annotate Lib/IMPL/Config.pm @ 203:68a59c3358ff

Implemented templates selection mechanism
author sergey
date Wed, 25 Apr 2012 18:06:11 +0400
parents 4d0e1962161c
children d63f9a92d6d4
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1 package IMPL::Config;
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2 use strict;
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3 use warnings;
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4
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5 use parent qw(IMPL::Object::Accessor IMPL::Object::Serializable IMPL::Object::Autofill);
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6
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7 __PACKAGE__->PassThroughArgs;
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8
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9 use File::Spec();
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10
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11 use IMPL::Class::Member;
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12 use IMPL::Class::PropertyInfo;
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13 use IMPL::Exception;
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14
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15 use IMPL::Serialization;
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16 use IMPL::Serialization::XmlFormatter;
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17
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18 our $ConfigBase ||= '';
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19
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20 sub LoadXMLFile {
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21 my ($self,$file) = @_;
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22
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23 my $class = ref $self || $self;
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24
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25 my $serializer = new IMPL::Serializer(
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26 Formatter => new IMPL::Serialization::XmlFormatter(
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27 IdentOutput => 1,
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28 SkipWhitespace => 1
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29 )
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30 );
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31
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32 open my $hFile,'<',$file or die new IMPL::Exception("Failed to open file",$file,$!);
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33
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34 my $obj;
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35 eval {
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36 $obj = $serializer->Deserialize($hFile);
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37 };
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38
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39 if ($@) {
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40 my $e=$@;
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41 die new IMPL::Exception("Can't load the configuration file",$file,$e);
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42 }
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43 return $obj;
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44 }
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45
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46 sub SaveXMLFile {
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47 my ($this,$file) = @_;
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48
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49 my $serializer = new IMPL::Serializer(
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50 Formatter => new IMPL::Serialization::XmlFormatter(
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51 IdentOutput => 1,
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52 SkipWhitespace => 1
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53 )
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54 );
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55
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56 open my $hFile,'>',$file or die new IMPL::Exception("Failed to open file",$file,$!);
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57
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58 $serializer->Serialize($hFile, $this);
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59 }
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60
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61 sub xml {
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62 my $this = shift;
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63 my $serializer = new IMPL::Serializer(
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64 Formatter => new IMPL::Serialization::XmlFormatter(
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65 IdentOutput => 1,
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66 SkipWhitespace => 1
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67 )
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68 );
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69 my $str = '';
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70 open my $hFile,'>',\$str or die new IMPL::Exception("Failed to open stream",$!);
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71
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72 $serializer->Serialize($hFile, $this);
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73
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74 undef $hFile;
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75
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76 return $str;
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77 }
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78
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79 sub save {
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80 my ($this,$ctx) = @_;
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82 my $val;
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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 $_->canGet;
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89 },
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90 1);
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91 }
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92
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93 sub spawn {
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94 my ($this,$file) = @_;
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95 unless ($file) {
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96 ($file = ref $this || $this) =~ s/:+/./g;
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97 $file .= ".xml";
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98 }
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99 return $this->LoadXMLFile( File::Spec->catfile($ConfigBase,$file) );
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100 }
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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
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123 1;
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124 __END__
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125
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126 =pod
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127
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128 =head1 NAME
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129
180
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130 C<IMPL::Config> - базовый класс для настраиваемого приложения.
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131
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132 =head1 SYNOPSIS
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133
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134 =begin code
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135
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136 # define application
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137
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138 package MyApp;
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139 use parent qw(IMPL::Config);
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140
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141 use IMPL::Class::Property;
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142 use IMPL::Config::Class;
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143
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144 BEGIN {
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145 public property SimpleString => prop_all;
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146 public property DataSource => prop_all;
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147 }
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148
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149 sub CTOR {
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150 my $this = shift;
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151
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152 $this->DataSource(
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153 new IMPL::Config::Activator(
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154 factory => 'MyDataSource',
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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');
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161 }
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162
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163 # using application object
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164
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165 my $app = spawn MyApp('default.xml');
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166
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167 $app->Run();
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168
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169 =end code
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170
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171 Ниже приведен пример файла C<default.xml> содержащего настройки приложения
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172
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173 =begin code xml
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174
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175 <app type='MyApp'>
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176 <SimpleString>The application</SimpleString>
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177 <DataSource type='IMPL::Config::Activator'>
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178 <factory>MyDataSourceClass</factory>
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179 <parameters type='HASH'>
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180 <host>localhost</host>
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181 <user>dbuser</user>
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182 </parameters>
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183 </DataSource>
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184 </app>
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185
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186 =end code xml
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187
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188 =head1 DESCRIPTION
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189
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190 C<[Serializable]>
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191
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192 C<[Autofill]>
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193
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194 C<use parent IMPL::Object::Accessor>
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195
180
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196 Базовый класс для приложений. Использует подход, что приложение
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197 является объектом, состояние которого предтавляет собой конфигурацию,
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198 а методы - логику.
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199
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200 Данный класс реализует функционал десериализации (и сериализации) экземпляра
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201 приложения из XML документа. Для этого используется механизм C<IMPL::Serialization>.
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202 При этом используются опции C<IMPL::Serialization::XmlFormatter> C<IdentOutput> и
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203 C<SkipWhitespace> для записи документа в легко читаемом виде.
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204
180
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205 Поскольку в результате восстановления приложения восстанавливаются все элементы
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206 из файла конфигурации, то это может потребовать значительных ресурсов для
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207 создания частей, которые могут никогда не понадобиться. Например, не требуется инициализация
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208 источника данных для передачи пользователю статических данных, сохраненных на диске.
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209
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210 Для решения этой проблемы используются специальные объекты C<IMPL::Config::Activator>.
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211
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212 Если у приложения описано свойство, в котором хранится C<IMPL::Config::Activator>, то
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213 при первом обращении к такому свойству, будет создан объект вызовом метода
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214 C<< IMPL::Config::Activator->activate() >> и возвращен как значение этого свойства.
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215 Таким образом реализуется прозрачная отложенная активация объектов, что позволяет
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216 экономить ресурсы.
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217
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218 =head1 MEMBERS
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219
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220 =over
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221
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222 =item C<[static] LoadXMLFile($fileName) >
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223
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224 Создает из XML файла C<$fileName> экземпляр приложения
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225
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226 =item C<SaveXMLFile($fileName)>
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227
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228 Сохраняет приложение в файл C<$fileName>
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229
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230 =item C<[get] xml >
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231
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232 Сохраняет конфигурацию приложения в XML строку.
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233
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234 =item C<[static,operator] spawn($file)>
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235
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236 Синоним для C<LoadXMLFile>, предполагается использование как оператора.
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237
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238 =item C<rawGet($propname,...)>
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239
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240 Метод для получения значений свойств приложения. Данный метод позволяет избежать
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241 использование активации объектов через C<IMPL::Config::Activator>.
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242
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243 =back
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244
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245 =cut