Mercurial > pub > Impl
annotate Lib/IMPL/Web/Application/Resource.pm @ 238:b8c724f6de36
DOM model refactoring
TT view refactoring, controls are no longer derived from DOM nodes
bugfixes
author | sergey |
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date | Tue, 16 Oct 2012 01:33:06 +0400 |
parents | 6d8092d8ce1b |
children | a02b110da931 |
rev | line source |
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1 package IMPL::Web::Application::Resource; |
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2 use strict; |
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3 |
230 | 4 use IMPL::Const qw(:prop); |
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5 use IMPL::declare { |
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6 require => { |
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7 Exception => 'IMPL::Exception', |
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8 ArgumentException => '-IMPL::InvalidArgumentException', |
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9 OperationException => '-IMPL::InvalidOperationException', |
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10 NotAllowedException => 'IMPL::Web::NotAllowedException', |
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11 NotFoundException => 'IMPL::Web::NotFoundException' |
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12 }, |
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13 base => [ |
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14 'IMPL::Object' => undef, |
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15 'IMPL::Web::Application::ResourceInterface' => undef |
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16 ], |
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17 props => [ |
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18 parent => PROP_GET | PROP_OWNERSET, |
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19 model => PROP_GET | PROP_OWNERSET, |
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20 id => PROP_GET | PROP_OWNERSET, |
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21 contract => PROP_GET | PROP_OWNERSET, |
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22 location => PROP_GET | PROP_OWNERSET |
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23 ] |
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24 }; |
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25 |
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26 sub CTOR { |
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27 my ( $this, %args ) = @_; |
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28 |
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29 die ArgumentException->new( id => 'A resource identifier is required' ) |
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30 unless $args{id}; |
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31 die ArgumentException->new( contract => 'A contract is required' ) |
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32 unless $args{id}; |
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33 |
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34 $this->parent( $args{parent} ); |
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35 $this->model( $args{model} ); |
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36 $this->id( $args{id} ); |
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37 $this->contract( $args{contract} ); |
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38 |
230 | 39 # если расположение явно не указано, то оно вычисляется автоматически, |
40 # либо остается не заданным | |
41 $this->location( $args{location} || eval { $this->parent->location->Child( $this->id ) } ); | |
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42 } |
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43 |
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44 sub InvokeHttpVerb { |
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45 my ( $this, $verb, $action ) = @_; |
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46 |
230 | 47 my $operation = $this->contract->verbs->{ lc($verb) }; |
48 | |
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49 die NotAllowedException->new( |
230 | 50 allow => join( ',', map( uc, keys %{ $this->contract->verbs } ) ) |
51 ) | |
52 unless $operation; | |
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53 |
230 | 54 return $operation->Invoke( $this, $action ); |
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55 } |
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56 |
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57 # это реализация по умолчанию, базируется информации о ресурсах, содержащийся |
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58 # в контракте. |
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59 sub FetchChildResource { |
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60 my ( $this, $childId ) = @_; |
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61 |
230 | 62 my ($info,$childIdParts) = $this->contract->FindChildResourceInfo($childId); |
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63 |
230 | 64 die NotFoundException->new($this->location->url,$childId) unless $info; |
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65 |
230 | 66 my $binding = $info->{binding}; |
67 my $contract = $info->{contract} | |
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68 or die OperationException->new("Can't fetch a contract for the resource", $childId); |
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69 |
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70 my %args = ( |
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71 parent => $this, |
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72 id => $childId |
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73 ); |
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74 |
230 | 75 $args{model} = _InvokeDelegate($binding,$this,@$childIdParts); |
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76 |
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77 return $contract->CreateResource(%args); |
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78 } |
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79 |
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80 sub _InvokeDelegate { |
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81 my $delegate = shift; |
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82 |
230 | 83 return $delegate->(@_) if ref $delegate eq 'CODE'; |
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84 return $delegate->Invoke(@_) if eval { $delegate->can('Invoke')}; |
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85 } |
