annotate Lib/IMPL/Web/Application/ResourceBase.pm @ 400:ef37ec102dab

redirection support while fetching child resources
author cin
date Wed, 14 May 2014 17:27:32 +0400
parents 2c14f66efa08
children
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1 package IMPL::Web::Application::ResourceBase;
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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
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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
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16 },
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17 base => [
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18 'IMPL::Object' => undef,
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19 'IMPL::Web::Application::ResourceInterface' => undef
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20 ],
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21 props => [
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22 request => PROP_RO,
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23 application => PROP_RO,
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24 parent => PROP_RO,
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25 model => PROP_RO,
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26 id => PROP_RO,
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27 location => PROP_RO,
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28 role => PROP_RO | PROP_LIST
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29 ]
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30 };
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31
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32 sub CTOR {
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33 my ( $this, %args ) = @_;
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34
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35 die ArgumentException->new(request => 'A request object must be specified')
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36 unless $args{request};
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37
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38 $this->request( $args{request} );
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39 $this->parent( $args{parent} ) if $args{parent};
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40 $this->model( $args{model} ) if $args{model};
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41 $this->id( $args{id} ) if $args{id};
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42 $this->application( $args{request}->application );
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43
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44 # если расположение явно не указано, то оно вычисляется автоматически,
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45 # либо остается не заданным
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46 $this->location( $args{location}
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47 || eval { $this->parent->location->Child( $this->id ) } );
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48
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49 if (my $role = $args{role}) {
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50 if (ref($role) eq 'ARRAY') {
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51 $this->role($role);
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52 } elsif (not ref($role)) {
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53 $this->role(split(/\s+/, $role));
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54 } else {
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55 die ArgumentException->new( role => 'A invalid value is provided, expected ARRAY or SCALAR');
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56 }
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57 }
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58 }
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59
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60 sub InvokeHttpVerb {
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61 my ( $this, $verb ) = @_;
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62
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63 my $operation = $this->verbs->{ lc($verb) };
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64
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65 die NotAllowedException->new(
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66 allow => join( ',', $this->GetAllowedMethods ) )
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67 unless $operation;
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68
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69 $this->AccessCheck($verb);
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70 my $request = $this->request;
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71
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72 # в случае, когда один ресурс вызывает HTTP метод другого ресурса, нужно
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73 # сохранить оригинальный resourceLocation
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74 $request->context->{resourceLocation} ||= $this->location;
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75
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76 # это свойство специфично только для REST приложений.
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77 # сохранение текущего ресурса не повлечет за собой существенных расходов,
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78 # т.к. они просто освободятся несколько позже.
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79 if ( not $request->context->{resource} ) {
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80 $request->context->{resource} = $this;
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81 }
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82
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83 return _InvokeDelegate( $operation, $this, $request );
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84 }
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85
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86 sub security {
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87 shift->request->security
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88 }
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89
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90 sub context {
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91 shift->request->context
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92 }
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93
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94 sub verbs {
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95 {} # возвращаем пстой список операций
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96 }
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97
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98 sub GetAllowedMethods {
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99 map( uc, keys %{ shift->verbs } );
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100 }
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101
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102 sub AccessCheck {
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103
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104 }
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105
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106 sub Seek {
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107 my ($this, $role) = @_;
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108
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109 my @roles;
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110
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111 if (ref($role) eq 'ARRAY') {
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112 @roles = @{$role};
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113 } elsif (not ref($role)) {
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114 @roles = split(/\s+/, $role);
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115 } else {
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116 die ArgumentException->new( role => 'A invalid value is provided, expected ARRAY or SCALAR');
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117 }
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118
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119
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120 for(my $r = $this; $r; $r = $r->parent) {
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121 return $r if $r->HasRole(@roles);
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122 }
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123 return;
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124 }
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125
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126 sub HasRole {
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127 my ($this, @roles) = @_;
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128 my %cache = map { $_, 1 } @{$this->role};
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129 return scalar(grep not($cache{$_}), @roles) ? 0 : 1;
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130 }
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131
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132 sub _InvokeDelegate {
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133 my $delegate = shift;
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134
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135 return $delegate->(@_) if ref $delegate eq 'CODE';
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136 return $delegate->Invoke(@_) if eval { $delegate->can('Invoke') };
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137 }
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138
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139 1;
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140
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141 __END__
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142
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143 =pod
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144
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145 =head1 NAME
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146
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147 C<IMPL::Web::Application::Resource> - Web-ресурс.
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148
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149 =head1 SYNOPSIS
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150
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151 Класс для внутреннего использования. Объединяет в себе контракт и модель данных.
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152 Основная задача - обработать поступающий от контроллера запрос на вызов C<HTTP>
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153 метода.
