Glassfish example source code file (ExtensibleClassLoader.java)

This example Glassfish source code file (ExtensibleClassLoader.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Glassfish tags/keywords

added, added, cannot, classloader, extensibleclassloader, extensibleclassloader, file, file, io, list, log, logger, logger, logging, malformedurlexception, net, network, repositorychangelistener, urlclassloader, util

The Glassfish ExtensibleClassLoader.java source code

/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 1997-2010 Oracle and/or its affiliates. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at packager/legal/LICENSE.txt.
 *
 * GPL Classpath Exception:
 * Oracle designates this particular file as subject to the "Classpath"
 * exception as provided by Oracle in the GPL Version 2 section of the License
 * file that accompanied this code.
 *
 * Modifications:
 * If applicable, add the following below the License Header, with the fields
 * enclosed by brackets [] replaced by your own identifying information:
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 * If you wish your version of this file to be governed by only the CDDL or
 * only the GPL Version 2, indicate your decision by adding "[Contributor]
 * elects to include this software in this distribution under the [CDDL or GPL
 * Version 2] license."  If you don't indicate a single choice of license, a
 * recipient has the option to distribute your version of this file under
 * either the CDDL, the GPL Version 2 or to extend the choice of license to
 * its licensees as provided above.  However, if you add GPL Version 2 code
 * and therefore, elected the GPL Version 2 license, then the option applies
 * only if the new code is made subject to such option by the copyright
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 */

package com.sun.enterprise.glassfish.bootstrap;

import com.sun.enterprise.module.ModuleDefinition;
import com.sun.enterprise.module.Repository;
import com.sun.enterprise.module.RepositoryChangeListener;

import java.net.MalformedURLException;
import java.net.URI;
import java.net.URL;
import java.net.URLClassLoader;
import java.util.List;
import java.util.logging.Level;
import java.util.logging.Logger;
import java.io.File;

/**
 * {@link URLClassLoader} that listens to {@link Repository} changes and add those jar files automatically.
 *
 * @author Sahoo
 */
final class ExtensibleClassLoader extends URLClassLoader implements RepositoryChangeListener {
    ExtensibleClassLoader(URL[] urls, ClassLoader parent, List<Repository> repos) {
        super(urls, parent);
        for (Repository repo : repos) {
            // Add all the existing libraries to classloader
            for(URI uri : repo.getJarLocations()) {
                if (addURI(uri)) {
                    LOGGER.info("Added " + uri + " to shared classpath");
                }
            }
            repo.addListener(this);
        }
    }

    public void jarAdded(java.net.URI uri) {
        added(uri);
     }

    public void jarRemoved(java.net.URI uri) {
        removed(uri);
     }

    public void added(URI uri) {
        File file =new File(uri);
        if (file.isDirectory()) {
            LOGGER.info("directory not support, please contribute");
        }
        if (addURI(uri)) {
            LOGGER.info("Added " + uri + " to shared classpath, no need to restart appserver");
        }
    }

    public void removed(URI uri) {
    }

    public void moduleAdded(ModuleDefinition moduleDefinition) {
    }

    public void moduleRemoved(ModuleDefinition moduleDefinition) {
    }

    private boolean addURI(URI uri) {
        boolean success = false;
        try {
            super.addURL(uri.toURL());
            success = true;
        } catch (MalformedURLException e) {
            LOGGER.log(Level.SEVERE, "Cannot add new added library to shared classpath", e);
        }
        return success;
    }

    private static final Logger LOGGER = Logger.getLogger(ExtensibleClassLoader.class.getName());
}