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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.eclipse.jetty.continuation.Continuation;
import org.eclipse.jetty.continuation.ContinuationSupport;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.lang.IllegalStateException;
import java.util.concurrent.ConcurrentLinkedQueue;
/**
* 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);
private final ConcurrentLinkedQueue<Continuation> resumed = new ConcurrentLinkedQueue<Continuation>();
public Jetty7CometSupport(AtmosphereConfig config) {
super(config);
}
/**
* {@inheritDoc}
*/
public Action service(HttpServletRequest req, HttpServletResponse res) throws IOException, ServletException {
Action action = null;
Continuation c = ContinuationSupport.getContinuation(req);
if (c.isInitial()) {
action = suspended(req, res);
if (action.type == Action.TYPE.SUSPEND) {
logger.debug("Suspending {}", res);
// Do nothing except setting the times out
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.suspend();
}
else if (action.type == Action.TYPE.RESUME) {
logger.debug("Resume {}", res);
if (!resumed.remove(c)) {
try {
c.complete();
}
catch (IllegalStateException ex) {
logger.debug("Continuation.complete()", ex);
}
finally {
resumed(req, res);
}
}
}
}
else if (!c.isInitial() && c.isExpired()) {
timedout(req, res);
}
return action;
}
/**
* {@inheritDoc}
*/
@Override
public void action(AtmosphereResourceImpl actionEvent) {
super.action(actionEvent);
if (actionEvent.isInScope() && actionEvent.action().type == Action.TYPE.RESUME &&
(config.getInitParameter(AtmosphereServlet.RESUME_AND_KEEPALIVE) == null ||
config.getInitParameter(AtmosphereServlet.RESUME_AND_KEEPALIVE).equalsIgnoreCase("false"))) {
Continuation c = ContinuationSupport.getContinuation(actionEvent.getRequest());
try {
c.complete();
}
catch (IllegalStateException ex) {
logger.debug("Continuation.complete() failed", ex);
}
finally {
resumed.offer(c);
}
}
else {
try {
actionEvent.getResponse().flushBuffer();
}
catch (IOException e) {
}
}
}
}