/*
* JBoss, Home of Professional Open Source.
* Copyright 2012, Red Hat, Inc., and individual contributors
* as indicated by the @author tags. See the copyright.txt file in the
* distribution for a full listing of individual contributors.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.jboss.as.plugin.server;
import java.net.URLClassLoader;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.util.concurrent.TimeUnit;
import org.codehaus.plexus.classworlds.realm.ClassRealm;
/**
* Security actions to perform possibly privileged operations. No methods in this class are to be made public under any
* circumstances!
*
* @author <a href="mailto:jperkins@redhat.com">James R. Perkins</a>
*/
final class SecurityActions {
/**
* Bad hack to respawn the plugin's class loader when Maven is already shut down.
*/
static void respawnCurrentClassLoader() {
ClassLoader classLoader = Thread.currentThread().getContextClassLoader();
if (!(classLoader instanceof ClassRealm)) {
// It seems there is nothing we can do if the current class loader is not a ClassRealm.
return;
}
// Modify the current class loader so that classes that was not loaded during the Maven build will be loaded by the new class loader.
final ClassRealm classRealm = (ClassRealm) classLoader;
ClassLoader newClassLoader = new URLClassLoader(classRealm.getURLs(), classRealm.getParentClassLoader()) {
@Override
protected Class<?> loadClass(String name, boolean resolve) throws ClassNotFoundException {
// We should first check whether the requested class was already loaded by the old class loader in order not to break compatibility with already loaded classes.
Class<?> clazz = classRealm.loadClassFromSelf(name);
return clazz != null ? clazz : super.loadClass(name, resolve);
}
};
classRealm.setParentClassLoader(newClassLoader);
}
static void registerShutdown(final Server server) {
final Thread hook = new Thread(new Runnable() {
@Override
public void run() {
respawnCurrentClassLoader();
server.stop();
// Bad hack to get maven to complete it's message output
try {
TimeUnit.MILLISECONDS.sleep(500L);
} catch (InterruptedException ignore) {
// no-op
}
}
});
hook.setDaemon(true);
addShutdownHook(hook);
}
static void addShutdownHook(final Thread hook) {
if (System.getSecurityManager() == null) {
Runtime.getRuntime().addShutdownHook(hook);
} else {
AccessController.doPrivileged(new PrivilegedAction<Object>() {
public Object run() {
Runtime.getRuntime().addShutdownHook(hook);
return null;
}
});
}
}
static String getEnvironmentVariable(final String key) {
if (System.getSecurityManager() == null) {
return System.getenv(key);
}
return AccessController.doPrivileged(new PrivilegedAction<String>() {
@Override
public String run() {
return System.getenv(key);
}
});
}
}