { |
112 | my ( $self, $lefthash, $righthash ) = @_; |
158c88c0 |
113 | |
7cd1a42b |
114 | return Catalyst::Utils::merge_hashes( $lefthash, $righthash ); |
115 | } |
158c88c0 |
116 | |
117 | sub process { |
118 | |
119 | Catalyst::Exception->throw( message => ( ref $_[0] || $_[0] ) |
120 | . " did not override Catalyst::Component::process" ); |
121 | } |
122 | |
213cf5bb |
123 | no Moose; |
46d0346d |
124 | |
125 | __PACKAGE__->meta->make_immutable; |
7cd1a42b |
126 | 1; |
baf6a3db |
127 | |
7cd1a42b |
128 | __END__ |
baf6a3db |
129 | |
7cd1a42b |
130 | =head1 METHODS |
baf6a3db |
131 | |
7cd1a42b |
132 | =head2 new($c, $arguments) |
baf6a3db |
133 | |
7cd1a42b |
134 | Called by COMPONENT to instantiate the component; should return an object |
135 | to be stored in the application's component hash. |
136 | |
137 | =head2 COMPONENT($c, $arguments) |
138 | |
139 | If this method is present (as it is on all Catalyst::Component subclasses, |
140 | it is called by Catalyst during setup_components with the application class |
141 | as $c and any config entry on the application for this component (for example, |
142 | in the case of MyApp::Controller::Foo this would be |
ac5c933b |
143 | MyApp->config->{'Controller::Foo'}). The arguments are expected to be a |
144 | hashref and are merged with the __PACKAGE__->config hashref before calling |
7cd1a42b |
145 | ->new to instantiate the component. |
146 | |
147 | =head2 $c->config |
148 | |
149 | =head2 $c->config($hashref) |
150 | |
151 | =head2 $c->config($key, $value, ...) |
152 | |
ac5c933b |
153 | Accessor for this component's config hash. Config values can be set as |
7cd1a42b |
154 | key value pair, or you can specify a hashref. In either case the keys |
ac5c933b |
155 | will be merged with any existing config settings. Each component in |
7cd1a42b |
156 | a Catalyst application has it's own config hash. |
157 | |
158 | =head2 $c->process() |
159 | |
160 | This is the default method called on a Catalyst component in the dispatcher. |
ac5c933b |
161 | For instance, Views implement this action to render the response body |
7cd1a42b |
162 | when you forward to them. The default is an abstract method. |
163 | |
164 | =head2 $c->merge_config_hashes( $hashref, $hashref ) |
165 | |
166 | Merges two hashes together recursively, giving right-hand precedence. |
167 | Alias for the method in L<Catalyst::Utils>. |
baf6a3db |
168 | |
825dbf85 |
169 | =head1 OPTIONAL METHODS |
170 | |
171 | =head2 ACCEPT_CONTEXT($c, @args) |
172 | |
f9c35d6c |
173 | Catalyst components are normally initialized during server startup, either |
825dbf85 |
174 | as a Class or a Instance. However, some components require information about |
175 | the current request. To do so, they can implement an ACCEPT_CONTEXT method. |
176 | |
177 | If this method is present, it is called during $c->comp/controller/model/view |
178 | with the current $c and any additional args (e.g. $c->model('Foo', qw/bar baz/) |
179 | would cause your MyApp::Model::Foo instance's ACCEPT_CONTEXT to be called with |
180 | ($c, 'bar', 'baz')) and the return value of this method is returned to the |
181 | calling code in the application rather than the component itself. |
182 | |
158c88c0 |
183 | =head1 SEE ALSO |
184 | |
e7f1cf73 |
185 | L<Catalyst>, L<Catalyst::Model>, L<Catalyst::View>, L<Catalyst::Controller>. |
158c88c0 |
186 | |
2f381252 |
187 | =head1 AUTHORS |
158c88c0 |
188 | |
2f381252 |
189 | Catalyst Contributors, see Catalyst.pm |
158c88c0 |
190 | |
191 | =head1 COPYRIGHT |
192 | |
193 | This program is free software, you can redistribute it and/or modify it under |
194 | the same terms as Perl itself. |
195 | |
85d9fce6 |
196 | =cut |