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