package com.DynamicProxy3;

/**
 * 动态代理: 抽象角色(公共接口)
 * 
 * @author DW
 *
 */
public interface DoSomething
{	
	public void working(String work);
}

package com.DynamicProxy3;

/**
 * 动态代理: 真实角色
 * 
 * @author DW
 *
 */
public class Man implements DoSomething
{
	private String name;
	
	public Man(String name)
	{
		this.name = name;
	}
	
	@Override
	public void working(String work)
	{
		System.out.println(this.name + "在" + work);
	}
}

package com.DynamicProxy3;


/**
 * 动态代理: 真实角色
 * 
 * @author DW
 *
 */
public class Woman implements DoSomething
{
	private String name;

	public Woman(String name)
	{
		this.name = name;
	}
	
	@Override
	public void working(String work)
	{
		System.out.println(this.name + "在" + work);
	}
}

package com.DynamicProxy3;

import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;

/**
 * 动态代理: 代理角色
 * 
 * @author DW
 *
 */
public class People implements InvocationHandler
{
	private Object object;
	
	public People(Object object)
	{
		this.object = object;
	}
	
	/**
	 * 动态接受不同的真实角色对象
	 * @param object
	 */
	public void setObject(Object object)
	{
		this.object = object;
	}
	
	public static Object factory(Object object)
	{
		InvocationHandler handler = new People(object);
		
		// 动态生成一个代理
		return  Proxy.newProxyInstance(object.getClass().getClassLoader(),	// 真实对象的类加载器
										object.getClass().getInterfaces(),	// 真实对象实现的所有接口(数组)
										handler	// 代理对象, 
										);
	}
	
	/**
	 * 代理角色类实现了InvocationHandler接口的invoke方法, 当factory方法每次调用后, 都动态生成一个代理实例, 
	 * 当该代理实例引用在外部调用working()方法时, 实际都是在调用本方法; 并通过java底层传参利用反射机制, 将该代
	 * 理角色接收的真实角色的working方法通过参数2传递进来, working方法的参数则通过参数3传递进来...
	 * 
	 */
	@Override
	public Object invoke(Object proxy, Method method, Object[] args) throws Throwable
	{
		// 实际形态:handler引用指向的代理角色对象接受的真实用户的working方法
		return method.invoke(this.object, args);
	}
	
}

package com.DynamicProxy3;

/**
 * 动态代理: 测试
 * 
 * @author DW
 *
 */
public class DynamicProxyTest
{
	public static void main(String[] args)
	{
		DoSomething doSomething = (DoSomething)People.factory(new Man("张三"));
		doSomething.working("狩猎"); // 张三在狩猎
		
		doSomething = (DoSomething)People.factory(new Man("李四"));
		doSomething.working("劈柴");	// 李四在劈柴
		
		doSomething = (DoSomething)People.factory(new Woman("翠花"));
		doSomething.working("做酸菜"); //	 翠花在做酸菜
	}
}