/*
 * Copyright 1999 by dreamBean Software,
 * All rights reserved.
 */
package smartproxy.proxies;

import java.lang.reflect.Method;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.InvocationTargetException;
import java.rmi.Remote;
import java.rmi.RemoteException;

/**
 *    This is a smart proxy wrapper that checks performance. 
 *    Since it uses System.currentTimeMillis this will not show any meaningful
 *    results on short calls, since the Java timer is not granular enough.
 *     
 *    Note that it is not tightly bound to the remote object interface,
 *    and can therefore be reused with any remote object(!)
 *
 *   @author Rickard 謆erg (rickard@dreambean.com)
 *   @version $Revision:$
 */
public class PerformanceProxy
   implements InvocationHandler, java.io.Serializable, LinkedProxy
{
   Object next;

   // Constructors --------------------------------------------------
   public PerformanceProxy(Object next)
   {
      this.next = next;
   }
   
   // Public --------------------------------------------------------
   public Object invoke(Object proxy,
                        Method method,
                        Object[] args)
      throws Throwable
   {
      // Time call
      long start = System.currentTimeMillis();
      try
      {
         return method.invoke(next, args);
      } catch (InvocationTargetException e)
      {
         throw e.getTargetException();
      } finally
      {
         long end = System.currentTimeMillis();
         System.out.println(method.getDeclaringClass().getName()+"."+method.getName()+":"+(end - start) +"ms");
      }
   }
   
   public Object getNext()
   {
      return next;
   }
   
   public void setNext(Object next)
   {
      this.next = next;
   }
}