Castle IOC容器实践之EnterpriseLibrary Configuration Facility
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摘要:EnterpriseLibrary Configuration Facility就好像是在容器和数据类之间的桥,让我们可以轻松得去读取和操作配置文件。熟悉Enterprise Library的人都知道,在Enterprise Library中有一个Configuration Application Block,它可以使我们方便的从各种存储中读写配置信息,通过EnterpriseLibrary Configuration Facility我们就可以像使用普通的组件那样去注册一个数据类,它会用configurationkey来映射到Enterprise Library的配置文件中。
主要内容:
1.概述
2.使用Facility
3.原理浅析
一.概述
EnterpriseLibrary Configuration Facility就好像是在容器和数据类之间的桥,让我们可以轻松得去读取和操作配置文件。熟悉Enterprise Library的人都知道,在Enterprise Library中有一个Configuration Application Block,它可以使我们方便的从各种存储中读写配置信息,通过EnterpriseLibrary Configuration Facility我们就可以像使用普通的组件那样去注册一个数据类,它会用configurationkey来映射到Enterprise Library的配置文件中。先来看一下该Facility的相关信息:
Facility Information
Uses Proxy
No
Requires Configuration
Yes
Uses Attributes
No
Version
Beta 2
二.使用Facility
1.配置文件,这里使用配置文件注册组件的方式,放在应用程序配置文件中,这里唯一需要注意的是configurationkey,这个特性不能写错:
<configuration>
<configSections>
<section name="enterpriselibrary.configurationSettings" type="System.Configuration.IgnoreSectionHandler, System, Version=1.0.5000.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" />
<section name="castle" type="Castle.Windsor.Configuration.AppDomain.CastleSectionHandler, Castle.Windsor" />
</configSections>
<enterpriselibrary.configurationSettings xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
defaultSection="" applicationName="Application" xmlns="http://www.microsoft.com/practices/enterpriselibrary/08-31-2004/configuration">
<configurationSections>
<configurationSection name="EditorSettings" encrypt="false">
<storageProvider xsi:type="XmlFileStorageProviderData" name="XML File Storage Provider" path="../../EditorSettings.config" />
<dataTransformer xsi:type="XmlSerializerTransformerData" name="Xml Serializer Transformer">
<includeTypes />
</dataTransformer>
</configurationSection>
</configurationSections>
<keyAlgorithmStorageProvider xsi:nil="true" />
</enterpriselibrary.configurationSettings>
<castle>
<facilities>
<facility id="configuration" type="Castle.Facilities.EnterpriseLibrary.Configuration.EnterpriseConfigurationFacility, Castle.Facilities.EnterpriseLibrary.Configuration" />
</facilities>
<components>
<component id="editorfontdata" type="ConfigurationQuickStart.EditorFontData, Castle.Facilities.EnterpriseLibrary.Configuration.Tests"
configurationkey="EditorSettings" />
<component id="editorservice" type="Castle.Facilities.EnterpriseLibrary.Configuration.Tests.EditorService, Castle.Facilities.EnterpriseLibrary.Configuration.Tests" />
</components>
</castle>
</configuration>
2.编写数据类文件:
{
private string name;
private float size;
private int style;
public EditorFontData()
{
}
public string Name
{
get{ return name; }
set{ name = value; }
}
public float Size
{
get{ return size; }
set{ size = value; }
}
public int Style
{
get{ return style; }
set{ style = value; }
}
public override string ToString()
{
StringBuilder sb = new StringBuilder();
sb.AppendFormat("Name = {0}; Size = {1}; Style = {2}", name, size.ToString(), style.ToString());
return sb.ToString();
}
}
3.采用XML方式的存储
<EditorSettings>
<xmlSerializerSection type="ConfigurationQuickStart.EditorFontData, Castle.Facilities.EnterpriseLibrary.Configuration.Tests, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null">
<EditorFontData xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<Name>Microsoft Sans Serif</Name>
<Size>9.25</Size>
<Style>0</Style>
</EditorFontData>
</xmlSerializerSection>
</EditorSettings>
4.使用数据类的组件
{
private readonly EditorFontData data;
public EditorService(EditorFontData data)
{
this.data = data;
}
public EditorFontData Data
{
get { return data; }
}
}
5.在容器中使用数据类
public class FacilityTestCase
{
[Test]
public void LoadingConfig()
{
IWindsorContainer container = new WindsorContainer( new XmlInterpreter(new AppDomainConfigSource()) );
EditorService service = (EditorService) container[ typeof(EditorService) ];
Assert.AreEqual("Microsoft Sans Serif", service.Data.Name);
Assert.AreEqual(9.25,service.Data.Size);
}
}
可以看到,使用EnterpriseLibrary Configuration Facility非常的简单。最后还要注意一点,使用这个Facility需要安装Enterprise Library,因为它依赖于:
Microsoft.Practices.EnterpriseLibrary.Configuration.dll
三.原理分析
下面对这个Facility的原理做一下简单的分析。在初始化的时候,它注册了一个名为EntLibConfigurationInspector的分发器
{
protected override void Init()
{
Kernel.ComponentModelBuilder.AddContributor( new EntLibConfigurationInspector() );
}
}
internal class EntLibConfigurationInspector : IContributeComponentModelConstruction
{
public void ProcessModel(IKernel kernel, ComponentModel model)
{
if (model.Configuration == null) return;
String configKey = model.Configuration.Attributes["configurationkey"];
if (configKey == null) return;
model.ExtendedProperties["configurationkey"] = configKey;
model.CustomComponentActivator = typeof(EntLibComponentActivator);
}
}
在EntLibConfigurationInspector中为ComponentModel注册一个CustomComponentActivator类型的Activator,这个CustomComponentActivator的实现为EntLibComponentActivator。
{
public EntLibComponentActivator(ComponentModel model, IKernel kernel,
ComponentInstanceDelegate onCreation, ComponentInstanceDelegate onDestruction) : base(model, kernel, onCreation, onDestruction)
{
}
protected override object InternalCreate()
{
String configKey = (String) Model.ExtendedProperties["configurationkey"];
return ConfigurationManager.GetConfiguration(configKey);
}
protected override void InternalDestroy(object instance)
{
String configKey = (String) Model.ExtendedProperties["configurationkey"];
ConfigurationManager.WriteConfiguration(configKey, instance);
}
}
好了,关于EnterpriseLibrary Configuration Facility就简单的介绍到这里。
更多Castle文章可以访问:《Castle 开发系列文章》
参考资料
Castle的官方网站http://www.castleproject.org
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