Mercurial > pub > Impl
annotate Lib/IMPL/Config.pm @ 172:068acfe903c3
corrected schema resolution mechanism
| author | sourcer |
|---|---|
| date | Mon, 20 Jun 2011 23:42:44 +0400 |
| parents | b88b7fe60aa3 |
| children | b3d91ff7aea9 |
| 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 $ConfigBase ||= ''; |
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19 |
| 49 | 20 sub LoadXMLFile { |
| 21 my ($self,$file) = @_; | |
| 22 | |
| 23 my $class = ref $self || $self; | |
| 24 | |
| 25 my $serializer = new IMPL::Serializer( | |
| 26 Formatter => new IMPL::Serialization::XmlFormatter( | |
| 27 IdentOutput => 1, | |
| 28 SkipWhitespace => 1 | |
| 29 ) | |
| 30 ); | |
| 31 | |
| 32 open my $hFile,'<',$file or die new IMPL::Exception("Failed to open file",$file,$!); | |
| 33 | |
| 34 my $obj; | |
| 35 eval { | |
| 36 $obj = $serializer->Deserialize($hFile); | |
| 37 }; | |
| 38 | |
| 39 if ($@) { | |
| 40 my $e=$@; | |
| 41 die new IMPL::Exception("Can't load the configuration file",$file,$e); | |
| 42 } | |
| 43 return $obj; | |
| 44 } | |
| 45 | |
| 46 sub SaveXMLFile { | |
| 47 my ($this,$file) = @_; | |
| 48 | |
| 49 my $serializer = new IMPL::Serializer( | |
| 50 Formatter => new IMPL::Serialization::XmlFormatter( | |
| 51 IdentOutput => 1, | |
| 52 SkipWhitespace => 1 | |
| 53 ) | |
| 54 ); | |
| 55 | |
| 56 open my $hFile,'>',$file or die new IMPL::Exception("Failed to open file",$file,$!); | |
| 57 | |
| 58 $serializer->Serialize($hFile, $this); | |
| 59 } | |
| 60 | |
| 61 sub xml { | |
| 62 my $this = shift; | |
| 63 my $serializer = new IMPL::Serializer( | |
| 64 Formatter => new IMPL::Serialization::XmlFormatter( | |
| 65 IdentOutput => 1, | |
| 66 SkipWhitespace => 1 | |
| 67 ) | |
| 68 ); | |
| 69 my $str = ''; | |
| 70 open my $hFile,'>',\$str or die new IMPL::Exception("Failed to open stream",$!); | |
| 71 | |
| 72 $serializer->Serialize($hFile, $this); | |
| 73 | |
| 74 undef $hFile; | |
| 75 | |
| 76 return $str; | |
| 77 } | |
| 78 | |
| 79 sub save { | |
| 80 my ($this,$ctx) = @_; | |
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81 |
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82 my $val; |
| 49 | 83 |
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84 $val = $this->rawGet($_) and $ctx->AddVar($_ => $val) foreach map $_->Name, $this->get_meta( |
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85 'IMPL::Class::PropertyInfo', |
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86 sub { |
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87 $_->Access == IMPL::Class::Member::MOD_PUBLIC and |
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88 $_->canGet; |
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89 }, |
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90 1); |
| 49 | 91 } |
| 92 | |
| 58 | 93 sub spawn { |
| 170 | 94 my ($this,$file) = @_; |
| 95 return $this->LoadXMLFile( File::Spec->catfile($ConfigBase,$file) ); | |
| 58 | 96 } |
| 97 | |
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98 sub get { |
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99 my $this = shift; |
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100 |
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101 if (@_ == 1) { |
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102 my $obj = $this->SUPER::get(@_); |
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103 return UNIVERSAL::isa($obj,'IMPL::Config::Activator') ? $obj->activate : $obj; |
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104 } else { |
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105 my @objs = $this->SUPER::get(@_); |
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106 return map UNIVERSAL::isa($_,'IMPL::Config::Activator') ? $_->activate : $_, @objs ; |
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107 } |
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108 } |
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109 |
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110 sub rawGet { |
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111 my $this = shift; |
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112 return $this->SUPER::get(@_); |
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113 } |
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114 |
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115 sub Exists { |
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116 $_[0]->SUPER::get($_[1]) ? 1 : 0; |
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117 } |
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118 |
| 49 | 119 1; |
| 120 __END__ | |
| 121 | |
| 122 =pod | |
| 123 | |
| 73 | 124 =head1 NAME |
| 125 | |