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86 |
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87 1; |
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88 |
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89 __END__ |
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90 |
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91 =pod |
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92 |
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93 =head1 NAME |
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94 |
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95 C<IMPL::Web::Application::Resource> - Web-ресурс. |
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96 |
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97 =head1 SYNOPSIS |
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98 |
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99 Класс для внутреннего использования. Объединяет в себе контракт и модель данных. |
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100 Основная задача - обработать поступающий от контроллера запрос на вызов C<HTTP> |
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101 метода. |
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102 |
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103 Экземпляры данного класса передаются в качестве параметров делегатам |
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104 осуществляющим привязку к модели в C<IMPL::Web::Application::ResourceContract> |
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105 и C<IMPL::Web::Application::OperationContract>. |
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106 |
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107 =head1 DESCRIPTION |
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108 |
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109 Весь функционал ресурса, поддерживаемые им C<HTTP> методы определяются |
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110 контрактом. Однако можно реализовывать ресурсы, которые не имеют контракта |
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111 или он отличается от того, что предоставляется стандартно |
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112 C<IMPL::Web::Application::ResourceContract>. |
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113 |
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114 Каждый ресурс является контейнером, тоесть позволяет получить дочерний ресурс |
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115 по идентифифкатору, если таковой имеется, тоесть ресурс, у которого нет дочерних |
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116 ресурсов на самом деле рассматривается как пустой контейнер. |
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117 |
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118 С ресурсом непосредственно взаимодействует котроллер запросов |
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119 C<IMPL::Web::Handler::RestController>, вызывая два метода. |
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120 |
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121 =over |
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122 |
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123 =item * C<FetchChildResource($childId)> |
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124 |
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125 Данный метод возвращает дочерний ресурс, соответствующий C<$childId>. |
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126 Текущая реализация использует метод C<FindChildResourceInfo> контракта текущего |
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127 ресурса, после чего создает дочерний ресурс. |
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128 |
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129 Если дочерний ресурс не найден, вызывается исключение |
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130 C<IMPL::Web::NotFoundException>. |
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131 |
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132 =item * C<InvokeHttpVerb($verb,$action)> |
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133 |
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134 Обрабатывает запрос к ресурсу. Для этого используется контракт ресурса, в |
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135 нем выбирается соответсвующий C<IMPL::Web::Application::OperationContract>. |
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136 Затем найденный контракт для указанной операции используется для обработки |
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137 запроса. |
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138 |
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139 =back |
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140 |
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141 Если объект реализует два вышеуказанных метода, он является веб-ресурсом, а |
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142 детали его реализации, котнракт и прочее уже не важно, поэтому можно реализовать |
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143 собственный класс ресурса, например унаследованный от |
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144 C<IMPL::Web::Application::CustomResource>. |
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145 |
230 | 146 =head1 MEMBERS |
147 | |
148 =head2 C<[get]contract> | |
149 | |
150 Обязательное свойство для ресурса, ссылается, на контракт, соотсетствующий | |
151 данному ресурсу, используется для выполнения C<HTTP> методов и получения | |
152 дочерних ресурсов. | |
153 | |
154 =head2 C<[get]id> | |
155 | |
156 Обязательное свойство ресурса, идентифицирует его в родительском контейнере, | |
157 для корневого ресурса может иметь произвольное значение. | |
158 | |
159 =head2 C<[get]parent> | |
160 | |
161 Ссылка на родительский ресурс, для корневого ресурса не определена. | |
162 | |
163 =head2 C<[get]model> | |
164 | |
165 Ссылка на объект предметной области, представляемый данным ресурсом. Данное | |
166 свойство не является обязательным и может быть не задано. | |
167 | |
168 =head2 C<[get]location> | |
169 | |
170 Объект типа C<IMPL::Web::AutoLocator> или аналогичный описывающий адрес текущего | |
171 ресурса, может быть как явно передан при создании ресурса, так и вычислен | |
172 автоматически (только для ресурсов имеющих родителя). Следует заметить, что | |
173 адрес ресурса не содержит параметров запроса, а только путь. | |
174 | |
229
47f77e6409f7
heavily reworked the resource model of the web application:
sergey
parents:
diff
changeset
|
175 =cut |