/**
* 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.camel.component.jetty;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.camel.AsyncCallback;
import org.apache.camel.component.http.CamelServlet;
import org.apache.camel.component.http.HttpConsumer;
import org.apache.camel.component.http.HttpExchange;
import org.mortbay.util.ajax.Continuation;
import org.mortbay.util.ajax.ContinuationSupport;
/**
* @version $Revision: 718246 $
*/
public class CamelContinuationServlet extends CamelServlet {
private static final long serialVersionUID = 1L;
@Override
protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
try {
// Is there a consumer registered for the request.
HttpConsumer consumer = resolve(request);
if (consumer == null) {
response.sendError(HttpServletResponse.SC_NOT_FOUND);
return;
}
final Continuation continuation = ContinuationSupport.getContinuation(request, null);
if (continuation.isNew()) {
// Have the camel process the HTTP exchange.
final HttpExchange exchange = new HttpExchange(consumer.getEndpoint(), request, response);
boolean sync = consumer.getAsyncProcessor().process(exchange, new AsyncCallback() {
public void done(boolean sync) {
if (sync) {
return;
}
continuation.setObject(exchange);
continuation.resume();
}
});
if (!sync) {
// Wait for the exchange to get processed.
// This might block until it completes or it might return via an exception and
// then this method is re-invoked once the the exchange has finished processing
continuation.suspend(0);
}
// HC: The getBinding() is interesting because it illustrates the
// impedance miss-match between HTTP's stream oriented protocol, and
// Camels more message oriented protocol exchanges.
// now lets output to the response
consumer.getBinding().writeResponse(exchange, response);
return;
}
if (continuation.isResumed()) {
HttpExchange exchange = (HttpExchange)continuation.getObject();
// now lets output to the response
consumer.getBinding().writeResponse(exchange, response);
return;
}
} catch (Exception e) {
throw new ServletException(e);
}
}
}