/*
* JBoss, Home of Professional Open Source.
* Copyright 2006, 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.aop.deployment;
import java.io.File;
import java.lang.ref.WeakReference;
import java.net.URL;
import java.util.Iterator;
import org.jboss.aop.AspectManager;
import org.jboss.aop.classpool.AOPClassPool;
import org.jboss.aop.classpool.AOPClassPoolRepository;
import org.jboss.aop.deployment.LoaderRepositoryUrlUtil.UrlInfo;
import org.jboss.mx.loading.HeirarchicalLoaderRepository3;
import org.jboss.mx.loading.LoaderRepository;
import org.jboss.mx.loading.RepositoryClassLoader;
import javassist.ClassPool;
import javassist.CtClass;
import javassist.NotFoundException;
import javassist.scopedpool.ScopedClassPoolRepository;
/**
* A classpool in JBoss backed by a scoped (HierarchicalLoaderRepository) loader repository
*
* @author <a href="kabir.khan@jboss.com">Kabir Khan</a>
* @version $Revision: 1.1 $
*/
public class ScopedJBossClassPool extends JBossClassPool
{
final static LoaderRepositoryUrlUtil LOADER_REPOSITORY_UTIL = new LoaderRepositoryUrlUtil();
WeakReference repository = null;
UrlInfo urlInfo;
ThreadLocal lastPool = new ThreadLocal();
protected ScopedJBossClassPool(ClassLoader cl, ClassPool src, ScopedClassPoolRepository repository, File tmp, URL tmpURL)
{
super(cl, src, repository, tmp, tmpURL);
boolean parentFirst = false;
LoaderRepository loaderRepository = null;
ClassLoader prnt = cl;
while (prnt != null)
{
if (prnt instanceof RepositoryClassLoader)
{
loaderRepository = ((RepositoryClassLoader)prnt).getLoaderRepository();
if (loaderRepository instanceof HeirarchicalLoaderRepository3)
{
parentFirst = ((HeirarchicalLoaderRepository3)loaderRepository).getUseParentFirst();
}
break;
}
prnt = cl.getParent();
}
super.childFirstLookup = !parentFirst;
}
private HeirarchicalLoaderRepository3 getRepository()
{
//FIXME - Once Javassist > 3.3.0 is out use getClassLoader0() and get rid of try/catch
ClassLoader cl = null;
try
{
cl = getClassLoader();
}
catch (RuntimeException e)
{
//Ignore, the ScopedClassPoll throws an exception if pool is not associated with a cl
}
if (cl != null)
{
return (HeirarchicalLoaderRepository3)((RepositoryClassLoader)cl).getLoaderRepository();
}
return null;
}
private URL getResourceUrlForClass(String resourcename)
{
HeirarchicalLoaderRepository3 repo = getRepository();
return repo.getResource(resourcename, super.getClassLoader());
}
private boolean isMine(URL url)
{
HeirarchicalLoaderRepository3 repo = getRepository();
if (repo != null)
{
//The URL of the class loaded with my scoped classloader
if (url != null)
{
urlInfo = LOADER_REPOSITORY_UTIL.getURLInfo(getRepository(), urlInfo);
URL[] myUrls = urlInfo.getLocalUrls();
String resource = url.toString();
for (int i = 0 ; i < myUrls.length ; i++)
{
if (resource.indexOf(myUrls[i].toString()) >= 0)
{
return true;
}
}
return false;
}
}
return true;
}
public CtClass getCached(String classname)
{
if (classname == null)
{
return null;
}
if (generatedClasses.get(classname) != null)
{
//It is a new class, and this callback is probably coming from the frozen check when creating a new nested class
return super.getCached(classname);
}
//Is this from the scoped classloader itself of from the parent?
String resourcename = getResourceName(classname);
URL url = getResourceUrlForClass(resourcename);
boolean isMine = isMine(url);
if (isMine)
{
if (super.childFirstLookup)
{
//Parent delegation is false, attempt to get this class out of ourselves
CtClass clazz = super.getCachedLocally(classname);
if (clazz == null)
{
clazz = createCtClass(classname, false);
if (clazz != null)
{
lockInCache(clazz);
}
}
if (clazz != null)
{
return clazz;
}
}
return super.getCached(classname);
}
try
{
ClassPool pool = getCorrectPoolForResource(url);
if (pool != lastPool.get())
{
lastPool.set(pool);
return pool.get(classname);
}
}
catch (NotFoundException e)
{
}
catch(StackOverflowError e)
{
throw e;
}
finally
{
lastPool.set(null);
}
return null;
}
private ClassPool getCorrectPoolForResource(URL url)
{
synchronized(AspectManager.getRegisteredCLs())
{
for(Iterator it = AspectManager.getRegisteredCLs().values().iterator() ; it.hasNext() ; )
{
AOPClassPool candidate = (AOPClassPool)it.next();
if (candidate.isUnloadedClassLoader())
{
AspectManager.instance().unregisterClassLoader(candidate.getClassLoader());
continue;
}
if (candidate.getClassLoader() instanceof RepositoryClassLoader)
{
//Sometimes the ClassLoader is a proxy for MBeanProxyExt?!
RepositoryClassLoader rcl = (RepositoryClassLoader)candidate.getClassLoader();
URL[] urls = rcl.getClasspath();
String resource = url.toString();
for (int i = 0 ; i < urls.length ; i++)
{
if (resource.indexOf(urls[i].toString()) >= 0)
{
return candidate;
}
}
}
}
}
return AOPClassPool.createAOPClassPool(ClassPool.getDefault(), AOPClassPoolRepository.getInstance());
}
}
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