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动态代理的5模式使用示例和Mixin模式

网络编程 2021-07-04 22:40www.168986.cn编程入门

什么叫"动态代理"，代理模式我们都知道，动态代理就是动态生成的代理（采用Emit）。5种代理模式:ClassProxy、ClassProxyWithTarget、InterfaceProxyWithoutTarget、InterfaceProxyWithTarget、InterfaceProxyWithTargetInterface、Mixin模式

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，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，给出一个示例。

代码如下:

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

代码如下:

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

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

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

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

第二种ClassProxyWithTarget

代码如下:

{
                Console.WriteLine("\nClassProxyWithTarget\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 positeField = animal.GetType().GetField("__target");
Console.WriteLine(positeField);

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

第三种InterfaceProxyWithoutTarget

代码如下:

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

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

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

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

第四种InterfaceProxyWithTarget

代码如下:

{
                Console.WriteLine("\nInterfaceProxyWithTarget\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 positeField = animal.GetType().GetField("__target");
Console.WriteLine(positeField);

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

第五种InterfaceProxyWithTargetInterface

代码如下:

{
                Console.WriteLine("\nInterfaceProxyWithTargetInterface\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 positeField = animal.GetType().GetField("__target");
Console.WriteLine(positeField);

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

Mixin模式

代码如下:

{
                Console.WriteLine("\nMixin\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 positeField = animal.GetType().GetField("__target");
Console.WriteLine(positeField);

                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);
                }
            }

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