annotate Lib/IMPL/Config.pm @ 274:8d36073411b1

+Added AutoDispose class *code cleanups
author cin
date Wed, 30 Jan 2013 03:30:28 +0400
parents 0f59b2de72af
children 4ddb27ff4a0b
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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 IMPL::declare {
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6 base => [
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7 'IMPL::Object::Accessor' => undef,
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8 'IMPL::Object::Serializable' => undef,
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9 'IMPL::Object::Autofill' => '@_'
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10 ]
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11 };
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12
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13 use File::Spec();
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14
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15 use IMPL::Class::Member;
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16 use IMPL::Class::PropertyInfo;
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17 use IMPL::Exception;
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18
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19 use IMPL::Serialization;
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20 use IMPL::Serialization::XmlFormatter;
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21
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22 our $ConfigBase ||= '';
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23 our $AppBase;
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24
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25 sub LoadXMLFile {
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26 my ($self,$file) = @_;
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27
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28 my $class = ref $self || $self;
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29
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30 my $serializer = new IMPL::Serializer(
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31 Formatter => new IMPL::Serialization::XmlFormatter(
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32 IdentOutput => 1,
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33 SkipWhitespace => 1
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34 )
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35 );
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36
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37 open my $hFile,'<',$file or die new IMPL::Exception("Failed to open file",$file,$!);
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38
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39 my $obj;
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40 eval {
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41 $obj = $serializer->Deserialize($hFile);
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42 };
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43
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44 if ($@) {
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45 my $e=$@;
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46 die new IMPL::Exception("Can't load the configuration file",$file,$e);
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47 }
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48 return $obj;
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49 }
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50
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51 sub SaveXMLFile {
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52 my ($this,$file) = @_;
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53
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54 my $serializer = new IMPL::Serializer(
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55 Formatter => new IMPL::Serialization::XmlFormatter(
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56 IdentOutput => 1,
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57 SkipWhitespace => 1
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58 )
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59 );
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60
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61 open my $hFile,'>',$file or die new IMPL::Exception("Failed to open file",$file,$!);
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62
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63 $serializer->Serialize($hFile, $this);
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64 }
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65
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66 sub xml {
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67 my $this = shift;
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68 my $serializer = new IMPL::Serializer(
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69 Formatter => new IMPL::Serialization::XmlFormatter(
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70 IdentOutput => 1,
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71 SkipWhitespace => 1
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72 )
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73 );
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74 my $str = '';
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75 open my $hFile,'>',\$str or die new IMPL::Exception("Failed to open stream",$!);
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76
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77 $serializer->Serialize($hFile, $this);
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78
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79 undef $hFile;
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80
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81 return $str;
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82 }
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83
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84 sub save {
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85 my ($this,$ctx) = @_;
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86
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87 my $val;
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88
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89 $val = $this->rawGet($_) and $ctx->AddVar($_ => $val) foreach map $_->Name, $this->get_meta(
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90 'IMPL::Class::PropertyInfo',
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91 sub {
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92 $_->Access == IMPL::Class::Member::MOD_PUBLIC and
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93 $_->canGet;
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94 },
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95 1);
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96 }
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97
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98 sub spawn {
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99 my ($this,$file) = @_;
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100 unless ($file) {
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101 ($file = ref $this || $this) =~ s/:+/./g;
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102 $file .= ".xml";
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103 }
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104 return $this->LoadXMLFile( File::Spec->catfile($ConfigBase,$file) );
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105 }
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106
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107 sub get {
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108 my $this = shift;
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109
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110 if (@_ == 1) {
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111 my $obj = $this->SUPER::get(@_);
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112 return UNIVERSAL::isa($obj,'IMPL::Config::Activator') ? $obj->activate : $obj;
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113 } else {
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114 my @objs = $this->SUPER::get(@_);
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115 return map UNIVERSAL::isa($_,'IMPL::Config::Activator') ? $_->activate : $_, @objs ;
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116 }
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117 }
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118
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119 sub rawGet {
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120 my $this = shift;
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121 return $this->SUPER::get(@_);
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122 }
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123
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124 sub Exists {
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125 $_[0]->SUPER::get($_[1]) ? 1 : 0;
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126 }
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127
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128 sub AppBase {
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129 shift;
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130 File::Spec->catdir($AppBase,@_);
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131 }
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132
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133 sub ConfigBase {
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134 shift;
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135 File::Spec->catdir($ConfigBase,@_);
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136 }
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137
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138 1;
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139 __END__
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140
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141 =pod
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142
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143 =head1 NAME
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144
180
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145 C<IMPL::Config> - базовый класс для настраиваемого приложения.
