package com.sun.enterprise.monitor;

import java.lang.reflect.*;

/**
 * dynamic proxy for returning monitoring statistic data types
 * @author Sreenivas Munnangi
 */

public class StatsProxy implements java.lang.reflect.InvocationHandler {

    private Object obj;

    public static Object newInstance(Object obj) {
        return java.lang.reflect.Proxy.newProxyInstance(
            obj.getClass().getClassLoader(),
            obj.getClass().getInterfaces(),
            new StatsProxy(obj));
    }

    private StatsProxy(Object obj) {
        this.obj = obj;
    }

    public Object invoke(Object proxy, Method m, Object[] args) throws Throwable {
        Object result;
        try {
            System.out.println("statsproxy before method " + m.getName());
            result = m.invoke(obj, args);
            System.out.println("result = " + result);
        } catch (InvocationTargetException e) {
            throw e.getTargetException();
        } catch (Exception e) {
            throw new RuntimeException("unexpected invocation exception: " +
                       e.getMessage());
        } finally {
            System.out.println("statsproxy after method " + m.getName());
        }
        return result;
    }
}