Mercurial > pub > Impl
annotate Lib/IMPL/Config.pm @ 100:df6b4f054957
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| author | wizard |
|---|---|
| date | Thu, 06 May 2010 00:54:17 +0400 |
| parents | 2f31ecabe9ea |
| children | 76515373dac0 |
| rev | line source |
|---|---|
| 49 | 1 package IMPL::Config; |
| 2 use strict; | |
| 3 use warnings; | |
| 4 | |
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5 use base qw(IMPL::Object::Accessor IMPL::Object::Serializable IMPL::Object::Autofill); |
| 49 | 6 |
| 7 __PACKAGE__->PassThroughArgs; | |
| 8 | |
| 9 use IMPL::Class::Member; | |
| 10 use IMPL::Class::PropertyInfo; | |
| 11 use IMPL::Exception; | |
| 12 | |
| 13 use IMPL::Serialization; | |
| 14 use IMPL::Serialization::XmlFormatter; | |
| 15 | |
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16 |
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17 |
| 49 | 18 sub LoadXMLFile { |
| 19 my ($self,$file) = @_; | |
| 20 | |
| 21 my $class = ref $self || $self; | |
| 22 | |
| 23 my $serializer = new IMPL::Serializer( | |
| 24 Formatter => new IMPL::Serialization::XmlFormatter( | |
| 25 IdentOutput => 1, | |
| 26 SkipWhitespace => 1 | |
| 27 ) | |
| 28 ); | |
| 29 | |
| 30 open my $hFile,'<',$file or die new IMPL::Exception("Failed to open file",$file,$!); | |
| 31 | |
| 32 my $obj; | |
| 33 eval { | |
| 34 $obj = $serializer->Deserialize($hFile); | |
| 35 }; | |
| 36 | |
| 37 if ($@) { | |
| 38 my $e=$@; | |
| 39 die new IMPL::Exception("Can't load the configuration file",$file,$e); | |
| 40 } | |
| 41 return $obj; | |
| 42 } | |
| 43 | |
| 44 sub SaveXMLFile { | |
| 45 my ($this,$file) = @_; | |
| 46 | |
| 47 my $serializer = new IMPL::Serializer( | |
| 48 Formatter => new IMPL::Serialization::XmlFormatter( | |
| 49 IdentOutput => 1, | |
| 50 SkipWhitespace => 1 | |
| 51 ) | |
| 52 ); | |
| 53 | |
| 54 open my $hFile,'>',$file or die new IMPL::Exception("Failed to open file",$file,$!); | |
| 55 | |
| 56 $serializer->Serialize($hFile, $this); | |
| 57 } | |
| 58 | |
| 59 sub xml { | |
| 60 my $this = shift; | |
| 61 my $serializer = new IMPL::Serializer( | |
| 62 Formatter => new IMPL::Serialization::XmlFormatter( | |
| 63 IdentOutput => 1, | |
| 64 SkipWhitespace => 1 | |
| 65 ) | |
| 66 ); | |
| 67 my $str = ''; | |
| 68 open my $hFile,'>',\$str or die new IMPL::Exception("Failed to open stream",$!); | |
| 69 | |
| 70 $serializer->Serialize($hFile, $this); | |
| 71 | |
| 72 undef $hFile; | |
| 73 | |
| 74 return $str; | |
| 75 } | |
| 76 | |
| 77 sub save { | |
| 78 my ($this,$ctx) = @_; | |
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79 |
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80 my $val; |
| 49 | 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); |
| 49 | 89 } |
| 90 | |
| 58 | 91 sub spawn { |
| 92 goto &LoadXMLFile; | |
| 93 } | |
| 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 |
| 49 | 116 1; |
| 117 __END__ | |
| 118 | |
| 119 =pod | |
| 120 | |
| 73 | 121 =head1 NAME |
| 122 | |
| 123 C<IMPL::Config> - базовый класс для настраиваемого приложения. | |
| 124 | |
| 125 =head1 SYNOPSIS | |
| 49 | 126 |
| 73 | 127 =begin code |
| 128 | |
| 129 # define application | |
| 130 | |
| 131 package MyApp; | |
| 132 use base qw(IMPL::Config); | |
| 49 | 133 |
| 134 use IMPL::Class::Property; | |
| 135 use IMPL::Config::Class; | |
| 136 | |
| 137 BEGIN { | |
| 138 public property SimpleString => prop_all; | |
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139 public property DataSource => prop_all; |
| 49 | 140 } |
| 141 | |
| 142 sub CTOR { | |
| 143 my $this = shift; | |
| 73 | 144 |
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145 $this->DataSource( |
