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From Richard Schilling <rschill...@cognitiongroup.biz>
Subject Re: greetings and question about data stores
Date Sat, 04 Aug 2007 06:07:33 GMT
Here is the posting I had way back in March of 2006, which didn't get 
much response - if any at all:


Never did find out the answers to these questions, but this explains 
what I'm up to.

After just looking, I find this on the netbeans site:


This explains MDR, the use of b-tree (which the JDO reference 
implementation uses) in much more detail than I saw in the past.



Richard Schilling

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:rschilling@cognitiongroup.biz] Sent: 
>>> Tuesday, July 31, 2007 10:22 AM
>>> To: jdo-dev@db.apache.org
>>> 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:Craig.Russell@sun.com
> P.S. A good JDO? O, Gasp!

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