dynamicclassloader.java

《精通RMI：Java与EJB企业级应用开发》书籍的源代码. 本书是讲述RMI技术的经典著作

/*
 * Copyright 1999 by dreamBean Software,
 * All rights reserved.
 */
package smartworld.server;

import java.net.URL;
import java.net.URLClassLoader;

import smartproxy.proxies.DynamicRemoteStub;

/**
 *    This is a special classloader that allows dynamic proxies to be used instead 
 *    of generated stub classes.
 *
 *    Load the remote object implementation class with this classloader to make it work.
 *      
 *   @author Rickard 謆erg ([e-mail])
 */
public class DynamicClassLoader
   extends URLClassLoader
{
   // Static --------------------------------------------------------
   static ThreadLocal currentClass = new ThreadLocal();
   
   public static Class getCurrentClass()
   {
      return (Class)currentClass.get();
   }
   
   // Constructors --------------------------------------------------
   public DynamicClassLoader(URL[] urls)
   {
      super(urls);
   }
   
   // Public implementation -----------------------------------------
   protected Class findClass(String name)
      throws ClassNotFoundException
   {
      if (name.endsWith("_Stub"))
      {
         name = name.substring(0,name.length()-5);
         
         // Get impl
         Class cl = loadClass(name);
         currentClass.set(cl.getInterfaces()[0]); // Assume that it only implements one remote interface
         
         return DynamicRemoteStub.class;
      } else
      {
         return super.findClass(name);
      }
   }
}