001 /**
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements. See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License. You may obtain a copy of the License at
008 *
009 * http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017 package org.apache.camel.component.http;
018
019 import java.io.IOException;
020 import java.util.concurrent.ConcurrentHashMap;
021
022 import javax.servlet.ServletException;
023 import javax.servlet.http.HttpServlet;
024 import javax.servlet.http.HttpServletRequest;
025 import javax.servlet.http.HttpServletResponse;
026
027 import org.apache.camel.Exchange;
028 import org.apache.camel.ExchangePattern;
029 import org.apache.camel.impl.DefaultExchange;
030 import org.apache.commons.logging.Log;
031 import org.apache.commons.logging.LogFactory;
032
033 /**
034 * @version $Revision: 946167 $
035 */
036 public class CamelServlet extends HttpServlet {
037
038 private static final long serialVersionUID = -7061982839117697829L;
039 private static final transient Log LOG = LogFactory.getLog(CamelServlet.class);
040
041 private ConcurrentHashMap<String, HttpConsumer> consumers = new ConcurrentHashMap<String, HttpConsumer>();
042
043 @Override
044 protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
045 try {
046
047 // Is there a consumer registered for the request.
048 HttpConsumer consumer = resolve(request);
049 if (consumer == null) {
050 response.sendError(HttpServletResponse.SC_NOT_FOUND);
051 return;
052 }
053
054 // are we suspended?
055 if (consumer.isSuspended()) {
056 response.sendError(HttpServletResponse.SC_SERVICE_UNAVAILABLE);
057 return;
058 }
059
060 // create exchange and set data on it
061 Exchange exchange = new DefaultExchange(consumer.getEndpoint(), ExchangePattern.InOut);
062 if (consumer.getEndpoint().isBridgeEndpoint()) {
063 exchange.setProperty(Exchange.SKIP_GZIP_ENCODING, Boolean.TRUE);
064 }
065 if (consumer.getEndpoint().isDisableStreamCache()) {
066 exchange.setProperty(Exchange.DISABLE_HTTP_STREAM_CACHE, Boolean.TRUE);
067 }
068 exchange.setIn(new HttpMessage(exchange, request, response));
069
070 // Have the camel process the HTTP exchange.
071 consumer.getProcessor().process(exchange);
072
073 // now lets output to the response
074 consumer.getBinding().writeResponse(exchange, response);
075
076 } catch (Exception e) {
077 LOG.error("Error processing request", e);
078 throw new ServletException(e);
079 }
080 }
081
082 protected HttpConsumer resolve(HttpServletRequest request) {
083 String path = request.getPathInfo();
084 if (path == null) {
085 return null;
086 }
087 HttpConsumer answer = consumers.get(path);
088
089 if (answer == null) {
090 for (String key : consumers.keySet()) {
091 if (consumers.get(key).getEndpoint().isMatchOnUriPrefix() && path.startsWith(key)) {
092 answer = consumers.get(key);
093 break;
094 }
095 }
096 }
097 return answer;
098 }
099
100 public void connect(HttpConsumer consumer) {
101 consumers.put(consumer.getPath(), consumer);
102 }
103
104 public void disconnect(HttpConsumer consumer) {
105 consumers.remove(consumer.getPath());
106 }
107
108 }