Mercurial > pub > Impl
annotate Lib/IMPL/Web/Application/Resource.pm @ 332:04a093f0a5a6
IMPL::Web::Application refactoring: resources are created per client request
author | cin |
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date | Sun, 09 Jun 2013 21:48:57 +0400 |
parents | fe725fad2d90 |
children | cd6409f66a5f |
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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 => { |
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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 request => PROP_RO, |
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21 application => PROP_RO, |
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22 parent => PROP_RO, |
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23 model => PROP_RO, |
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24 id => PROP_RO, |
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25 contract => PROP_RO, |
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26 location => PROP_RO, |
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27 ] |
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28 }; |
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29 |
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30 sub CTOR { |
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31 my ( $this, %args ) = @_; |
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32 |
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33 die ArgumentException->new( id => 'A resource identifier is required' ) |
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34 unless $args{id}; |
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35 die ArgumentException->new( contract => 'A contract is required' ) |
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36 unless $args{contract}; |
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37 |
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38 $this->request($args{action}) |
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39 or die ArgumentException->new(request => 'A request object must be specified'); |
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40 $this->parent( $args{parent} ); |
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41 $this->model( $args{model} ); |
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42 $this->id( $args{id} ); |
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43 $this->contract( $args{contract} ); |
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44 $this->application( $args{action}{application} ); |
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45 |
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46 # если расположение явно не указано, то оно вычисляется автоматически, |
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47 # либо остается не заданным |
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48 $this->location( $args{location} |
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49 || eval { $this->parent->location->Child( $this->id ) } ); |
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50 } |
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51 |
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52 sub InvokeHttpVerb { |
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53 my ( $this, $verb ) = @_; |
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54 |
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55 my $operation = $this->contract->verbs->{ lc($verb) }; |
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56 |
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57 die NotAllowedException->new( |
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58 allow => join( ',', map( uc, keys %{ $this->contract->verbs } ) ) ) |
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59 unless $operation; |
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60 |
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61 $this->AccessCheck($verb); |
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62 my $request = $this->request; |
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63 |
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64 # в случае, когда один ресурс вызывает HTTP метод другого ресурса, нужно |
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65 # сохранить оригинальный resourceLocation |
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66 $request->context->{resourceLocation} ||= $this->location; |
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67 |
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68 # это свойство специфично только для REST приложений. |
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69 # сохранение текущего ресурса не повлечет за собой существенных расходов, |
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70 # т.к. они просто освободятся несколько позже. |
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71 if ( not $request->context->{resource} ) { |
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72 $request->context->{resource} = $this; |
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73 $request->context->{environment} = sub { $this->PrepareEnvironment() }; |
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74 } |
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75 |
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76 return _InvokeDelegate( $operation, $this, $request ); |
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77 } |
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78 |
330 | 79 sub AccessCheck { |
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80 |
330 | 81 } |
82 | |
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83 sub PrepareEnvironment { |
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84 my ($this) = @_; |
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85 |
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86 my @stack; |
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87 my $env = {}; |
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88 |
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89 for ( my $res = $this ; $res ; $res = $res->parent ) { |
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90 push @stack, $res if $res->can('SetupEnvironment'); |
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91 } |
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92 |
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93 map $_->SetupEnvironment($env), reverse @stack; |
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94 |
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95 return $env; |
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96 } |
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97 |
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98 sub FindChildResourceInfo { |
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99 my ($this,$resourceId) = @_; |
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100 return $this->contract->FindChildResourceInfo($resourceId); |
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101 } |
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102 |
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103 # это реализация по умолчанию, базируется информации о ресурсах, содержащийся |
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104 # в контракте. |
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105 sub FetchChildResource { |
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106 my ( $this, $childId ) = @_; |
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107 |
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108 $this->AccessCheck('FETCH'); |
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109 |
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110 my ( $info, $childIdParts ) = |
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111 $this->FindChildResourceInfo($childId); |
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112 |
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113 die NotFoundException->new( $this->location->url, $childId ) unless $info; |
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114 |
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115 my %args; |
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116 |
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117 my $binding = $info->{binding}; |
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118 my $contract = $info->{contract}; |
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119 if (ref($binding) eq 'HASH' ) { |
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120 $args{$_} = _InvokeDelegate( $binding->{$_}, $this, @$childIdParts ) |
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121 foreach keys %$binding; |
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122 } else { |
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123 $args{model} = _InvokeDelegate( $binding, $this, @$childIdParts ); |
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124 } |
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125 |
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126 if ( ref $contract eq 'CODE' || $contract->can('Invoke') ) { |
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127 $contract = _InvokeDelegate( $contract, $this, $args{model} ); |
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128 $info->{contract} = $contract; |
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129 } |
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130 |
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131 die OperationException->new( "Can't fetch a contract for the resource", |
