annotate Lib/IMPL/Web/Application/Action.pm @ 110:c13a215508ca

Refactoring, ControllerUnit
author wizard
date Mon, 17 May 2010 17:42:27 +0400
parents 9f5795a10939
children b56ebc31bf18
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1 package IMPL::Web::Application::Action;
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2 use strict;
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3
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4 use base qw(IMPL::Object IMPL::Object::Autofill);
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5
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6 __PACKAGE__->PassThroughArgs;
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7
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8 use IMPL::Class::Property;
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9
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10 BEGIN {
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11 public property application => prop_get | owner_set;
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12 public property query => prop_get | owner_set;
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13 public property response => prop_get | owner_set;
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14 public property responseFactory => prop_get | owner_set;
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15
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16 private property _entryPoint => prop_all;
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17 }
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18
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19 sub CTOR {
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20 my ($this) = @_;
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21
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22 $this->responseFactory('IMPL::Web::Application::Response') unless $this->responseFactory;
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23 $this->response( $this->responseFactory->new(query => $this->query) );
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24 }
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25
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26 sub Invoke {
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27 my ($this) = @_;
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28
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29 if ($this->_entryPoint) {
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30 $this->_entryPoint->();
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31 } else {
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32 die new IMPL::InvalidOperationException("At least one handler is required");
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33 }
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34 }
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35
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36 sub ReinitResponse {
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37 my ($this) = @_;
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38
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39 die new IMPL::InvalidOperationException("Response already sent") if $this->response->isHeaderPrinted;
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40
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41 $this->response->Discard;
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42 $this->response($this->responseFactory->new(query => $this->query));
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43 }
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44
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45 sub ChainHandler {
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46 my ($this,$handler) = @_;
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47
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48 my $delegateNext = $this->_entryPoint();
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49
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50 if (ref $handler eq 'CODE') {
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51 $this->_entryPoint( sub {
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52 $handler->($this,$delegateNext);
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53 } );
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54 } elsif (ref $handler and UNIVERSAL::isa($handler,'IMPL::Web::QueryHandler')) {
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55 $this->_entryPoint( sub {
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56 $handler->Invoke($this,$delegateNext);
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57 } );
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58 } elsif ($handler and not ref $handler) {
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59
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60 if (my $method = $this->can($handler) ) {
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61 $this->_entryPoint( sub {
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62 $method->($this,$delegateNext);
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63 } );
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64 } else {
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65 {
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66 no strict 'refs';
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67 eval "require $handler; 1;" or die new IMPL::InvalidArgumentException("An invalid handler supplied",$handler,"Failed to load module") unless keys %{"${handler}::"};
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68 }
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69
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70 if (UNIVERSAL::isa($handler,'IMPL::Web::QueryHandler')) {
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71 $this->_entryPoint( sub {
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72 $handler->Invoke($this,$delegateNext);
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73 } );
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74 } else {
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75 die new IMPL::InvalidArgumentException("An invalid handler supplied",$handler);
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76 }
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77 }
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78 } else {
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79 die new IMPL::InvalidArgumentException("An invalid handler supplied",$handler);
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80 }
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81
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82 }
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83
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84 1;
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85
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86 __END__
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87
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88 =pod
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89
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90 =head1 NAME
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91
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92 C<IMPL::Web::Application::Action> - Обертка вокруг C<CGI> запроса.
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93
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94 =head1 DESCRIPTION
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95
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96 C<[Infrastructure]>
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97
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98 Определяет порядок выполнения запроса. Запрос выполняется последовательным вызовом
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99 цепочки обработчиков, при этом обработчики сами вызывают следующие.
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100 Обработчики выполняются в порядке, обратном их добавлению.
