org.eclipse.jetty.continuation.Servlet3Continuation 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) 1995-2014 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.io.IOException;
import java.util.ArrayList;
import java.util.List;
import javax.servlet.AsyncContext;
import javax.servlet.AsyncEvent;
import javax.servlet.AsyncListener;
import javax.servlet.DispatcherType;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.ServletResponseWrapper;
/* ------------------------------------------------------------ */
/**
* This implementation of Continuation is used by {@link ContinuationSupport}
* when it detects that the application has been deployed in a non-jetty Servlet 3
* server.
*/
public class Servlet3Continuation implements Continuation
{
// 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 AsyncContext _context;
private List _listeners=new ArrayList();
private volatile boolean _initial=true;
private volatile boolean _resumed=false;
private volatile boolean _expired=false;
private volatile boolean _responseWrapped=false;
private long _timeoutMs=-1;
/* ------------------------------------------------------------ */
public Servlet3Continuation(ServletRequest request)
{
_request=request;
_listeners.add(new AsyncListener()
{
public void onComplete(AsyncEvent event) throws IOException
{
}
public void onError(AsyncEvent event) throws IOException
{
}
public void onStartAsync(AsyncEvent event) throws IOException
{
event.getAsyncContext().addListener(this);
}
public void onTimeout(AsyncEvent event) throws IOException
{
_initial=false;
event.getAsyncContext().dispatch();
}
});
}
/* ------------------------------------------------------------ */
public void addContinuationListener(final ContinuationListener listener)
{
AsyncListener wrapped = new AsyncListener()
{
public void onComplete(final AsyncEvent event) throws IOException
{
listener.onComplete(Servlet3Continuation.this);
}
public void onError(AsyncEvent event) throws IOException
{
listener.onComplete(Servlet3Continuation.this);
}
public void onStartAsync(AsyncEvent event) throws IOException
{
event.getAsyncContext().addListener(this);
}
public void onTimeout(AsyncEvent event) throws IOException
{
_expired=true;
listener.onTimeout(Servlet3Continuation.this);
}
};
if (_context!=null)
_context.addListener(wrapped);
else
_listeners.add(wrapped);
}
/* ------------------------------------------------------------ */
public void complete()
{
AsyncContext context=_context;
if (context==null)
throw new IllegalStateException();
_context.complete();
}
/* ------------------------------------------------------------ */
public ServletResponse getServletResponse()
{
return _response;
}
/* ------------------------------------------------------------ */
public boolean isExpired()
{
return _expired;
}
/* ------------------------------------------------------------ */
public boolean isInitial()
{
// TODO - this is not perfect if non continuation API is used directly
return _initial&&_request.getDispatcherType()!=DispatcherType.ASYNC;
}
/* ------------------------------------------------------------ */
public boolean isResumed()
{
return _resumed;
}
/* ------------------------------------------------------------ */
public boolean isSuspended()
{
return _request.isAsyncStarted();
}
/* ------------------------------------------------------------ */
public void keepWrappers()
{
_responseWrapped=true;
}
/* ------------------------------------------------------------ */
public void resume()
{
AsyncContext context=_context;
if (context==null)
throw new IllegalStateException();
_resumed=true;
_context.dispatch();
}
/* ------------------------------------------------------------ */
public void setTimeout(long timeoutMs)
{
_timeoutMs=timeoutMs;
if (_context!=null)
_context.setTimeout(timeoutMs);
}
/* ------------------------------------------------------------ */
public void suspend(ServletResponse response)
{
_response=response;
_responseWrapped=response instanceof ServletResponseWrapper;
_resumed=false;
_expired=false;
_context=_request.startAsync();
_context.setTimeout(_timeoutMs);
for (AsyncListener listener:_listeners)
_context.addListener(listener);
_listeners.clear();
}
/* ------------------------------------------------------------ */
public void suspend()
{
_resumed=false;
_expired=false;
_context=_request.startAsync();
_context.setTimeout(_timeoutMs);
for (AsyncListener listener:_listeners)
_context.addListener(listener);
_listeners.clear();
}
/* ------------------------------------------------------------ */
public boolean isResponseWrapped()
{
return _responseWrapped;
}
/* ------------------------------------------------------------ */
/**
* @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);
}
/* ------------------------------------------------------------ */
/**
* @see org.eclipse.jetty.continuation.Continuation#undispatch()
*/
public void undispatch()
{
if (isSuspended())
{
if (ContinuationFilter.__debug)
throw new ContinuationThrowable();
throw __exception;
}
throw new IllegalStateException("!suspended");
}
}