Mercurial > pub > Impl
annotate Lib/IMPL/Config.pm @ 292:6dc1c369eb71
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| author | cin |
|---|---|
| date | Tue, 26 Feb 2013 02:21:03 +0400 |
| parents | 4ddb27ff4a0b |
| children | 212cc86e470b |
| rev | line source |
|---|---|
| 49 | 1 package IMPL::Config; |
| 2 use strict; | |
| 3 use warnings; | |
| 4 | |
| 278 | 5 use IMPL::Const qw(:access); |
| 263 | 6 use IMPL::declare { |
| 7 base => [ | |
| 8 'IMPL::Object::Accessor' => undef, | |
| 9 'IMPL::Object::Serializable' => undef, | |
| 10 'IMPL::Object::Autofill' => '@_' | |
| 11 ] | |
| 12 }; | |
| 49 | 13 |
| 170 | 14 use File::Spec(); |
| 15 | |
| 49 | 16 use IMPL::Class::Member; |
| 17 use IMPL::Class::PropertyInfo; | |
| 18 use IMPL::Exception; | |
| 19 | |
| 20 use IMPL::Serialization; | |
| 21 use IMPL::Serialization::XmlFormatter; | |
| 22 | |
| 170 | 23 our $ConfigBase ||= ''; |
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24 our $AppBase; |
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25 |
| 49 | 26 sub LoadXMLFile { |
| 27 my ($self,$file) = @_; | |
| 28 | |
| 29 my $class = ref $self || $self; | |
| 30 | |
| 31 my $serializer = new IMPL::Serializer( | |
| 278 | 32 formatter => new IMPL::Serialization::XmlFormatter( |
| 49 | 33 IdentOutput => 1, |
| 34 SkipWhitespace => 1 | |
| 35 ) | |
| 36 ); | |
| 37 | |
| 38 open my $hFile,'<',$file or die new IMPL::Exception("Failed to open file",$file,$!); | |
| 39 | |
| 40 my $obj; | |
| 41 eval { | |
| 42 $obj = $serializer->Deserialize($hFile); | |
| 43 }; | |
| 44 | |
| 45 if ($@) { | |
| 46 my $e=$@; | |
| 47 die new IMPL::Exception("Can't load the configuration file",$file,$e); | |
| 48 } | |
| 49 return $obj; | |
| 50 } | |
| 51 | |
| 52 sub SaveXMLFile { | |
| 53 my ($this,$file) = @_; | |
| 54 | |
| 55 my $serializer = new IMPL::Serializer( | |
| 278 | 56 formatter => new IMPL::Serialization::XmlFormatter( |
| 49 | 57 IdentOutput => 1, |
| 58 SkipWhitespace => 1 | |
| 59 ) | |
| 60 ); | |
| 61 | |
| 62 open my $hFile,'>',$file or die new IMPL::Exception("Failed to open file",$file,$!); | |
| 63 | |
| 64 $serializer->Serialize($hFile, $this); | |
| 65 } | |
| 66 | |
| 67 sub xml { | |
| 68 my $this = shift; | |
| 69 my $serializer = new IMPL::Serializer( | |
| 278 | 70 formatter => new IMPL::Serialization::XmlFormatter( |
| 49 | 71 IdentOutput => 1, |
| 72 SkipWhitespace => 1 | |
| 73 ) | |
| 74 ); | |
| 75 my $str = ''; | |
| 76 open my $hFile,'>',\$str or die new IMPL::Exception("Failed to open stream",$!); | |
| 77 | |
| 78 $serializer->Serialize($hFile, $this); | |
| 79 | |
| 80 undef $hFile; | |
| 81 | |
| 82 return $str; | |
| 83 } | |
| 84 | |
| 85 sub save { | |
| 86 my ($this,$ctx) = @_; | |
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87 |
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88 my $val; |
| 49 | 89 |
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90 $val = $this->rawGet($_) and $ctx->AddVar($_ => $val) foreach map $_->Name, $this->get_meta( |
| 194 | 91 'IMPL::Class::PropertyInfo', |
| 92 sub { | |
| 278 | 93 $_->access == ACCESS_PUBLIC and |
| 94 $_->setter; | |
| 194 | 95 }, |
| 96 1); | |
| 49 | 97 } |
| 98 | |
| 58 | 99 sub spawn { |
| 194 | 100 my ($this,$file) = @_; |
| 101 unless ($file) { | |
| 102 ($file = ref $this || $this) =~ s/:+/./g; | |
| 103 $file .= ".xml"; | |
| 104 } | |
| 105 return $this->LoadXMLFile( File::Spec->catfile($ConfigBase,$file) ); | |
| 58 | 106 } |
| 107 | |
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108 sub get { |
| 194 | 109 my $this = shift; |
| 110 | |
| 111 if (@_ == 1) { | |
| 112 my $obj = $this->SUPER::get(@_); | |
| 113 return UNIVERSAL::isa($obj,'IMPL::Config::Activator') ? $obj->activate : $obj; | |
| 114 } else { | |
| 115 my @objs = $this->SUPER::get(@_); | |
| 116 return map UNIVERSAL::isa($_,'IMPL::Config::Activator') ? $_->activate : $_, @objs ; | |
| 117 } | |
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118 } |
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119 |
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120 sub rawGet { |
| 194 | 121 my $this = shift; |
| 122 return $this->SUPER::get(@_); | |
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123 } |
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124 |
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125 sub Exists { |
| 194 | 126 $_[0]->SUPER::get($_[1]) ? 1 : 0; |
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127 } |
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128 |
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129 sub AppBase { |
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130 shift; |
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131 File::Spec->catdir($AppBase,@_); |
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132 } |
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133 |
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134 sub ConfigBase { |
