org.eclipse.jetty.continuation.Jetty6Continuation Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of ehcache Show documentation
Show all versions of ehcache Show documentation
Ehcache is an open source, standards-based cache used to boost performance,
offload the database and simplify scalability. Ehcache is robust, proven and full-featured and
this has made it the most widely-used Java-based cache.
//
// ========================================================================
// Copyright (c) 1995-2013 Mort Bay Consulting Pty. Ltd.
// ------------------------------------------------------------------------
// All rights reserved. This program and the accompanying materials
// are made available under the terms of the Eclipse Public License v1.0
// and Apache License v2.0 which accompanies this distribution.
//
// The Eclipse Public License is available at
// http://www.eclipse.org/legal/epl-v10.html
//
// The Apache License v2.0 is available at
// http://www.opensource.org/licenses/apache2.0.php
//
// You may elect to redistribute this code under either of these licenses.
// ========================================================================
//
package org.eclipse.jetty.continuation;
import java.util.ArrayList;
import java.util.List;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.ServletResponseWrapper;
import org.mortbay.log.Log;
import org.mortbay.log.Logger;
/* ------------------------------------------------------------ */
/**
* This implementation of Continuation is used by {@link ContinuationSupport}
* when it detects that the application is deployed in a jetty-6 server.
* This continuation requires the {@link ContinuationFilter} to be deployed.
*/
public class Jetty6Continuation implements ContinuationFilter.FilteredContinuation
{
private static final Logger LOG = Log.getLogger(Jetty6Continuation.class.getName());
// Exception reused for all continuations
// Turn on debug in ContinuationFilter to see real stack trace.
private final static ContinuationThrowable __exception = new ContinuationThrowable();
private final ServletRequest _request;
private ServletResponse _response;
private final org.mortbay.util.ajax.Continuation _j6Continuation;
private Throwable _retry;
private int _timeout;
private boolean _initial=true;
private volatile boolean _completed=false;
private volatile boolean _resumed=false;
private volatile boolean _expired=false;
private boolean _responseWrapped=false;
private List _listeners;
public Jetty6Continuation(ServletRequest request, org.mortbay.util.ajax.Continuation continuation)
{
if (!ContinuationFilter._initialized)
{
LOG.warn("!ContinuationFilter installed",null,null);
throw new IllegalStateException("!ContinuationFilter installed");
}
_request=request;
_j6Continuation=continuation;
}
public void addContinuationListener(final ContinuationListener listener)
{
if (_listeners==null)
_listeners=new ArrayList();
_listeners.add(listener);
}
public void complete()
{
synchronized(this)
{
if (_resumed)
throw new IllegalStateException();
_completed=true;
if (_j6Continuation.isPending())
_j6Continuation.resume();
}
}
/* ------------------------------------------------------------ */
/**
* @see org.eclipse.jetty.continuation.Continuation#getAttribute(java.lang.String)
*/
public Object getAttribute(String name)
{
return _request.getAttribute(name);
}
/* ------------------------------------------------------------ */
/**
* @see org.eclipse.jetty.continuation.Continuation#removeAttribute(java.lang.String)
*/
public void removeAttribute(String name)
{
_request.removeAttribute(name);
}
/* ------------------------------------------------------------ */
/**
* @see org.eclipse.jetty.continuation.Continuation#setAttribute(java.lang.String, java.lang.Object)
*/
public void setAttribute(String name, Object attribute)
{
_request.setAttribute(name,attribute);
}
/* ------------------------------------------------------------ */
public ServletResponse getServletResponse()
{
return _response;
}
/* ------------------------------------------------------------ */
public boolean isExpired()
{
return _expired;
}
/* ------------------------------------------------------------ */
public boolean isInitial()
{
return _initial;
}
/* ------------------------------------------------------------ */
public boolean isResumed()
{
return _resumed;
}
/* ------------------------------------------------------------ */
public boolean isSuspended()
{
return _retry!=null;
}
/* ------------------------------------------------------------ */
public void resume()
{
synchronized(this)
{
if (_completed)
throw new IllegalStateException();
_resumed=true;
if (_j6Continuation.isPending())
_j6Continuation.resume();
}
}
/* ------------------------------------------------------------ */
public void setTimeout(long timeoutMs)
{
_timeout=(timeoutMs>Integer.MAX_VALUE)?Integer.MAX_VALUE:(int)timeoutMs;
}
/* ------------------------------------------------------------ */
/**
* @see org.eclipse.jetty.continuation.Continuation#suspend(javax.servlet.ServletResponse)
*/
public void suspend(ServletResponse response)
{
try
{
_response=response;
_responseWrapped=_response instanceof ServletResponseWrapper;
_resumed=false;
_expired=false;
_completed=false;
_j6Continuation.suspend(_timeout);
}
catch(Throwable retry)
{
_retry=retry;
}
}
/* ------------------------------------------------------------ */
public void suspend()
{
try
{
_response=null;
_responseWrapped=false;
_resumed=false;
_expired=false;
_completed=false;
_j6Continuation.suspend(_timeout);
}
catch(Throwable retry)
{
_retry=retry;
}
}
/* ------------------------------------------------------------ */
public boolean isResponseWrapped()
{
return _responseWrapped;
}
/* ------------------------------------------------------------ */
/**
* @see org.eclipse.jetty.continuation.Continuation#undispatch()
*/
public void undispatch()
{
if (isSuspended())
{
if (ContinuationFilter.__debug)
throw new ContinuationThrowable();
throw __exception;
}
throw new IllegalStateException("!suspended");
}
/* ------------------------------------------------------------ */
public boolean enter(ServletResponse response)
{
_response=response;
_expired=!_j6Continuation.isResumed();
if (_initial)
return true;
_j6Continuation.reset();
if (_expired)
{
if (_listeners!=null)
{
for (ContinuationListener l: _listeners)
l.onTimeout(this);
}
}
return !_completed;
}
/* ------------------------------------------------------------ */
public boolean exit()
{
_initial=false;
Throwable th=_retry;
_retry=null;
if (th instanceof Error)
throw (Error)th;
if (th instanceof RuntimeException)
throw (RuntimeException)th;
if (_listeners!=null)
{
for (ContinuationListener l: _listeners)
l.onComplete(this);
}
return true;
}
}