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//
// ========================================================================
// 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.lang.reflect.Constructor;
import javax.servlet.ServletRequest;
import javax.servlet.ServletRequestWrapper;
import javax.servlet.ServletResponse;
/**
* ContinuationSupport.
*
* Factory class for accessing Continuation instances, which with either be
* a servlet 3.0 or a faux continuation.
*/
public class ContinuationSupport
{
static final boolean __servlet3;
static final Class<?> __waitingContinuation;
static final Constructor<? extends Continuation> __newServlet3Continuation;
static
{
boolean servlet3Support=false;
Constructor<? extends Continuation>s3cc=null;
try
{
boolean servlet3=ServletRequest.class.getMethod("startAsync")!=null;
if (servlet3)
{
Class<? extends Continuation> s3c = ContinuationSupport.class.getClassLoader().loadClass("org.eclipse.jetty.continuation.Servlet3Continuation").asSubclass(Continuation.class);
s3cc=s3c.getConstructor(ServletRequest.class);
servlet3Support=true;
}
}
catch (Exception e)
{}
finally
{
__servlet3=servlet3Support;
__newServlet3Continuation=s3cc;
}
Class<?> waiting=null;
try
{
waiting=ContinuationSupport.class.getClassLoader().loadClass("org.mortbay.util.ajax.WaitingContinuation");
}
catch (Exception e)
{
}
finally
{
__waitingContinuation=waiting;
}
}
/* ------------------------------------------------------------ */
/**
* Get a Continuation. The type of the Continuation returned may
* vary depending on the container in which the application is
* deployed. It may be an implementation native to the container (eg
* org.eclipse.jetty.server.AsyncContinuation) or one of the utility
* implementations provided such as an internal <code>FauxContinuation</code>
* or a real implementation like {@link org.eclipse.jetty.continuation.Servlet3Continuation}.
* @param request The request
* @return a Continuation instance
*/
public static Continuation getContinuation(ServletRequest request)
{
Continuation continuation = (Continuation) request.getAttribute(Continuation.ATTRIBUTE);
if (continuation!=null)
return continuation;
while (request instanceof ServletRequestWrapper)
request=((ServletRequestWrapper)request).getRequest();
if (__servlet3 )
{
try
{
continuation=__newServlet3Continuation.newInstance(request);
request.setAttribute(Continuation.ATTRIBUTE,continuation);
return continuation;
}
catch(Exception e)
{
throw new RuntimeException(e);
}
}
throw new IllegalStateException("!(Jetty || Servlet 3.0 || ContinuationFilter)");
}
/* ------------------------------------------------------------ */
/**
* @param request the servlet request
* @param response the servlet response
* @deprecated use {@link #getContinuation(ServletRequest)}
* @return the continuation
*/
@Deprecated
public static Continuation getContinuation(final ServletRequest request, final ServletResponse response)
{
return getContinuation(request);
}
}
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