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101
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102 Типичная цепочка может быть такой, в порядке добавления
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103
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104 =begin code
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105
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106 IMPL::Web::QueryHandler::SecCallToMethod
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107 IMPL::Web::QueryHandler::AuthenticateCookie
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108 IMPL::Web::QueryHandler::PageFormat
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109
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110 =end code
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111
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112 что приведет к следующей последовательности
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113
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114 =begin code
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115
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116 # the application creates a new Action object
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117
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118 my $action = $application->actionFactory->new(
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119 action => $application, # the application passes self
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120 query => $query # current CGI query
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121 );
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122
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123 # forms query handlers stack
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124
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125 $action->ChainHandler($_) foreach qw (
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126 IMPL::Web::QueryHandler::SecCallToMethod
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127 IMPL::Web::QueryHandler::AuthenticateCookie
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128 IMPL::Web::QueryHandler::PageFormat
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129 );
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130
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131 # and finally invokes the action
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132
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133 $action->Invoke() {
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134
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135 # some internals
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136
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137 IMPL::Web::QueryHandler::PageFormat->Invoke($action,$nextHandlerIsAuthHandler) {
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138
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139 #some internals
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140
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141 my $result = $nextHandlerIsAuthHandler() {
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142
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143 # some internals
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144
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145 IMPL::Web::QueryHandler::AuthenticateCookie->Invoke($action,$nextHandlerIsSecCall) {
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146
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147 # some internals
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148 # do auth and generate security $context
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149
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150 # impersonate $context and call the next handler
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151 return $context->Impersonate($nextHandlerIsSecCall) {
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152
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153 # some internals
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154
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155 IMPL::Web::QueryHandler::SecCallToMethod->Invoke($action,undef) {
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156
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157 # next handler isn't present as it is the last hanler
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158
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159 # some internals
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160 # calculate the $method and the $target from CGI request
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161
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162 IMPL::Security->AccessCheck($target,$method);
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163 return $target->$method();
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164
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165 }
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166
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167 }
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168
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169 }
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170 }
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171
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172 # some intenals
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173 # formatted output to $action->response->streamBody
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174 }
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175 }
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176
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177 =end code
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178
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179 или как альтернатива может быть еще
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180
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181 =begin code
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182
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183 IMPL::Web::QueryHandler::SecCallToMethod
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184 IMPL::Web::QueryHandler::AuthenticateCookie
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185 IMPL::Web::QueryHandler::Filter->new( target => IMPL::Transform::ObjectToJSON->new() , method => 'Transform')
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186 IMLP::Web::QueryHandler::JSONFormat
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187
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188
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189 =end code
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190
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191 В данной цепочке также происходит вызов метода, но его результат потом преобразуется
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192 в простые структуры и передается JSON преобразователю. Таким образом модулю логики
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193 не требуется знать о выходном формате, всю работу проделают дополнительные фильтры.
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194
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195 =head1 MEMBERS
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196
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197 =head2 PROPERTIES
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198
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199 =over
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200
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201 =item C< [get] application>
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202
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203 Экземпляр приложения создавшего текущий объект
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204
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205 =item C< [get] query >
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206
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207 Экземпляр C<CGI> запроса
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208
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209 =item C< [get] response >
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210
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211 Ответ на C<CGI> заспрос C<IMPL::Web::Application::Response>
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212
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213 =item C< [get] responseFactory >
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214
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215 Фабрика ответов на запрос, используется для создания нового ответа
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216 либо при конструировании текущего объекта C<IMPL::Web::Application::Action>,
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217 либо при вызове метода C<ReinitResponse> у текущего объекта.
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218
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219 По умолчанию имеет значение C<IMPL::Web::Application::Response>
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220
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221 =back
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222
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223 =head2 METHODS
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224
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225 =over
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226
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227 =item C< ReinitResponse() >
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228
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229 Отмена старого ответа C<response> и создание вместо него нового.
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230
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231 Данная операция обычно проводится при обработке ошибок, когда
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232 уже сформированный ответ требуется отменить. Следует заметить,
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233 что эта операция не возможна, если ответ частично или полностью
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234 отправлен клиенту. Тогда возникает исключение C<IMPL::InvalidOperationException>.
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235
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236 =item C< ChainHandler($handler) >
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237
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238 Добавляет новый обработчик в цепочку. Выполнение цепочки начинается с конца,
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239 тоесть последний добавленный будет выполнен первым.
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240
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241 =back
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242
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243 =head1 HANDLERS
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244
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245 =head2 subroutines
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246
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247 =over
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248
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249 =item CODE ref
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250
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251 Ссылка на процедуру может являться обработчиком, при этом функция будет вызвана с
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252 двумя параметрами: ссылкой на action объект, и точкой входа следующего обработчика.
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253
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254 =item Method Name
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255
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256 Имя метода, передается в виде строки. У текущего объекта action ищется метод с
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257 указанным именем, после чего используется ссылка на этот метод для вызова с двумя
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258 параметрами: ссылкой на action объект, и точкой входа следующего обработчика.
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259
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260 Получается вызов идентичный следующему C<< $action->MethodName($nextHandler) >>;
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261
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262 =back
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263
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264 =head2 C< IMPL::Web::QueryHandler >
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265
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266 Любой объект наследованный от C< IMPL::Web::QueryHandler > может быть
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267 использован в качестве обработчика запроса
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268
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269 =cut