001 /**
002 *
003 * Licensed to the Apache Software Foundation (ASF) under one or more
004 * contributor license agreements. See the NOTICE file distributed with
005 * this work for additional information regarding copyright ownership.
006 * The ASF licenses this file to You under the Apache License, Version 2.0
007 * (the "License"); you may not use this file except in compliance with
008 * the License. You may obtain a copy of the License at
009 *
010 * http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing, software
013 * distributed under the License is distributed on an "AS IS" BASIS,
014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015 * See the License for the specific language governing permissions and
016 * limitations under the License.
017 */
018 package org.apache.camel.component.http;
019
020 import java.io.IOException;
021 import java.util.concurrent.ConcurrentHashMap;
022
023 import javax.servlet.ServletException;
024 import javax.servlet.http.HttpServlet;
025 import javax.servlet.http.HttpServletRequest;
026 import javax.servlet.http.HttpServletResponse;
027
028 /**
029 * @version $Revision: 549890 $
030 */
031 public class CamelServlet extends HttpServlet {
032
033 private ConcurrentHashMap<String, HttpConsumer> consumers=new ConcurrentHashMap<String, HttpConsumer>();
034
035 public CamelServlet() {
036 }
037
038 @Override
039 protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
040 try {
041
042 // Is there a consumer registered for the request.
043 HttpConsumer consumer = resolve(request);
044 if( consumer == null ) {
045 response.sendError(HttpServletResponse.SC_NOT_FOUND);
046 return;
047 }
048
049 // Have the camel process the HTTP exchange.
050 HttpExchange exchange = new HttpExchange(consumer.getEndpoint(), request, response);
051 consumer.getProcessor().process(exchange);
052
053 // HC: The getBinding() is interesting because it illustrates the impedance miss-match between
054 // HTTP's stream oriented protocol, and Camels more message oriented protocol exchanges.
055
056 // now lets output to the response
057 consumer.getBinding().writeResponse(exchange);
058
059 } catch (Exception e) {
060 throw new ServletException(e);
061 }
062 }
063
064 protected HttpConsumer resolve(HttpServletRequest request) {
065 String path = request.getPathInfo();
066 return consumers.get(path);
067 }
068
069 public void connect(HttpConsumer consumer) {
070 consumers.put(consumer.getPath(), consumer);
071 }
072
073 public void disconnect(HttpConsumer consumer) {
074 consumers.remove(consumer.getPath());
075 }
076
077 }