org.glassfish.appclient.client.acc.agent.ACCAgentClassLoader Maven / Gradle / Ivy
Show all versions of payara-micro Show documentation
/*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
*
* Copyright (c) 1997-2011 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:
* "Portions Copyright [year] [name of copyright owner]"
*
* Contributor(s):
* 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
* holder.
*/
package org.glassfish.appclient.client.acc.agent;
import java.io.File;
import java.io.IOException;
import java.net.URI;
import java.net.URISyntaxException;
import java.net.URL;
import java.net.URLClassLoader;
import java.net.URLStreamHandlerFactory;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Enumeration;
import java.util.List;
import java.util.ListIterator;
/**
* Used as the system class loader during app client launch.
*
* The main role of this class loader is to find a splash screen image
* that might be specified in the manifest of the app client. Once the
* ACC begins working it will create an ACCClassLoader for loading
* client classes and locating client resources.
*
* @author tjquinn
*/
public class ACCAgentClassLoader extends URLClassLoader {
private boolean isActive = true;
public ACCAgentClassLoader(ClassLoader parent) {
/*
* This constructor is used by the VM to create a
* system class loader (as specified by -Djava.system.class.loader
* on the java command created from the appclient script).
*
* Actually create two new loaders. One will handle the GlassFish system JARs
* and the second will temporarily handle the application resources -
* typically for a splash screen.
*/
super(userClassPath(),
prepareLoader(GFSystemClassPath(), parent.getParent()));
}
private static URLClassLoader prepareLoader(final URL[] urls, final ClassLoader parent) {
return AccessController.doPrivileged(new PrivilegedAction() {
@Override
public URLClassLoader run() {
return new URLClassLoader(urls, parent);
}
});
}
public ACCAgentClassLoader(URL[] urls) {
super(urls);
}
public ACCAgentClassLoader(URL[] urls, ClassLoader parent) {
super(urls, parent);
}
public ACCAgentClassLoader(URL[] urls, ClassLoader parent, URLStreamHandlerFactory factory) {
super(urls, parent, factory);
}
@Override
public synchronized Class loadClass(String name) throws ClassNotFoundException {
if (isActive && isStillActive()) {
return super.loadClass(name);
} else {
return getParent().loadClass(name);
}
}
@Override
public URL getResource(String name) {
if (isActive && isStillActive()) {
return super.getResource(name);
} else {
return getParent().getResource(name);
}
}
@Override
public Enumeration getResources(String name) throws IOException {
if (isActive && isStillActive()) {
return super.getResources(name);
} else {
return getParent().getResources(name);
}
}
private boolean isStillActive() {
if (isActive) {
final String propValue = System.getProperty("org.glassfish.appclient.acc.agentLoaderDone");
isActive = (propValue != null);
}
return isActive;
}
private static URL[] userClassPath() {
final URI GFSystemURI = GFSystemURI();
final List result = classPathToURLs(System.getProperty("java.class.path"));
for (ListIterator it = result.listIterator(); it.hasNext();) {
final URL url = it.next();
try {
if (url.toURI().equals(GFSystemURI)) {
it.remove();
}
} catch (URISyntaxException ex) {
throw new RuntimeException(ex);
}
}
// result.addAll(classPathToURLs(System.getenv("APPCPATH")));
return result.toArray(new URL[result.size()]);
}
private static URL[] GFSystemClassPath() {
try {
return new URL[] {GFSystemURI().normalize().toURL()};
} catch (Exception ex) {
throw new RuntimeException(ex);
}
}
private static URI GFSystemURI() {
try {
Class agentClass = Class.forName("org.glassfish.appclient.client.acc.agent.AppClientContainerAgent");
return agentClass.getProtectionDomain().getCodeSource().getLocation().toURI().normalize();
} catch (Exception ex) {
throw new RuntimeException(ex);
}
}
private static List classPathToURLs(final String classPath) {
if (classPath == null) {
return Collections.EMPTY_LIST;
}
final List result = new ArrayList();
try {
for (String classPathElement : classPath.split(File.pathSeparator)) {
result.add(new File(classPathElement).toURI().normalize().toURL());
}
return result;
} catch (Exception ex) {
throw new RuntimeException(ex);
}
}
}