annotate Lib/IMPL/Web/Application/ResourceContract.pm @ 334:71221d79e6b4

removing web resources contracts
author cin
date Thu, 13 Jun 2013 02:24:57 +0400
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1 package IMPL::Web::Application::ResourceContract;
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2 use strict;
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3
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4 use IMPL::lang;
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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 Exception => 'IMPL::Exception',
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9 ArgumentException => '-IMPL::ArgumentException',
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10 KeyNotFoundException => '-IMPL::KeyNotFoundException',
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11 ResourceClass => 'IMPL::Web::Application::CustomResource',
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12 CustomContract => 'IMPL::Web::Application::CustomResourceContract',
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13 Factory => 'IMPL::Object::Factory'
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14 },
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15 base => [ 'IMPL::Object' => undef ],
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16 props => [
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17 resourceFactory => PROP_ALL,
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18 verbs => PROP_ALL,
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19 _namedResources => PROP_ALL,
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20 _regexpResources => PROP_ALL | PROP_LIST,
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21 ]
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22 };
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23
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24 sub CTOR {
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25 my $this = shift;
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26 my %args = @_;
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27
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28 my $factory = delete $args{resourceFactory} || ResourceClass;
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29 my $resources = delete $args{resources} || [];
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30 my $verbs = delete $args{verbs} || {};
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31
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32 die ArgumentException->new(
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33 resources => 'resources parameter must be a reference to an array' )
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34 unless ref $resources eq 'ARRAY';
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35
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36 die ArgumentException->new(
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37 opearations => 'operations parameter must be a reference to a hash' )
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38 unless ref $verbs eq 'HASH';
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39
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40 $this->verbs(
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41 { map { lc($_), $verbs->{$_} } keys %$verbs } );
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42
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43 my %nameMap;
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44
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45 foreach my $res (@$resources) {
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46 if (ref $res->{contract} eq 'HASH') {
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47 # custom contract will add OPTIONS verb if needed
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48 $res->{contract} = CustomContract->new(%{$res->{contract}});
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49 }
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50
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51 next unless $res->{contract};
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52
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53 if ( my $name = $res->{name} ) {
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54 $nameMap{$name} = $res;
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55 }
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56 if ( $res->{match} ) {
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57 $this->_regexpResources->Append($res);
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58 }
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59 }
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60
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61 $this->_namedResources( \%nameMap );
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62
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63 $this->resourceFactory( %args ? Factory->new($factory,\%args) : $factory );
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64 }
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65
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66 sub AddChildResourceContract {
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67 my ($this,$res) = @_;
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68
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69 die ArgumentException->new(res => "A valid child resource definition")
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70 unless ref $res eq 'HASH';
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71
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72 $this->_namedResources->{$res->{name}} = $res if $res->{name};
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73 $this->_regexpResources->Append($res) if $res->{match};
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74
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75 return;
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76 }
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77
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78 sub CreateResource {
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79 my $this = shift;
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80 my %args = @_;
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81
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82 return $this->resourceFactory->new( %args, contract => $this );
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83 }
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84
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85 sub FindChildResourceInfo {
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86 my ( $this, $name ) = @_;
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87
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88 if ( my $info = $this->_namedResources->{$name} ) {
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89 return $info, [$name];
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90 }
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91 else {
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92 foreach my $info ( $this->_regexpResources ) {
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93 my $rx = $info->{match};
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94 if(my @childId = $name =~ m/$rx/) {
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95 return $info, \@childId;
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96 }
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97 }
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98 }
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99
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100 return;
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101 }
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102
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103 1;
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104
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105 __END__
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106
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107 =pod
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108
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109 =head1 NAME
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110
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111 C<IMPL::Web::Application::ResourceContract> - описание ресурса
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112
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113 =head1 SYNIOSIS
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114
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115 =begin code
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116
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117 use IMPL::require {
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118 ResourceContract => 'IMPL::Web::Application::ResourceContract',
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119 OperationContract => 'IMPL::Web::Application::OperationContract'
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120 };
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121
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122 my $contract = ResourceContract->new(
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123 verbs => {
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124 get => sub {
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125 my ($resource,$action) = @_;
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126 return "Hello!";
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127 },
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128 post => OperationContract->new(
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129 binding => sub {
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130 my ($resource,$action) = @_;
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131 my $data = My::App::ModelBinder->new($resource->ds)->Bind($action);
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132 return IMPL::Web::HttpResponse->Redirect(
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133 location => $resource->location->Child($result->id)
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134 )
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135 }
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136 ),
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137 },
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138 resources => [
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139 {
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140 name => 'info',
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141 binding => sub {
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142 return $_[0]->model->info;
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143 },
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144 contract => {
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145 verbs => {
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146 get => sub {
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147 my ($resource,$action) = @_;
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148 return $resource->model;
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149 }
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150
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151 }
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152 }
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153 }
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154 ]
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155 )
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156
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157 my $obj = My::App::Data->fetch('something');
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158
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159 my $resource = $contract->CreateResource(
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160 request => $currentRequest,
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161 model => $obj,
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162 parent => $prentResource,
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163 id => 'item-something'
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164 );
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165
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166 my $child = $contract->FetchChildResource('info');
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167
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168 =end code
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169
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170 =head1 DESCRIPTION
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171
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172 Контракт описывает структуру Веб-ресурса и отображение операций над ним в методы
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173 предметной области. Контракты используются инфраструктурой и пользователь
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174 не использует их напрямую, до тех пор пока не требуется изменить стандартный
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175 функционал.
