annotate Lib/IMPL/Web/Application/Resource.pm @ 285:546957c50a36

*IMPL::Web::Handler::TTView Reworked template selection mechanism *IMPL::Web::Application: refactoring -Removed obsolete IMPL::Text modules
author cin
date Mon, 18 Feb 2013 02:55:59 +0400
parents 4abda21186cd
children fe725fad2d90
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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;
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5 use IMPL::Const qw(:prop);
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6 use IMPL::declare {
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7 require => {
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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' )
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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
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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
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186 =head1 MEMBERS
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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
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194 =head2 C<[get]contract>
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195
248
814d755e5d12 Minor fixes
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196 Обязательное свойство для ресурса, ссылается, на контракт, соответствующий
230
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197 данному ресурсу, используется для выполнения C<HTTP> методов и получения
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198 дочерних ресурсов.
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199
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200 =head2 C<[get]id>
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201
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202 Обязательное свойство ресурса, идентифицирует его в родительском контейнере,
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203 для корневого ресурса может иметь произвольное значение.
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204
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205 =head2 C<[get]parent>
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206
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207 Ссылка на родительский ресурс, для корневого ресурса не определена.
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208
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209 =head2 C<[get]model>
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210
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211 Ссылка на объект предметной области, представляемый данным ресурсом. Данное
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212 свойство не является обязательным и может быть не задано.
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213
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214 =head2 C<[get]location>
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215
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216 Объект типа C<IMPL::Web::AutoLocator> или аналогичный описывающий адрес текущего
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217 ресурса, может быть как явно передан при создании ресурса, так и вычислен
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218 автоматически (только для ресурсов имеющих родителя). Следует заметить, что
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219 адрес ресурса не содержит параметров запроса, а только путь.
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220
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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