logproxy.java

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/*
 * 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 logs calls
 *     
 *    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 ([e-mail])
 *   @version $Revision:$
 */
public class LogProxy
   implements InvocationHandler, java.io.Serializable, LinkedProxy
{
   Object next;

   // Constructors --------------------------------------------------
   public LogProxy(Object next)
   {
      this.next = next;
   }
   
   // Public --------------------------------------------------------
   public Object invoke(Object proxy,
                        Method method,
                        Object[] args)
      throws Throwable
   {
      // Log call
      String log = method.getDeclaringClass().getName()+"."+method.getName()+"(";
      for (int i = 0; i < args.length; i++)
      {
         log += (i>0?",":"")+args[i].toString();
      }
      log += ")";
      System.out.println(log);
      
      try
      {
         return method.invoke(next, args);
      } catch (InvocationTargetException e)
      {
         throw e.getTargetException();
      }
   }
   
   public Object getNext()
   {
      return next;
   }
   
   public void setNext(Object next)
   {
      this.next = next;
   }
}