/*
* 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.proxy;
import org.osgi.framework.BundleContext;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.ServletException;
import javax.servlet.ServletConfig;
import java.io.IOException;
public final class ProxyServlet
extends HttpServlet
{
private DispatcherTracker tracker;
@Override
public void init(ServletConfig config)
throws ServletException
{
super.init(config);
try {
doInit();
} catch (ServletException e) {
throw e;
} catch (Exception e) {
throw new ServletException(e);
}
}
private void doInit()
throws Exception
{
this.tracker = new DispatcherTracker(getBundleContext(), null, getServletConfig());
this.tracker.open();
}
@Override
protected void service(HttpServletRequest req, HttpServletResponse res)
throws ServletException, IOException
{
HttpServlet dispatcher = this.tracker.getDispatcher();
if (dispatcher != null) {
dispatcher.service(req, res);
} else {
res.sendError(HttpServletResponse.SC_SERVICE_UNAVAILABLE);
}
}
@Override
public void destroy()
{
this.tracker.close();
super.destroy();
}
private BundleContext getBundleContext()
throws ServletException
{
Object context = getServletContext().getAttribute(BundleContext.class.getName());
if (context instanceof BundleContext) {
return (BundleContext)context;
}
throw new ServletException("Bundle context attribute [" + BundleContext.class.getName() +
"] not set in servlet context");
}
}