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From Rahul Thakur <rahul.thakur.x...@gmail.com>
Subject Re: Some continuum-jpa branch updates
Date Wed, 16 Jan 2008 22:30:33 GMT

Just wondering if anyone else got to the changes?


Emmanuel Venisse wrote:
> I don't have the time to look at it these days but I'll do it asap 
> (maybe in few weeks :( )
>
> Emmanuel
>
> Rahul Thakur a écrit :
>> Hi All,
>>
>> Scribbling some quick notes on some of the toying around I have been
>> doing with OpenJPA, Generics etc on the continuum-jpa branch[1]:
>>
>> 1) Use JPA for persistence
>> Motivation behind this has been to investigate how this compares to
>> JPOX/JDO for managing the model - both in terms on performance and
>> ease of use (Store APIs). Continuum model classes are annotated with
>> JPA annotations on the branch. However, this needs a review as there
>> are some elements (for example 'configuration' typed as Map) that I am
>> not sure yet how to persist yet. The provider used is OpenJPA [2].
>>
>> 2) Refactorings to Store interface
>> Main motivation has been to keep the core Store interface lean and
>> mean (read extensible). The Store interface[3] now has 4 methods:
>> lookup()
>> save()
>> delete()
>> query()
>>
>> The lookup(), save() and delete() act on single model Entity, while
>> query() will filter and obtain matching Entities from the underlying
>> database based on the Query specified. Query implementations control
>> how a resulting JPQL gets constructed and which matching entities get
>> pulled, and can be easily extended.
>>
>> To preserve compatibility with the existing Store interface, we can
>> mimick the existing ContinuumStore interface operations by having a
>> facade that can prepare requisite queries and delegate to a Store
>> instance.
>>
>> 3) Misc.
>> There are a few I am investigating:
>> 1) Spring/Guice under the hood.
>> 2) JUnit 4.4 (and Hamcrest library)
>> , but these are still in early stages.
>>
>> I am keen to get a feedback on what others think.
>>
>> Cheers,
>>
>> Rahul
>>
>>
>> [1] - 
>> http://svn.apache.org/repos/asf/maven/continuum/branches/continuum-jpa/
>>
>> [2] - http://openjpa.apache.org/
>>
>> [3] - 
>> http://svn.apache.org/repos/asf/maven/continuum/branches/continuum-jpa/continuum-model-jpa/src/main/java/org/apache/maven/continuum/store/api/Store.java

>>
>>
>>
>

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