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From Darren Shepherd <>
Subject Re: persistence layer
Date Thu, 21 Nov 2013 06:03:02 GMT
I've done a lot of analysis on the data access layer, but just haven't had time to put together
a discuss/recommendation.  In the end I'd propose we move to jOOQ.  It's an excellent framework
that will be very natural to the style of data access that CloudStack uses and we can slowly
migrate to it.  I've hacked up some code and proven that I can get the two frameworks to seamlessly
interoperate.  So you can select from a custom DAO and commit with jOOQ or vice versa.  Additionally
jOOQ will work with the existing pojos we have today.  

Check out jOOQ and let me know what you think of it.  I know for most people the immediate
thought would be to move to JPA, but the way we managed "session" is completely incompatible
with JPA and will require constant merging.  Additionally mixing our custom DAO framework
with a JPA solution looks darn near impossible. 


> On Nov 11, 2013, at 8:33 PM, Laszlo Hornyak <> wrote:
> Hi,
> What are the general directions with the persistence system?
> What I know about it is:
> - It works with JPA (javax.persistence) annotations
> - But rather than integrating a general JPA implementation such us
> hibernate, eclipselink or OpenJPA it uses its own query generator and DAO
> classes to generate SQL statements.
> Questions:
> - Are you planing to use JPA? What is the motivation behind the custom DAO
> system?
> - There are some capabilities in the DAO system that are not used. Should
> these capabilities be maintained or is it ok to remove the support for
> unused features in small steps?
> -- 

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