/**
* 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.Exchange;
import org.apache.camel.ExchangePattern;
import org.apache.camel.component.http.CamelServlet;
import org.apache.camel.component.http.HttpConsumer;
import org.apache.camel.component.http.HttpMessage;
import org.apache.camel.impl.DefaultExchange;
import org.eclipse.jetty.continuation.Continuation;
import org.eclipse.jetty.continuation.ContinuationSupport;
/**
* Currently not in use.
*
* @version $Revision: 957588 $
*/
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;
}
// are we suspended?
if (consumer.isSuspended()) {
response.sendError(HttpServletResponse.SC_SERVICE_UNAVAILABLE);
return;
}
final Continuation continuation = ContinuationSupport.getContinuation(request);
if (continuation.isInitial()) {
// a new request so create an exchange
final Exchange exchange = new DefaultExchange(consumer.getEndpoint(), ExchangePattern.InOut);
if (consumer.getEndpoint().isBridgeEndpoint()) {
exchange.setProperty(Exchange.SKIP_GZIP_ENCODING, Boolean.TRUE);
}
if (consumer.getEndpoint().isDisableStreamCache()) {
exchange.setProperty(Exchange.DISABLE_HTTP_STREAM_CACHE, Boolean.TRUE);
}
exchange.setIn(new HttpMessage(exchange, request, response));
// use the asynchronous API to process the exchange
boolean sync = consumer.getAsyncProcessor().process(exchange, new AsyncCallback() {
public void done(boolean doneSync) {
// we only have to handle async completion
if (doneSync) {
return;
}
// we should resume the continuation now that we are done asynchronously
if (log.isTraceEnabled()) {
log.trace("Resuming continuation of exchangeId: " + exchange.getExchangeId());
}
continuation.setAttribute("CamelExchange", 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
if (log.isTraceEnabled()) {
log.trace("Suspending continuation of exchangeId: " + exchange.getExchangeId());
}
continuation.suspend(response);
return;
}
// now lets output to the response
if (log.isTraceEnabled()) {
log.trace("Writing response of exchangeId: " + exchange.getExchangeId());
}
consumer.getBinding().writeResponse(exchange, response);
return;
}
if (continuation.isResumed()) {
Exchange exchange = (Exchange) continuation.getAttribute("CamelExchange");
if (log.isTraceEnabled()) {
log.trace("Resuming continuation of exchangeId: " + exchange.getExchangeId());
}
// now lets output to the response
if (log.isTraceEnabled()) {
log.trace("Writing response of exchangeId: " + exchange.getExchangeId());
}
consumer.getBinding().writeResponse(exchange, response);
return;
}
} catch (Exception e) {
log.error("Error processing request", e);
throw new ServletException(e);
}
}
}