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1 | package CatalystX::DynamicComponent; |
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2 | use MooseX::Role::Parameterized; |
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3 | use MooseX::Types::Moose qw/Str CodeRef HashRef ArrayRef/; |
4 | use Catalyst::Utils; |
5 | use Moose::Util::TypeConstraints; |
6 | use List::MoreUtils qw/uniq/; |
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7 | use namespace::autoclean; |
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8 | |
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9 | enum __PACKAGE__ . '::ResolveStrategy' => qw/ |
10 | merge |
11 | replace |
12 | /; |
13 | |
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14 | our $VERSION = 0.000001; |
15 | |
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16 | parameter 'name' => ( |
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17 | isa => Str, |
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18 | required => 1, |
19 | ); |
20 | |
21 | parameter 'pre_immutable_hook' => ( |
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22 | isa => CodeRef|Str, |
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23 | predicate => 'has_pre_immutable_hook', |
24 | ); |
25 | |
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26 | my %parameters = ( |
27 | methods => { |
28 | isa =>HashRef, |
29 | default => sub { {} }, |
30 | resolve_strategy => 'merge', |
31 | }, |
32 | roles => { |
33 | isa => ArrayRef, |
34 | default => sub { [] }, |
35 | resolve_strategy => 'merge', |
36 | }, |
37 | superclasses => { |
38 | isa => ArrayRef, |
39 | default => sub { [] }, |
40 | resolve_strategy => 'replace', |
41 | }, |
42 | ); |
43 | |
44 | # Shameless metaprogramming. |
45 | foreach my $name (keys %parameters) { |
46 | my $resolve_strategy = delete $parameters{$name}->{resolve_strategy}; |
47 | |
48 | parameter $name, %{ $parameters{$name} }; |
49 | |
50 | parameter $name . '_resolve_strategy' => ( |
51 | isa => __PACKAGE__ . '::ResolveStrategy', |
52 | default => $resolve_strategy, |
53 | ); |
54 | } |
55 | |
56 | # Code refs to implement the strategy types |
57 | my %strategies = ( # Right hand precedence where appropriate |
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58 | replace => sub { $_[1] ? $_[1] : $_[0]; }, |
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59 | merge => sub { |
60 | if (ref($_[0]) eq 'ARRAY') { |
61 | [ uniq( @{ $_[0] }, @{ $_[1] } ) ]; |
62 | } |
63 | else { |
64 | Catalyst::Utils::merge_hashes(shift, shift); |
65 | } |
66 | }, |
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67 | ); |
68 | |
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69 | # Wrap all the crazy up in a method to generically merge configs. |
70 | my $get_resolved_config = sub { |
71 | my ($name, $p, $config) = @_; |
72 | my $get_strategy_method_name = $name . '_resolve_strategy'; |
73 | my $strategy = $strategies{$p->$get_strategy_method_name()}; |
74 | $strategy->($p->$name, $config->{$name}) |
75 | || $parameters{$name}->{default}->(); |
76 | }; |
77 | |
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78 | role { |
79 | my $p = shift; |
80 | my $name = $p->name; |
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81 | my $pre_immutable_hook = $p->pre_immutable_hook; |
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82 | |
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83 | method $name => sub { |
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84 | my ($app, $name, $config) = @_; |
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85 | my $appclass = blessed($app) || $app; |
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86 | |
87 | $config ||= {}; |
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88 | |
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89 | my $type = $name; |
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90 | $type =~ s/::.*$//; |
91 | |
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92 | my $component_name = $appclass . '::' . $name; |
93 | my $meta = Moose->init_meta( for_class => $component_name ); |
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94 | |
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95 | my @superclasses = @{ $get_resolved_config->('superclasses', $p, $config) }; |
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96 | push(@superclasses, 'Catalyst::' . $type) unless @superclasses; |
97 | $meta->superclasses(@superclasses); |
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98 | |
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99 | my $methods = $get_resolved_config->('methods', $p, $config); |
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100 | foreach my $method_name (keys %$methods) { |
101 | $meta->add_method($method_name => $methods->{$method_name}); |
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102 | } |
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103 | |
104 | if (my @roles = @{ $get_resolved_config->('roles', $p, $config) }) { |
