/*
* 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.felix.http.samples.cometd;
import java.util.Hashtable;
import javax.servlet.Servlet;
import javax.servlet.ServletException;
import org.apache.felix.http.cometd.CometdService;
import org.cometd.bayeux.server.BayeuxServer;
import org.osgi.framework.BundleActivator;
import org.osgi.framework.BundleContext;
import org.osgi.framework.ServiceReference;
import org.osgi.framework.ServiceRegistration;
import org.osgi.service.http.HttpService;
import org.osgi.service.http.NamespaceException;
import org.osgi.util.tracker.ServiceTracker;
import org.osgi.util.tracker.ServiceTrackerCustomizer;
public final class Activator
implements BundleActivator, ServiceTrackerCustomizer
{
private BundleContext context;
private ServiceTracker cometdServiceTracker;
private ServiceTracker httpServiceTracker;
private ServiceRegistration reg;
public void start(BundleContext context)
throws Exception
{
this.context = context;
this.cometdServiceTracker = new ServiceTracker(this.context, CometdService.class.getName(), this);
this.cometdServiceTracker.open();
this.httpServiceTracker = new ServiceTracker(this.context, HttpService.class.getName(), new HTTPServiceCustomizer());
this.httpServiceTracker.open();
}
public void stop(BundleContext context)
throws Exception
{
if (this.cometdServiceTracker != null) {
this.cometdServiceTracker.close();
}
if (this.httpServiceTracker != null) {
this.httpServiceTracker.close();
}
this.unregister();
}
public Object addingService(ServiceReference reference)
{
Object service = this.context.getService(reference);
this.register((CometdService)service);
return service;
}
public void modifiedService(ServiceReference reference, Object service)
{
this.unregister();
this.register((CometdService)service);
}
public void removedService(ServiceReference reference, Object service)
{
this.unregister();
}
private void register(CometdService cometdService) {
try {
BayeuxServer bayeuxServer = cometdService.getBayeuxServer();
if (bayeuxServer != null) {
Hashtable<String, String> props = new Hashtable<String, String>();
props.put("alias", "/system/time");
// whiteboard servlet registration
this.reg = context.registerService(Servlet.class.getName(), new TimeServlet(bayeuxServer), props);
doLog("Connect a browser to http://<host>:<port>/system/time to view the time.");
}
else {
doLog("Failed to get bayeux server");
}
}
catch (ServletException e) {
doLog("Failed to register TimeServlet at /system/time: " + e.getMessage());
}
}
private void unregister() {
if (this.reg != null) {
this.reg.unregister();
this.reg = null;
}
}
private void doLog(String message)
{
System.out.println("## Activator: " + message);
}
class HTTPServiceCustomizer implements ServiceTrackerCustomizer {
public Object addingService(ServiceReference reference) {
HttpService httpService = (HttpService) context.getService(reference);
try {
httpService.registerResources("/js", "/src-web", null);
} catch (NamespaceException e) {
e.printStackTrace();
}
return null;
}
public void modifiedService(ServiceReference reference, Object service) {
}
public void removedService(ServiceReference reference, Object service) {
HttpService httpService = (HttpService) context.getService(reference);
httpService.unregister("/js");
}
}
}