annotate Lib/IMPL/Web/Application/Action.pm @ 164:eb3e9861a761

SQL traits in progress
author wizard
date Mon, 28 Mar 2011 01:36:24 +0400
parents b04e978d6d5a
children 4267a2ac3d46
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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",$handler);
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80 }
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81
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82 }
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83
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84 sub cookie {
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85 my ($this,$name,$rx) = @_;
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86
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87 $this->_launder(scalar( $this->query->cookie($name) ), $rx );
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88 }
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89
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90 sub param {
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91 my ($this,$name,$rx) = @_;
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92
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93 $this->_launder(scalar( $this->query->param($name) ), $rx );
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94 }
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95
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96 sub _launder {
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97 my ($this,$value,$rx) = @_;
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98
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99 if ( $value ) {
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100 if ($rx) {
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101 if ( my @result = ($value =~ m/$rx/) ) {
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102 return @result > 1 ? \@result : $result[0];
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103 } else {
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104 return undef;
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105 }
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106 } else {
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107 return $value;
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108 }
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109 } else {
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110 return undef;
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111 }
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112 }
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113
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114 1;
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115
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116 __END__
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117
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118 =pod
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119
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120 =head1 NAME
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121
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122 C<IMPL::Web::Application::Action> - Обертка вокруг C<CGI> запроса.
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123
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124 =head1 DESCRIPTION
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125
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126 C<[Infrastructure]>
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127
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128 Определяет порядок выполнения запроса. Запрос выполняется последовательным вызовом
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129 цепочки обработчиков, при этом обработчики сами вызывают следующие.
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130 Обработчики выполняются в порядке, обратном их добавлению.
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131
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132 Типичная цепочка может быть такой, в порядке добавления
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133
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134 =begin code
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135
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136 IMPL::Web::QueryHandler::SecCallToMethod
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137 IMPL::Web::QueryHandler::AuthenticateCookie
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138 IMPL::Web::QueryHandler::PageFormat
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139
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140 =end code
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141
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142 что приведет к следующей последовательности
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143
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144 =begin code
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145
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146 # the application creates a new Action object
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147
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148 my $action = $application->actionFactory->new(
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149 action => $application, # the application passes self
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150 query => $query # current CGI query
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151 );
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152
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153 # forms query handlers stack
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154
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155 $action->ChainHandler($_) foreach qw (
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156 IMPL::Web::QueryHandler::SecCallToMethod
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157 IMPL::Web::QueryHandler::AuthenticateCookie
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158 IMPL::Web::QueryHandler::PageFormat
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159 );
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160
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161 # and finally invokes the action
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162
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163 $action->Invoke() {
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164
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165 # some internals
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166
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167 IMPL::Web::QueryHandler::PageFormat->Invoke($action,$nextHandlerIsAuthHandler) {
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168
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169 #some internals
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170
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171 my $result = $nextHandlerIsAuthHandler() {
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172
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173 # some internals
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174
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175 IMPL::Web::QueryHandler::AuthenticateCookie->Invoke($action,$nextHandlerIsSecCall) {
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176
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177 # some internals
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178 # do auth and generate security $context
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179
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180 # impersonate $context and call the next handler
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181 return $context->Impersonate($nextHandlerIsSecCall) {
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182
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183 # some internals
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184
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185 IMPL::Web::QueryHandler::SecCallToMethod->Invoke($action,undef) {
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186
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187 # next handler isn't present as it is the last hanler
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188
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189 # some internals
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190 # calculate the $method and the $target from CGI request
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191
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192 IMPL::Security->AccessCheck($target,$method);
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193 return $target->$method();
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194
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195 }
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196
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197 }
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198
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199 }
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200 }
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201
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202 # some intenals
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203 # formatted output to $action->response->streamBody
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204 }
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205 }
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206
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207 =end code
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208
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209 или как альтернатива может быть еще
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210
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211 =begin code
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212
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213 IMPL::Web::QueryHandler::SecCallToMethod
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214 IMPL::Web::QueryHandler::AuthenticateCookie
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215 IMPL::Web::QueryHandler::Filter->new( target => IMPL::Transform::ObjectToJSON->new() , method => 'Transform')
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216 IMLP::Web::QueryHandler::JSONFormat
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217
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218
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219 =end code
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220
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221 В данной цепочке также происходит вызов метода, но его результат потом преобразуется
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222 в простые структуры и передается JSON преобразователю. Таким образом модулю логики
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223 не требуется знать о выходном формате, всю работу проделают дополнительные фильтры.
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224
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225 =head1 MEMBERS
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226
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227 =head2 PROPERTIES
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228
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229 =over
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230
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231 =item C< [get] application>
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232
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233 Экземпляр приложения создавшего текущий объект
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234
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235 =item C< [get] query >
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236
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237 Экземпляр C<CGI> запроса
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238
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239 =item C< [get] response >
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240
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241 Ответ на C<CGI> заспрос C<IMPL::Web::Application::Response>
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242
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243 =item C< [get] responseFactory >
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244
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245 Фабрика ответов на запрос, используется для создания нового ответа
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246 либо при конструировании текущего объекта C<IMPL::Web::Application::Action>,
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247 либо при вызове метода C<ReinitResponse> у текущего объекта.
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248
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249 По умолчанию имеет значение C<IMPL::Web::Application::Response>
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250
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251 =back
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252
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253 =head2 METHODS
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254
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255 =over
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256
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257 =item C< ReinitResponse() >
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258
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259 Отмена старого ответа C<response> и создание вместо него нового.
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260
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261 Данная операция обычно проводится при обработке ошибок, когда
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262 уже сформированный ответ требуется отменить. Следует заметить,
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263 что эта операция не возможна, если ответ частично или полностью
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264 отправлен клиенту. Тогда возникает исключение C<IMPL::InvalidOperationException>.
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265
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266 =item C< ChainHandler($handler) >
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267
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268 Добавляет новый обработчик в цепочку. Выполнение цепочки начинается с конца,
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269 тоесть последний добавленный будет выполнен первым.
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270
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271 =back
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272
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273 =head1 HANDLERS
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274
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275 =head2 subroutines
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276
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277 =over
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278
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279 =item CODE ref
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280
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281 Ссылка на процедуру может являться обработчиком, при этом функция будет вызвана с
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282 двумя параметрами: ссылкой на action объект, и точкой входа следующего обработчика.
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283
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284 =item Method Name
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285
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286 Имя метода, передается в виде строки. У текущего объекта action ищется метод с
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287 указанным именем, после чего используется ссылка на этот метод для вызова с двумя
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288 параметрами: ссылкой на action объект, и точкой входа следующего обработчика.
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289
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290 Получается вызов идентичный следующему C<< $action->MethodName($nextHandler) >>;
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291
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292 =back
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293
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294 =head2 C< IMPL::Web::QueryHandler >
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295
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296 Любой объект наследованный от C< IMPL::Web::QueryHandler > может быть
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297 использован в качестве обработчика запроса
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298
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299 =cut