Re: Concurrent Updates

[Alexander Klimetschek <ak...@adobe.com>]

On 15.07.11 23:09, "ChadDavis" <ch...@gmail.com> wrote:
>I'm not familiar with the transaction API for the JCR, but it's
>covered in the specification.  The Session doesn't write any of it's
>changes until you session.save().  Transactions are something more
>than this.

Session.save() is transactional in itself. The support of Java
transactions in JCR is only needed when you need to want 2-phase-commit
involving a totally different persistence mechanism.

Regards,
Alex

-- 
Alexander Klimetschek
Developer // Adobe (Day) // Berlin - Basel

Re: Concurrent Updates

[David Buchmann <da...@liip.ch>]

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Am 07.08.2011 22:06, schrieb Alexander Klimetschek:
> On 15.07.11 23:09, "ChadDavis" <ch...@gmail.com> wrote:
>> I'm not familiar with the transaction API for the JCR, but it's
>> covered in the specification.  The Session doesn't write any of it's
>> changes until you session.save().  Transactions are something more
>> than this.
> 
> Session.save() is transactional in itself. The support of Java
> transactions in JCR is only needed when you need to want 2-phase-commit
> involving a totally different persistence mechanism.

just to be sure i did not misunderstand transactions, is this true?

when doing a transaction, you can do several session.save() and any of
the immediate-write workspace operations without the changes becoming
visible to other sessions until you commit - or you can discard all of
that in a rollback.


i think the original question is not answered: what happens with
concurrent updates? i would assume the proper way to prevent accidents
is with locking:
http://www.day.com/specs/jcr/2.0/17_Locking.html

cheers,david

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