annotate Lib/IMPL/Config.pm @ 79:2d1c3f713280

ORM concept in development
author wizard
date Mon, 05 Apr 2010 00:20:34 +0400
parents 2f31ecabe9ea
children 76515373dac0
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1 package IMPL::Config;
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2 use strict;
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3 use warnings;
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4
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5 use base qw(IMPL::Object::Accessor IMPL::Object::Serializable IMPL::Object::Autofill);
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6
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7 __PACKAGE__->PassThroughArgs;
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8
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9 use IMPL::Class::Member;
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10 use IMPL::Class::PropertyInfo;
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11 use IMPL::Exception;
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12
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13 use IMPL::Serialization;
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14 use IMPL::Serialization::XmlFormatter;
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17
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18 sub LoadXMLFile {
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19 my ($self,$file) = @_;
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20
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21 my $class = ref $self || $self;
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22
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23 my $serializer = new IMPL::Serializer(
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24 Formatter => new IMPL::Serialization::XmlFormatter(
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25 IdentOutput => 1,
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26 SkipWhitespace => 1
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27 )
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28 );
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29
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30 open my $hFile,'<',$file or die new IMPL::Exception("Failed to open file",$file,$!);
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31
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32 my $obj;
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33 eval {
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34 $obj = $serializer->Deserialize($hFile);
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35 };
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36
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37 if ($@) {
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38 my $e=$@;
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39 die new IMPL::Exception("Can't load the configuration file",$file,$e);
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40 }
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41 return $obj;
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42 }
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43
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44 sub SaveXMLFile {
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45 my ($this,$file) = @_;
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46
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47 my $serializer = new IMPL::Serializer(
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48 Formatter => new IMPL::Serialization::XmlFormatter(
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49 IdentOutput => 1,
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50 SkipWhitespace => 1
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51 )
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52 );
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53
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54 open my $hFile,'>',$file or die new IMPL::Exception("Failed to open file",$file,$!);
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55
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56 $serializer->Serialize($hFile, $this);
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57 }
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58
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59 sub xml {
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60 my $this = shift;
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61 my $serializer = new IMPL::Serializer(
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62 Formatter => new IMPL::Serialization::XmlFormatter(
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63 IdentOutput => 1,
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64 SkipWhitespace => 1
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65 )
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66 );
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67 my $str = '';
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68 open my $hFile,'>',\$str or die new IMPL::Exception("Failed to open stream",$!);
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69
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70 $serializer->Serialize($hFile, $this);
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71
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72 undef $hFile;
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73
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74 return $str;
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75 }
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76
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77 sub save {
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78 my ($this,$ctx) = @_;
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80 my $val;
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81
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82 $val = $this->rawGet($_) and $ctx->AddVar($_ => $val) foreach map $_->Name, $this->get_meta(
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83 'IMPL::Class::PropertyInfo',
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84 sub {
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85 $_->Access == IMPL::Class::Member::MOD_PUBLIC and
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86 $_->canGet;
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87 },
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88 1);
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89 }
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90
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91 sub spawn {
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92 goto &LoadXMLFile;
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93 }
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94
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95 sub get {
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96 my $this = shift;
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97
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98 if (@_ == 1) {
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99 my $obj = $this->SUPER::get(@_);
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100 return UNIVERSAL::isa($obj,'IMPL::Config::Activator') ? $obj->activate : $obj;
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101 } else {
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102 my @objs = $this->SUPER::get(@_);
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103 return map UNIVERSAL::isa($_,'IMPL::Config::Activator') ? $_->activate : $_, @objs ;
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104 }
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105 }
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106
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107 sub rawGet {
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108 my $this = shift;
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109 return $this->SUPER::get(@_);
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110 }
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111
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112 sub Exists {
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113 $_[0]->SUPER::get($_[1]) ? 1 : 0;
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114 }
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115
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116 1;
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117 __END__
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118
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119 =pod
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120
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121 =head1 NAME
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122
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123 C<IMPL::Config> - базовый класс для настраиваемого приложения.
