/*
* 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.net.URL;
import javax.management.InstanceNotFoundException;
import javax.management.MBeanServer;
import javax.management.Notification;
import javax.management.NotificationListener;
import javax.management.ObjectName;
import org.jboss.mx.loading.HeirarchicalLoaderRepository3;
import org.jboss.mx.loading.LoaderRepository;
import org.jboss.mx.util.MBeanServerLocator;
/**
*
* @author <a href="kabir.khan@jboss.com">Kabir Khan</a>
* @version $Revision: 1.1 $
*/
public class LoaderRepositoryUrlUtil implements NotificationListener
{
final static MBeanServer SERVER;
final static ObjectName MAIN_LOADER_REPOSITORY_OBJECT_NAME;
final static LoaderRepository MAIN_LOADER_REPOSITORY;
static
{
SERVER = MBeanServerLocator.locateJBoss();
try
{
MAIN_LOADER_REPOSITORY_OBJECT_NAME = new ObjectName("JMImplementation:name=Default,service=LoaderRepository");
MAIN_LOADER_REPOSITORY = (LoaderRepository)SERVER.invoke(MAIN_LOADER_REPOSITORY_OBJECT_NAME, "getInstance", new Object[0], new String[0]);
}
catch (Exception e)
{
throw new RuntimeException(e);
}
}
long currentSequenceNumber;
long lastSequenceNumber = -1;
URL[] urls;
public LoaderRepositoryUrlUtil()
{
try
{
SERVER.addNotificationListener(MAIN_LOADER_REPOSITORY_OBJECT_NAME, this, null, null);
}
catch (InstanceNotFoundException e)
{
throw new RuntimeException(e);
}
}
public synchronized void handleNotification(Notification notification, Object handback)
{
if (notification.getType().equals(LoaderRepository.CLASSLOADER_ADDED))
{
currentSequenceNumber = notification.getSequenceNumber();
}
else if (notification.getType().equals(LoaderRepository.CLASSLOADER_REMOVED))
{
currentSequenceNumber = notification.getSequenceNumber();
}
}
public synchronized UrlInfo getURLInfo(HeirarchicalLoaderRepository3 scopedLoader, UrlInfo urlInfo)
{
boolean changed = false;
if (lastSequenceNumber != currentSequenceNumber)
{
urls = MAIN_LOADER_REPOSITORY.getURLs();
lastSequenceNumber = currentSequenceNumber;
changed = true;
}
if (!changed)
{
changed = urlInfo != null && (urlInfo.getSequenceNumber() != lastSequenceNumber);
}
if (urlInfo == null || changed)
{
URL[] localUrls = getLocalUrls(scopedLoader, urls);
urlInfo = new UrlInfo(urls, localUrls, lastSequenceNumber);
}
return urlInfo;
}
public long getCurrentSequenceNumber()
{
return currentSequenceNumber;
}
private URL[] getLocalUrls(HeirarchicalLoaderRepository3 scopedRepository, URL[] globalUrls)
{
URL[] scopedRepositoryUrls = scopedRepository.getURLs();
//This is a bit of a hack, since this relies on the order of the urls returned by HeirarchicalLoaderRepository3
//My urls, followed by parent urls.
int scopedLength = 0;
for (int i = 0 ; i < scopedRepositoryUrls.length ; i++)
{
URL scopedUrl = scopedRepositoryUrls[i];
for (int j = 0 ; j < globalUrls.length ; j ++)
{
URL globalUrl = globalUrls[j];
if (scopedRepositoryUrls[i].equals(globalUrls[j]))
{
scopedLength = i;
break;
}
}
if (scopedLength > 0)
{
break;
}
}
URL[] localUrls = new URL[scopedLength];
System.arraycopy(scopedRepositoryUrls, 0, localUrls, 0, scopedLength);
return localUrls;
}
public class UrlInfo
{
URL[] globalUrls;
URL[] localUrls;
long sequenceNumber;
public UrlInfo(URL[] globalUrls, URL[] localUrls, long sequenceNumber)
{
super();
this.globalUrls = globalUrls;
this.localUrls = localUrls;
this.sequenceNumber = sequenceNumber;
}
public URL[] getGlobalUrls()
{
return globalUrls;
}
public URL[] getLocalUrls()
{
return localUrls;
}
public long getSequenceNumber()
{
return sequenceNumber;
}
}
}
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