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105 | Moose::Util::apply_all_roles( $component_name, @roles); |
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106 | } |
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107 | |
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108 | if ($p->has_pre_immutable_hook) { |
109 | if (!ref($pre_immutable_hook)) { |
110 | $app->$pre_immutable_hook($meta, $config); |
111 | } |
112 | else { |
113 | $pre_immutable_hook->($meta, $config); |
114 | } |
115 | } |
116 | |
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117 | # stash the config of this generated class away |
118 | $meta->add_method('dynamic_model_config', sub { return $app->config->{$name} }); |
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119 | |
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120 | $meta->make_immutable; |
121 | |
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122 | my $instance = $app->setup_component($component_name); |
123 | $app->components->{ $component_name } = $instance; |
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124 | }; |
125 | }; |
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126 | |
127 | 1; |
128 | |
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129 | __END__ |
130 | |
131 | =head1 NAME |
132 | |
133 | CatalystX::DynamicComponent - Parameterised Moose role providing functionality to build Catalyst components at runtime. |
134 | |
135 | =head1 SYNOPSIS |
136 | |
137 | package My::DynamicComponentType; |
138 | use Moose::Role; |
139 | use namespace::autoclean; |
140 | |
141 | with 'CatalystX::DynamicComponent' => { |
142 | name => '_setup_one_of_my_components', # Name of injected method |
143 | }; |
144 | |
145 | after setup_components => sub { shift->_setup_all_my_components(@_); }; |
146 | |
147 | sub _setup_all_my_components { |
148 | my ($self, $c) = @_; |
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149 | my $app = ref($self) || $self; |
150 | foreach my $component_name ('Controller::Foo') { |
151 | my %component_config = %{ $c->config->{$component_name} }; |
152 | # Shallow copy so we avoid stuffing methods back in the config, as that's lame! |
153 | $component_config{methods} = { |
154 | some_method => sub { 'foo' }, |
155 | }; |
156 | |
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157 | # Calling this method creates a component, and registers it in your application |
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158 | # This component will subclass 'MyApp::ControllerBase', do 'MyApp::ControllerRole' |
159 | # and have a method called 'some_method' which will return the value 'foo'.. |
160 | $self->_setup_one_of_my_components($app . '::' . $component_name, \%component_config); |
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161 | } |
162 | } |
163 | |
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164 | package MyApp; |
165 | use Moose; |
166 | use namespace::autoclean; |
167 | use Catalyst qw/ |
168 | +My::DynameComponentType |
169 | /; |
170 | __PACKAGE__->config( |
171 | name => 'MyApp', |
172 | 'Controller::Foo' => { |
173 | superclasses => [qw/MyApp::ControllerBase/], |
174 | roles => [qw/MyApp::ControllerRole/], |
175 | }, |
176 | ); |
177 | __PACKAGE__->setup; |
178 | |
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179 | =head1 DESCRIPTION |
180 | |
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181 | CatalystX::DynamicComponent aims to provide a flexible and reuseable method of building L<Roles|Moose::Role> |
182 | which can be added to L<Catalyst> applications, which generate components dynamically at application |
183 | startup using the L<Moose> meta model. |
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184 | |
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185 | Thi is implemented as a parametrised role which curries a |
186 | component builder method into your current package at application time. |
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187 | |
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188 | Authors of specific dynamic component builders are expected implement an application class |
189 | roles which composes this role, and their own advice after the C<< setup_compontents >> |
190 | method, which will call the component generation method provided by using this role once |
191 | for each component you wish to create. |
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192 | |
193 | =head1 PARAMETERS |
194 | |
195 | =head2 name |
196 | |
197 | B<Required> - The name of the component generator method to curry. |
198 | |
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199 | =head2 methods |
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200 | |
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201 | Optional, a hash reference with keys being method names, and values being a L<Class::MOP::Method>, |
202 | or a plain code ref of a method to apply to |
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203 | the dynamically generated package before making it immutable. |
204 | |
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205 | =head2 roles |
206 | |
