/*
* 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.cometd.internal;
import java.util.Dictionary;
import java.util.Hashtable;
import java.util.Properties;
import javax.servlet.http.HttpServlet;
import org.apache.felix.http.base.internal.logger.SystemLogger;
import org.apache.felix.http.cometd.CometdService;
import org.cometd.bayeux.server.BayeuxServer;
import org.cometd.server.CometdServlet;
import org.osgi.framework.BundleContext;
import org.osgi.framework.Constants;
import org.osgi.framework.ServiceReference;
import org.osgi.framework.ServiceRegistration;
import org.osgi.service.cm.ManagedService;
import org.osgi.service.http.HttpService;
import org.osgi.util.tracker.ServiceTracker;
import org.osgi.util.tracker.ServiceTrackerCustomizer;
public final class CometdServiceImpl
extends HttpServlet
implements ManagedService, ServiceTrackerCustomizer, CometdService
{
private static final long serialVersionUID = 1L;
private static final String PID = "org.apache.felix.http.cometd";
private final CometdConfig config;
private final BundleContext context;
private ServiceRegistration configServiceReg;
private ServiceTracker httpServiceTracker;
private ServiceRegistration cometdServiceReg;
private CometdServlet continuationCometdServlet;
public CometdServiceImpl(BundleContext context)
{
this.context = context;
this.config = new CometdConfig(this.context);
}
public void start()
throws Exception
{
Properties props = new Properties();
props.put(Constants.SERVICE_PID, PID);
this.configServiceReg = this.context.registerService(ManagedService.class.getName(), this, props);
this.httpServiceTracker = new ServiceTracker(this.context, HttpService.class.getName(), this);
this.httpServiceTracker.open();
}
public void stop()
throws Exception
{
if (this.configServiceReg != null) {
this.configServiceReg.unregister();
}
if (this.httpServiceTracker != null) {
this.httpServiceTracker.close();
}
}
public void updated(Dictionary props)
{
this.config.update(props);
if (this.httpServiceTracker != null) {
Object service = this.httpServiceTracker.getService();
if (service != null) {
this.unregister((HttpService)service);
this.register((HttpService)service);
}
}
}
public Object addingService(ServiceReference reference)
{
Object service = this.context.getService(reference);
this.register((HttpService)service);
return service;
}
public void modifiedService(ServiceReference reference, Object service)
{
this.unregister((HttpService)service);
this.register((HttpService)service);
}
public void removedService(ServiceReference reference, Object service)
{
this.unregister((HttpService)service);
}
private void register(HttpService httpService) {
if (this.continuationCometdServlet == null) {
this.continuationCometdServlet = new CometdServlet();
}
try {
Dictionary dictionary = new Hashtable();
dictionary.put("requestAvailable","true");
httpService.registerServlet(this.config.getPath(), this.continuationCometdServlet, dictionary, null);
}
catch (Exception e) {
SystemLogger.error("Failed to register ContinuationCometdServlet to " + this.config.getPath(), e);
}
this.cometdServiceReg =
this.context.registerService(CometdService.class.getName(), this, null);
}
private void unregister(HttpService httpService) {
httpService.unregister(this.config.getPath());
if (this.cometdServiceReg != null) {
this.cometdServiceReg.unregister();
this.cometdServiceReg = null;
}
}
public BayeuxServer getBayeuxServer() {
return this.continuationCometdServlet.getBayeux();
}
}