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From Gadbury <gadb...@googlemail.com>
Subject RE: User Managed Transactions...
Date Tue, 28 Jul 2009 17:01:34 GMT

I'm confused - please excuse me for being a novice.  All of my repository
read / write code uses Interfaces form javax.jcr.* imports.  So I am
importing the JCR spec Interfaces... but where is the Jackrabbit
implementation?  I assume there is some magic that I cannot comprehend going
on behind the scenes, driven by the Jackrabbit configuration file.

Just as a sanity check, would someone be kind enough to have a look at some
of my sample code?  I pasted it up here:


I just want to be sure that I am doing things right (and using Jackrabbit
properly!) :D

Thanks again for you time!



Vijay Pandey wrote:
> JCR (http://jcp.org/aboutJava/communityprocess/final/jsr170/index.html) is
> the spec (99% java interfaces, may be few abstract/final classes along
> with
> exceptions -- that’s what spec is all about -- it doesn’t provide any
> implementation) while JackRabbit is one of its implementation. So when you
> are using Jackrabbit -- you should be fine with UUID's (the way you are
> using it) as mentioned by Alex. If you think you will be replacing
> Jackrabbit in future with some other JCR implementation then you need to
> be
> careful while using the additional/advances features from that
> implementation, in your case Jackrabbit.
> Thanks
> Vijay
> -----Original Message-----
> From: Gadbury [mailto:gadbury@googlemail.com] 
> Sent: Tuesday, July 28, 2009 11:06 AM
> To: users@jackrabbit.apache.org
> Subject: Re: User Managed Transactions...
> Thank you for the clarification Alex, and for adding the info to the Wiki.
> I am using Jackrabbit 1.4 - does it still apply?
> When you mention 'in Jackrabbit', do you mean when using Jackrabbit
> implementations such as org.apache.jackrabbit.core.SessionImpl and
> org.apache.jackrabbit.core.NodeImpl , rather than the core JCR?
> I must admit the only Jackrabbit I am currently using is the
> configuration,
> registration of custom node types and registration / unregistration of the
> repository in JNDI.
> Should I be replacing all of my JCR with Jackrabbit?  I'd like to be sure
> that I am using Jackrabbit to ensure UUIDs are already assigned when the
> node is created and don't change upon save.
> Can JCR and Jackrabbit be interchanged?  i.e. could I use a Jackrabbit
> PropertyImpl with a JCR Node?
> Sorry for the silly questions!
> Kind regards,
> James
> Alexander Klimetschek wrote:
>> On Tue, Jul 28, 2009 at 4:51 PM, Gadbury<gadbury@googlemail.com> wrote:
>>> If I am within a user managed transaction's scope, and I have added a
>>> node
>>> and then call session.save(), is it safe to rely on that node's UUID or
>>> would I have to wait until the transaction has been committed?
>>> Here is the excerpt from the JCR 1.0 specification:
>>> When UUIDs are Assigned
>>>        In some client-server implementations the assignment of a
>>> permanent UUID
>>> may be done on the server.
>>>        In these cases it is not practical for a newly created
>>> referenceable node
>>> to be given a UUID upon creation.
>>>        Rather, it makes more sense for the UUID to be assigned upon save
>>> of that
>>> node.
>>>        In such cases a “dummy UUID” may be assigned on creation of a new
>>> node
>>> while the real UUID assignment takes place later, upon save.
>>>        Applications should not, therefore, rely on the UUID of a node
>>> before that
>>> node is saved for the first time.
>> The spec only talks about creating node vs. save(), but since in case
>> of transactions a tx commit comes after a save(), you can be sure that
>> the "final" UUID is assigned after your save - you don't have to wait
>> for the commit.
>> In Jackrabbit, UUIDs are already assigned when the node is created and
>> don't change upon save. I added this implementation choice item to
>> http://wiki.apache.org/jackrabbit/JcrSpecImplementation
>> Regards,
>> Alex
>> -- 
>> Alexander Klimetschek
>> alexander.klimetschek@day.com
> -- 
> View this message in context:
> http://www.nabble.com/User-Managed-Transactions...-tp24687924p24702610.html
> Sent from the Jackrabbit - Users mailing list archive at Nabble.com.

View this message in context: http://www.nabble.com/User-Managed-Transactions...-tp24687924p24703684.html
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