Mercurial > pub > Impl
annotate Lib/IMPL/Web/Application/Resource.pm @ 254:fb52014f6931
updated web-session creation
author | sergey |
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date | Thu, 06 Dec 2012 19:58:42 +0400 |
parents | 814d755e5d12 |
children | 827cf96faa1c |
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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 => { |
244 | 7 ViewResult => 'IMPL::Web::ViewResult', |
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8 Exception => 'IMPL::Exception', |
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9 ArgumentException => '-IMPL::InvalidArgumentException', |
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10 OperationException => '-IMPL::InvalidOperationException', |
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11 NotAllowedException => 'IMPL::Web::NotAllowedException', |
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12 NotFoundException => 'IMPL::Web::NotFoundException' |
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13 }, |
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14 base => [ |
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15 'IMPL::Object' => undef, |
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16 'IMPL::Web::Application::ResourceInterface' => undef |
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17 ], |
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18 props => [ |
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19 parent => PROP_GET | PROP_OWNERSET, |
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20 model => PROP_GET | PROP_OWNERSET, |
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21 id => PROP_GET | PROP_OWNERSET, |
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22 contract => PROP_GET | PROP_OWNERSET, |
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23 location => PROP_GET | PROP_OWNERSET |
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24 ] |
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25 }; |
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26 |
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27 sub CTOR { |
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28 my ( $this, %args ) = @_; |
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29 |
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30 die ArgumentException->new( id => 'A resource identifier is required' ) |
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31 unless $args{id}; |
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32 die ArgumentException->new( contract => 'A contract is required' ) |
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33 unless $args{id}; |
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34 |
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35 $this->parent( $args{parent} ); |
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36 $this->model( $args{model} ); |
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37 $this->id( $args{id} ); |
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38 $this->contract( $args{contract} ); |
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39 |
230 | 40 # если расположение явно не указано, то оно вычисляется автоматически, |
41 # либо остается не заданным | |
42 $this->location( $args{location} || eval { $this->parent->location->Child( $this->id ) } ); | |
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43 } |
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44 |
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45 sub InvokeHttpVerb { |
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46 my ( $this, $verb, $action ) = @_; |
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47 |
230 | 48 my $operation = $this->contract->verbs->{ lc($verb) }; |
49 | |
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50 die NotAllowedException->new( |
230 | 51 allow => join( ',', map( uc, keys %{ $this->contract->verbs } ) ) |
52 ) | |
53 unless $operation; | |
245 | 54 |
55 # в случае, когда один ресурс вызывает HTTP метод другого ресурса, нужно | |
56 # сохранить оригинальный resourceLocation | |
57 $action->context->{resourceLocation} ||= $this->location; | |
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58 |
230 | 59 return $operation->Invoke( $this, $action ); |
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60 } |
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61 |
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62 # это реализация по умолчанию, базируется информации о ресурсах, содержащийся |
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63 # в контракте. |
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64 sub FetchChildResource { |
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65 my ( $this, $childId ) = @_; |
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66 |
230 | 67 my ($info,$childIdParts) = $this->contract->FindChildResourceInfo($childId); |
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68 |
230 | 69 die NotFoundException->new($this->location->url,$childId) unless $info; |
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70 |
230 | 71 my $binding = $info->{binding}; |
248 | 72 my $contract = $info->{contract}; |
73 | |
74 if (ref $contract eq 'CODE') { | |
75 $contract = $contract->(); | |
76 $info->{contract} = $contract; | |
77 } | |
78 | |
79 die OperationException->new("Can't fetch a contract for the resource", $childId) | |
80 unless $contract; | |
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81 |
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82 my %args = ( |
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83 parent => $this, |
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84 id => $childId |
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85 ); |
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86 |
230 | 87 $args{model} = _InvokeDelegate($binding,$this,@$childIdParts); |
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88 |
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89 return $contract->CreateResource(%args); |
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90 } |
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91 |
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92 sub _InvokeDelegate { |
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93 my $delegate = shift; |
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94 |
230 | 95 return $delegate->(@_) if ref $delegate eq 'CODE'; |
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96 return $delegate->Invoke(@_) if eval { $delegate->can('Invoke')}; |
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97 } |
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98 |
