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annotate Lib/IMPL/Web/Application/Resource.pm @ 229:47f77e6409f7

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heavily reworked the resource model of the web application: *some ResourcesContraact functionality moved to Resource +Added CustomResource *Corrected action handlers
author sergey
date Sat, 29 Sep 2012 02:34:47 +0400
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children 6d8092d8ce1b
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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 IMPL::lang qw(:constants);
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5 use IMPL::declare {
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6 require => {
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7 Exception => 'IMPL::Exception',
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8 ArgumentException => '-IMPL::InvalidArgumentException',
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9 OperationException => '-IMPL::InvalidOperationException',
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10 NotAllowedException => 'IMPL::Web::NotAllowedException',
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11 NotFoundException => 'IMPL::Web::NotFoundException'
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12 },
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13 base => [
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14 'IMPL::Object' => undef,
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15 'IMPL::Web::Application::ResourceInterface' => undef
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16 ],
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17 props => [
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18 parent => PROP_GET | PROP_OWNERSET,
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19 model => PROP_GET | PROP_OWNERSET,
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20 id => PROP_GET | PROP_OWNERSET,
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21 contract => PROP_GET | PROP_OWNERSET,
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22 location => PROP_GET | PROP_OWNERSET
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23 ]
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24 };
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25
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26 sub CTOR {
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27 my ( $this, %args ) = @_;
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28
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29 die ArgumentException->new( id => 'A resource identifier is required' )
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30 unless $args{id};
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31 die ArgumentException->new( contract => 'A contract is required' )
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32 unless $args{id};
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33
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34 $this->parent( $args{parent} );
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35 $this->model( $args{model} );
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36 $this->id( $args{id} );
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37 $this->contract( $args{contract} );
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38
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39 # если расположение явно не указано, что обычно делается для корневого
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40 # ресурса, то оно вычисляется автоматически, либо остается не заданным
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41 $this->location( $args{location}
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42 || eval { $this->parent->location->Child( $this->id ) } );
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43 )
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44
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45 }
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46
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47 sub InvokeHttpVerb {
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48 my ( $this, $verb, $action ) = @_;
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49
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50 my $verb = $this->contract->verbs->{ lc($verb) };
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51
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52 die NotAllowedException->new(
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53 allow => join( ',' map( uc, keys %{ $this->contract->verbs } ) ) )
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54 unless $verb;
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55
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56 return $verb->Invoke( $this, $action );
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57 }
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58
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59 # это реализация по умолчанию, базируется информации о ресурсах, содержащийся
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60 # в контракте.
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61 sub FetchChildResource {
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62 my ( $this, $childId ) = @_;
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63
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64 my $info = $this->contract->FindChildResourceInfo($childId);
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65
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66 die NotFoundException->new() unless $info;
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67
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68 my $binding = $this->{binding};
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69 my $contract = $this->{contract}
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70 or die OperationException->new("Can't fetch a contract for the resource", $childId);
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71
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72 my %args = (
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73 parent => $this,
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74 id => $childId
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75 );
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76
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77 $args{model} = _InvokeDelegate($binding,$this);
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78
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79 return $contract->CreateResource(%args);
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80 }
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81
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82 sub _InvokeDelegate {
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83 my $delegate = shift;
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84
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85 return $delegete->(@_) if ref $delegate eq 'CODE';
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86 return $delegate->Invoke(@_) if eval { $delegate->can('Invoke')};
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87 }
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88
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89 1;
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90
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91 __END__
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92
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93 =pod
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94
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95 =head1 NAME
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96
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97 C<IMPL::Web::Application::Resource> - Web-ресурс.
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98
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99 =head1 SYNOPSIS
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100
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101 Класс для внутреннего использования. Объединяет в себе контракт и модель данных.
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102 Основная задача - обработать поступающий от контроллера запрос на вызов C<HTTP>
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103 метода.
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104
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105 Экземпляры данного класса передаются в качестве параметров делегатам
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106 осуществляющим привязку к модели в C<IMPL::Web::Application::ResourceContract>
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107 и C<IMPL::Web::Application::OperationContract>.
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108
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109 =head1 DESCRIPTION
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110
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111 Весь функционал ресурса, поддерживаемые им C<HTTP> методы определяются
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112 контрактом. Однако можно реализовывать ресурсы, которые не имеют контракта
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113 или он отличается от того, что предоставляется стандартно
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114 C<IMPL::Web::Application::ResourceContract>.
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115
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116 Каждый ресурс является контейнером, тоесть позволяет получить дочерний ресурс
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117 по идентифифкатору, если таковой имеется, тоесть ресурс, у которого нет дочерних
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118 ресурсов на самом деле рассматривается как пустой контейнер.
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119
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120 С ресурсом непосредственно взаимодействует котроллер запросов
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121 C<IMPL::Web::Handler::RestController>, вызывая два метода.
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122
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123 =over
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124
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125 =item * C<FetchChildResource($childId)>
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126
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127 Данный метод возвращает дочерний ресурс, соответствующий C<$childId>.
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128 Текущая реализация использует метод C<FindChildResourceInfo> контракта текущего
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129 ресурса, после чего создает дочерний ресурс.
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130
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131 Если дочерний ресурс не найден, вызывается исключение
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132 C<IMPL::Web::NotFoundException>.
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133
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134 =item * C<InvokeHttpVerb($verb,$action)>
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135
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136 Обрабатывает запрос к ресурсу. Для этого используется контракт ресурса, в
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137 нем выбирается соответсвующий C<IMPL::Web::Application::OperationContract>.
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138 Затем найденный контракт для указанной операции используется для обработки
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139 запроса.
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140
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141 =back
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142
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143 Если объект реализует два вышеуказанных метода, он является веб-ресурсом, а
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144 детали его реализации, котнракт и прочее уже не важно, поэтому можно реализовать
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145 собственный класс ресурса, например унаследованный от
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146 C<IMPL::Web::Application::CustomResource>.
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147
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148 =cut