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/*
Wotonomy: OpenStep design patterns for pure Java applications.
Copyright (C) 2003 Intersect Software Corp.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, see http://www.gnu.org
*/
package net.wotonomy.web;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.ObjectStreamClass;
import javax.servlet.http.HttpSession;
/**
* An implementation of WOSessionStore that stores WOSessions
* inside of HttpSessions, to take advantage of the servlet
* containers built-in distribution capabilities.
*
* @author michael@mpowers.net
* @author $Author: cgruber $
* @version $Revision: 905 $
*/
public class WOServletSessionStore extends WOSessionStore
{
private static final String ServletSessionKey = "WOServletSessionStoreKey";
/**
* This implementation currently does nothing and returns null, as we rely on the
* servlet container to dispose of the HttpSession which contains our WOSession.
*/
public WOSession removeSessionWithID(String sessionID)
{
return null;
}
/**
* Returns the WOSession for the specified ID from the store.
* The sessionID parameter is ignored, and the session is removed from
* the store until saveSessionForContext is called.
*/
public WOSession restoreSessionWithID(String sessionID, WORequest aRequest)
{
WOSession result = null;
HttpSession servletSession = aRequest.servletRequest().getSession();
if ( servletSession != null )
{
try
{
result = (WOSession) servletSession.getAttribute( ServletSessionKey );
if ( result != null )
{
// if the servlet's class loader has changed, we need to reload
if ( result.getClass().getClassLoader() !=
WOApplication.application().getClass().getClassLoader() )
{
throw new ClassCastException( result.getClass().toString() );
}
}
}
catch ( ClassCastException exc )
{
// we're having an issue with the container's class loader:
// try serializing and deserializing to see if it is reloaded correctly
try
{
ByteArrayOutputStream bytes = new ByteArrayOutputStream();
ObjectOutputStream output = new ObjectOutputStream( bytes );
Object o = servletSession.getAttribute( ServletSessionKey );
output.writeObject( o );
output.flush();
output.close();
System.out.println(
"WOServletSessionStore: reloaded session with size: " +
bytes.toByteArray().length );
ObjectInputStream input = new CustomObjectInputStream(
new ByteArrayInputStream( bytes.toByteArray() ),
WOApplication.application().getClass().getClassLoader() );
o = input.readObject();
input.close();
// try it again
result = (WOSession) o;
}
catch ( Exception e )
{
e.printStackTrace();
// give up: remove the attribute and allow a new session
servletSession.removeAttribute( ServletSessionKey );
}
}
if ( result != null )
{
servletSession.removeAttribute( ServletSessionKey );
}
}
//System.out.println( "restoreSessionWithID: " + sessionID + " : " + result );
return result;
}
/**
* Places the context's session into the store.
*/
public void saveSessionForContext(WOContext context)
{
//System.out.println( "saveSessionForContext: " + context + " : " + context.session() );
context.request().servletRequest().getSession( true ).setAttribute(
ServletSessionKey, context.session() );
}
/**
* Needed to specify a class loader which may be different that the
* one used to load the ObjectInputStream class.
*/
private static class CustomObjectInputStream extends ObjectInputStream
{
ClassLoader loader;
public CustomObjectInputStream(
InputStream anInputStream, ClassLoader aClassLoader )
throws java.io.IOException, java.io.StreamCorruptedException
{
super( anInputStream );
loader = aClassLoader;
}
protected Class resolveClass(ObjectStreamClass v)
throws IOException, ClassNotFoundException
{
return loader.loadClass( v.getName() );
}
}
}
/*
* $Log$
* Revision 1.2 2006/02/19 01:44:02 cgruber
* Add xmlrpc files
* Remove jclark and replace with dom4j and javax.xml.sax stuff
* Re-work dependencies and imports so it all compiles.
*
* Revision 1.1 2006/02/16 13:22:22 cgruber
* Check in all sources in eclipse-friendly maven-enabled packages.
*
* Revision 1.7 2003/01/22 23:00:32 mpowers
* Now keeping the most recent page around.
*
* Revision 1.6 2003/01/21 17:53:16 mpowers
* Now handling reloading when wotonomy is on the system class path.
*
* Revision 1.5 2003/01/15 19:50:49 mpowers
* Fixed issues with WOSession and Serializable.
* Can now persist sessions between classloaders (hot swap of class impls).
*
* Revision 1.3 2003/01/14 16:05:19 mpowers
* Removed extraneous printlns.
*
* Revision 1.2 2003/01/13 22:25:07 mpowers
* Request-response cycle is working with session and page persistence.
*
* Revision 1.1 2003/01/07 20:48:24 mpowers
* Implemented WOSessionStore and WOServletSessionStore.
*
*
*/
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