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146
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147 =head1 SYNOPSIS
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148
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149 =begin code
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150
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151 # define application
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152
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153 package MyApp;
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154 use parent qw(IMPL::Config);
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155
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156 use IMPL::Class::Property;
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157 use IMPL::Config::Class;
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158
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159 BEGIN {
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160 public property SimpleString => prop_all;
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161 public property DataSource => prop_all;
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162 }
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163
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164 sub CTOR {
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165 my $this = shift;
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166
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167 $this->DataSource(
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168 new IMPL::Config::Activator(
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169 factory => 'MyDataSource',
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170 parameters=>{
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171 host => 'localhost',
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172 user => 'dbuser'
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173 }
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174 )
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175 ) unless $this->Exists('DataSource');
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176 }
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177
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178 # using application object
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179
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180 my $app = spawn MyApp('default.xml');
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181
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182 $app->Run();
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183
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184 =end code
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185
180
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186 Ниже приведен пример файла C<default.xml> содержащего настройки приложения
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187
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188 =begin code xml
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189
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190 <app type='MyApp'>
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191 <SimpleString>The application</SimpleString>
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192 <DataSource type='IMPL::Config::Activator'>
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193 <factory>MyDataSourceClass</factory>
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194 <parameters type='HASH'>
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195 <host>localhost</host>
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196 <user>dbuser</user>
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197 </parameters>
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198 </DataSource>
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199 </app>
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200
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201 =end code xml
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202
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203 =head1 DESCRIPTION
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204
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205 C<[Serializable]>
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206
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207 C<[Autofill]>
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208
165
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209 C<use parent IMPL::Object::Accessor>
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210
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211 Базовый класс для приложений. Использует подход, что приложение
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212 является объектом, состояние которого предтавляет собой конфигурацию,
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213 а методы - логику.
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214
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215 Данный класс реализует функционал десериализации (и сериализации) экземпляра
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216 приложения из XML документа. Для этого используется механизм C<IMPL::Serialization>.
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217 При этом используются опции C<IMPL::Serialization::XmlFormatter> C<IdentOutput> и
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218 C<SkipWhitespace> для записи документа в легко читаемом виде.
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219
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220 Поскольку в результате восстановления приложения восстанавливаются все элементы
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221 из файла конфигурации, то это может потребовать значительных ресурсов для
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222 создания частей, которые могут никогда не понадобиться. Например, не требуется инициализация
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223 источника данных для передачи пользователю статических данных, сохраненных на диске.
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224
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225 Для решения этой проблемы используются специальные объекты C<IMPL::Config::Activator>.
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226
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227 Если у приложения описано свойство, в котором хранится C<IMPL::Config::Activator>, то
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228 при первом обращении к такому свойству, будет создан объект вызовом метода
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229 C<< IMPL::Config::Activator->activate() >> и возвращен как значение этого свойства.
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230 Таким образом реализуется прозрачная отложенная активация объектов, что позволяет
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231 экономить ресурсы.
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232
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233 =head1 MEMBERS
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234
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235 =over
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236
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237 =item C<[static] LoadXMLFile($fileName) >
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238
180
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239 Создает из XML файла C<$fileName> экземпляр приложения
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240
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241 =item C<SaveXMLFile($fileName)>
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242
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243 Сохраняет приложение в файл C<$fileName>
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244
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245 =item C<[get] xml >
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246
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247 Сохраняет конфигурацию приложения в XML строку.
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248
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249 =item C<[static,operator] spawn($file)>
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250
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251 Синоним для C<LoadXMLFile>, предполагается использование как оператора.
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252
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253 =item C<rawGet($propname,...)>
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254
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255 Метод для получения значений свойств приложения. Данный метод позволяет избежать
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256 использование активации объектов через C<IMPL::Config::Activator>.
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257
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258 =back
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259
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260 =cut