| /* |
| * 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"); |
| } |
| } |