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annotate Lib/IMPL/Web/Handler/RestController.pm @ 268:4abda21186cd

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*refactoring IMPL::Web: added 'application' property to resources
author cin
date Mon, 21 Jan 2013 02:08:17 +0400
parents 32aceba4ee6d
children 04a093f0a5a6
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1 package IMPL::Web::Handler::RestController;
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2 use strict;
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3
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4 use IMPL::Const qw(:prop);
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5 use IMPL::declare {
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6 require => {
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7 Locator => 'IMPL::Web::AutoLocator',
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8 ResourceInterface => 'IMPL::Web::Application::ResourceInterface',
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9 Exception => 'IMPL::Exception',
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10 ArgumentExecption => '-IMPL::InvalidArgumentException',
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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::Object::Autofill' => '@_',
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16 'IMPL::Object::Serializable' => undef
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17 },
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18 props => [
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19 resourceFactory => PROP_RO,
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20 trailingSlash => PROP_RO
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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) = @_;
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26
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27 die ArgumentException->new(resourceFactory => "A web-resource is required")
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28 unless $this->resourceFactory;
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29 #unless eval { $this->resourceFacotry->isa(ResourceInterface) };
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30
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31 }
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32
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33 sub GetResourcePath {
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34 my ($this,$action) = @_;
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35
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36 my $pathInfo = $action->pathInfo;
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37 my @segments;
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38
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39 if (length $pathInfo) {
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40
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41 @segments = split(/\//, $pathInfo, $this->trailingSlash ? -1 : 0);
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42
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43 # remove first segment if it is empty
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44 shift @segments if @segments && length($segments[0]) == 0;
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45 }
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46
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47 return @segments;
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48 }
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49
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50
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51 sub Invoke {
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52 my ($this,$action) = @_;
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53
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54 my $method = $action->requestMethod;
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55
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56 my @segments = $this->GetResourcePath($action);
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57
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58 my $res = $this->resourceFactory->new(
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59 id => 'root',
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60 location => Locator->new(base => $action->application->baseUrl),
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61 application => $action->application
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62 );
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63
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64 while(@segments) {
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65 my $id = shift @segments;
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66
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67 $res = $res->FetchChildResource($id);
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68 }
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69
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70 $res = $res->InvokeHttpVerb($method,$action);
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71 }
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72
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73 1;
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74
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75 __END__
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76
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77 =pod
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78
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79 =head1 NAME
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80
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81 C<IMPL::Web::Handler::RestController> - Обрабатывает C<HTTP> запрос передавая
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82 его соответствующему ресурсу.
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83
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84 =head1 SYNOPSIS
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85
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86 Используется в конфигурации приложения как элемент цепочки обработчиков.
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87 Как правило располагается на самом верхнем уровне.
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88
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89 =begin code xml
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90
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91 <handlers type="ARRAY">
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92 <item type="IMPL::Web::Handler::RestController">
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93 <resourceFactory>My::App::Web::RootResource"</resourceFactory>
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94 </item>
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95 <item type="IMPL::Web::Handler::JSONView" />
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96 <item type="IMPL::Web::Handler::SecureCookie" />
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97 <item type="IMPL::Web::Handler::ErrorHandler" />
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98 </handlers>
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99
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100 =end code xml
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101
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102
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103 =head1 DESCRIPTION
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104
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105 Использует C<PATH_INFO> для определения нужного ресурса, затем предает
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106 найденному ресурсу управление для обработки запроса.
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107
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108 Если ресурс не найден, то возникает исключение C<IMPL::Web::NotFoundException>.
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109
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110 Для определения нужного ресурса контроллер разбивает C<PATH_INFO> на фрагменты
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111 и использует каждый фрагмент для получения дочернего ресурса начиная с корневого.
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112 Для чего используется метод
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113 C<< IMPL::Web::Application::ResourceInterface->FetchChildResource($childId) >>.
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114
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115 Дерево ресурсов сущестувет независимо от обрабатываемого запроса, однако оно
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116 может полностью или частично загружаться в начале обработки запроса и
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117 освобождаться по окончании обработки запроса. Поэтому при получении дочерних
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118 ресурсов не участвует C<HTTP> запрос, он адресуется только последнему ресурсу.
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119
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120 =begin text
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121
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122 /music/audio.mp3 -> ['music','audio.mp3']
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123
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124 =end text
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125
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126 =head1 MEMEBERS
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127
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128 =head2 C<[get]resourceFactory>
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129
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130 Фабрика для создания корневого ресурса приложения, полученный ресурс должен
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131 реализовывать интерфейс C<IMPL::Web::Application::ResourceInterface>.
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132
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133 Фабрика может сохранять ссылку на корневой ресурс и каждый раз не создавать
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134 его, а возвращать уже существующий. Это вполне оправдано, если хранение
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135 дерева ресурсов требует меньше ресурсов, чем его создание и при этом приложение
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136 остается в памяти между C<HTTP> запросами.
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137
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138 =head2 C<[get]trailingSlash>
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139
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140 Если данная переменная имеет значение C<true>, то слеш в конце пути к ресурсу
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141 будет интерпретироваться, как дочерний ресурс с пустым идентификатором.
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142
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143 =cut