/*
* Copyright 2005 Joe Walker
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.directwebremoting.dwrp;
import javax.servlet.http.HttpServletRequest;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.directwebremoting.util.Continuation;
/**
* A Sleeper that works with Grizzly Continuations
* @author Jeanfrancois Arcand [jeanfrancois dot arcand at sun dot com]
*/
public class GrizzlyContinuationSleeper implements Sleeper
{
/**
* @param request The request into which we store this as an attribute
*/
public GrizzlyContinuationSleeper(HttpServletRequest request)
{
continuation = new Continuation(request);
}
/* (non-Javadoc)
* @see org.directwebremoting.dwrp.Sleeper#goToSleep(java.lang.Runnable)
*/
public void goToSleep(Runnable awakening)
{
this.onAwakening = awakening;
try
{
continuation.suspend(-1);
}
catch (Exception ex)
{
Continuation.rethrowIfContinuation(ex);
log.warn("Exception", ex);
proxy = new ThreadWaitSleeper();
proxy.goToSleep(onAwakening);
}
}
/* (non-Javadoc)
* @see org.directwebremoting.dwrp.PollHandler.Sleeper#wakeUp()
*/
public void wakeUp()
{
if (proxy != null)
{
proxy.wakeUp();
}
else
{
synchronized (continuation)
{
if (!resumed)
{
try
{
/*
* Flush bytes if any first as before resuming the
* as Grizzly Comet isn't allowing writes once the
* continuation is resumed.
*
* This can be achieved
* by using Grizzly CometHandler, which isn't exposed
* with DWR.
*/
onAwakening.run();
continuation.resume();
}
catch (Exception ex)
{
log.error("Broken reflection", ex);
}
resumed = true;
}
}
}
}
/**
* If continuations fail, we proxy to a Thread Wait version
*/
protected ThreadWaitSleeper proxy = null;
/**
* What we do when we are woken up
*/
protected Runnable onAwakening;
/**
* The continuation object
*/
protected final Continuation continuation;
/**
* Has the continuation been restarted already?
*/
protected boolean resumed = false;
/**
* We remember the notify conduit so we can reuse it
*/
public static final String ATTRIBUTE_JETTY_CONDUIT = "org.directwebremoting.dwrp.notifyConduit";
private static final Log log = LogFactory.getLog(GrizzlyContinuationSleeper.class);
}