/*
* Copyright 2014 Jeanfrancois Arcand
*
* Licensed 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.atmosphere.container;
import org.atmosphere.cpr.Action;
import org.atmosphere.cpr.ApplicationConfig;
import org.atmosphere.cpr.AsyncSupport;
import org.atmosphere.cpr.AsynchronousProcessor;
import org.atmosphere.cpr.AtmosphereConfig;
import org.atmosphere.cpr.AtmosphereRequest;
import org.atmosphere.cpr.AtmosphereResourceImpl;
import org.atmosphere.cpr.AtmosphereResponse;
import org.atmosphere.cpr.FrameworkConfig;
import org.mortbay.util.ajax.Continuation;
import org.mortbay.util.ajax.ContinuationSupport;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import javax.servlet.ServletException;
import java.io.IOException;
import java.util.concurrent.ConcurrentLinkedQueue;
import static org.atmosphere.cpr.ApplicationConfig.MAX_INACTIVE;
/**
* Comet Portable Runtime implementation on top of Jetty's Continuation.
*
* @author Jeanfrancois Arcand
*/
public class JettyCometSupport extends AsynchronousProcessor {
private static final Logger logger = LoggerFactory.getLogger(JettyCometSupport.class);
private final ConcurrentLinkedQueue<Continuation> resumed = new ConcurrentLinkedQueue<Continuation>();
public JettyCometSupport(AtmosphereConfig config) {
super(config);
}
@Override
public Action service(AtmosphereRequest req, AtmosphereResponse response)
throws IOException, ServletException {
Continuation c = ContinuationSupport.getContinuation(req, null);
Action action = null;
if (!c.isResumed() && !c.isPending() && req.getAttribute(FrameworkConfig.CANCEL_SUSPEND_OPERATION) == null) {
// This will throw an exception
action = suspended(req, response);
if (action.type() == Action.TYPE.SUSPEND) {
// Do nothing except setting the times out
if (action.timeout() != -1) {
c.suspend(action.timeout());
} else {
c.suspend(0);
}
} else if (action.type() == Action.TYPE.RESUME) {
if (!resumed.remove(c)) {
c.reset();
if (req.getAttribute(ApplicationConfig.RESUMED_ON_TIMEOUT) == null) {
timedout(req, response);
} else {
resumed(req, response);
}
}
}
} else {
if (!resumed.remove(c) && req.getAttribute(FrameworkConfig.CANCEL_SUSPEND_OPERATION) == null) {
c.reset();
if (req.getAttribute(ApplicationConfig.RESUMED_ON_TIMEOUT) == null) {
timedout(req, response);
} else {
resumed(req, response);
}
}
}
return action;
}
@Override
public void action(AtmosphereResourceImpl r) {
super.action(r);
if (r.action().type() == Action.TYPE.RESUME && r.isInScope()) {
Continuation c = ContinuationSupport.getContinuation(r.getRequest(false), null);
resumed.offer(c);
complete(r);
} else {
try {
r.getResponse().flushBuffer();
} catch (IOException e) {
}
}
}
@Override
public AsyncSupport complete(AtmosphereResourceImpl r) {
Continuation c = ContinuationSupport.getContinuation(r.getRequest(false), null);
if (!c.isNew()) {
c.resume();
} else {
r.getRequest().setAttribute(FrameworkConfig.CANCEL_SUSPEND_OPERATION, true);
}
return this;
}
@Override
public Action cancelled(AtmosphereRequest req, AtmosphereResponse res)
throws IOException, ServletException {
Action action = super.cancelled(req, res);
if (req.getAttribute(MAX_INACTIVE) != null && Long.class.cast(req.getAttribute(MAX_INACTIVE)) == -1) {
Continuation c = ContinuationSupport.getContinuation(req, null);
if (c != null) {
c.resume();
}
}
return action;
}
}