动态代理的5模式使用示例和Mixin模式

好代码
我是人们烈日炎炎口中的一滴水；我是水桶里的一注清泉；我是大海里的一阵水花。有人喜欢茫茫的大雪，有人喜欢如丝的细雨，可是我喜欢那迷人的雾。

重量级的ORM和IOC产品离不开动态代理，作为开发人员，多数情况不用关注动态代理的内部实现机制，但是了解其一般的规律和模式还是有必要的，比如：虽然你开发期间采用了POCO，因为开启了动态代理，运行期间则不是POCO。本文简单描述了5种代理生成模式和1种Mixin模式，最后给出一个示例。


public interface IPlayable
 {
 void Play();
 }


 public class Animal : IPlayable
 {
 public virtual void Play()
 {
 Console.WriteLine("Animal.Play");
 }
 }


 public class Dog : Animal
 {
 public override void Play()
 {
 Console.WriteLine("Dog.Play");
 }
 }


 public interface IRunable
 {
 void Run();
 }


 public class RunAbility : IRunable
 {
 public void Run()
 {
 Console.WriteLine("RunAbility.Run");
 }
 }


 public class AnimalInterceptor : IInterceptor
 {
 public void Intercept(IInvocation invocation)
 {
 Console.WriteLine("Before AnimalInterceptor.Intercept");
 if (invocation.InvocationTarget != null)
 {
 invocation.Proceed();
 }
 Console.WriteLine("After AnimalInterceptor.Intercept");
 }
 }

第一种：ClassProxy


{
 Console.WriteLine("\n*************ClassProxy*************\n");
 var generator = new ProxyGenerator();
 var animal = generator.CreateClassProxy<Animal>(new AnimalInterceptor());
 animal.Play();


 Console.WriteLine(animal.GetType());
 Console.WriteLine(animal.GetType().BaseType);


 var compositeField = animal.GetType().GetField("__target");
 Console.WriteLine(compositeField);


 foreach (var interfaceType in animal.GetType().GetInterfaces())
 {
 Console.WriteLine(interfaceType);
 }
 }

第二种：ClassProxyWithTarget


{
 Console.WriteLine("\n*************ClassProxyWithTarget*************\n");
 var generator = new ProxyGenerator();
 var animal = generator.CreateClassProxyWithTarget<Animal>(new Dog(), new AnimalInterceptor());
 animal.Play();


 Console.WriteLine(animal.GetType());
 Console.WriteLine(animal.GetType().BaseType);


 var compositeField = animal.GetType().GetField("__target");
 Console.WriteLine(compositeField);


 foreach (var interfaceType in animal.GetType().GetInterfaces())
 {
 Console.WriteLine(interfaceType);
 }
 }

第三种：InterfaceProxyWithoutTarget


{
 Console.WriteLine("\n*************InterfaceProxyWithoutTarget*************\n");
 var generator = new ProxyGenerator();
 var animal = generator.CreateInterfaceProxyWithoutTarget<IPlayable>(new AnimalInterceptor());
 animal.Play();


 Console.WriteLine(animal.GetType());
 Console.WriteLine(animal.GetType().BaseType);


 var compositeField = animal.GetType().GetField("__target");
 Console.WriteLine(compositeField);


 foreach (var interfaceType in animal.GetType().GetInterfaces())
 {
 Console.WriteLine(interfaceType);
 }
 }

第四种：InterfaceProxyWithTarget


{
 Console.WriteLine("\n*************InterfaceProxyWithTarget*************\n");
 var generator = new ProxyGenerator();
 var animal = generator.CreateInterfaceProxyWithTarget<IPlayable>(new Dog(), new AnimalInterceptor());
 animal.Play();


 Console.WriteLine(animal.GetType());
 Console.WriteLine(animal.GetType().BaseType);


 var compositeField = animal.GetType().GetField("__target");
 Console.WriteLine(compositeField);


 foreach (var interfaceType in animal.GetType().GetInterfaces())
 {
 Console.WriteLine(interfaceType);
 }
 }

第五种：InterfaceProxyWithTargetInterface


{
 Console.WriteLine("\n*************InterfaceProxyWithTargetInterface*************\n");
 var generator = new ProxyGenerator();
 var animal = generator.CreateInterfaceProxyWithTargetInterface<IPlayable>(new Dog(), new AnimalInterceptor());
 animal.Play();


 Console.WriteLine(animal.GetType());
 Console.WriteLine(animal.GetType().BaseType);


 var compositeField = animal.GetType().GetField("__target");
 Console.WriteLine(compositeField);


 foreach (var interfaceType in animal.GetType().GetInterfaces())
 {
 Console.WriteLine(interfaceType);
 }
 }

Mixin模式


{
 Console.WriteLine("\n*************Mixin*************\n");
 var generator = new ProxyGenerator();
 var options = new ProxyGenerationOptions();
 options.AddMixinInstance(new RunAbility());
 var animal = generator.CreateClassProxy<Animal>(options, new AnimalInterceptor());
 animal.Play();
 (animal as IRunable).Run();


 Console.WriteLine(animal.GetType());
 Console.WriteLine(animal.GetType().BaseType);


 var compositeField = animal.GetType().GetField("__target");
 Console.WriteLine(compositeField);


 foreach (var field in animal.GetType().GetFields())
 {
 if (field.Name.StartsWith("__mixin"))
 {
 Console.WriteLine(field);
 }
 }


 foreach (var interfaceType in animal.GetType().GetInterfaces())
 {
 Console.WriteLine(interfaceType);
 }
 }


到此这篇关于动态代理的5模式使用示例和Mixin模式就介绍到这了。人生像攀登一座山，而找寻出路，却是一种学习的过程。更多相关动态代理的5模式使用示例和Mixin模式内容请查看相关栏目，小编编辑不易，再次感谢大家的支持！