Castle Windsor 學習-----Installer的幾種安裝方式

翻譯

　　當使用依賴注入容器時，你首先要向容器中注冊你的組件，Windsor使用installers（該類型實現IWindsorInstaller接口）來封裝和隔離注冊的邏輯，可以使用Configuration和FromAssembly來完成工作。

　　Installers是實現了IWindsorInstaller接口的簡單類型，只有一個Install方法，該方法接收container參數，該參數使用 fluent registration API方式來注冊組件

　　

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));
   }
}

備注：使用單獨的installer來注冊一些相關的服務信息（如repositories、controllers）

installer必須是公共的而且包含一個公共的默認構造函數，Windsor使用InstallerFactory掃描公開的installers

 

使用installers

 

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

 

當有新的intallers，要記得在這里注冊

如果installers過多，添加這些代碼有點乏味。Windsor提供FromAssembly靜態類和Configuration來進行外部的配置

FromAssembly靜態類會掃描指定的程序集中所有實現IWindsorInstaller接口的類，如果添加新的installer，則不用添加額外代碼，Windsor會自動檢測到類型並實例化

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

 

installer的注冊沒有特定的順序，所以你不知道哪個installer先被注冊，如果要進行特殊的排序，使用InstallerFactory來實現

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 = 100;

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


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

 

給installer添加特性進行排序

 

1. FromAssembly.This() 調用該方法的程序集
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，要使用絕對路徑
3. FromAssembly.Containing 
   程序集中包含特定的類型

 

Configuration 類

讀取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自動獲取xml文件中的installers

也可以寫在應用程序配置文件中

<?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"/>

      <!--查找該程序集下所有IWindsorInstaller接口的類型進行注冊-->
      <!--<install assembly="WindsorInstaller"></install>-->

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