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154
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155 Экземпляры данного класса передаются в качестве параметров делегатам
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156 осуществляющим привязку к модели в C<IMPL::Web::Application::ResourceContract>
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157 и C<IMPL::Web::Application::OperationContract>.
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158
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159 =head1 DESCRIPTION
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160
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161 Весь функционал ресурса, поддерживаемые им C<HTTP> методы определяются
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162 контрактом. Однако можно реализовывать ресурсы, которые не имеют контракта
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163 или он отличается от того, что предоставляется стандартно
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164 C<IMPL::Web::Application::ResourceContract>.
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165
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166 Каждый ресурс является контейнером, тоесть позволяет получить дочерний ресурс
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167 по идентифифкатору, если таковой имеется, тоесть ресурс, у которого нет дочерних
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168 ресурсов на самом деле рассматривается как пустой контейнер.
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169
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170 С ресурсом непосредственно взаимодействует котроллер запросов
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171 C<IMPL::Web::Handler::RestController>, вызывая два метода.
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172
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173 =over
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174
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175 =item * C<FetchChildResource($childId)>
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176
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177 Данный метод возвращает дочерний ресурс, соответствующий C<$childId>.
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178 Текущая реализация использует метод C<FindChildResourceInfo> контракта текущего
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179 ресурса, после чего создает дочерний ресурс.
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180
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181 Если дочерний ресурс не найден, вызывается исключение
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182 C<IMPL::Web::NotFoundException>.
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183
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184 =item * C<InvokeHttpVerb($verb,$action)>
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185
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186 Обрабатывает запрос к ресурсу. Для этого используется контракт ресурса, в
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187 нем выбирается соответсвующий C<IMPL::Web::Application::OperationContract>.
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188 Затем найденный контракт для указанной операции используется для обработки
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189 запроса.
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190
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191 =back
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192
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193 Если объект реализует два вышеуказанных метода, он является веб-ресурсом, а
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194 детали его реализации, котнракт и прочее уже не важно, поэтому можно реализовать
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195 собственный класс ресурса, например унаследованный от
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196 C<IMPL::Web::Application::CustomResource>.
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197
230
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198 =head1 MEMBERS
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199
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200 =head2 C<[get]request>
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201
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202 Объект C<IMPL::Web::Application::Action> представляющий запрос к серверу.
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203
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204 =head2 C<[get]application>
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205
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206 Ссылка на приложение, к которому относится данный ресурс. Получается
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207 автоматически из объекта запроса.
268
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208
230
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209 =head2 C<[get]contract>
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210
248
814d755e5d12 Minor fixes
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211 Обязательное свойство для ресурса, ссылается, на контракт, соответствующий
230
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212 данному ресурсу, используется для выполнения C<HTTP> методов и получения
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213 дочерних ресурсов.
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214
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215 =head2 C<[get]id>
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216
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217 Обязательное свойство ресурса, идентифицирует его в родительском контейнере,
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218 для корневого ресурса может иметь произвольное значение.
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219
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220 =head2 C<[get]parent>
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221
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222 Ссылка на родительский ресурс, для корневого ресурса не определена.
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223
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224 =head2 C<[get]model>
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225
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226 Ссылка на объект предметной области, представляемый данным ресурсом. Данное
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227 свойство не является обязательным и может быть не задано.
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228
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229 =head2 C<[get]location>
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230
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231 Объект типа C<IMPL::Web::AutoLocator> или аналогичный описывающий адрес текущего
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232 ресурса, может быть как явно передан при создании ресурса, так и вычислен
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233 автоматически (только для ресурсов имеющих родителя). Следует заметить, что
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234 адрес ресурса не содержит параметров запроса, а только путь.
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235
359
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236 =head2 C<[get,list]role>
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237
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238 Список ролей ресурса. Роль это условный маркер, который позволяет определить
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239 функции выполняемые ресурсом, например контейнер, профиль пользователя и т.п.
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240
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241 Используется при построении цепочек навигации, а также при поиске с использованием
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242 метода C<seek>.
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243
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244 =head2 C<seek($role)>
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245
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246 Ищет ресурс в цепочке родителей (включая сам ресурс) с подходящими ролями.
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247
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248 Роли могут быть переданы в виде массива или строки, где роли разделены пробелами
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249
268
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250 =head2 C<[get]FetchChildResource($id)>
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251
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252 Возвращает дочерний ресурс, по его идентификатору.
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253
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254 Данная реализация использует контракт текущего ресурса для поиска информации о
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255 дочернем ресурсе C<< $this->contract->FindChildResourceInfo($id) >>.
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256
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257 Затем осуществляется привязка к моделе, тоесть, выполняется делегат, для
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258 получения модели дочернего ресурса, а затем осуществляется привязка к контракту,
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259 при этом в делегат, который должен вернуть контракт дочернего ресурса передаются
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260 текущий ресурc и модель дочернего ресурса.
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261
229
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262 =cut