package proxy;import java.lang.reflect.InvocationHandler;import java.lang.reflect.InvocationTargetException;import java.lang.reflect.Method;import java.lang.reflect.Proxy;public class ProxyDemo {	public static void main(String[] args) {		ILoadData mysqlHandler = new LoadDataToMysql();		ILoadData handler = LoadDataHandler.newInstance(mysqlHandler, new DataMetrics());		handler.loadData("load data");	}	}class LoadDataHandler  {	public static ILoadData newInstance(ILoadData handler, DataMetrics metrics) {		return (ILoadData) Proxy.newProxyInstance(handler.getClass()				.getClassLoader(), new Class[] { ILoadData.class },				new DataMetricsProxy(handler, metrics));	}	private static class DataMetricsProxy implements InvocationHandler {		private final ILoadData handler;		private final DataMetrics metrics;		private DataMetricsProxy(ILoadData handler, DataMetrics metrics) {			this.handler = handler;			this.metrics = metrics;		}		@Override		public Object invoke(Object proxy, Method m, Object[] args)				throws Throwable {			Object result;			try {				long start = now();				result = m.invoke(handler, args);				int processTime = (int) (now() - start);				metrics.incMethodTime(m.getName(), processTime);			} catch (InvocationTargetException e) {				throw e.getTargetException();			} catch (Exception e) {				throw new RuntimeException("unexpected invocation exception: "						+ e.getMessage());			}			return result;		}	}	private static long now() {		return System.nanoTime();	}}interface ILoadData {	public void loadData(String data);}class LoadDataToMysql implements ILoadData {	@Override	public void loadData(String data) {		System.out.println("load data to mysql");	}}class DataMetrics {	public void incMethodTime(String name, long time) {		System.out.println(name + "," + time);	}}