/*
* JBoss, Home of Professional Open Source.
* Copyright 2007, Red Hat Middleware LLC, 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.test.classloader.old.test;
import java.net.URL;
import java.util.concurrent.CountDownLatch;
import junit.framework.Test;
import org.jboss.classloader.plugins.ClassLoaderUtils;
import org.jboss.classloader.spi.ClassLoaderSystem;
import org.jboss.classloader.test.support.MockClassLoaderPolicy;
import org.jboss.test.classloader.AbstractClassLoaderTest;
import org.jboss.test.classloader.old.support.Derived;
import org.jboss.test.classloader.old.support.Support;
/**
* CircularityErrorUnitTestCase.
*
* @author <a href="adrian@jboss.com">Adrian Brock</a>
* @author Simone.Bordet@hp.com
* @author Scott.Stark@jboss.org
* @version $Revision: 1.1 $
*/
public class CircularityErrorUnitTestCase extends AbstractClassLoaderTest
{
private CountDownLatch waiting = new CountDownLatch(1);
private Throwable sawError;
public static Test suite()
{
return suite(CircularityErrorUnitTestCase.class);
}
public CircularityErrorUnitTestCase(String name)
{
super(name);
}
public void testClassCircularityError() throws Exception
{
// The scenario is this one:
// Thread1 asks classloader1 to load class Derived
// Thread2 triggers a loadClassInternal for classloader1 to load class Base
// Thread2 is put in sleep by the ULR since we are loading Derived
// Thread1 triggers a loadClassInternal for classloader1 to load class Base
// Thread1 throws ClassCircularityError
ClassLoaderSystem system = createClassLoaderSystemWithModifiedBootstrap();
final ClassLoader cl = system.registerClassLoaderPolicy(new TestClassLoaderPolicy());
Class<?> cls = assertLoadClass(Support.class, cl);
Thread thread1 = new Thread(new Runnable()
{
public void run()
{
// Be sure thread2 is waiting
try
{
Thread.sleep(1000);
}
catch (InterruptedException x)
{
}
try
{
getLog().debug("Thread " + Thread.currentThread() + " loading...");
assertLoadClass(Derived.class, cl);
getLog().debug("Thread " + Thread.currentThread() + " loading done !");
}
catch (Throwable t)
{
sawError = t;
}
}
}, "CircularityErrorThread");
thread1.start();
getLog().debug("Thread " + Thread.currentThread() + " waiting...");
waiting.await();
getLog().debug("Thread " + Thread.currentThread() + " woken up !");
// Ask this thread to trigger a loadClassInternal directly; the thread will be put to sleep
// but the JVM has already registered the fact that
// it wants to load the class, in this case class Base
cls.newInstance();
thread1.join();
// The ClassCircularityError thrown should allow the call above to complete
if (sawError != null)
failure("Unexpected error", sawError);
}
public class TestClassLoaderPolicy extends MockClassLoaderPolicy
{
public TestClassLoaderPolicy()
{
setPaths(Support.class);
}
@Override
public URL getResource(String name)
{
getLog().debug(Thread.currentThread() + " is now asked to load class: " + name);
if (name.equals(ClassLoaderUtils.classNameToPath(Derived.class.getName())))
{
waiting.countDown();
// Wait to trigger ClassCircularityError
// Do not release the lock on the classloader
try
{
getLog().debug("Loading " + name + ", waiting...");
Thread.sleep(2000);
getLog().debug("Loading " + name + " end wait");
}
catch (InterruptedException x)
{
getLog().debug("Sleep was interrupted", x);
}
}
return super.getResource(name);
}
}
}