Package org.atmosphere.container

Source Code of org.atmosphere.container.JettyCometSupport

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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.mortbay.util.ajax.Continuation;
import org.mortbay.util.ajax.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.util.concurrent.ConcurrentLinkedQueue;

/**
* 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);
    }

    /**
     * {@inheritDoc}
     */
    public Action service(HttpServletRequest req, HttpServletResponse response)
            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, response);
            if (action.type == Action.TYPE.SUSPEND) {
                logger.debug("Suspending response: {}", response);

                // Do nothing except setting the times out
                if (action.timeout != -1) {
                    c.suspend(action.timeout);
                } else {
                    c.suspend(0);
                }
            }
        } else {
            logger.debug("Resuming response: {}", response);

            if (!resumed.remove(c)) {
                c.reset();

                if (req.getAttribute(AtmosphereServlet.RESUMED_ON_TIMEOUT) == null) {
                    timedout(req, response);
                } else {
                    resumed(req, response);
                }
            }
        }
        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;
    }
}
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