The whole concept of rewriting CPRS in Java gives us the opportunity to look at the notion of a persistence layer versus a true object store.

So far what we've seen are various implementations of persistence layers, such as ESI Objects and Cache. Good persistence layers are obviously key technologies and provide a migration path toward true object stores.

So, I would like to open up some discussion on the matter and hear people's thoughts on the various approaches.

Here's a few good papers on persistence layers (as they apply to Java), which is what the Caché approach and ESI Objects approach has been:

        http://www.ambysoft.com/essays/persistenceLayer.html
        http://www.jpox.org/index.jsp

It is interesting to note that since Caché provides a JDBC driver for it's data store, it is possible to use jpox to persist object data as opposed to Caché Objects.


And here's some links for true object stores:

        http://mdr.netbeans.org/architecture.html
                (see the section on btrees)
        www.csg.is.titech.ac.jp/~chiba/oopsla98/proc/lee.pdf



Thoughts?


Richard Schilling
Cognition Group, Inc.
Seattle, WA



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