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99 1; |
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100 |
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101 __END__ |
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102 |
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103 =pod |
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104 |
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105 =head1 NAME |
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106 |
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107 C<IMPL::Web::Application::Resource> - Web-ресурс. |
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108 |
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109 =head1 SYNOPSIS |
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110 |
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111 Класс для внутреннего использования. Объединяет в себе контракт и модель данных. |
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112 Основная задача - обработать поступающий от контроллера запрос на вызов C<HTTP> |
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113 метода. |
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114 |
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115 Экземпляры данного класса передаются в качестве параметров делегатам |
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116 осуществляющим привязку к модели в C<IMPL::Web::Application::ResourceContract> |
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117 и C<IMPL::Web::Application::OperationContract>. |
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118 |
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119 =head1 DESCRIPTION |
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120 |
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121 Весь функционал ресурса, поддерживаемые им C<HTTP> методы определяются |
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122 контрактом. Однако можно реализовывать ресурсы, которые не имеют контракта |
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123 или он отличается от того, что предоставляется стандартно |
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124 C<IMPL::Web::Application::ResourceContract>. |
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125 |
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126 Каждый ресурс является контейнером, тоесть позволяет получить дочерний ресурс |
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127 по идентифифкатору, если таковой имеется, тоесть ресурс, у которого нет дочерних |
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128 ресурсов на самом деле рассматривается как пустой контейнер. |
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129 |
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130 С ресурсом непосредственно взаимодействует котроллер запросов |
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131 C<IMPL::Web::Handler::RestController>, вызывая два метода. |
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132 |
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133 =over |
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134 |
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135 =item * C<FetchChildResource($childId)> |
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136 |
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137 Данный метод возвращает дочерний ресурс, соответствующий C<$childId>. |
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138 Текущая реализация использует метод C<FindChildResourceInfo> контракта текущего |
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139 ресурса, после чего создает дочерний ресурс. |
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140 |
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141 Если дочерний ресурс не найден, вызывается исключение |
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142 C<IMPL::Web::NotFoundException>. |
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143 |
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144 =item * C<InvokeHttpVerb($verb,$action)> |
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145 |
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146 Обрабатывает запрос к ресурсу. Для этого используется контракт ресурса, в |
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147 нем выбирается соответсвующий C<IMPL::Web::Application::OperationContract>. |
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148 Затем найденный контракт для указанной операции используется для обработки |
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149 запроса. |
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150 |
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151 =back |
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152 |
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153 Если объект реализует два вышеуказанных метода, он является веб-ресурсом, а |
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154 детали его реализации, котнракт и прочее уже не важно, поэтому можно реализовать |
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155 собственный класс ресурса, например унаследованный от |
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156 C<IMPL::Web::Application::CustomResource>. |
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157 |
230 | 158 =head1 MEMBERS |
159 | |
160 =head2 C<[get]contract> | |
161 | |
248 | 162 Обязательное свойство для ресурса, ссылается, на контракт, соответствующий |
230 | 163 данному ресурсу, используется для выполнения C<HTTP> методов и получения |
164 дочерних ресурсов. | |
165 | |
166 =head2 C<[get]id> | |
167 | |
168 Обязательное свойство ресурса, идентифицирует его в родительском контейнере, | |
169 для корневого ресурса может иметь произвольное значение. | |
170 | |
171 =head2 C<[get]parent> | |
172 | |
173 Ссылка на родительский ресурс, для корневого ресурса не определена. | |
174 | |
175 =head2 C<[get]model> | |
176 | |
177 Ссылка на объект предметной области, представляемый данным ресурсом. Данное | |
178 свойство не является обязательным и может быть не задано. | |
179 | |
180 =head2 C<[get]location> | |
181 | |
182 Объект типа C<IMPL::Web::AutoLocator> или аналогичный описывающий адрес текущего | |
183 ресурса, может быть как явно передан при создании ресурса, так и вычислен | |
184 автоматически (только для ресурсов имеющих родителя). Следует заметить, что | |
185 адрес ресурса не содержит параметров запроса, а только путь. | |
186 | |
229
47f77e6409f7
heavily reworked the resource model of the web application:
sergey
parents:
diff
changeset
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187 =cut |