I was looking very carefully at fostore, and found myself going in
circles through the code without a good roadmap, like the one in the
presentation that Erik sent.
What I was really interested in doing, besides learning how a JDO
implementation uses a local store like fostore, was to learn how to use
fostore directly in my applications. Found *no* information on that at
all - still can't. So, I had hoped that by understanding the JDO
reference implementation use of fostore, I would be able to utilize
fostore directly. After weeks of sifting through code though I gave up.
The closest I got was that the Netbeans b-tree library is used somehow,
but there is no documentation on that which I can find.
Cheers.
Richard
Craig L Russell wrote:
Hi Richard,
The fostore project at Apache JDO is an implementation that you could
study for insights as to how the various components interact. There's a
separation of an abstract StoreManager responsible for storing data to a
specific datastore, a StateManager responsible for managing the state of
individual instances, and a PersistenceManager whose API is pretty much
defined in the JDO specification.
Regards,
Craig
On Jul 31, 2007, at 3:23 PM, Richard Schilling wrote:
I did realize that the JDO API and the model in the apache code was
just the implementation of the spec. What I'm after is to make sure I
understand what parts of the API (which interfaces) are used by a
specific implementation to cause classes to be committed to the data
store. It looks like the transactions defined in the spec serve this
purpose, but there's so much information I can't be sure.
Thanks ... still getting my head around the JDO spec - I've even read
the JDO book which I have.
Cheers.
Richard
Matthew T. Adams wrote:
Hi Richard,
Apache JDO is the home of the JDO API (the interface & class files of
the
specification) & TCK (the code that tests whether a JDO
implementation is
compliant with the specification); none of the code here actually
writes to
a database*. The reference implementation for JDO 2.0 is JPOX
(www.jpox.org) -- it is an implementation of the JDO 2.0 API. There are
also many other implementations of JDO out there.
HTH,
Matthew
*: There is a legacy reference implementation called FOStore
(pronounced
like "foster") that was used as the JDO 1.0, but I don't think that's
used
much anymore. Others can comment on that.
-----Original Message-----
From: Richard Schilling [mailto:[EMAIL PROTECTED] Sent:
Tuesday, July 31, 2007 10:22 AM
To: [email protected]
Subject: greetings and question about data stores
Greetings. This is my first post to the list.
I would like to know about the code base itself. There is not any
documentation that discusses the structure of the code itself and how
the software interacts with the data store.
Can any one tell me what source code files actually contain the code
that writes to the data store?
Thanks!
Richard Schilling
Craig Russell
Architect, Sun Java Enterprise System http://java.sun.com/products/jdo
408 276-5638 mailto:[EMAIL PROTECTED]
P.S. A good JDO? O, Gasp!
