// reflection/SimpleDynamicProxy.java

// (c)2021 MindView LLC: see Copyright.txt

// We make no guarantees that this code is fit for any purpose.

// Visit http://OnJava8.com for more book information.

import java.lang.reflect.InvocationHandler;

import java.lang.reflect.Method;

import java.lang.reflect.Proxy;

class DynamicProxyHandler implements InvocationHandler {

private Object proxied;

DynamicProxyHandler(Object proxied) {

this.proxied = proxied;

}

@Override

public Object

invoke(Object proxy, Method method, Object[] args)

throws Throwable {

System.out.println(

"**** proxy: " + proxy.getClass() +

", method: " + method + ", args: " + args);

if (args != null)

for (Object arg : args)

System.out.println(" " + arg);

return method.invoke(proxied, args);

}

}

class SimpleDynamicProxy {

public static void consumer(Interface iface) {

iface.doSomething();

iface.somethingElse("bonobo");

}

public static void main(String[] args) {

RealObject real = new RealObject();

consumer(real);

// Insert a proxy and call again:

Interface proxy = (Interface) Proxy.newProxyInstance(

Interface.class.getClassLoader(),

new Class[]{Interface.class},

new DynamicProxyHandler(real));

consumer(proxy);

}

}

/* Output:

doSomething

somethingElse bonobo

**** proxy: class $Proxy0, method: public abstract void

Interface.doSomething(), args: null

doSomething

**** proxy: class $Proxy0, method: public abstract void

Interface.somethingElse(java.lang.String), args:

[Ljava.lang.Object;@1b84c92

bonobo

somethingElse bonobo

*/