Mercurial > pub > Impl
annotate Lib/IMPL/Config.pm @ 189:08015e2803f1
IMPL::Vew::Web - fixed memory leaks, more tests
| author | cin |
|---|---|
| date | Wed, 04 Apr 2012 02:49:45 +0400 |
| parents | d1676be8afcc |
| children | 4d0e1962161c |
| 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,$file) = @_; |
| 179 | 95 unless ($file) { |
| 96 ($file = ref $this || $this) =~ s/:+/./g; | |
| 97 $file .= ".xml"; | |
| 98 } | |
| 170 | 99 return $this->LoadXMLFile( File::Spec->catfile($ConfigBase,$file) ); |
| 58 | 100 } |
| 101 | |
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102 sub get { |
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103 my $this = shift; |
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104 |
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105 if (@_ == 1) { |
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106 my $obj = $this->SUPER::get(@_); |
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107 return UNIVERSAL::isa($obj,'IMPL::Config::Activator') ? $obj->activate : $obj; |
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108 } else { |
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109 my @objs = $this->SUPER::get(@_); |
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110 return map UNIVERSAL::isa($_,'IMPL::Config::Activator') ? $_->activate : $_, @objs ; |
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111 } |
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112 } |
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113 |
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114 sub rawGet { |
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115 my $this = shift; |
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116 return $this->SUPER::get(@_); |
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117 } |
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118 |
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119 sub Exists { |
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120 $_[0]->SUPER::get($_[1]) ? 1 : 0; |
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121 } |
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122 |
| 49 | 123 1; |
| 124 __END__ | |
| 125 | |
| 126 =pod | |
| 127 | |
| 73 | 128 =head1 NAME |
| 129 | |
| 180 | 130 C<IMPL::Config> - базовый класс для настраиваемого приложения. |
| 73 | 131 |
| 132 =head1 SYNOPSIS | |
| 49 | 133 |
| 73 | 134 =begin code |
| 135 | |
| 136 # define application | |
| 137 | |
| 138 package MyApp; | |
| 165 | 139 use parent qw(IMPL::Config); |
| 49 | 140 |
| 141 use IMPL::Class::Property; | |
| 142 use IMPL::Config::Class; | |
| 143 | |
| 144 BEGIN { | |
| 145 public property SimpleString => prop_all; | |
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146 public property DataSource => prop_all; |
| 49 | 147 } |
| 148 | |
| 149 sub CTOR { | |
| 150 my $this = shift; | |
| 73 | 151 |
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152 $this->DataSource( |
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153 new IMPL::Config::Activator( |
| 73 | 154 factory => 'MyDataSource', |
| 155 parameters=>{ | |
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156 host => 'localhost', |
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157 user => 'dbuser' |
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158 } |
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159 ) |
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160 ) unless $this->Exists('DataSource'); |
| 49 | 161 } |
| 162 | |
| 73 | 163 # using application object |
| 58 | 164 |
| 73 | 165 my $app = spawn MyApp('default.xml'); |
| 58 | 166 |
| 167 $app->Run(); | |
| 168 | |
| 73 | 169 =end code |
| 170 | |
| 180 | 171 Ниже приведен пример файла C<default.xml> содержащего настройки приложения |
| 73 | 172 |
| 173 =begin code xml | |
| 174 | |
| 175 <app type='MyApp'> | |
| 176 <SimpleString>The application</SimpleString> | |
| 177 <DataSource type='IMPL::Config::Activator'> | |
| 178 <factory>MyDataSourceClass</factory> | |
| 179 <parameters type='HASH'> | |
| 180 <host>localhost</host> | |
| 181 <user>dbuser</user> | |
| 182 </parameters> | |
| 183 </DataSource> | |
| 184 </app> | |
| 185 | |
| 186 =end code xml | |
| 187 | |
| 49 | 188 =head1 DESCRIPTION |
| 189 | |
| 73 | 190 C<[Serializable]> |
| 191 | |
| 192 C<[Autofill]> | |
| 193 | |
| 165 | 194 C<use parent IMPL::Object::Accessor> |
| 73 | 195 |
| 180 | 196 Базовый класс для приложений. Использует подход, что приложение |
| 197 является объектом, состояние которого предтавляет собой конфигурацию, | |
| 198 а методы - логику. | |
| 73 | 199 |
| 180 | 200 Данный класс реализует функционал десериализации (и сериализации) экземпляра |
| 201 приложения из XML документа. Для этого используется механизм C<IMPL::Serialization>. | |
| 202 При этом используются опции C<IMPL::Serialization::XmlFormatter> C<IdentOutput> и | |
| 203 C<SkipWhitespace> для записи документа в легко читаемом виде. | |
| 73 | 204 |
| 180 | 205 Поскольку в результате восстановления приложения восстанавливаются все элементы |
| 206 из файла конфигурации, то это может потребовать значительных ресурсов для | |
| 207 создания частей, которые могут никогда не понадобиться. Например, не требуется инициализация | |
| 208 источника данных для передачи пользователю статических данных, сохраненных на диске. | |
| 73 | 209 |
| 180 | 210 Для решения этой проблемы используются специальные объекты C<IMPL::Config::Activator>. |
| 73 | 211 |
| 180 | 212 Если у приложения описано свойство, в котором хранится C<IMPL::Config::Activator>, то |
| 213 при первом обращении к такому свойству, будет создан объект вызовом метода | |
| 214 C<< IMPL::Config::Activator->activate() >> и возвращен как значение этого свойства. | |
| 215 Таким образом реализуется прозрачная отложенная активация объектов, что позволяет | |
| 216 экономить ресурсы. | |
| 49 | 217 |
| 218 =head1 MEMBERS | |
| 219 | |
| 220 =over | |
| 221 | |
| 73 | 222 =item C<[static] LoadXMLFile($fileName) > |
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223 |
| 180 | 224 Создает из XML файла C<$fileName> экземпляр приложения |
| 49 | 225 |
| 73 | 226 =item C<SaveXMLFile($fileName)> |
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227 |
| 180 | 228 Сохраняет приложение в файл C<$fileName> |
| 73 | 229 |
| 230 =item C<[get] xml > | |
| 49 | 231 |
| 180 | 232 Сохраняет конфигурацию приложения в XML строку. |
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233 |
| 73 | 234 =item C<[static,operator] spawn($file)> |
| 49 | 235 |
| 180 | 236 Синоним для C<LoadXMLFile>, предполагается использование как оператора. |
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237 |
| 73 | 238 =item C<rawGet($propname,...)> |
| 239 | |
| 180 | 240 Метод для получения значений свойств приложения. Данный метод позволяет избежать |
| 241 использование активации объектов через C<IMPL::Config::Activator>. | |
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242 |
| 49 | 243 =back |
| 244 | |
| 245 =cut |