DynamicClassLoader.java

package com.wangyin.ak47.common;

import java.net.URL;
import java.net.URLClassLoader;
import java.net.URLStreamHandlerFactory;
import java.util.List;

/**
 * This is a basic URL classloader for loading new resources
 * dynamically.
 *
 * It allows public access to the addURL() method.
 *
 * It also adds a convenience method to update the current thread classloader
 *
 */
public class DynamicClassLoader extends URLClassLoader { 

    public DynamicClassLoader(URL[] urls) {
        super(urls);
    }

    public DynamicClassLoader(URL[] urls, ClassLoader parent) {
        super(urls, parent);
    }

    public DynamicClassLoader(URL[] urls, ClassLoader parent,
            URLStreamHandlerFactory factory) {
        super(urls, parent, factory);
    }

    // Make the addURL method visible
    @Override
    public void addURL(URL url) {
        super.addURL(url);
    }

    /**
     *
     * @param urls - list of URLs to add to the thread's classloader
     */
    public static void updateLoader(List<URL> urls) {
        DynamicClassLoader loader
            = (DynamicClassLoader) Thread.currentThread().getContextClassLoader();
        for(URL url : urls) {
            loader.addURL(url);
        }
    }

    
}