AW: [OJB-developers] High Low Sequence

[Mahler T. <tho...@it...>]

Hi all,

<snip>
> 
> Another possible problem with the SequenceManagerHighLowImpl 
> (and possibly
> the DefaultImpl as well) is that if several PersistenceBroker 
> acessed the
> same DB there could be race conditions, so we'd need to lock 
> the obj_hl_seq
> table (or at least one row). The question is wether it is 
> possible/good
> style to use the ODMG API (which seems the only way to do 
> locking in OJB)
> within a core class. (I've never actually seen such a race 
> condition and
> haven't run any tests, but I once noticed it and there don't 
> seem to be any
> pre-cautions for this; please correct me if I'm wrong).
> 

I think you are right! currently there is no locking on the ojb_hl_seq.
But I think we can use optimistic locking (which is implemented on the PB
level)
to make sequence numbering thread and multi-user safe.

Thomas

> > Regards Rainer
> 
> regards
> Joachim Sauer
> 
> 
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