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package org.atmosphere.container;
import org.apache.catalina.CometEvent;
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.jboss.servlet.http.HttpEvent;
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 Tomcat AIO.
*
* @author Jeanfrancois Arcand
*/
public class JBossWebCometSupport extends AsynchronousProcessor
implements CometSupport<AtmosphereResourceImpl> {
public final static String HTTP_EVENT = "HttpEvent";
private final static IllegalStateException unableToDetectComet
= new IllegalStateException(unableToDetectComet());
// Client disconnection is broken on Tomcat.
private final ConcurrentLinkedQueue<HttpEvent> resumed
= new ConcurrentLinkedQueue<HttpEvent>();
public JBossWebCometSupport(AtmosphereConfig config) {
super(config);
}
/**
* Invoked by the Tomcat AIO when a Comet request gets detected.
*
* @param req the {@link HttpServletRequest}
* @param res the {@link HttpServletResponse}
* @throws java.io.IOException
* @throws javax.servlet.ServletException
*/
public Action service(HttpServletRequest req, HttpServletResponse res)
throws IOException, ServletException {
HttpEvent event = (HttpEvent) req.getAttribute(HTTP_EVENT);
// Comet is not enabled.
if (event == null) {
throw unableToDetectComet;
}
Action action = null;
// For now, we are just interested in HttpEvent.REA
if (event.getType() == HttpEvent.EventType.BEGIN) {
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
try {
if (action.timeout != -1) {
event.setTimeout((int) action.timeout);
} else {
event.setTimeout(Integer.MAX_VALUE);
}
} catch (UnsupportedOperationException ex) {
// Swallow s Tomcat APR isn't supporting time out
// TODO: Must implement the same functionality using a
// Scheduler
}
} else if (action.type == Action.TYPE.RESUME) {
if (logger.isLoggable(Level.FINE)) {
logger.fine("Resuming " + res);
}
event.close();
} else {
event.close();
}
} else if (event.getType() == HttpEvent.EventType.READ) {
// Not implemente
} else if (event.getType() == HttpEvent.EventType.ERROR) {
event.close();
} else if (event.getType() == HttpEvent.EventType.END) {
if (!resumed.remove(event)) {
if (logger.isLoggable(Level.FINE)) {
logger.fine("Client closed connection " + res);
}
action = cancelled(req, res);
} else {
if (logger.isLoggable(Level.FINE)) {
logger.fine("Cancelling " + res);
}
}
event.close();
} else if (event.getType() == HttpEvent.EventType.TIMEOUT) {
if (logger.isLoggable(Level.FINE)) {
logger.fine("Timing out " + res);
}
action = timedout(req, res);
event.close();
}
return action;
}
@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) {
HttpEvent event = (HttpEvent) req.getAttribute(HTTP_EVENT);
if (event == null) return action;
resumed.offer(event);
event.close();
}
return action;
}
/**
* {@inheritDoc}
*/
@Override
public void action(AtmosphereResourceImpl actionEvent) {
super.action(actionEvent);
if (actionEvent.action().type == Action.TYPE.RESUME && actionEvent.isInScope()) {
try {
HttpEvent event = (HttpEvent) actionEvent.getRequest().getAttribute(HTTP_EVENT);
resumed.offer(event);
// Resume without closing the underlying suspended connection.
if (config.getInitParameter(AtmosphereServlet.RESUME_AND_KEEPALIVE) == null
|| config.getInitParameter(AtmosphereServlet.RESUME_AND_KEEPALIVE).equalsIgnoreCase("false")) {
event.close();
}
} catch (IOException ex) {
if (logger.isLoggable(Level.FINE)) {
logger.log(Level.FINE, "", ex);
}
}
}
}
/**
* Tomcat was unable to detect Atmosphere's CometProcessor implementation.
*
* @return an error message describing how to fix the issue.
*/
private static String unableToDetectComet() {
StringBuilder sb = new StringBuilder();
sb.append("JBoss failed to detect this is a Comet application because the APR Connector is not enabled. ");
sb.append("\nMake sure atmosphere-compat-jboss.jar is not under your WEB-INF/lib and ");
sb.append("\nthere is no context.xml under WEB-INF");
return sb.toString();
}
}