Mercurial > pub > Impl
annotate Lib/IMPL/Web/Application/Resource.pm @ 295:9b25e1f50144
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date | Fri, 01 Mar 2013 03:15:30 +0400 |
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1 package IMPL::Web::Application::Resource; |
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2 use strict; |
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3 |
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4 use URI; |
230 | 5 use IMPL::Const qw(:prop); |
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6 use IMPL::declare { |
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7 require => { |
244 | 8 ViewResult => 'IMPL::Web::ViewResult', |
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9 Exception => 'IMPL::Exception', |
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10 ArgumentException => '-IMPL::InvalidArgumentException', |
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11 OperationException => '-IMPL::InvalidOperationException', |
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12 NotAllowedException => 'IMPL::Web::NotAllowedException', |
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13 NotFoundException => 'IMPL::Web::NotFoundException' |
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14 }, |
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15 base => [ |
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16 'IMPL::Object' => undef, |
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17 'IMPL::Web::Application::ResourceInterface' => undef |
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18 ], |
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19 props => [ |
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20 application => PROP_RO, |
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21 parent => PROP_RO, |
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22 model => PROP_RO, |
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23 id => PROP_RO, |
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24 contract => PROP_RO, |
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25 location => PROP_RO, |
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26 ] |
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27 }; |
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28 |
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29 sub CTOR { |
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30 my ( $this, %args ) = @_; |
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31 |
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32 die ArgumentException->new( id => 'A resource identifier is required' ) |
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33 unless $args{id}; |
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34 die ArgumentException->new( contract => 'A contract is required' ) |
255 | 35 unless $args{contract}; |
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36 |
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37 $this->parent( $args{parent} ); |
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38 $this->model( $args{model} ); |
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39 $this->id( $args{id} ); |
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40 $this->contract( $args{contract} ); |
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41 $this->application( $args{application} || ($args{parent} && $args{parent}->application) ); |
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42 |
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43 # если расположение явно не указано, то оно вычисляется автоматически, |
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44 # либо остается не заданным |
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45 $this->location( $args{location} |
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46 || eval { $this->parent->location->Child( $this->id ) } ); |
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47 } |
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48 |
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49 sub InvokeHttpVerb { |
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50 my ( $this, $verb, $action ) = @_; |
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51 |
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52 my $operation = $this->contract->verbs->{ lc($verb) }; |
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53 |
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54 die NotAllowedException->new( |
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55 allow => join( ',', map( uc, keys %{ $this->contract->verbs } ) ) ) |
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56 unless $operation; |
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57 |
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58 # в случае, когда один ресурс вызывает HTTP метод другого ресурса, нужно |
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59 # сохранить оригинальный resourceLocation |
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60 $action->context->{resourceLocation} ||= $this->location; |
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61 |
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62 # это свойство специфично только для REST приложений. |
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63 # сохранение текущего ресурса не повлечет за собой существенных расходов, |
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64 # т.к. они просто освободятся несколько позже. |
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65 if(not $action->context->{resource}) { |
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66 $action->context->{resource} = $this; |
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67 $action->context->{environment} = sub { $this->PrepareEnvironment() }; |
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68 } |
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69 |
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70 return _InvokeDelegate($operation, $this, $action ); |
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71 } |
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72 |
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73 sub PrepareEnvironment { |
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74 my ($this) = @_; |
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75 |
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76 my @stack; |
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77 my $env = {}; |
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78 |
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79 for(my $res = $this; $res; $res = $res->parent) { |
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80 push @stack,$res if $res->can('SetupEnvironment'); |
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81 } |
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82 |
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83 map $_->SetupEnvironment($env), reverse @stack; |
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84 |
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85 return $env; |
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86 } |
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87 |
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88 # это реализация по умолчанию, базируется информации о ресурсах, содержащийся |
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89 # в контракте. |
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90 sub FetchChildResource { |
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91 my ( $this, $childId ) = @_; |
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92 |
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93 my ( $info, $childIdParts ) = |
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94 $this->contract->FindChildResourceInfo($childId); |
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95 |
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96 die NotFoundException->new( $this->location->url, $childId ) unless $info; |
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97 |
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98 my $binding = $info->{binding}; |
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99 my $contract = $info->{contract}; |
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100 my $model = _InvokeDelegate( $binding, $this, @$childIdParts ); |
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101 |
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102 if ( ref $contract eq 'CODE' || $contract->can('Invoke')) { |
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103 $contract = _InvokeDelegate($contract,$this,$model); |
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104 $info->{contract} = $contract; |
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105 } |
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106 |
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107 die OperationException->new( "Can't fetch a contract for the resource", |
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108 $childId ) |
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109 unless $contract; |
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110 |