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176
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177
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178 Ресурс представляе собой набор контрактов операций, соответствующих методам
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179 C<HTTP> которые доступны у данного ресурса. Кроме операций ресурс состоит из
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180 дочерних ресурсов, которые могут соответствовать регулярным выражениям, либо
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181 иметь фиксированные имена.
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182
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183 Каждая операция над ресурсом C<IMPL::Web::Application::OperationContract>
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184 описывается преобразованием параметров, привязкой к предметной области,
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185 дополнительным обработчиком результата выполнения привязки, либо обработчиком
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186 исключения, если привязку не удалось выполнить.
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187
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188 Основное назначение контракта - создавать объекты ресурсов, над которыми
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189 контроллер запросов C<HTTP> сможет выполнить операцию. Контракт может создавать
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190 дочерние ресурсы, на основе указанного родительского ресурса и идетификатора
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191 нового ресурса. При этом будет найден подходящий контракт для дочернего ресурса
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192 и с его помощью создан дочерний ресурс.
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193
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194 =head2 Динамический контракт
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195
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196 Основная функция контракта - превращать данные модели предметной области в
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197 данные ресурсной модели, тоесть в ресурсы, для чего каждый контракт обязан
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198 реализовывать метод C<CreateResource(%args)>.
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199
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200 Результатом выполнения этого метода должен быть Web-ресурс, см.
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201 C<IMPL::Web::Application::Resource>. Другими словами не существует жесткого
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202 требования к реализации самого контракта, как и того, что созданный ресурс
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203 должен ссылаться именно на этот контракт (да и вообще ссылаться на контракт).
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204
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205 Таким образом можно реализовать контракт, который выполняет роль посредника,
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206 ниже приведен пример, который выбирает нужный контракт на основе типа модели
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207 переданной для создания ресурса.
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208
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209 =begin code
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210
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211 package My::Web::Application::ContractMapper;
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212 use strict;
230
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213 use IMPL::Const qw(:prop);
229
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214 use IMPL::declare {
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215 require => {
268
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216 ForbiddenException => 'IMPL::Web::ForbiddenException'
229
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217 },
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218 base => [
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219 'IMPL::Object' => undef,
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220 'IMPL::Object::Autofill' => '@_'
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221 ],
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222 props => [
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223 map => PROP_GET | PROP_OWNERSET
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224 ]
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225 }
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226
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227 sub CreateResource {
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228 my ($this,%args) = @_;
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229
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230 my $type = ref $args{model} || '_default';
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231
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232 my $contract = $this->map->{$type};
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233
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234 die ForbiddenException->new()
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235 unless $contract;
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236
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237 return $contract->CreateResource(%args);
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238 }
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239
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240 =end code
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241
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242 =head1 MEMBERS
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243
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244 =head2 C<CTOR(%args)>
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245
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246 =over
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247
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248 =item * C<resourceFactory>
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249
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250 Фабрика объектов C<IMPL::Object::Factory> которая будет использоваться при
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251 создании новых ресурсов. По-умолчанию C<IMPL::Web::Application::Resource>.
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252
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253 =item * C<operations>
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254
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255 Хеш с доступными действиями над C<HTTP> ресурсом, ключом является имя ресурса,
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256 значением C<IMPL::Web::Application::OperationContract>.
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257
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258 =item * C<resources>
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259
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260 Ссылка на массив хешей, каждый хеш описывает правила, как получить дочерний
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261 ресурс и связать его с контрактом. Ниже преведено описание элементов хеша.
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262
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263 =over
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264
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265 =item * C<name>
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266
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267 Имя дочернегно ресурса.
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268
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269 =item * C<match>
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270
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271 Регулярное выражение, которому должно удовлетворять имя дочернего ресурса.
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272
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273 =item * C<bind>
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274
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275 Делегат, получающий модель для дочернего ресурса. Первым параметром ему
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276 передается родительский объект, далее передаются граппы из регулярного
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277 выражения, если это ресурс с именем удовлетворяющим регулярному выражению из
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278 элемента C<match>, либо имя ресурса, если это ресурс с именем, указанным в
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279 элементе C<name>.
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280
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281 =item * C<contract>
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282
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283 Ссылка на C<IMPL::Web::Application::ResourceContract> для дочернего ресурса.
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284 У данного контракта используется только метод C<CreateContract>.
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285
268
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286 Для реализации отложенной загрузки контракта (чтобы снизить ресурсоемкость
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287 запуска приложения) вместо ссылки на контракт может быть либо ссылка на
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288 процедуру, либо объект имеющий метод C<Invoke>.
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289
229
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290 =back
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291
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292 По крайней мере C<name> или C<match> должны присутсвовать.
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293
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294 =back
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295
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296 =head2 C<CreateResource(%args)>
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297
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298 Создает ресурс, параметры C<%args> будут переданы напрямую констркутору
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299 ресурса, для создания ресурса используется фабрика C<resourceFactory>.
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300 При создании, конгструктору ресурса, будет передана ссылка на текущй контракт.
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301
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302 По-сути никакого дополнительного функционала данный метод не несет.
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303
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304 =head2 C<FindChildResourceInfo($childId)>
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305
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306 Используется для поиска информации о дочернем ресурсе, возвращает список из двух
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307 элементов. C<($info,$childIdParts)>
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308
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309 =over
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310
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311 =item * C<$info>
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312
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313 Информация о контракте дочернего ресурса, как правило это ссылка на хеш, похожий
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314 по формату на
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315
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316 =back
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317
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318 =head2 C<[get]verbs>
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319
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320 Хеш с доступными действиями над C<HTTP> ресурсом, все имена операций приведены
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321 к нижнему регистру.
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322
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323 =begin code
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324
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325 my $result = $contract->verbs->{get}->Invoke($resource,$action);
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326
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327 =end code
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328
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329 =cut