Mercurial > pub > Impl
annotate Lib/IMPL/Config.pm @ 213:d6e2ea24af08
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| author | sergey |
|---|---|
| date | Fri, 03 Aug 2012 01:15:15 +0400 |
| parents | 891c04080658 |
| children | 0f59b2de72af |
| rev | line source |
|---|---|
| 49 | 1 package IMPL::Config; |
| 2 use strict; | |
| 3 use warnings; | |
| 4 | |
| 165 | 5 use parent qw(IMPL::Object::Accessor IMPL::Object::Serializable IMPL::Object::Autofill); |
| 49 | 6 |
| 7 __PACKAGE__->PassThroughArgs; | |
| 8 | |
| 170 | 9 use File::Spec(); |
| 10 | |
| 49 | 11 use IMPL::Class::Member; |
| 12 use IMPL::Class::PropertyInfo; | |
| 13 use IMPL::Exception; | |
| 14 | |
| 15 use IMPL::Serialization; | |
| 16 use IMPL::Serialization::XmlFormatter; | |
| 17 | |
| 170 | 18 our $ConfigBase ||= ''; |
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19 our $AppBase; |
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20 |
| 49 | 21 sub LoadXMLFile { |
| 22 my ($self,$file) = @_; | |
| 23 | |
| 24 my $class = ref $self || $self; | |
| 25 | |
| 26 my $serializer = new IMPL::Serializer( | |
| 27 Formatter => new IMPL::Serialization::XmlFormatter( | |
| 28 IdentOutput => 1, | |
| 29 SkipWhitespace => 1 | |
| 30 ) | |
| 31 ); | |
| 32 | |
| 33 open my $hFile,'<',$file or die new IMPL::Exception("Failed to open file",$file,$!); | |
| 34 | |
| 35 my $obj; | |
| 36 eval { | |
| 37 $obj = $serializer->Deserialize($hFile); | |
| 38 }; | |
| 39 | |
| 40 if ($@) { | |
| 41 my $e=$@; | |
| 42 die new IMPL::Exception("Can't load the configuration file",$file,$e); | |
| 43 } | |
| 44 return $obj; | |
| 45 } | |
| 46 | |
| 47 sub SaveXMLFile { | |
| 48 my ($this,$file) = @_; | |
| 49 | |
| 50 my $serializer = new IMPL::Serializer( | |
| 51 Formatter => new IMPL::Serialization::XmlFormatter( | |
| 52 IdentOutput => 1, | |
| 53 SkipWhitespace => 1 | |
| 54 ) | |
| 55 ); | |
| 56 | |
| 57 open my $hFile,'>',$file or die new IMPL::Exception("Failed to open file",$file,$!); | |
| 58 | |
| 59 $serializer->Serialize($hFile, $this); | |
| 60 } | |
| 61 | |
| 62 sub xml { | |
| 63 my $this = shift; | |
| 64 my $serializer = new IMPL::Serializer( | |
| 65 Formatter => new IMPL::Serialization::XmlFormatter( | |
| 66 IdentOutput => 1, | |
| 67 SkipWhitespace => 1 | |
| 68 ) | |
| 69 ); | |
| 70 my $str = ''; | |
| 71 open my $hFile,'>',\$str or die new IMPL::Exception("Failed to open stream",$!); | |
| 72 | |
| 73 $serializer->Serialize($hFile, $this); | |
| 74 | |
| 75 undef $hFile; | |
| 76 | |
| 77 return $str; | |
| 78 } | |
| 79 | |
| 80 sub save { | |
| 81 my ($this,$ctx) = @_; | |
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82 |
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83 my $val; |
| 49 | 84 |
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85 $val = $this->rawGet($_) and $ctx->AddVar($_ => $val) foreach map $_->Name, $this->get_meta( |
| 194 | 86 'IMPL::Class::PropertyInfo', |
| 87 sub { | |
| 88 $_->Access == IMPL::Class::Member::MOD_PUBLIC and | |
| 89 $_->canGet; | |
| 90 }, | |
| 91 1); | |
| 49 | 92 } |
| 93 | |
| 58 | 94 sub spawn { |
| 194 | 95 my ($this,$file) = @_; |
| 96 unless ($file) { | |
| 97 ($file = ref $this || $this) =~ s/:+/./g; | |
| 98 $file .= ".xml"; | |
| 99 } | |
| 100 return $this->LoadXMLFile( File::Spec->catfile($ConfigBase,$file) ); | |
| 58 | 101 } |
| 102 | |
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103 sub get { |
| 194 | 104 my $this = shift; |
| 105 | |
| 106 if (@_ == 1) { | |
| 107 my $obj = $this->SUPER::get(@_); | |
| 108 return UNIVERSAL::isa($obj,'IMPL::Config::Activator') ? $obj->activate : $obj; | |
| 109 } else { | |
| 110 my @objs = $this->SUPER::get(@_); | |
| 111 return map UNIVERSAL::isa($_,'IMPL::Config::Activator') ? $_->activate : $_, @objs ; | |
| 112 } | |
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113 } |
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114 |
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115 sub rawGet { |
| 194 | 116 my $this = shift; |
| 117 return $this->SUPER::get(@_); | |
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118 } |
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119 |
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120 sub Exists { |
| 194 | 121 $_[0]->SUPER::get($_[1]) ? 1 : 0; |
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122 } |
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123 |
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124 sub AppBase { |
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125 shift; |
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126 File::Spec->catdir($AppBase,@_); |
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127 } |
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128 |
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129 sub ConfigBase { |