| 126 C<IMPL::Config> - базовый класс для настраиваемого приложения. | |
| 127 | |
| 128 =head1 SYNOPSIS | |
| 49 | 129 |
| 73 | 130 =begin code |
| 131 | |
| 132 # define application | |
| 133 | |
| 134 package MyApp; | |
| 165 | 135 use parent qw(IMPL::Config); |
| 49 | 136 |
| 137 use IMPL::Class::Property; | |
| 138 use IMPL::Config::Class; | |
| 139 | |
| 140 BEGIN { | |
| 141 public property SimpleString => prop_all; | |
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142 public property DataSource => prop_all; |
| 49 | 143 } |
| 144 | |
| 145 sub CTOR { | |
| 146 my $this = shift; | |
| 73 | 147 |
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148 $this->DataSource( |
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149 new IMPL::Config::Activator( |
| 73 | 150 factory => 'MyDataSource', |
| 151 parameters=>{ | |
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152 host => 'localhost', |
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153 user => 'dbuser' |
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154 } |
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155 ) |
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156 ) unless $this->Exists('DataSource'); |
| 49 | 157 } |
| 158 | |
| 73 | 159 # using application object |
| 58 | 160 |
| 73 | 161 my $app = spawn MyApp('default.xml'); |
| 58 | 162 |
| 163 $app->Run(); | |
| 164 | |
| 73 | 165 =end code |
| 166 | |
| 167 Ниже приведен пример файла C<default.xml> содержащего настройки приложения | |
| 168 | |
| 169 =begin code xml | |
| 170 | |
| 171 <app type='MyApp'> | |
| 172 <SimpleString>The application</SimpleString> | |
| 173 <DataSource type='IMPL::Config::Activator'> | |
| 174 <factory>MyDataSourceClass</factory> | |
| 175 <parameters type='HASH'> | |
| 176 <host>localhost</host> | |
| 177 <user>dbuser</user> | |
| 178 </parameters> | |
| 179 </DataSource> | |
| 180 </app> | |
| 181 | |
| 182 =end code xml | |
| 183 | |
| 49 | 184 =head1 DESCRIPTION |
| 185 | |
| 73 | 186 C<[Serializable]> |
| 187 | |
| 188 C<[Autofill]> | |
| 189 | |
| 165 | 190 C<use parent IMPL::Object::Accessor> |
| 73 | 191 |
| 192 Базовый класс для приложений. Использует подход, что приложение | |
| 193 является объектом, состояние которого предтавляет собой конфигурацию, | |
| 194 а методы - логику. | |
| 195 | |
| 196 Данный класс реализует функционал десериализации (и сериализации) экземпляра | |
| 197 приложения из XML документа. Для этого используется механизм C<IMPL::Serialization>. | |
| 198 При этом используются опции C<IMPL::Serialization::XmlFormatter> C<IdentOutput> и | |
| 199 C<SkipWhitespace> для записи документа в легко читаемом виде. | |
| 200 | |
| 201 Поскольку в результате восстановления приложения восстанавливаются все элементы | |
| 202 из файла конфигурации, то это может потребовать значительных ресурсов для | |
| 203 создания частей, которые могут никогда не понадобиться. Например, не требуется инициализация | |
| 204 источника данных для передачи пользователю статических данных, сохраненных на диске. | |
| 205 | |
| 206 Для решения этой проблемы используются специальные объекты C<IMPL::Config::Activator>. | |
| 207 | |
| 208 Если у приложения описано свойство, в котором хранится C<IMPL::Config::Activator>, то | |
| 209 при первом обращении к такому свойству, будет создан объект вызовом метода | |
| 210 C<< IMPL::Config::Activator->activate() >> и возвращен как значение этого свойства. | |
| 211 Таким образом реализуется прозрачная отложенная активация объектов, что позволяет | |
| 212 экономить ресурсы. | |
| 49 | 213 |
| 214 =head1 MEMBERS | |
| 215 | |
| 216 =over | |
| 217 | |
| 73 | 218 =item C<[static] LoadXMLFile($fileName) > |
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219 |
| 73 | 220 Создает из XML файла C<$fileName> экземпляр приложения |
| 49 | 221 |
| 73 | 222 =item C<SaveXMLFile($fileName)> |
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223 |
| 73 | 224 Сохраняет приложение в файл C<$fileName> |
| 225 | |
| 226 =item C<[get] xml > | |
| 49 | 227 |
| 73 | 228 Сохраняет конфигурацию приложения в XML строку. |
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229 |
| 73 | 230 =item C<[static,operator] spawn($file)> |
| 49 | 231 |
| 73 | 232 Синоним для C<LoadXMLFile>, предполагается использование как оператора. |
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233 |
| 73 | 234 =item C<rawGet($propname,...)> |
| 235 | |
| 236 Метод для получения значений свойств приложения. Данный метод позволяет избежать | |
| 237 использование активации объектов через C<IMPL::Config::Activator>. | |
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238 |
| 49 | 239 =back |
| 240 | |
| 241 =cut |