/**
* Suspend the connection by blocking the current {@link Thread}
*
* @param action The {@link Action}
* @param req the {@link AtmosphereRequest}
* @param res the {@link AtmosphereResponse}
* @throws java.io.IOException
* @throws javax.servlet.ServletException
*/
protected void suspend(Action action, AtmosphereRequest req, AtmosphereResponse res)
throws IOException, ServletException {
CountDownLatch latch = new CountDownLatch(1);
req.setAttribute(LATCH, latch);
boolean ok = true;
try {
if (action.timeout() != -1) {
ok = latch.await(action.timeout(), TimeUnit.MILLISECONDS);
} else {
latch.await();
}
} catch (InterruptedException ex) {
logger.trace("", ex);
} finally {
if (!ok) {
timedout(req, res);
} else {
if (req.resource() != null) {
AtmosphereResourceImpl.class.cast(req.resource()).cancel();
}
}
}
}
/**
* Invoked by the Tomcat AIO when a Comet request gets detected.
*
* @param req the {@link AtmosphereRequest}
* @param res the {@link AtmosphereResponse}
* @throws java.io.IOException
* @throws javax.servlet.ServletException
*/
public Action service(AtmosphereRequest req, AtmosphereResponse res)
throws IOException, ServletException {
HttpEvent event = (HttpEvent) req.getAttribute(HTTP_EVENT);
// Comet is not enabled.
if (event == null) {
logger.error("HttpEvent is null, JBoss APR Not Properly installed");
throw unableToDetectComet;
}
if (logger.isTraceEnabled()) {
logger.trace("Event Type {} for {}", event.getType(), req.getRequestURL().toString());
}
Action action = null;
// For now, we are just interested in HttpEvent.REA
AtmosphereResource r = req.resource();
if (event.getType() == HttpEvent.EventType.BEGIN) {
action = suspended(req, res);
if (action.type() == Action.TYPE.SUSPEND) {
// Do nothing except setting the times out
try {
if (action.timeout() != -1) {
event.setTimeout((int) action.timeout());
} else {
event.setTimeout(Integer.MAX_VALUE);
}
req.setAttribute(SUSPENDED, true);
} 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) {
close(event);
} else {
close(event);
}
} else if (event.getType() == HttpEvent.EventType.READ) {
// Not implemented
logger.debug("Receiving bytes, unable to process them.");
} else if (event.getType() == HttpEvent.EventType.EOF
|| event.getType() == HttpEvent.EventType.ERROR
|| event.getType() == HttpEvent.EventType.END) {
if (r != null && r.isResumed()) {
AtmosphereResourceImpl.class.cast(req.resource()).cancel();
} else if (req.getAttribute(SUSPENDED) != null && closeConnectionOnInputStream) {
req.setAttribute(SUSPENDED, null);
action = cancelled(req, res);
} else {
close(event);
}
} else if (event.getType() == HttpEvent.EventType.TIMEOUT) {
action = timedout(req, res);
close(event);
}
return action;
}
/**
* Invoked by the Tomcat AIO when a Comet request gets detected.
*
* @param req the {@link AtmosphereRequest}
* @param res the {@link AtmosphereResponse}
* @throws java.io.IOException
* @throws javax.servlet.ServletException
*/
@Override
public Action service(AtmosphereRequest req, AtmosphereResponse res)
throws IOException, ServletException {
CometEvent event = (CometEvent) req.getAttribute(COMET_EVENT);
// Comet is not enabled.
if (event == null) {
throw new IllegalStateException(unableToDetectComet());
}
Action action = null;
// For now, we are just interested in CometEvent.READ
if (event.getEventType() == EventType.BEGIN) {
action = suspended(req, res);
if (action.type() == Action.TYPE.SUSPEND) {
// 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) {
// TODO: Must implement the same functionality using a Scheduler
logger.trace(
"Warning: CometEvent.setTimeout not supported on this Tomcat instance. "
+ " [The Tomcat native connector does not support timeouts on asynchronous I/O.]");
}
req.setAttribute(SUSPENDED, true);
} else if (action.type() == Action.TYPE.RESUME) {
bz51881(event);
} else {
bz51881(event);
}
} else if (event.getEventType() == EventType.READ) {
// Not implemented
} else if (event.getEventSubType() == CometEvent.EventSubType.CLIENT_DISCONNECT) {
if (req.getAttribute(SUSPENDED) != null) {
req.setAttribute(SUSPENDED, null);
action = cancelled(req, res);
}
bz51881(event);
} else if (event.getEventSubType() == CometEvent.EventSubType.TIMEOUT) {
action = timedout(req, res);
bz51881(event);
} else if (event.getEventType() == EventType.ERROR) {
bz51881(event);
} else if (event.getEventType() == EventType.END) {
if (req.resource().isResumed()) {
AtmosphereResourceImpl.class.cast(req.resource()).cancel();
} else if (req.getAttribute(SUSPENDED) != null && closeConnectionOnInputStream) {
req.setAttribute(SUSPENDED, null);
action = cancelled(req, res);
} else {
bz51881(event);
}
}
return action;
}
/** {@inheritDoc} */
public Action service(AtmosphereRequest req, AtmosphereResponse res)
throws IOException, ServletException {
Action action = null;
try {
action = suspended(req, res);
if (action.type() == Action.TYPE.SUSPEND) {
suspend(action, req, res);
} else if (action.type() == Action.TYPE.RESUME) {
CountDownLatch latch = (CountDownLatch) req.getAttribute(LATCH);
if (latch == null || req.getAttribute(AtmosphereResourceImpl.PRE_SUSPEND) == null) {
logger.debug("response wasn't suspended: {}", res);
return action;
}
latch.countDown();
Action nextAction = resumed(req, res);
if (nextAction.type() == Action.TYPE.SUSPEND) {
suspend(action, req, res);
}
}
} finally {
Object event = req.getAttribute(TomcatCometSupport.COMET_EVENT);
if (event != null) {
try {
Class.forName(org.apache.catalina.CometEvent.class.getName());
if (org.apache.catalina.CometEvent.class.isAssignableFrom(event.getClass())) {
org.apache.catalina.CometEvent.class.cast(event).close();
}
} catch (Throwable e) {
logger.trace("", e);
}
try {
Class.forName(org.apache.catalina.comet.CometEvent.class.getName());
if (org.apache.catalina.comet.CometEvent.class.isAssignableFrom(event.getClass())) {
org.apache.catalina.comet.CometEvent.class.cast(event).close();
}
} catch (Throwable e) {
logger.trace("", e);
}
}
try {
event = req.getAttribute(JBossWebCometSupport.HTTP_EVENT);
Class.forName(org.jboss.servlet.http.HttpEvent.class.getName());
if (event != null) {
org.jboss.servlet.http.HttpEvent.class.cast(event).close();
}
} catch (Throwable e) {
logger.trace("", e);
}
}
return action;
}
