annotate Lib/IMPL/Web/Application/Resource.pm @ 335:e8be9062ecf2

improved resource classes, contracts are deprecated
author cin
date Thu, 13 Jun 2013 20:13:24 +0400
parents 71221d79e6b4
children ec58c47edb52
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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 Carp qw(carp);
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6 use IMPL::lang qw(:hash :base);
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7 use IMPL::Const qw(:prop);
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8 use IMPL::declare {
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9 require => {
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10 ViewResult => 'IMPL::Web::ViewResult',
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11 Exception => 'IMPL::Exception',
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12 ArgumentException => '-IMPL::InvalidArgumentException',
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13 OperationException => '-IMPL::InvalidOperationException',
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14 NotAllowedException => 'IMPL::Web::NotAllowedException',
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15 NotFoundException => 'IMPL::Web::NotFoundException',
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16 Loader => 'IMPL::Code::Loader',
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17 CustomResource => '-IMPL::Web::Application::CustomResource'
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18 },
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19 base => [
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20 'IMPL::Object' => undef,
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21 'IMPL::Web::Application::ResourceInterface' => undef
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22 ],
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23 props => [
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24 request => PROP_RO,
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25 application => PROP_RO,
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26 parent => PROP_RO,
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27 model => PROP_RO,
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28 id => PROP_RO,
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29 location => PROP_RO,
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30 ]
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31 };
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32
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33 sub CTOR {
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34 my ( $this, %args ) = @_;
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35
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36 die ArgumentException->new( id => 'A resource identifier is required' )
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37 unless $args{id};
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38
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39
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40 die ArgumentException->new(request => 'A request object must be specified')
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41 unless $args{request};
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42
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43 $this->request( $args{request} );
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44 $this->parent( $args{parent} );
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45 $this->model( $args{model} );
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46 $this->id( $args{id} );
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47 $this->application( $args{request}->application );
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48
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49 # если расположение явно не указано, то оно вычисляется автоматически,
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50 # либо остается не заданным
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51 $this->location( $args{location}
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52 || eval { $this->parent->location->Child( $this->id ) } );
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53 }
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54
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55 sub InvokeHttpVerb {
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56 my ( $this, $verb ) = @_;
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57
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58 my $operation = $this->verbs->{ lc($verb) };
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59
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60 die NotAllowedException->new(
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61 allow => join( ',', $this->GetAllowedMethods ) )
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62 unless $operation;
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63
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64 $this->AccessCheck($verb);
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65 my $request = $this->request;
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66
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67 # в случае, когда один ресурс вызывает HTTP метод другого ресурса, нужно
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68 # сохранить оригинальный resourceLocation
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69 $request->context->{resourceLocation} ||= $this->location;
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70
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71 # это свойство специфично только для REST приложений.
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72 # сохранение текущего ресурса не повлечет за собой существенных расходов,
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73 # т.к. они просто освободятся несколько позже.
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74 if ( not $request->context->{resource} ) {
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75 $request->context->{resource} = $this;
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76 $request->context->{environment} = sub {
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77 carp "using request environment is deprecated";
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78 $this->PrepareEnvironment()
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79 };
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80 }
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81
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82 return _InvokeDelegate( $operation, $this, $request );
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83 }
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84
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85 sub GetAllowedMethods {
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86
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87 }
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88
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89 sub FindChildResourceInfo {
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90
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91 }
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92
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93 sub AccessCheck {
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94
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95 }
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96
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97 sub PrepareEnvironment {
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98 my ($this) = @_;
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99
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100 my @stack;
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101 my $env = {};
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102
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103 for ( my $res = $this ; $res ; $res = $res->parent ) {
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104 push @stack, $res if $res->can('SetupEnvironment');
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105 }
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106
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107 map $_->SetupEnvironment($env), reverse @stack;
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108
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109 return $env;
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110 }
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111
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112 # это реализация по умолчанию, базируется информации о ресурсах, содержащийся
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113 # в контракте.
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114 sub FetchChildResource {
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115 my ( $this, $childId ) = @_;
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116
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117 $this->AccessCheck('FETCH');
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118
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119 my ( $info, $childIdParts ) =
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120 $this->FindChildResourceInfo($childId);
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121
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122 die NotFoundException->new( $this->location->url, $childId ) unless $info;
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123
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124 my %args;
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125
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126 my $binding = $info->{binding};
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127 my $contract = $info->{contract};
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128 if (ref($binding) eq 'HASH' ) {
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129 $args{$_} = _InvokeDelegate( $binding->{$_}, $this, @$childIdParts )
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130 foreach keys %$binding;
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131 } else {
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132 $args{model} = _InvokeDelegate( $binding, $this, @$childIdParts );
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133 }
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134
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135 # support for dynamic contracts
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136 if ( ref $contract eq 'CODE' || eval { $contract->can('Invoke') } ) {
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137 $contract = _InvokeDelegate( $contract, $this, $args{model} );
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138 }
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139
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140 die OperationException->new( "Can't fetch a contract for the resource",
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141 $childId )
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142 unless $contract;
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143
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144 $args{parent} = $this;
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145 $args{id} = $childId;
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146 $args{request} = $this->request;
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147
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148 my $factory;
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149
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150 if (ref($contract) eq 'HASH') {
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151 $factory = delete $contract->{class} || CustomResource;
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152 hashApply(\%args,$contract);
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153
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154 Loader->default->Require($factory)
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155 unless ref($factory);
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156 } else {
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157 die OperationException->new("Unsupported contract for the child resource '$childId'",$contract,$this->location);
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158 }
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159
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160 return $factory->new(%args);
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161 }
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162
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163 sub _InvokeDelegate {
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164 my $delegate = shift;
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165
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166 return $delegate->(@_) if ref $delegate eq 'CODE';
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167 return $delegate->Invoke(@_) if eval { $delegate->can('Invoke') };
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168 }
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169
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170 1;
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171
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172 __END__
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173
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174 =pod
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175
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176 =head1 NAME
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177
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178 C<IMPL::Web::Application::Resource> - Web-ресурс.
