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Apache CXF JAX-RS Bundle Jar
/**
* 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.Collections;
import java.util.Dictionary;
import java.util.Enumeration;
import java.util.List;
import java.util.Properties;
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.ExtensionFragmentParser;
import org.apache.cxf.bus.extension.ExtensionRegistry;
import org.apache.cxf.buslifecycle.BusLifeCycleListener;
import org.apache.cxf.buslifecycle.BusLifeCycleManager;
import org.apache.cxf.common.logging.LogUtils;
import org.osgi.framework.Bundle;
import org.osgi.framework.BundleActivator;
import org.osgi.framework.BundleContext;
import org.osgi.framework.BundleEvent;
import org.osgi.framework.Constants;
import org.osgi.framework.ServiceRegistration;
import org.osgi.framework.SynchronousBundleListener;
import org.osgi.framework.Version;
/**
*
*/
public class OSGiExtensionLocator implements BundleActivator, SynchronousBundleListener {
private static final Logger LOG = LogUtils.getL7dLogger(OSGiExtensionLocator.class);
private ConcurrentMap> extensions
= new ConcurrentHashMap>();
private long id;
private Extension listener;
/** {@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();
registerBusListener();
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);
unregisterBusListener();
while (!extensions.isEmpty()) {
unregister(extensions.keySet().iterator().next());
}
}
private void registerBusListener() {
listener = new Extension(OSGIBusListener.class);
ExtensionRegistry.addExtensions(Collections.singletonList(listener));
}
private void unregisterBusListener() {
ExtensionRegistry.removeExtensions(Collections.singletonList(listener));
listener = null;
}
protected void register(final Bundle bundle) throws IOException {
List 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 orig = new ExtensionFragmentParser()
.getExtensionsFromText(ins);
ins.close();
LOG.info("Loading the extension from bundle " + bundle.getBundleId());
if (orig != null && !orig.isEmpty()) {
if (list == null) {
list = new CopyOnWriteArrayList();
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 list = extensions.remove(bundleId);
if (list != null) {
LOG.info("Removed the extensions for bundle " + bundleId);
ExtensionRegistry.removeExtensions(list);
}
}
public static class OSGIBusListener implements BusLifeCycleListener {
public static final String CONTEXT_SYMBOLIC_NAME_PROPERTY = "cxf.context.symbolicname";
public static final String CONTEXT_VERSION_PROPERTY = "cxf.context.version";
public static final String CONTEXT_NAME_PROPERTY = "cxf.bus.id";
Bus bus;
ServiceRegistration service;
public OSGIBusListener(Bus b) {
bus = b;
bus.getExtension(BusLifeCycleManager.class).registerLifeCycleListener(this);
}
private Version getBundleVersion(Bundle bundle) {
Dictionary headers = bundle.getHeaders();
String version = (String) headers.get(Constants.BUNDLE_VERSION);
return (version != null) ? Version.parseVersion(version) : Version.emptyVersion;
}
public void initComplete() {
BundleContext context = bus.getExtension(BundleContext.class);
if (context != null) {
Properties props = new Properties();
props.put(CONTEXT_SYMBOLIC_NAME_PROPERTY, context.getBundle().getSymbolicName());
props.put(CONTEXT_VERSION_PROPERTY, getBundleVersion(context.getBundle()));
props.put(CONTEXT_NAME_PROPERTY, bus.getId());
service = context.registerService(Bus.class.getName(), bus, props);
}
}
public void preShutdown() {
}
public void postShutdown() {
if (service != null) {
service.unregister();
service = null;
}
}
}
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);
}
public Extension cloneNoObject() {
OSGiExtension ext = new OSGiExtension(this, bundle);
ext.obj = null;
return ext;
}
}
}
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