Sorry, I am not aware of any current caching solution that has extra information. Basically, I implemented it as a DB semantics copied from the SQL-92 spec. Idea is to provide users a high-level logical view of the locking instead of managing fine-grained node-level one.
I would just focus on the JBoss Cache sites:
1. The wiki - http://wiki.jboss.org/wiki/Wiki.jsp?page=JBossCache
2. The official docs - http://labs.jboss.com/portal/jbosscache/docs/index.html
3. These forums
4. The source code!