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132 $childId ) |
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133 unless $contract; |
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134 |
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135 $args{parent} = $this; |
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136 $args{id} = $childId; |
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137 $args{request} = $this->request; |
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138 |
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139 return $contract->CreateResource(%args); |
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140 } |
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141 |
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142 sub _InvokeDelegate { |
332
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143 my $delegate = shift; |
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144 |
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145 return $delegate->(@_) if ref $delegate eq 'CODE'; |
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146 return $delegate->Invoke(@_) if eval { $delegate->can('Invoke') }; |
229
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147 } |
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148 |
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149 1; |
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150 |
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151 __END__ |
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152 |
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153 =pod |
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154 |
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155 =head1 NAME |
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156 |
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157 C<IMPL::Web::Application::Resource> - Web-ресурс. |
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158 |
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159 =head1 SYNOPSIS |
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160 |
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161 Класс для внутреннего использования. Объединяет в себе контракт и модель данных. |
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162 Основная задача - обработать поступающий от контроллера запрос на вызов C<HTTP> |
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163 метода. |
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164 |
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165 Экземпляры данного класса передаются в качестве параметров делегатам |
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166 осуществляющим привязку к модели в C<IMPL::Web::Application::ResourceContract> |
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167 и C<IMPL::Web::Application::OperationContract>. |
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168 |
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169 =head1 DESCRIPTION |
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170 |
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171 Весь функционал ресурса, поддерживаемые им C<HTTP> методы определяются |
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172 контрактом. Однако можно реализовывать ресурсы, которые не имеют контракта |
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173 или он отличается от того, что предоставляется стандартно |
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174 C<IMPL::Web::Application::ResourceContract>. |
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175 |
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176 Каждый ресурс является контейнером, тоесть позволяет получить дочерний ресурс |
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177 по идентифифкатору, если таковой имеется, тоесть ресурс, у которого нет дочерних |
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178 ресурсов на самом деле рассматривается как пустой контейнер. |
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179 |
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180 С ресурсом непосредственно взаимодействует котроллер запросов |
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181 C<IMPL::Web::Handler::RestController>, вызывая два метода. |
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182 |
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183 =over |
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184 |
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185 =item * C<FetchChildResource($childId)> |
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186 |
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187 Данный метод возвращает дочерний ресурс, соответствующий C<$childId>. |
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188 Текущая реализация использует метод C<FindChildResourceInfo> контракта текущего |
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189 ресурса, после чего создает дочерний ресурс. |
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190 |
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191 Если дочерний ресурс не найден, вызывается исключение |
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192 C<IMPL::Web::NotFoundException>. |
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193 |
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194 =item * C<InvokeHttpVerb($verb,$action)> |
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195 |
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196 Обрабатывает запрос к ресурсу. Для этого используется контракт ресурса, в |
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197 нем выбирается соответсвующий C<IMPL::Web::Application::OperationContract>. |
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198 Затем найденный контракт для указанной операции используется для обработки |
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199 запроса. |
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200 |
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201 =back |
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202 |
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203 Если объект реализует два вышеуказанных метода, он является веб-ресурсом, а |
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204 детали его реализации, котнракт и прочее уже не важно, поэтому можно реализовать |
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205 собственный класс ресурса, например унаследованный от |
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206 C<IMPL::Web::Application::CustomResource>. |
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207 |
230 | 208 =head1 MEMBERS |
209 | |
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210 =head2 C<[get]application> |
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211 |
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212 Ссылка на приложение, к которому относится данный ресурс. Его следует задавать |
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213 только для коренвых ресурсов, дочерние ресурсы получают это свойство от |
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214 родителей. |
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215 |
230 | 216 =head2 C<[get]contract> |
217 | |
248 | 218 Обязательное свойство для ресурса, ссылается, на контракт, соответствующий |
230 | 219 данному ресурсу, используется для выполнения C<HTTP> методов и получения |
220 дочерних ресурсов. | |
221 | |
222 =head2 C<[get]id> | |
223 | |
224 Обязательное свойство ресурса, идентифицирует его в родительском контейнере, | |
225 для корневого ресурса может иметь произвольное значение. | |
226 | |
227 =head2 C<[get]parent> | |
228 | |
229 Ссылка на родительский ресурс, для корневого ресурса не определена. | |
230 | |
231 =head2 C<[get]model> | |
232 | |
233 Ссылка на объект предметной области, представляемый данным ресурсом. Данное | |
234 свойство не является обязательным и может быть не задано. | |
235 | |
236 =head2 C<[get]location> | |
237 | |
238 Объект типа C<IMPL::Web::AutoLocator> или аналогичный описывающий адрес текущего | |
239 ресурса, может быть как явно передан при создании ресурса, так и вычислен | |
240 автоматически (только для ресурсов имеющих родителя). Следует заметить, что | |
241 адрес ресурса не содержит параметров запроса, а только путь. | |
242 | |
268
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243 =head2 C<[get]FetchChildResource($id)> |
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244 |
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245 Возвращает дочерний ресурс, по его идентификатору. |
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246 |
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247 Данная реализация использует контракт текущего ресурса для поиска информации о |
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248 дочернем ресурсе C<< $this->contract->FindChildResourceInfo($id) >>. |
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249 |
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250 Затем осуществляется привязка к моделе, тоесть, выполняется делегат, для |
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251 получения модели дочернего ресурса, а затем осуществляется привязка к контракту, |
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252 при этом в делегат, который должен вернуть контракт дочернего ресурса передаются |
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253 текущий ресурc и модель дочернего ресурса. |
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254 |
229
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255 =cut |