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130 shift; |
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131 File::Spec->catdir($ConfigBase,@_); |
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132 } |
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133 |
| 49 | 134 1; |
| 135 __END__ | |
| 136 | |
| 137 =pod | |
| 138 | |
| 73 | 139 =head1 NAME |
| 140 | |
| 180 | 141 C<IMPL::Config> - базовый класс для настраиваемого приложения. |
| 73 | 142 |
| 143 =head1 SYNOPSIS | |
| 49 | 144 |
| 73 | 145 =begin code |
| 146 | |
| 147 # define application | |
| 148 | |
| 149 package MyApp; | |
| 165 | 150 use parent qw(IMPL::Config); |
| 49 | 151 |
| 152 use IMPL::Class::Property; | |
| 153 use IMPL::Config::Class; | |
| 154 | |
| 155 BEGIN { | |
| 156 public property SimpleString => prop_all; | |
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157 public property DataSource => prop_all; |
| 49 | 158 } |
| 159 | |
| 160 sub CTOR { | |
| 161 my $this = shift; | |
| 73 | 162 |
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163 $this->DataSource( |
| 194 | 164 new IMPL::Config::Activator( |
| 165 factory => 'MyDataSource', | |
| 166 parameters=>{ | |
| 167 host => 'localhost', | |
| 168 user => 'dbuser' | |
| 169 } | |
| 170 ) | |
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171 ) unless $this->Exists('DataSource'); |
| 49 | 172 } |
| 173 | |
| 73 | 174 # using application object |
| 58 | 175 |
| 73 | 176 my $app = spawn MyApp('default.xml'); |
| 58 | 177 |
| 178 $app->Run(); | |
| 179 | |
| 73 | 180 =end code |
| 181 | |
| 180 | 182 Ниже приведен пример файла C<default.xml> содержащего настройки приложения |
| 73 | 183 |
| 184 =begin code xml | |
| 185 | |
| 186 <app type='MyApp'> | |
| 194 | 187 <SimpleString>The application</SimpleString> |
| 188 <DataSource type='IMPL::Config::Activator'> | |
| 189 <factory>MyDataSourceClass</factory> | |
| 190 <parameters type='HASH'> | |
| 191 <host>localhost</host> | |
| 192 <user>dbuser</user> | |
| 193 </parameters> | |
| 194 </DataSource> | |
| 73 | 195 </app> |
| 196 | |
| 197 =end code xml | |
| 198 | |
| 49 | 199 =head1 DESCRIPTION |
| 200 | |
| 73 | 201 C<[Serializable]> |
| 202 | |
| 203 C<[Autofill]> | |
| 204 | |
| 165 | 205 C<use parent IMPL::Object::Accessor> |
| 73 | 206 |
| 180 | 207 Базовый класс для приложений. Использует подход, что приложение |
| 208 является объектом, состояние которого предтавляет собой конфигурацию, | |
| 209 а методы - логику. | |
| 73 | 210 |
| 180 | 211 Данный класс реализует функционал десериализации (и сериализации) экземпляра |
| 212 приложения из XML документа. Для этого используется механизм C<IMPL::Serialization>. | |
| 213 При этом используются опции C<IMPL::Serialization::XmlFormatter> C<IdentOutput> и | |
| 214 C<SkipWhitespace> для записи документа в легко читаемом виде. | |
| 73 | 215 |
| 180 | 216 Поскольку в результате восстановления приложения восстанавливаются все элементы |
| 217 из файла конфигурации, то это может потребовать значительных ресурсов для | |
| 218 создания частей, которые могут никогда не понадобиться. Например, не требуется инициализация | |
| 219 источника данных для передачи пользователю статических данных, сохраненных на диске. | |
| 73 | 220 |
| 180 | 221 Для решения этой проблемы используются специальные объекты C<IMPL::Config::Activator>. |
| 73 | 222 |
| 180 | 223 Если у приложения описано свойство, в котором хранится C<IMPL::Config::Activator>, то |
| 224 при первом обращении к такому свойству, будет создан объект вызовом метода | |
| 225 C<< IMPL::Config::Activator->activate() >> и возвращен как значение этого свойства. | |
| 226 Таким образом реализуется прозрачная отложенная активация объектов, что позволяет | |
| 227 экономить ресурсы. | |
| 49 | 228 |
| 229 =head1 MEMBERS | |
| 230 | |
| 231 =over | |
| 232 | |
| 73 | 233 =item C<[static] LoadXMLFile($fileName) > |
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234 |
| 180 | 235 Создает из XML файла C<$fileName> экземпляр приложения |
| 49 | 236 |
| 73 | 237 =item C<SaveXMLFile($fileName)> |
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238 |
| 180 | 239 Сохраняет приложение в файл C<$fileName> |
| 73 | 240 |
| 241 =item C<[get] xml > | |
| 49 | 242 |
| 180 | 243 Сохраняет конфигурацию приложения в XML строку. |
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244 |
| 73 | 245 =item C<[static,operator] spawn($file)> |
| 49 | 246 |
| 180 | 247 Синоним для C<LoadXMLFile>, предполагается использование как оператора. |
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248 |
| 73 | 249 =item C<rawGet($propname,...)> |
| 250 | |
| 180 | 251 Метод для получения значений свойств приложения. Данный метод позволяет избежать |
| 252 использование активации объектов через C<IMPL::Config::Activator>. | |
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253 |
| 49 | 254 =back |
| 255 | |
| 256 =cut |