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From Craig L Russell <Craig.Russ...@Sun.COM>
Subject Re: Abstract Class Persistence
Date Tue, 31 Jul 2007 00:04:58 GMT
Hi Andy,

Is there a "getting started" building JPOX from source? I downloaded  
Core, Enhancer, and Plugins but the maven goals don't seem to work.

Thanks,

Craig

On Jul 30, 2007, at 1:51 AM, Andy Jefferson wrote:

> Hi Craig,
>
>> The difference between Persistent Interface and Persistent Abstract
>> Class is:
>>
>> 1. interface PIXXX vs. abstract class PACXXX
>> 2. PIXXXImpl implements PIXXX vs. PACXXXImpl extends PACXXX
>> 3. All methods in PIXXX must be properties (corresponding get/set
>> methods) vs. all abstract methods in PACXXX must be properties.
>> 4. PIXXXImpl implements all property methods vs. PACXXXImpl
>> implements all property methods.
>>
>> I think that JPOX has already done the hard part in getting PI to
>> work. The remaining work is "mapping" the concepts of PI to PAC.
>>
>> If you point me in the right direction, I'll try to make a patch  
>> for JPOX.
>
> Ok, if you have time try the following :-
>
> 1. Core/src/java/org/jpox/ObjectManagerImpl.java has the method  
> newInstance().
> This hands off the creation to an "ImplementationCreator".
>
> 2. Enhancer/src/java/org/jpox/enhancer/ImplementationCreatorImpl.java
> It has a TODO at line 71. The processing of interfaces is at line  
> 88 which
> utilises an "ImplementationGenerator".
>
> 3. Enhancer/src/java/org/jpox/enhancer/bcel/ 
> BCELImplementationGenerator.java
> This currently is only set up for interfaces (InterfaceMetaData),  
> so would
> need extending to allow classes (ClassMetaData) - so a new constructor
> perhaps.
>
> ... and if you don't have time then we will get around to it at  
> some point.
>
> Thx
> -- 
> Andy  (Java Persistent Objects - http://www.jpox.org)

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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