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.jetty;
018
019 import java.io.IOException;
020
021 import javax.servlet.ServletException;
022 import javax.servlet.http.HttpServletRequest;
023 import javax.servlet.http.HttpServletResponse;
024
025 import org.apache.camel.Exchange;
026 import org.apache.camel.component.http.CamelServlet;
027 import org.apache.camel.component.http.HttpConsumer;
028 import org.mortbay.util.ajax.Continuation;
029 import org.mortbay.util.ajax.ContinuationSupport;
030
031 /**
032 * @version $Revision: 816070 $
033 */
034 public class CamelContinuationServlet extends CamelServlet {
035
036 // TODO: should use the new Async API and allow end users to define if they want Jetty continuation support or not
037
038 private static final long serialVersionUID = 1L;
039
040 @Override
041 protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
042 try {
043 // Is there a consumer registered for the request.
044 HttpConsumer consumer = resolve(request);
045 if (consumer == null) {
046 response.sendError(HttpServletResponse.SC_NOT_FOUND);
047 return;
048 }
049
050 final Continuation continuation = ContinuationSupport.getContinuation(request, null);
051 if (continuation.isNew()) {
052 // Have the camel process the HTTP exchange.
053 // final DefaultExchange exchange = new DefaultExchange(consumer.getEndpoint(), ExchangePattern.InOut);
054 // exchange.setProperty(HttpConstants.SERVLET_REQUEST, request);
055 // exchange.setProperty(HttpConstants.SERVLET_RESPONSE, response);
056 // exchange.setIn(new HttpMessage(exchange, request));
057 // boolean sync = consumer.getAsyncProcessor().process(exchange, new AsyncCallback() {
058 // public void done(boolean sync) {
059 // if (sync) {
060 // return;
061 // }
062 // continuation.setObject(exchange);
063 // continuation.resume();
064 // }
065 //});
066
067 //if (!sync) {
068 // Wait for the exchange to get processed.
069 // This might block until it completes or it might return via an exception and
070 // then this method is re-invoked once the the exchange has finished processing
071 // continuation.suspend(0);
072 //}
073
074 // HC: The getBinding() is interesting because it illustrates the
075 // impedance miss-match between HTTP's stream oriented protocol, and
076 // Camels more message oriented protocol exchanges.
077
078 // now lets output to the response
079 //consumer.getBinding().writeResponse(exchange, response);
080 return;
081 }
082
083 if (continuation.isResumed()) {
084 Exchange exchange = (Exchange)continuation.getObject();
085 // now lets output to the response
086 consumer.getBinding().writeResponse(exchange, response);
087 return;
088 }
089 } catch (Exception e) {
090 throw new ServletException(e);
091 }
092 }
093 }