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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 jakarta.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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