54 lines
1.5 KiB
Java
54 lines
1.5 KiB
Java
// typeinfo/SimpleDynamicProxy.java
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// (c)2020 MindView LLC: see Copyright.txt
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// We make no guarantees that this code is fit for any purpose.
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// Visit http://OnJava8.com for more book information.
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import java.lang.reflect.*;
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class DynamicProxyHandler implements InvocationHandler {
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private Object proxied;
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DynamicProxyHandler(Object proxied) {
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this.proxied = proxied;
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}
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@Override
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public Object
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invoke(Object proxy, Method method, Object[] args)
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throws Throwable {
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System.out.println(
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"**** proxy: " + proxy.getClass() +
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", method: " + method + ", args: " + args);
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if(args != null)
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for(Object arg : args)
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System.out.println(" " + arg);
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return method.invoke(proxied, args);
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}
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}
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class SimpleDynamicProxy {
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public static void consumer(Interface iface) {
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iface.doSomething();
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iface.somethingElse("bonobo");
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}
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public static void main(String[] args) {
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RealObject real = new RealObject();
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consumer(real);
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// Insert a proxy and call again:
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Interface proxy = (Interface)Proxy.newProxyInstance(
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Interface.class.getClassLoader(),
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new Class[]{ Interface.class },
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new DynamicProxyHandler(real));
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consumer(proxy);
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}
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}
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/* Output:
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doSomething
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somethingElse bonobo
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**** proxy: class $Proxy0, method: public abstract void
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Interface.doSomething(), args: null
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doSomething
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**** proxy: class $Proxy0, method: public abstract void
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Interface.somethingElse(java.lang.String), args:
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[Ljava.lang.Object;@6bc7c054
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bonobo
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somethingElse bonobo
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*/
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