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package org.atmosphere.container;
import org.atmosphere.cpr.AsynchronousProcessor;
import org.atmosphere.cpr.AtmosphereResourceImpl;
import org.atmosphere.cpr.AtmosphereServlet;
import org.atmosphere.cpr.AtmosphereServlet.Action;
import org.atmosphere.cpr.AtmosphereServlet.AtmosphereConfig;
import org.atmosphere.cpr.CometSupport;
import org.mortbay.util.ajax.Continuation;
import org.mortbay.util.ajax.ContinuationSupport;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.concurrent.ConcurrentLinkedQueue;
import java.util.logging.Level;
/**
* Comet Portable Runtime implementation on top of Jetty's Continuation.
*
* @author Jeanfrancois Arcand
*/
public class JettyCometSupport extends AsynchronousProcessor implements CometSupport<AtmosphereResourceImpl> {
private final ConcurrentLinkedQueue<Continuation> resumed = new ConcurrentLinkedQueue<Continuation>();
public JettyCometSupport(AtmosphereConfig config) {
super(config);
}
/**
* {@inheritDoc}
*/
public Action service(HttpServletRequest req, HttpServletResponse res)
throws IOException, ServletException {
Continuation c = ContinuationSupport.getContinuation(req, null);
Action action = null;
if (!c.isResumed() && !c.isPending()) {
// This will throw an exception
action = suspended(req, res);
if (action.type == Action.TYPE.SUSPEND) {
if (logger.isLoggable(Level.FINE)) {
logger.fine("Suspending " + res);
}
// Do nothing except setting the times out
if (action.timeout != -1) {
c.suspend(action.timeout);
} else {
c.suspend(0);
}
}
} else {
if (logger.isLoggable(Level.FINE)) {
logger.fine("Resuming " + res);
}
if (!resumed.remove(c)) {
c.reset();
if (req.getAttribute(AtmosphereServlet.RESUMED_ON_TIMEOUT) == null) {
timedout(req, res);
} else {
resumed(req, res);
}
}
}
return action;
}
/**
* {@inheritDoc}
*/
@Override
public void action(AtmosphereResourceImpl r) {
super.action(r);
if (r.action().type == Action.TYPE.RESUME && r.isInScope()) {
Continuation c = ContinuationSupport.getContinuation(r.getRequest(), null);
resumed.offer(c);
if (config.getInitParameter(AtmosphereServlet.RESUME_AND_KEEPALIVE) == null
|| config.getInitParameter(AtmosphereServlet.RESUME_AND_KEEPALIVE).equalsIgnoreCase("false")) {
c.resume();
} else {
try {
r.getResponse().flushBuffer();
} catch (IOException e) {
}
}
}
}
@Override
public Action cancelled(HttpServletRequest req, HttpServletResponse 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;
}
}