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.apache.camel.component.http.HttpMessage;
029 import org.mortbay.util.ajax.Continuation;
030 import org.mortbay.util.ajax.ContinuationSupport;
031
032 /**
033 * @version $Revision: 787384 $
034 */
035 public class CamelContinuationServlet extends CamelServlet {
036
037 // TODO: should use the new Async API and allow end users to define if they want Jetty continuation support or not
038
039 private static final long serialVersionUID = 1L;
040
041 public CamelContinuationServlet(boolean matchOnUriPrefix) {
042 super(matchOnUriPrefix);
043 }
044
045 @Override
046 protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
047 try {
048 // Is there a consumer registered for the request.
049 HttpConsumer consumer = resolve(request);
050 if (consumer == null) {
051 response.sendError(HttpServletResponse.SC_NOT_FOUND);
052 return;
053 }
054
055 final Continuation continuation = ContinuationSupport.getContinuation(request, null);
056 if (continuation.isNew()) {
057 // Have the camel process the HTTP exchange.
058 // final DefaultExchange exchange = new DefaultExchange(consumer.getEndpoint(), ExchangePattern.InOut);
059 // exchange.setProperty(HttpConstants.SERVLET_REQUEST, request);
060 // exchange.setProperty(HttpConstants.SERVLET_RESPONSE, response);
061 // exchange.setIn(new HttpMessage(exchange, request));
062 // boolean sync = consumer.getAsyncProcessor().process(exchange, new AsyncCallback() {
063 // public void done(boolean sync) {
064 // if (sync) {
065 // return;
066 // }
067 // continuation.setObject(exchange);
068 // continuation.resume();
069 // }
070 //});
071
072 //if (!sync) {
073 // Wait for the exchange to get processed.
074 // This might block until it completes or it might return via an exception and
075 // then this method is re-invoked once the the exchange has finished processing
076 // continuation.suspend(0);
077 //}
078
079 // HC: The getBinding() is interesting because it illustrates the
080 // impedance miss-match between HTTP's stream oriented protocol, and
081 // Camels more message oriented protocol exchanges.
082
083 // now lets output to the response
084 //consumer.getBinding().writeResponse(exchange, response);
085 return;
086 }
087
088 if (continuation.isResumed()) {
089 Exchange exchange = (Exchange)continuation.getObject();
090 // now lets output to the response
091 consumer.getBinding().writeResponse(exchange, response);
092 return;
093 }
094 } catch (Exception e) {
095 throw new ServletException(e);
096 }
097 }
098 }