设置模式之 -> 代理模式之动态代理实现

package javatuning.ch2.proxy.dynamic;

import javatuning.ch2.proxy.IDBQuery;

public class DBQuery implements IDBQuery{
	public DBQuery(){
		//为了测试代理的调用性能，去掉这里的延时操作
	}
	@Override
	public String request() {
		return "request string";
	}
}

package javatuning.ch2.proxy.dynamic;

import java.lang.reflect.Method;

import javatuning.ch2.proxy.IDBQuery;

import net.sf.cglib.proxy.MethodInterceptor;
import net.sf.cglib.proxy.MethodProxy;

public class CglibDbQueryInterceptor implements MethodInterceptor {
	IDBQuery real=null;
	@Override
	public Object intercept(Object arg0, Method arg1, Object[] arg2,
			MethodProxy arg3) throws Throwable {
		if(real==null)
			real=new DBQuery();
		return real.request();	
	}
}

package javatuning.ch2.proxy.dynamic;

import java.lang.reflect.Method;

import javassist.util.proxy.MethodHandler;
import javatuning.ch2.proxy.IDBQuery;

public class JavassistDynDbQueryHandler implements MethodHandler {
	IDBQuery real=null;
	@Override
	public Object invoke(Object arg0, Method arg1, Method arg2, Object[] arg3)
			throws Throwable {
		if(real==null)
			real=new DBQuery();
		return real.request();	
	}
}

package javatuning.ch2.proxy.dynamic;

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

import javatuning.ch2.proxy.IDBQuery;

public class JdkDbQeuryHandler implements InvocationHandler {
	IDBQuery real=null;
	
	@Override
	public Object invoke(Object proxy, Method method, Object[] args)
			throws Throwable {
		if(real==null)
			real=new DBQuery();
		return real.request();
	}
}

package javatuning.ch2.proxy.dynamic;

import java.lang.reflect.Proxy;

import javassist.ClassPool;
import javassist.CtClass;
import javassist.CtField;
import javassist.CtNewConstructor;
import javassist.CtNewMethod;
import javassist.util.proxy.ProxyFactory;
import javassist.util.proxy.ProxyObject;

import javatuning.ch2.proxy.IDBQuery;


import net.sf.cglib.proxy.Enhancer;

public class FunctionMain {

	/**
	 * @param args
	 * @throws Exception 
	 */
	public static void main(String[] args) throws Exception {
		IDBQuery d=null;
		d=createJdkProxy();
		System.out.println(d.request());
		d=createCglibProxy();
		System.out.println(d.request());
		d=createJavassistDynProxy();
		System.out.println(d.request());
		d=createJavassistBytecodeDynamicProxy();
		System.out.println(d.request());
	}
	
	public static IDBQuery createJdkProxy(){
		IDBQuery jdkProxy = (IDBQuery) Proxy.newProxyInstance(ClassLoader.getSystemClassLoader(),  
	                new Class[] { IDBQuery.class }, new JdkDbQeuryHandler());  
	        return jdkProxy;  
	}
	
	public static IDBQuery createCglibProxy(){
        Enhancer enhancer = new Enhancer();  
        enhancer.setCallback(new CglibDbQueryInterceptor());  
        enhancer.setInterfaces(new Class[] { IDBQuery.class });  
        IDBQuery cglibProxy = (IDBQuery) enhancer.create();  
        return cglibProxy;  
	}

	public static IDBQuery createJavassistDynProxy()  throws Exception {
        ProxyFactory proxyFactory = new ProxyFactory();  
        proxyFactory.setInterfaces(new Class[] { IDBQuery.class });  
        Class proxyClass = proxyFactory.createClass();  
        IDBQuery javassistProxy = (IDBQuery) proxyClass.newInstance();  
        ((ProxyObject) javassistProxy).setHandler(new JavassistDynDbQueryHandler());  
        return javassistProxy;  
	}
	
    public static IDBQuery createJavassistBytecodeDynamicProxy() throws Exception {  
        ClassPool mPool = new ClassPool(true);  
        CtClass mCtc = mPool.makeClass(IDBQuery.class.getName() + "JavaassistBytecodeProxy");
        mCtc.addInterface(mPool.get(IDBQuery.class.getName()));  
        mCtc.addConstructor(CtNewConstructor.defaultConstructor(mCtc));  
        mCtc.addField(CtField.make("public " + IDBQuery.class.getName() + " real;", mCtc)); 
        String dbqueryname=DBQuery.class.getName();
        mCtc.addMethod(CtNewMethod.make("public String request() { if(real==null)real=new "+dbqueryname+"();return real.request(); }", mCtc));  
        Class pc = mCtc.toClass();  
        IDBQuery bytecodeProxy = (IDBQuery) pc.newInstance();
        return bytecodeProxy;  
    } 
    
