Castle Windsor 学习-----Installer的几种安装方式

翻译

　　当使用依赖注入容器时，你首先要向容器中注册你的组件，Windsor使用installers（该类型实现IWindsorInstaller接口）来封装和隔离注册的逻辑，可以使用Configuration和FromAssembly来完成工作。

　　Installers是实现了IWindsorInstaller接口的简单类型，只有一个Install方法，该方法接收container参数，该参数使用 fluent registration API方式来注册组件

　　

public class RepositoriesInstaller : IWindsorInstaller
{
   public void Install(IWindsorContainer container, IConfigurationStore store)
   {
      container.Register(AllTypes.FromAssemblyNamed("Acme.Crm.Data")
                            .Where(type => type.Name.EndsWith("Repository"))
                            .WithService.DefaultInterfaces()
                            .Configure(c => c.LifeStyle.PerWebRequest));
   }
}

备注：使用单独的installer来注册一些相关的服务信息（如repositories、controllers）

installer必须是公共的而且包含一个公共的默认构造函数，Windsor使用InstallerFactory扫描公开的installers

使用installers

var container = new WindsorContainer();
container.Install(
   new ControllersInstaller(),
   new RepositoriesInstaller(),
   // and all your other installers
);

当有新的intallers，要记得在这里注册

如果installers过多，添加这些代码有点乏味。Windsor提供FromAssembly静态类和Configuration来进行外部的配置

FromAssembly静态类会扫描指定的程序集中所有实现IWindsorInstaller接口的类，如果添加新的installer，则不用添加额外代码，Windsor会自动检测到类型并实例化

container.Install(
   FromAssembly.This(),
   FromAssembly.Named("Acme.Crm.Bootstrap"),
   FromAssembly.Containing<ServicesInstaller>(),
   FromAssembly.InDirectory(new AssemblyFilter("Extensions")),
   FromAssembly.Instance(this.GetPluginAssembly())
);

installer的注册没有特定的顺序，所以你不知道哪个installer先被注册，如果要进行特殊的排序，使用InstallerFactory来实现

public class WindsorBootstrap : InstallerFactory
    {

        public override IEnumerable<Type> Select(IEnumerable<Type> installerTypes)
        {
            var retval =  installerTypes.OrderBy(x => this.GetPriority(x));
            return retval;
        }

        private int GetPriority(Type type)
        {
            var attribute = type.GetCustomAttributes(typeof(InstallerPriorityAttribute), false).FirstOrDefault() as InstallerPriorityAttribute;
            return attribute != null ? attribute.Priority : InstallerPriorityAttribute.DefaultPriority;
        }

    }

[AttributeUsage(AttributeTargets.Class)]
    public sealed class InstallerPriorityAttribute : Attribute
    {
        public const int DefaultPriority = ;

        public int Priority { get; private set; }
        public InstallerPriorityAttribute(int priority)
        {
            this.Priority = priority;
        }
    }

container.Install(FromAssembly.This(new WindsorBootstrap()));

给installer添加特性进行排序

1. FromAssembly.This() 调用该方法的程序集
2. FromAssembly.Named("Acme.Crm.Bootstrap")
   Install from assembly with specified assembly name using standard .NET assembly locating mechanism. 
　 You can also provide path to a .dll or .exe file when you have the assembly in some non-standard location.
   如果是.dll，要使用绝对路径
3. FromAssembly.Containing 
   程序集中包含特定的类型

Configuration 类

读取xml文件的配置信息

container.Install(
   Configuration.FromAppConfig(),
   Configuration.FromXmlFile("settings.xml"),
   Configuration.FromXml(new AssemblyResource("assembly://Acme.Crm.Data/Configuration/services.xml"))
);

settings.xml文件格式如下

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
  <installers>
    <install type="WindsorInstaller.CustomerInstaller,WindsorInstaller"/>
    <install type="WindsorInstaller.SecondInstaller,WindsorInstaller"/>
  </installers>
</configuration>

Windsor自动获取xml文件中的installers

也可以写在应用程序配置文件中

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
  <configSections>
    <section name="castle" type="Castle.Windsor.Configuration.AppDomain.CastleSectionHandler, Castle.Windsor" />
  </configSections>
  <castle>
    <installers>
      <install type="WindsorInstaller.CustomerInstaller,WindsorInstaller"/>
      <install type="WindsorInstaller.SecondInstaller,WindsorInstaller"/>

      <!--查找该程序集下所有IWindsorInstaller接口的类型进行注册-->
      <!--<install assembly="WindsorInstaller"></install>-->

      <!--查找dll文件-->
      <!--<install directory="Extensions" fileMask="*.dll"></install>-->
    </installers>
  </castle>
</configuration>