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Posted to dev@openjpa.apache.org by Abe White <ab...@oracle.com> on 2008/08/15 17:50:22 UTC

Re: _impl and _fieldImpl in PCDataImpl class, are these 2 fields ever used ?

_impl and _fieldImpl are space for implementations to store
impl-specific data about the object or its fields.  I don't recall
whether Kodo/OpenJPA currently uses this feature.  Custom mappings
might.

On Thu, 2008-08-14 at 13:36 -0700, catalina wei wrote:
> Hi all,
> In order to develop a DataCache plugins of our own, we need to understand
> the 2 fields in the PCDataImpl.java, _impl and _fieldImpl:
>     private Object _impl = null;
>     private Object[] _fieldImpl = null;
> 
> Under the debugger with the DataCache enabled, I have not seen these 2
> fields  ever set.

Re: _impl and _fieldImpl in PCDataImpl class, are these 2 fields ever used ?

Posted by Pinaki Poddar <pp...@apache.org>.

If these fields are counterparts of StateManager's ability to store
implementation-specific data per-field basis, then please note that Slice
uses these slots in StateManager to store the original slice index from
where a particular instance is originally loaded.


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