	
}

package javatuning.ch2.proxy.dynamic;

import java.lang.reflect.Proxy;

import javassist.ClassPool;
import javassist.CtClass;
import javassist.CtField;
import javassist.CtNewConstructor;
import javassist.CtNewMethod;
import javassist.util.proxy.ProxyFactory;
import javassist.util.proxy.ProxyObject;

import javatuning.ch2.proxy.IDBQuery;


import net.sf.cglib.proxy.Enhancer;

public class PerformanceMain {
	public static final int CIRCLE=30000000;
	/**
	 * @param args
	 * @throws Exception 
	 */
	public static void main(String[] args) throws Exception {
		IDBQuery d=null;
		long begin=System.currentTimeMillis();
		d=createJdkProxy();
		System.out.println("createJdkProxy:"+(System.currentTimeMillis()-begin));
		System.out.println("JdkProxy class:"+d.getClass().getName());
		begin=System.currentTimeMillis();
		for(int i=0;i<CIRCLE;i++)
			d.request();
		System.out.println("callJdkProxy:"+(System.currentTimeMillis()-begin));

		begin=System.currentTimeMillis();
		d=createCglibProxy();
		System.out.println("createCglibProxy:"+(System.currentTimeMillis()-begin));
		System.out.println("CglibProxy class:"+d.getClass().getName());
		begin=System.currentTimeMillis();
		for(int i=0;i<CIRCLE;i++)
			d.request();
		System.out.println("callCglibProxy:"+(System.currentTimeMillis()-begin));
		
		begin=System.currentTimeMillis();
		d=createJavassistDynProxy();
		System.out.println("createJavassistDynProxy:"+(System.currentTimeMillis()-begin));
		System.out.println("JavassistDynProxy class:"+d.getClass().getName());
		begin=System.currentTimeMillis();
		for(int i=0;i<CIRCLE;i++)
			d.request();
		System.out.println("callJavassistDynProxy:"+(System.currentTimeMillis()-begin));
		
		begin=System.currentTimeMillis();
		d=createJavassistBytecodeDynamicProxy();
		System.out.println("createJavassistBytecodeDynamicProxy:"+(System.currentTimeMillis()-begin));
		System.out.println("JavassistBytecodeDynamicProxy class:"+d.getClass().getName());
		begin=System.currentTimeMillis();
		for(int i=0;i<CIRCLE;i++)
			d.request();
		System.out.println("callJavassistBytecodeDynamicProxy:"+(System.currentTimeMillis()-begin));
	}
	
	public static IDBQuery createJdkProxy(){
		IDBQuery jdkProxy = (IDBQuery) Proxy.newProxyInstance(
				ClassLoader.getSystemClassLoader(),  
	            new Class[] { IDBQuery.class }, 
	            new JdkDbQeuryHandler());  
	        return jdkProxy;  
	}
	
	public static IDBQuery createCglibProxy(){
        Enhancer enhancer = new Enhancer();  
        enhancer.setCallback(new CglibDbQueryInterceptor());  
        enhancer.setInterfaces(new Class[] { IDBQuery.class });  
        IDBQuery cglibProxy = (IDBQuery) enhancer.create();  
        return cglibProxy;  
	}

	public static IDBQuery createJavassistDynProxy()  throws Exception {
        ProxyFactory proxyFactory = new ProxyFactory();  
        proxyFactory.setInterfaces(new Class[] { IDBQuery.class });  
        Class proxyClass = proxyFactory.createClass();  
        IDBQuery javassistProxy = (IDBQuery) proxyClass.newInstance();  
        ((ProxyObject) javassistProxy).setHandler(new JavassistDynDbQueryHandler());  
        return javassistProxy;  
	}
	
    public static IDBQuery createJavassistBytecodeDynamicProxy() throws Exception {  
        ClassPool mPool = new ClassPool(true);  
        CtClass mCtc = mPool.makeClass(IDBQuery.class.getName() + "JavaassistBytecodeProxy");
        mCtc.addInterface(mPool.get(IDBQuery.class.getName()));  
        mCtc.addConstructor(CtNewConstructor.defaultConstructor(mCtc));  
        mCtc.addField(CtField.make("public " + IDBQuery.class.getName() + " real;", mCtc)); 
        String dbqueryname=DBQuery.class.getName();
        mCtc.addMethod(CtNewMethod.make("public String request() { if(real==null)real=new "+dbqueryname+"();return real.request(); }", mCtc));  
        Class pc = mCtc.toClass();  
        IDBQuery bytecodeProxy = (IDBQuery) pc.newInstance();
        return bytecodeProxy;  
    } 
    
	
}