/*
* 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.eclipse.jetty.continuation.Continuation;
import org.eclipse.jetty.continuation.ContinuationListener;
import org.eclipse.jetty.continuation.ContinuationSupport;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import java.io.IOException;
/**
* Comet Portable Runtime implementation on top of Jetty's Continuation.
*
* @author Jeanfrancois Arcand
*/
public class Jetty7CometSupport extends AsynchronousProcessor {
private static final Logger logger = LoggerFactory.getLogger(Jetty7CometSupport.class);
public Jetty7CometSupport(AtmosphereConfig config) {
super(config);
}
@Override
public Action service(final AtmosphereRequest req, final AtmosphereResponse res) throws IOException, ServletException {
Action action = null;
Continuation c = (Continuation) req.getAttribute(Continuation.class.getName());
if (c == null || c.isInitial()) {
action = suspended(req, res);
if (action.type() == Action.TYPE.SUSPEND && req.getAttribute(FrameworkConfig.CANCEL_SUSPEND_OPERATION) == null) {
c = getContinuation(req);
req.setAttribute(Continuation.class.getName(), c);
if (action.timeout() != -1) {
c.setTimeout(action.timeout());
} else {
// Jetty 7 does something really weird if you set it to
// Long.MAX_VALUE, which is to resume automatically.
c.setTimeout(Integer.MAX_VALUE);
}
c.setAttribute(FrameworkConfig.ATMOSPHERE_RESOURCE, req.getAttribute(FrameworkConfig.ATMOSPHERE_RESOURCE));
c.addContinuationListener(new ContinuationListener() {
@Override
public void onComplete(Continuation continuation) {
AtmosphereResourceImpl r = (AtmosphereResourceImpl) req.getAttribute(FrameworkConfig.ATMOSPHERE_RESOURCE);
if (r != null) {
try {
r.cancel();
} catch (IOException e) {
}
}
}
@Override
public void onTimeout(Continuation continuation) {
AtmosphereResourceImpl r = (AtmosphereResourceImpl) req.getAttribute(FrameworkConfig.ATMOSPHERE_RESOURCE);
if (r != null) {
try {
timedout(r.getRequest(), r.getResponse());
} catch (Throwable t) {
logger.error("", t);
}
} else {
logger.trace("AtmosphereResource was null");
}
try {
continuation.complete();
} catch (Throwable t) {
}
}
});
if (req.getAttribute(FrameworkConfig.ATMOSPHERE_RESOURCE) != null) {
c.suspend(res);
}
} else if (action.type() == Action.TYPE.RESUME) {
// If resume occurs during a suspend operation, stop processing.
Boolean resumeOnBroadcast = (Boolean) req.getAttribute(ApplicationConfig.RESUME_ON_BROADCAST);
if (resumeOnBroadcast != null && resumeOnBroadcast) {
return action;
}
c = (Continuation) req.getAttribute(Continuation.class.getName());
if (c != null) {
if (c.isSuspended()) {
try {
c.complete();
} catch (IllegalStateException ex) {
logger.trace("Continuation.complete()", ex);
} finally {
resumed(req, res);
}
}
}
}
}
return action;
}
protected Continuation getContinuation(AtmosphereRequest req) {
return ContinuationSupport.getContinuation(req);
}
@Override
public void action(AtmosphereResourceImpl r) {
super.action(r);
complete(r);
}
@Override
public AsyncSupport complete(AtmosphereResourceImpl r) {
ServletRequest request = r.getRequest(false);
while (request != null) {
Continuation c = (Continuation) request.getAttribute(Continuation.class.getName());
if (c != null) {
try {
if (c.isSuspended()) {
c.complete();
}
} catch (IllegalStateException ex) {
logger.trace("c.complete()", ex);
} finally {
r.getRequest(false).setAttribute(FrameworkConfig.CANCEL_SUSPEND_OPERATION, true);
}
request.removeAttribute(Continuation.class.getName());
return this;
} else {
return this;
}
}
return this;
}
}