207 | Optional, an array reference of roles to apply to the generated component |
208 | |
209 | =head2 superclasses |
210 | |
211 | Optional, an array reference of superclasses to give the generated component. |
212 | |
213 | If this is not defined, and not passed in as an argument to the generation method, |
214 | then Catalyst::(Model|View|Controller) will used as the base class (as appropriate given |
215 | the requested namespace of the generated class, otherwise Catalyst::Component will be used. |
216 | |
217 | FIXME - Need tests for this. |
218 | |
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219 | =head2 pre_immutable_hook |
220 | |
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221 | Optional, either a coderef, which will be called with the component $meta and the merged $config, |
222 | or a string name of a method to call on the application class, with the same parameters. |
223 | |
224 | This hook is called after a component has been generated and methods added, but before it is made |
225 | immutable, constructed, and added to your component registry. |
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226 | |
227 | =head1 CURRIED COMPONENT GENERATOR |
228 | |
229 | =head2 ARGUMENTS |
230 | |
231 | =over |
232 | |
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233 | =item * |
234 | |
235 | $component_name (E.g. C<< MyApp::Controller::Foo >>) |
236 | |
237 | =item * |
238 | |
239 | $config (E.g. C<< $c->config->{$component_name} >>) |
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240 | |
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241 | =back |
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242 | |
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243 | =head3 config |
244 | |
245 | It is possible to set each of the roles, methods and superclasses parameters for each generated package |
246 | individually by defining those keys in the C< $config > parameter to your curried component generation method. |
247 | |
248 | By default, roles and methods supplied from the curried role, and those passed as config will be merged. |
249 | |
250 | Superclasses, no the other hand, will replace those from the curried configuration if passed as options. |
251 | This is to discourage accidental use of multiple inheritence, if you need this feature enabled, you should |
252 | probably be using Roles instead! |
253 | |
254 | It is possible to change the default behavior of each parameter by passing a |
255 | C< $param_name.'_resolve_strategy' > parameter when currying a class generator, with values of either |
256 | C<merge> or C<replace>. |
257 | |
258 | Example: |
259 | |
260 | package My::ComponentGenerator; |
261 | use Moose; |
262 | |
263 | with 'CatalystX::DynamicComponent' => { |
264 | name => 'generate_magic_component', |
265 | roles => ['My::Role'], |
266 | roles_resolve_strategy => 'replace', |
267 | }; |
268 | |
269 | package MyApp; |
270 | use Moose; |
271 | use Catalyst qw/ |
272 | My::ComponentGenerator |
273 | /; |
274 | extends 'Catalyst'; |
275 | after 'setup_components' => sub { |
276 | my ($app) = @_; |
277 | # Component generated has no roles |
278 | $app->generate_magic_component('MyApp::Controller::Foo', { roles => [] }); |
279 | # Component generated does My::Role |
280 | $app->generate_magic_component('MyApp::Controller::Foo', {} ); |
281 | }; |
282 | __PACKAGE__->setup; |
283 | |
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284 | =head2 OPERATION |
285 | |
286 | FIXME |
287 | |
288 | =head1 TODO |
289 | |
290 | =over |
291 | |
292 | =item * |
293 | |
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294 | Test pre_immutable hook in tests |
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295 | |
296 | =item * |
297 | |
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298 | More tests fixme? |
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299 | |
300 | =item * |
301 | |
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302 | Unlame needing to pass fully qualified component name in, that's retarded... |
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303 | |
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304 | Remember to fix the docs and clients too ;) |
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305 | |
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306 | =item * |
307 | |
308 | Tests for roles giving advice to methods which have just been added.. |
309 | |
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310 | =back |
311 | |
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312 | =head1 LINKS |
313 | |
314 | L<Catalyst>, L<MooseX::MethodAttributes>, L<CatalystX::ModelsFromConfig>. |
315 | |
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316 | =head1 BUGS |
317 | |
318 | Probably plenty, test suite certainly isn't comprehensive.. Patches welcome. |
319 | |
320 | =head1 AUTHOR |
321 | |
322 | Tomas Doran (t0m) <bobtfish@bobtfish.net> |
323 | |
324 | =head1 LICENSE |
325 | |
326 | This code is copyright (c) 2009 Tomas Doran. This code is licensed on the same terms as perl |
327 | itself. |
328 | |
329 | =cut |
330 | |