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111 my %args = ( |
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112 parent => $this, |
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113 id => $childId, |
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114 model => $model |
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115 ); |
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116 |
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117 return $contract->CreateResource(%args); |
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118 } |
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119 |
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120 sub _InvokeDelegate { |
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121 my $delegate = shift; |
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122 |
230 | 123 return $delegate->(@_) if ref $delegate eq 'CODE'; |
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124 return $delegate->Invoke(@_) if eval { $delegate->can('Invoke') }; |
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125 } |
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126 |
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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 =pod |
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132 |
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133 =head1 NAME |
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134 |
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135 C<IMPL::Web::Application::Resource> - Web-ресурс. |
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136 |
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137 =head1 SYNOPSIS |
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138 |
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139 Класс для внутреннего использования. Объединяет в себе контракт и модель данных. |
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140 Основная задача - обработать поступающий от контроллера запрос на вызов C<HTTP> |
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141 метода. |
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142 |
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143 Экземпляры данного класса передаются в качестве параметров делегатам |
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144 осуществляющим привязку к модели в C<IMPL::Web::Application::ResourceContract> |
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145 и C<IMPL::Web::Application::OperationContract>. |
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146 |
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147 =head1 DESCRIPTION |
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148 |
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149 Весь функционал ресурса, поддерживаемые им C<HTTP> методы определяются |
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150 контрактом. Однако можно реализовывать ресурсы, которые не имеют контракта |
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151 или он отличается от того, что предоставляется стандартно |
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152 C<IMPL::Web::Application::ResourceContract>. |
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153 |
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154 Каждый ресурс является контейнером, тоесть позволяет получить дочерний ресурс |
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155 по идентифифкатору, если таковой имеется, тоесть ресурс, у которого нет дочерних |
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156 ресурсов на самом деле рассматривается как пустой контейнер. |
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157 |
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158 С ресурсом непосредственно взаимодействует котроллер запросов |
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159 C<IMPL::Web::Handler::RestController>, вызывая два метода. |
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160 |
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161 =over |
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162 |
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163 =item * C<FetchChildResource($childId)> |
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164 |
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165 Данный метод возвращает дочерний ресурс, соответствующий C<$childId>. |
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166 Текущая реализация использует метод C<FindChildResourceInfo> контракта текущего |
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167 ресурса, после чего создает дочерний ресурс. |
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168 |
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169 Если дочерний ресурс не найден, вызывается исключение |
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170 C<IMPL::Web::NotFoundException>. |
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171 |
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172 =item * C<InvokeHttpVerb($verb,$action)> |
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173 |
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174 Обрабатывает запрос к ресурсу. Для этого используется контракт ресурса, в |
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175 нем выбирается соответсвующий C<IMPL::Web::Application::OperationContract>. |
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176 Затем найденный контракт для указанной операции используется для обработки |
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177 запроса. |
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178 |
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179 =back |
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180 |
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181 Если объект реализует два вышеуказанных метода, он является веб-ресурсом, а |
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182 детали его реализации, котнракт и прочее уже не важно, поэтому можно реализовать |
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183 собственный класс ресурса, например унаследованный от |
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184 C<IMPL::Web::Application::CustomResource>. |
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185 |
230 | 186 =head1 MEMBERS |
187 | |
268
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188 =head2 C<[get]application> |
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189 |
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190 Ссылка на приложение, к которому относится данный ресурс. Его следует задавать |
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191 только для коренвых ресурсов, дочерние ресурсы получают это свойство от |
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192 родителей. |
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193 |
230 | 194 =head2 C<[get]contract> |
195 | |
248 | 196 Обязательное свойство для ресурса, ссылается, на контракт, соответствующий |
230 | 197 данному ресурсу, используется для выполнения C<HTTP> методов и получения |
198 дочерних ресурсов. | |
199 | |
200 =head2 C<[get]id> | |
201 | |
202 Обязательное свойство ресурса, идентифицирует его в родительском контейнере, | |
203 для корневого ресурса может иметь произвольное значение. | |
204 | |
205 =head2 C<[get]parent> | |
206 | |
207 Ссылка на родительский ресурс, для корневого ресурса не определена. | |
208 | |
209 =head2 C<[get]model> | |
210 | |
211 Ссылка на объект предметной области, представляемый данным ресурсом. Данное | |
212 свойство не является обязательным и может быть не задано. | |
213 | |
214 =head2 C<[get]location> | |
215 | |
216 Объект типа C<IMPL::Web::AutoLocator> или аналогичный описывающий адрес текущего | |
217 ресурса, может быть как явно передан при создании ресурса, так и вычислен | |
218 автоматически (только для ресурсов имеющих родителя). Следует заметить, что | |
219 адрес ресурса не содержит параметров запроса, а только путь. | |
220 | |
268
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221 =head2 C<[get]FetchChildResource($id)> |
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222 |
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223 Возвращает дочерний ресурс, по его идентификатору. |
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224 |
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225 Данная реализация использует контракт текущего ресурса для поиска информации о |
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226 дочернем ресурсе C<< $this->contract->FindChildResourceInfo($id) >>. |
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227 |
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228 Затем осуществляется привязка к моделе, тоесть, выполняется делегат, для |
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229 получения модели дочернего ресурса, а затем осуществляется привязка к контракту, |
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230 при этом в делегат, который должен вернуть контракт дочернего ресурса передаются |
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231 текущий ресурc и модель дочернего ресурса. |
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232 |
229
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233 =cut |