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Enterprise Library深入解析与灵活应用（1）：通过Unity Extension实现和Policy Injection Application Block的集成
1: namespace Artech.PolicyInjectionIntegratedInUnity
2: {
3: public class PolicyInjectionStrategy : EnterpriseLibraryBuilderStrategy
4: {
5: public override void PreBuildUp(IBuilderContext context)
6: {
7: base.PreBuildUp(context);
8: if (context.Policies.Get<IPolicyInjectionPolicy>(context.BuildKey) == null)
9: {
10: context.Policies.Set<IPolicyInjectionPolicy>(new PolicyInjectionPolicy(true), context.BuildKey);
11: }
12: }
13:
14: public override void PostBuildUp(IBuilderContext context)
15: {
16: base.PostBuildUp(context);
17: IPolicyInjectionPolicy policy = context.Policies.Get<IPolicyInjectionPolicy>(context.BuildKey);
18: if ((policy != null) && policy.ApplyPolicies)
19: {
20: policy.SetPolicyConfigurationSource(EnterpriseLibraryBuilderStrategy.GetConfigurationSource(context));
21: context.Existing = policy.ApplyProxy(context.Existing, BuildKey.GetType(context.OriginalBuildKey));
22: }
23: }
24: }
25: }
26:
27:
注：PolicyInjectionPolicy定了在Microsoft.Practices.EnterpriseLibrary.PolicyInjection dll中，实现了Microsoft.Practices.EnterpriseLibrary.PolicyInjection.ObjectBuilder.IPolicyInjectionPolicy和Microsoft.Practices.ObjectBuilder2.IBuilderPolicy。其ApplyProxy方法实际上就是调用了PolicyInjecctor的Wrap方法。
1: namespace Artech.PolicyInjectionIntegratedInUnity
2: {
3: public class PolicyInjectionExtension : UnityContainerExtension
4: {
5: protected override void Initialize()
6: {
7: base.Context.Strategies.AddNew<PolicyInjectionStrategy>(UnityBuildStage.Initialization);
8: }
9: }
10: }
11:
1: public interface ITimeService
2: {
3: DateTime GetSystemTime();
4: }
5:
6: [CachingCallHandler]
7: public class TimeService : ITimeService
8: {
9: #region IContract Members
10:
11: public DateTime GetSystemTime()
12: {
13: return DateTime.Now;
14: }
15:
16: #endregion
17: }
18: }
19:
1: namespace Artech.PolicyInjectionIntegratedInUnity
2: {
3: class Program
4: {
5: static void Main(string[] args)
6: {
7: IUnityContainer container = new UnityContainer();
8: container.AddExtension(new PolicyInjectionExtension());
9: container.RegisterType<ITimeService, TimeService>();
10: ITimeService instance = container.Resolve<ITimeService>();
11: for (int i = 0; i < 10; i++)
12: {
13: Console.WriteLine(instance.GetSystemTime());
14: Thread.Sleep(1000);
15: }
16: }
17: }
18: }
19:
1: <?xml version="1.0" encoding="utf-8"?>
2: <configuration>
3: <configSections>
4: <section name="unity" type="Microsoft.Practices.Unity.Configuration.UnityConfigurationSection,Microsoft.Practices.Unity.Configuration, Version=1.1.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
5: </configSections>
6: <unity>
7: <containers>
8: <container>
9: <types>
10: <type type="Artech.PolicyInjectionIntegratedInUnity.ITimeService,Artech.PolicyInjectionIntegratedInUnity" mapTo="Artech.PolicyInjectionIntegratedInUnity.TimeService,Artech.PolicyInjectionIntegratedInUnity"/>
11: </types>
12: <extensions>
13: <add type="Artech.PolicyInjectionIntegratedInUnity.PolicyInjectionExtension,Artech.PolicyInjectionIntegratedInUnity" />
14: </extensions>
15: </container>
16: </containers>
17: </unity>
18: </configuration>
19:
1: namespace Artech.PolicyInjectionIntegratedInUnity
2: {
3: class Program
4: {
5: static void Main(string[] args)
6: {
7: IUnityContainer container = new UnityContainer();
8: UnityConfigurationSection unityConfigSection = ConfigurationManager.GetSection("unity") as UnityConfigurationSection;
9: unityConfigSection.Containers.Default.Configure(container);
10: ITimeService instance = container.Resolve<ITimeService>();
11: for (int i = 0; i < 10; i++)
12: {
13: Console.WriteLine(instance.GetSystemTime());
14: Thread.Sleep(1000);
15: }
16: }
17: }
18: }
19:
Enterprise Library深入解析与灵活应用:
[1] 通过Unity Extension实现和Policy Injection Application Block的集成
[2] 通过SqlDependency实现Cache和Database的同步
[3] 倘若将Unity、PIAB、Exception Handling引入MVP模式
[4] 创建一个自定义Exception Handler改变ELAB的异常处理机制
[5] 创建一个简易版的批处理执行器，认识Enterprise Library典型的配置方式和对象创建方式
[6] 自己动手创建迷你版AOP框架
[7] 再谈PIAB与Unity之间的集成
作者：蒋金楠
微信公众账号：大内老A
微博：www.weibo.com/artech
如果你想及时得到个人撰写文章以及着作的消息推送，或者想看看个人推荐的技术资料，可以扫描左边二维码（或者长按识别二维码）关注个人公众号（原来公众帐号蒋金楠的自媒体将会停用）。
本文版权归作者和博客园共有，欢迎转载，但未经作者同意必须保留此段声明，且在文章页面明显位置给出原文连接，否则保留追究法律责任的权利。
微信公众账号：大内老A
微博：www.weibo.com/artech
如果你想及时得到个人撰写文章以及着作的消息推送，或者想看看个人推荐的技术资料，可以扫描左边二维码（或者长按识别二维码）关注个人公众号（原来公众帐号蒋金楠的自媒体将会停用）。
本文版权归作者和博客园共有，欢迎转载，但未经作者同意必须保留此段声明，且在文章页面明显位置给出原文连接，否则保留追究法律责任的权利。
最后更新：2017-10-30 17:04:30