[Objectbridge-jdo-dev] Re: OJB - JDO Reference Enhancer

[Mika R. <mri...@ya...>]

> In fact we already have a working JDO prototype
> implementation !

Sounds great.

> just curious: why do you use Jiapi instead of the
> defact-standard BCEL?

As a matter of fact,we are using BCEL. Jiapi is based
on BCEL. We started Jiapi project allmost a year
ago. With prototyping with BCEL.
Jiapi provides greater level of abstraction than
BCEL. With Jiapi, you do not talk about ConstantPool
and all those low-level stuff. 
Jiapi is more like Read-Write reflection API. And
it utilizes BCEL to do all the wiring needed.
There is also a framework for instrumenting
classes. Framework is implemented as filter design
pattern.

> What exactly is your enhancer doing? is it
> generating the same things as 
> the JDORI enhancer?

Yes. Take a look at PersistenCapableTemplate:
http://cvs.sourceforge.net/cgi-bin/viewcvs.cgi/jadoe/jadoe/src/alt/jadoe/PersistenceCapableTemplate.java?rev=1.3&content-type=text/vnd.viewcvs-markup

Methods/fields in this class gets copied into
enhanced class. There are some methods, that will
have to be added by other means, and these are 
missing.

The things we will do with Jadoe:
a) Finalize missing field/method generation.
b) Provide a way to interface with the enhancer.
We are running Jadoe from command line, and it will
dump modified classes into filesystem. So that we
can easily inspect them.
c) Consider adding MBean interface for enhanced
classes. This would naturally be an option.

- Mika Riekkinen -


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