动态代理的5模式使用示例和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，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);
                }
            }