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124
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125 =head1 SYNOPSIS
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126
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127 =begin code
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128
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129 # define application
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130
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131 package MyApp;
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132 use base qw(IMPL::Config);
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133
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134 use IMPL::Class::Property;
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135 use IMPL::Config::Class;
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136
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137 BEGIN {
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138 public property SimpleString => prop_all;
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139 public property DataSource => prop_all;
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140 }
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141
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142 sub CTOR {
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143 my $this = shift;
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144
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145 $this->DataSource(
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146 new IMPL::Config::Activator(
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147 factory => 'MyDataSource',
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148 parameters=>{
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149 host => 'localhost',
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150 user => 'dbuser'
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151 }
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152 )
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153 ) unless $this->Exists('DataSource');
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154 }
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155
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156 # using application object
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157
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158 my $app = spawn MyApp('default.xml');
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159
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160 $app->Run();
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161
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162 =end code
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163
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164 Ниже приведен пример файла C<default.xml> содержащего настройки приложения
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165
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166 =begin code xml
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167
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168 <app type='MyApp'>
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169 <SimpleString>The application</SimpleString>
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170 <DataSource type='IMPL::Config::Activator'>
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171 <factory>MyDataSourceClass</factory>
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172 <parameters type='HASH'>
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173 <host>localhost</host>
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174 <user>dbuser</user>
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175 </parameters>
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176 </DataSource>
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177 </app>
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178
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179 =end code xml
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180
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181 =head1 DESCRIPTION
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182
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183 C<[Serializable]>
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184
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185 C<[Autofill]>
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186
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187 C<use base IMPL::Object::Accessor>
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188
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189 Базовый класс для приложений. Использует подход, что приложение
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190 является объектом, состояние которого предтавляет собой конфигурацию,
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191 а методы - логику.
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192
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193 Данный класс реализует функционал десериализации (и сериализации) экземпляра
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194 приложения из XML документа. Для этого используется механизм C<IMPL::Serialization>.
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195 При этом используются опции C<IMPL::Serialization::XmlFormatter> C<IdentOutput> и
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196 C<SkipWhitespace> для записи документа в легко читаемом виде.
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197
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198 Поскольку в результате восстановления приложения восстанавливаются все элементы
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199 из файла конфигурации, то это может потребовать значительных ресурсов для
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200 создания частей, которые могут никогда не понадобиться. Например, не требуется инициализация
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201 источника данных для передачи пользователю статических данных, сохраненных на диске.
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202
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203 Для решения этой проблемы используются специальные объекты C<IMPL::Config::Activator>.
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204
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205 Если у приложения описано свойство, в котором хранится C<IMPL::Config::Activator>, то
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206 при первом обращении к такому свойству, будет создан объект вызовом метода
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207 C<< IMPL::Config::Activator->activate() >> и возвращен как значение этого свойства.
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208 Таким образом реализуется прозрачная отложенная активация объектов, что позволяет
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209 экономить ресурсы.
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210
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211 =head1 MEMBERS
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212
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213 =over
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214
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215 =item C<[static] LoadXMLFile($fileName) >
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216
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217 Создает из XML файла C<$fileName> экземпляр приложения
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218
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219 =item C<SaveXMLFile($fileName)>
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220
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221 Сохраняет приложение в файл C<$fileName>
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222
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223 =item C<[get] xml >
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224
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225 Сохраняет конфигурацию приложения в XML строку.
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226
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227 =item C<[static,operator] spawn($file)>
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228
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229 Синоним для C<LoadXMLFile>, предполагается использование как оператора.
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230
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231 =item C<rawGet($propname,...)>
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232
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233 Метод для получения значений свойств приложения. Данный метод позволяет избежать
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234 использование активации объектов через C<IMPL::Config::Activator>.
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235
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236 =back
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237
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238 =cut