org.apache.cxf.bus.osgi.CXFExtensionBundleListener Maven / Gradle / Ivy
/**
* 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.net.URL;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.List;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
import java.util.concurrent.CopyOnWriteArrayList;
import java.util.logging.Logger;
import org.apache.cxf.Bus;
import org.apache.cxf.bus.extension.Extension;
import org.apache.cxf.bus.extension.ExtensionException;
import org.apache.cxf.bus.extension.ExtensionRegistry;
import org.apache.cxf.bus.extension.TextExtensionFragmentParser;
import org.apache.cxf.common.i18n.Message;
import org.apache.cxf.common.logging.LogUtils;
import org.osgi.framework.Bundle;
import org.osgi.framework.BundleContext;
import org.osgi.framework.BundleEvent;
import org.osgi.framework.ServiceReference;
import org.osgi.framework.SynchronousBundleListener;
public class CXFExtensionBundleListener implements SynchronousBundleListener {
private static final Logger LOG = LogUtils.getL7dLogger(CXFActivator.class);
private long id;
private ConcurrentMap> extensions
= new ConcurrentHashMap>(16, 0.75f, 4);
public CXFExtensionBundleListener(long bundleId) {
this.id = bundleId;
}
public void registerExistingBundles(BundleContext context) throws IOException {
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 bundleChanged(BundleEvent event) {
if (event.getType() == BundleEvent.RESOLVED && id != event.getBundle().getBundleId()) {
register(event.getBundle());
} else if (event.getType() == BundleEvent.UNRESOLVED || event.getType() == BundleEvent.UNINSTALLED) {
unregister(event.getBundle().getBundleId());
}
}
protected void register(final Bundle bundle) {
Enumeration e = bundle.findEntries("META-INF/cxf/", "bus-extensions.txt", false);
while (e != null && e.hasMoreElements()) {
List orig = new TextExtensionFragmentParser(null).getExtensions((URL)e.nextElement());
addExtensions(bundle, orig);
}
}
private boolean addExtensions(final Bundle bundle, List orig) {
if (orig.isEmpty()) {
return false;
}
List names = new ArrayList(orig.size());
for (Extension ext : orig) {
names.add(ext.getName());
}
LOG.info("Adding the extensions from bundle " + bundle.getSymbolicName()
+ " (" + bundle.getBundleId() + ") " + names);
List list = extensions.get(bundle.getBundleId());
if (list == null) {
list = new CopyOnWriteArrayList();
List preList = extensions.putIfAbsent(bundle.getBundleId(), list);
if (preList != null) {
list = preList;
}
}
for (Extension ext : orig) {
list.add(new OSGiExtension(ext, bundle));
}
ExtensionRegistry.addExtensions(list);
return !list.isEmpty();
}
protected void unregister(final long bundleId) {
List list = extensions.remove(bundleId);
if (list != null) {
LOG.info("Removing the extensions for bundle " + bundleId);
ExtensionRegistry.removeExtensions(list);
}
}
public void shutdown() {
while (!extensions.isEmpty()) {
unregister(extensions.keySet().iterator().next());
}
}
public class OSGiExtension extends Extension {
final Bundle bundle;
Object serviceObject;
public OSGiExtension(Extension e, Bundle b) {
super(e);
bundle = b;
}
public void setServiceObject(Object o) {
serviceObject = o;
obj = o;
}
public Object load(ClassLoader cl, Bus b) {
if (interfaceName == null && bundle.getBundleContext() != null) {
ServiceReference ref = bundle.getBundleContext().getServiceReference(className);
if (ref != null && ref.getBundle().getBundleId() == bundle.getBundleId()) {
Object o = bundle.getBundleContext().getService(ref);
serviceObject = o;
obj = o;
return obj;
}
}
return super.load(cl, b);
}
protected Class tryClass(String name, ClassLoader cl) {
Class c = null;
Throwable origExc = null;
try {
c = bundle.loadClass(className);
} catch (Throwable e) {
origExc = e;
}
if (c == null) {
try {
return super.tryClass(name, cl);
} catch (ExtensionException ee) {
if (origExc != null) {
throw new ExtensionException(new Message("PROBLEM_LOADING_EXTENSION_CLASS",
Extension.LOG, name),
origExc);
} else {
throw ee;
}
}
}
return c;
}
public Extension cloneNoObject() {
OSGiExtension ext = new OSGiExtension(this, bundle);
ext.obj = serviceObject;
return ext;
}
}
}