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146 new IMPL::Config::Activator( |
| 73 | 147 factory => 'MyDataSource', |
| 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'); |
| 49 | 154 } |
| 155 | |
| 73 | 156 # using application object |
| 58 | 157 |
| 73 | 158 my $app = spawn MyApp('default.xml'); |
| 58 | 159 |
| 160 $app->Run(); | |
| 161 | |
| 73 | 162 =end code |
| 163 | |
| 164 Ниже приведен пример файла C<default.xml> содержащего настройки приложения | |
| 165 | |
| 166 =begin code xml | |
| 167 | |
| 168 <app type='MyApp'> | |
| 169 <SimpleString>The application</SimpleString> | |
| 170 <DataSource type='IMPL::Config::Activator'> | |
| 171 <factory>MyDataSourceClass</factory> | |
| 172 <parameters type='HASH'> | |
| 173 <host>localhost</host> | |
| 174 <user>dbuser</user> | |
| 175 </parameters> | |
| 176 </DataSource> | |
| 177 </app> | |
| 178 | |
| 179 =end code xml | |
| 180 | |
| 49 | 181 =head1 DESCRIPTION |
| 182 | |
| 73 | 183 C<[Serializable]> |
| 184 | |
| 185 C<[Autofill]> | |
| 186 | |
| 187 C<use base IMPL::Object::Accessor> | |
| 188 | |
| 189 Базовый класс для приложений. Использует подход, что приложение | |
| 190 является объектом, состояние которого предтавляет собой конфигурацию, | |
| 191 а методы - логику. | |
| 192 | |
| 193 Данный класс реализует функционал десериализации (и сериализации) экземпляра | |
| 194 приложения из XML документа. Для этого используется механизм C<IMPL::Serialization>. | |
| 195 При этом используются опции C<IMPL::Serialization::XmlFormatter> C<IdentOutput> и | |
| 196 C<SkipWhitespace> для записи документа в легко читаемом виде. | |
| 197 | |
| 198 Поскольку в результате восстановления приложения восстанавливаются все элементы | |
| 199 из файла конфигурации, то это может потребовать значительных ресурсов для | |
| 200 создания частей, которые могут никогда не понадобиться. Например, не требуется инициализация | |
| 201 источника данных для передачи пользователю статических данных, сохраненных на диске. | |
| 202 | |
| 203 Для решения этой проблемы используются специальные объекты C<IMPL::Config::Activator>. | |
| 204 | |
| 205 Если у приложения описано свойство, в котором хранится C<IMPL::Config::Activator>, то | |
| 206 при первом обращении к такому свойству, будет создан объект вызовом метода | |
| 207 C<< IMPL::Config::Activator->activate() >> и возвращен как значение этого свойства. | |
| 208 Таким образом реализуется прозрачная отложенная активация объектов, что позволяет | |
| 209 экономить ресурсы. | |
| 49 | 210 |
| 211 =head1 MEMBERS | |
| 212 | |
| 213 =over | |
| 214 | |
| 73 | 215 =item C<[static] LoadXMLFile($fileName) > |
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216 |
| 73 | 217 Создает из XML файла C<$fileName> экземпляр приложения |
| 49 | 218 |
| 73 | 219 =item C<SaveXMLFile($fileName)> |
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220 |
| 73 | 221 Сохраняет приложение в файл C<$fileName> |
| 222 | |
| 223 =item C<[get] xml > | |
| 49 | 224 |
| 73 | 225 Сохраняет конфигурацию приложения в XML строку. |
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226 |
| 73 | 227 =item C<[static,operator] spawn($file)> |
| 49 | 228 |
| 73 | 229 Синоним для C<LoadXMLFile>, предполагается использование как оператора. |
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230 |
| 73 | 231 =item C<rawGet($propname,...)> |
| 232 | |
| 233 Метод для получения значений свойств приложения. Данный метод позволяет избежать | |
| 234 использование активации объектов через C<IMPL::Config::Activator>. | |
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235 |
| 49 | 236 =back |
| 237 | |
| 238 =cut |