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135 shift; |
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136 File::Spec->catdir($ConfigBase,@_); |
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137 } |
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138 |
| 49 | 139 1; |
| 140 __END__ | |
| 141 | |
| 142 =pod | |
| 143 | |
| 73 | 144 =head1 NAME |
| 145 | |
| 180 | 146 C<IMPL::Config> - базовый класс для настраиваемого приложения. |
| 73 | 147 |
| 148 =head1 SYNOPSIS | |
| 49 | 149 |
| 73 | 150 =begin code |
| 151 | |
| 152 # define application | |
| 153 | |
| 154 package MyApp; | |
| 165 | 155 use parent qw(IMPL::Config); |
| 49 | 156 |
| 157 use IMPL::Class::Property; | |
| 158 use IMPL::Config::Class; | |
| 159 | |
| 160 BEGIN { | |
| 161 public property SimpleString => prop_all; | |
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162 public property DataSource => prop_all; |
| 49 | 163 } |
| 164 | |
| 165 sub CTOR { | |
| 166 my $this = shift; | |
| 73 | 167 |
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168 $this->DataSource( |
| 194 | 169 new IMPL::Config::Activator( |
| 170 factory => 'MyDataSource', | |
| 171 parameters=>{ | |
| 172 host => 'localhost', | |
| 173 user => 'dbuser' | |
| 174 } | |
| 175 ) | |
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176 ) unless $this->Exists('DataSource'); |
| 49 | 177 } |
| 178 | |
| 73 | 179 # using application object |
| 58 | 180 |
| 73 | 181 my $app = spawn MyApp('default.xml'); |
| 58 | 182 |
| 183 $app->Run(); | |
| 184 | |
| 73 | 185 =end code |
| 186 | |
| 180 | 187 Ниже приведен пример файла C<default.xml> содержащего настройки приложения |
| 73 | 188 |
| 189 =begin code xml | |
| 190 | |
| 191 <app type='MyApp'> | |
| 194 | 192 <SimpleString>The application</SimpleString> |
| 193 <DataSource type='IMPL::Config::Activator'> | |
| 194 <factory>MyDataSourceClass</factory> | |
| 195 <parameters type='HASH'> | |
| 196 <host>localhost</host> | |
| 197 <user>dbuser</user> | |
| 198 </parameters> | |
| 199 </DataSource> | |
| 73 | 200 </app> |
| 201 | |
| 202 =end code xml | |
| 203 | |
| 49 | 204 =head1 DESCRIPTION |
| 205 | |
| 73 | 206 C<[Serializable]> |
| 207 | |
| 208 C<[Autofill]> | |
| 209 | |
| 165 | 210 C<use parent IMPL::Object::Accessor> |
| 73 | 211 |
| 180 | 212 Базовый класс для приложений. Использует подход, что приложение |
| 213 является объектом, состояние которого предтавляет собой конфигурацию, | |
| 214 а методы - логику. | |
| 73 | 215 |
| 180 | 216 Данный класс реализует функционал десериализации (и сериализации) экземпляра |
| 217 приложения из XML документа. Для этого используется механизм C<IMPL::Serialization>. | |
| 218 При этом используются опции C<IMPL::Serialization::XmlFormatter> C<IdentOutput> и | |
| 219 C<SkipWhitespace> для записи документа в легко читаемом виде. | |
| 73 | 220 |
| 180 | 221 Поскольку в результате восстановления приложения восстанавливаются все элементы |
| 222 из файла конфигурации, то это может потребовать значительных ресурсов для | |
| 223 создания частей, которые могут никогда не понадобиться. Например, не требуется инициализация | |
| 224 источника данных для передачи пользователю статических данных, сохраненных на диске. | |
| 73 | 225 |
| 180 | 226 Для решения этой проблемы используются специальные объекты C<IMPL::Config::Activator>. |
| 73 | 227 |
| 180 | 228 Если у приложения описано свойство, в котором хранится C<IMPL::Config::Activator>, то |
| 229 при первом обращении к такому свойству, будет создан объект вызовом метода | |
| 230 C<< IMPL::Config::Activator->activate() >> и возвращен как значение этого свойства. | |
| 231 Таким образом реализуется прозрачная отложенная активация объектов, что позволяет | |
| 232 экономить ресурсы. | |
| 49 | 233 |
| 234 =head1 MEMBERS | |
| 235 | |
| 236 =over | |
| 237 | |
| 73 | 238 =item C<[static] LoadXMLFile($fileName) > |
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239 |
| 180 | 240 Создает из XML файла C<$fileName> экземпляр приложения |
| 49 | 241 |
| 73 | 242 =item C<SaveXMLFile($fileName)> |
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243 |
| 180 | 244 Сохраняет приложение в файл C<$fileName> |
| 73 | 245 |
| 246 =item C<[get] xml > | |
| 49 | 247 |
| 180 | 248 Сохраняет конфигурацию приложения в XML строку. |
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249 |
| 73 | 250 =item C<[static,operator] spawn($file)> |
| 49 | 251 |
| 180 | 252 Синоним для C<LoadXMLFile>, предполагается использование как оператора. |
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253 |
| 73 | 254 =item C<rawGet($propname,...)> |
| 255 | |
| 180 | 256 Метод для получения значений свойств приложения. Данный метод позволяет избежать |
| 257 использование активации объектов через C<IMPL::Config::Activator>. | |
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258 |
| 49 | 259 =back |
| 260 | |
| 261 =cut |