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/*
* 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.tuscany.sca.http.osgi;
import javax.servlet.Servlet;
import org.osgi.framework.BundleContext;
import org.osgi.framework.InvalidSyntaxException;
import org.osgi.framework.ServiceEvent;
import org.osgi.framework.ServiceListener;
import org.osgi.framework.ServiceReference;
import org.osgi.service.http.HttpService;
import org.osgi.util.tracker.ServiceTracker;
/**
* A whiteboard for HttpService and Servlet
*/
public class HttpServiceWrapper {
static final String SERVLET_URI = "servlet.uri";
private ServiceTracker httpTracker;
private BundleContext bc;
private class HttpServiceTracker extends ServiceTracker {
private HttpServiceTracker() {
super(bc, HttpService.class.getName(), null);
}
@Override
public Object addingService(ServiceReference reference) {
HttpService httpService = (HttpService)super.addingService(reference);
// Register existing servlets
String filter = "(objectclass=" + Servlet.class.getName() + ")";
ServiceReference[] servlets = null;
try {
servlets = bc.getServiceReferences(null, filter);
} catch (InvalidSyntaxException e) {
throw new IllegalStateException(e);
}
for (int i = 0; servlets != null && i < servlets.length; i++) {
Servlet servlet = (Servlet)bc.getService(servlets[i]);
String alias = (String)servlets[i].getProperty(SERVLET_URI);
try {
httpService.registerServlet(alias, servlet, null, null);
} catch (Exception e) {
throw new IllegalStateException(e);
}
}
return httpService;
}
}
public HttpServiceWrapper(BundleContext bc) {
super();
this.bc = bc;
}
void open() {
httpTracker = new HttpServiceTracker();
httpTracker.open();
ServiceListener sl = new ServiceListener() {
public void serviceChanged(ServiceEvent ev) {
ServiceReference sr = ev.getServiceReference();
switch (ev.getType()) {
case ServiceEvent.REGISTERED: {
registerServlet(sr);
}
break;
case ServiceEvent.UNREGISTERING: {
unregisterServlet(sr);
}
break;
}
}
};
String filter = "(objectclass=" + Servlet.class.getName() + ")";
try {
bc.addServiceListener(sl, filter);
ServiceReference[] servlets = bc.getServiceReferences(null, filter);
for (int i = 0; servlets != null && i < servlets.length; i++) {
sl.serviceChanged(new ServiceEvent(ServiceEvent.REGISTERED, servlets[i]));
}
} catch (InvalidSyntaxException e) {
e.printStackTrace();
}
}
void close() {
if (httpTracker != null) {
httpTracker.close();
}
}
void registerServlet(ServiceReference sr) {
Servlet servlet = (Servlet)bc.getService(sr);
String alias = (String)sr.getProperty(SERVLET_URI);
Object[] httpServices = httpTracker.getServices();
for (int i = 0; httpServices != null && i < httpServices.length; i++) {
HttpService http = (HttpService)httpServices[i];
try {
http.registerServlet(alias, servlet, null, null);
} catch (Exception e) {
throw new IllegalStateException(e);
}
}
}
void unregisterServlet(ServiceReference sr) {
String alias = (String)sr.getProperty(SERVLET_URI);
Object[] httpServices = httpTracker.getServices();
for (int i = 0; httpServices != null && i < httpServices.length; i++) {
HttpService http = (HttpService)httpServices[i];
try {
http.unregister(alias);
} catch (Exception e) {
throw new IllegalStateException(e);
}
bc.ungetService(sr);
}
}
}
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