/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.apache.cxf.bus.osgi;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.util.Enumeration;
import java.util.List;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
import java.util.concurrent.CopyOnWriteArrayList;
import org.apache.cxf.bus.extension.Extension;
import org.apache.cxf.bus.extension.ExtensionFragmentParser;
import org.apache.cxf.bus.extension.ExtensionRegistry;
import org.osgi.framework.Bundle;
import org.osgi.framework.BundleActivator;
import org.osgi.framework.BundleContext;
import org.osgi.framework.BundleEvent;
import org.osgi.framework.SynchronousBundleListener;
/**
*
*/
public class OSGiExtensionLocator implements BundleActivator, SynchronousBundleListener {
private ConcurrentMap<Long, List<Extension>> extensions
= new ConcurrentHashMap<Long, List<Extension>>();
private long id;
/** {@inheritDoc}*/
public void bundleChanged(BundleEvent event) {
if (event.getType() == BundleEvent.RESOLVED && id != event.getBundle().getBundleId()) {
try {
register(event.getBundle());
} catch (Exception ex) {
//ignore
}
} else if (event.getType() == BundleEvent.UNRESOLVED || event.getType() == BundleEvent.UNINSTALLED) {
unregister(event.getBundle().getBundleId());
}
}
/** {@inheritDoc}*/
public void start(BundleContext context) throws Exception {
context.addBundleListener(this);
id = context.getBundle().getBundleId();
for (Bundle bundle : context.getBundles()) {
if ((bundle.getState() == Bundle.RESOLVED
|| bundle.getState() == Bundle.STARTING
|| bundle.getState() == Bundle.ACTIVE
|| bundle.getState() == Bundle.STOPPING)
&& bundle.getBundleId() != context.getBundle().getBundleId()) {
register(bundle);
}
}
}
/** {@inheritDoc}*/
public void stop(BundleContext context) throws Exception {
context.removeBundleListener(this);
while (!extensions.isEmpty()) {
unregister(extensions.keySet().iterator().next());
}
}
protected void register(final Bundle bundle) throws IOException {
List<Extension> list = extensions.get(bundle.getBundleId());
Enumeration e = bundle.findEntries("META-INF/cxf/", "bus-extensions.txt", false);
if (e != null) {
while (e.hasMoreElements()) {
final URL u = (URL)e.nextElement();
InputStream ins = u.openStream();
List<Extension> orig = new ExtensionFragmentParser()
.getExtensionsFromText(ins);
ins.close();
if (orig != null && !orig.isEmpty()) {
if (list == null) {
list = new CopyOnWriteArrayList<Extension>();
extensions.put(bundle.getBundleId(), list);
}
for (Extension ext : orig) {
list.add(new OSGiExtension(ext, bundle));
}
ExtensionRegistry.addExtensions(list);
}
}
}
}
protected void unregister(final long bundleId) {
List<Extension> list = extensions.remove(bundleId);
if (list != null) {
ExtensionRegistry.removeExtensions(list);
}
}
public class OSGiExtension extends Extension {
final Bundle bundle;
public OSGiExtension(Extension e, Bundle b) {
super(e);
bundle = b;
}
public Class<?> getClassObject(ClassLoader cl) {
if (clazz == null) {
try {
clazz = bundle.loadClass(className);
} catch (ClassNotFoundException e) {
//ignore, fall to super
}
}
return super.getClassObject(cl);
}
public Class<?> loadInterface(ClassLoader cl) {
try {
return bundle.loadClass(interfaceName);
} catch (ClassNotFoundException e) {
//ignore, fall to super
}
return super.loadInterface(cl);
}
}
}