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179
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180 =head1 SYNOPSIS
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181
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182 Класс для внутреннего использования. Объединяет в себе контракт и модель данных.
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183 Основная задача - обработать поступающий от контроллера запрос на вызов C<HTTP>
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184 метода.
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185
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186 Экземпляры данного класса передаются в качестве параметров делегатам
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187 осуществляющим привязку к модели в C<IMPL::Web::Application::ResourceContract>
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188 и C<IMPL::Web::Application::OperationContract>.
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189
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190 =head1 DESCRIPTION
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191
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192 Весь функционал ресурса, поддерживаемые им C<HTTP> методы определяются
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193 контрактом. Однако можно реализовывать ресурсы, которые не имеют контракта
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194 или он отличается от того, что предоставляется стандартно
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195 C<IMPL::Web::Application::ResourceContract>.
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196
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197 Каждый ресурс является контейнером, тоесть позволяет получить дочерний ресурс
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198 по идентифифкатору, если таковой имеется, тоесть ресурс, у которого нет дочерних
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199 ресурсов на самом деле рассматривается как пустой контейнер.
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200
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201 С ресурсом непосредственно взаимодействует котроллер запросов
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202 C<IMPL::Web::Handler::RestController>, вызывая два метода.
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203
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204 =over
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205
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206 =item * C<FetchChildResource($childId)>
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207
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208 Данный метод возвращает дочерний ресурс, соответствующий C<$childId>.
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209 Текущая реализация использует метод C<FindChildResourceInfo> контракта текущего
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210 ресурса, после чего создает дочерний ресурс.
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211
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212 Если дочерний ресурс не найден, вызывается исключение
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213 C<IMPL::Web::NotFoundException>.
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214
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215 =item * C<InvokeHttpVerb($verb,$action)>
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216
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217 Обрабатывает запрос к ресурсу. Для этого используется контракт ресурса, в
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218 нем выбирается соответсвующий C<IMPL::Web::Application::OperationContract>.
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219 Затем найденный контракт для указанной операции используется для обработки
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220 запроса.
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221
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222 =back
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223
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224 Если объект реализует два вышеуказанных метода, он является веб-ресурсом, а
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225 детали его реализации, котнракт и прочее уже не важно, поэтому можно реализовать
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226 собственный класс ресурса, например унаследованный от
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227 C<IMPL::Web::Application::CustomResource>.
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228
230
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229 =head1 MEMBERS
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230
268
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231 =head2 C<[get]application>
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232
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233 Ссылка на приложение, к которому относится данный ресурс. Его следует задавать
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234 только для коренвых ресурсов, дочерние ресурсы получают это свойство от
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235 родителей.
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236
230
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237 =head2 C<[get]contract>
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238
248
814d755e5d12 Minor fixes
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239 Обязательное свойство для ресурса, ссылается, на контракт, соответствующий
230
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240 данному ресурсу, используется для выполнения C<HTTP> методов и получения
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241 дочерних ресурсов.
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242
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243 =head2 C<[get]id>
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244
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245 Обязательное свойство ресурса, идентифицирует его в родительском контейнере,
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246 для корневого ресурса может иметь произвольное значение.
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247
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248 =head2 C<[get]parent>
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249
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250 Ссылка на родительский ресурс, для корневого ресурса не определена.
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251
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252 =head2 C<[get]model>
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253
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254 Ссылка на объект предметной области, представляемый данным ресурсом. Данное
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255 свойство не является обязательным и может быть не задано.
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256
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257 =head2 C<[get]location>
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258
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259 Объект типа C<IMPL::Web::AutoLocator> или аналогичный описывающий адрес текущего
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260 ресурса, может быть как явно передан при создании ресурса, так и вычислен
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261 автоматически (только для ресурсов имеющих родителя). Следует заметить, что
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262 адрес ресурса не содержит параметров запроса, а только путь.
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263
268
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264 =head2 C<[get]FetchChildResource($id)>
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265
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266 Возвращает дочерний ресурс, по его идентификатору.
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267
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268 Данная реализация использует контракт текущего ресурса для поиска информации о
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269 дочернем ресурсе C<< $this->contract->FindChildResourceInfo($id) >>.
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270
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271 Затем осуществляется привязка к моделе, тоесть, выполняется делегат, для
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272 получения модели дочернего ресурса, а затем осуществляется привязка к контракту,
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273 при этом в делегат, который должен вернуть контракт дочернего ресурса передаются
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274 текущий ресурc и модель дочернего ресурса.
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275
229
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276 =cut