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From Cédric Damioli <cedric.dami...@anyware-services.com>
Subject Re: Question about event ordering
Date Tue, 07 Feb 2012 20:04:32 GMT
BTW, does someone know why events are actually in the exact reverse order ?
I know the JCR spec states that events could be unordered, but could I 
rely on the fact that Jackrabbit "reverse order" events ?


Le 07/02/2012 20:51, Ingomar Otter a écrit :
> Hi Julian! :-)
> In the meantime I did for once study the JCR spec and figured that the EventIterator
passed into onEvent() in itself is just a fine event bundle demarcation.
> I just reversed the events inside and now I'm good to go.
>> only needed and present in Journaled observation -- are you using that?
> No.
> But only because I discovered it too late ;-)
> Cheers,
>   Ingomar
> Am 07.02.2012 um 19:16 schrieb Julian Reschke:
>> On 2012-02-06 21:01, Ingomar Otter wrote:
>>> Hello,
>>> I am currently building a simple replication between two Jackrabbit instances.
I've started off using (synchronous) Observers/Events but I am facing some challenges due
>>> the (intresting?) event order.
>>> E.g. I add a file (using webdav) I see the following events (in that order):
>>>> PROPERTY_ADDED,2@4376:	/Somefile.png/jcr:content/jcr:data
>>>> PROPERTY_ADDED,1@4377:	/Somefile.png/jcr:content/jcr:mimeType
>>>> PROPERTY_ADDED,7@4378:	/Somefile.png/jcr:content/jcr:primaryType
>>>> PROPERTY_ADDED,5@4379:	/Somefile.png/jcr:content/jcr:lastModified
>>>> PROPERTY_ADDED,5@4380:	/Somefile.png/jcr:created
>>>> NODE_ADDED@4381:			/Somefile.png/jcr:content
>>>> PROPERTY_ADDED,1@4382:	/Somefile.png/jcr:createdBy
>>>> PROPERTY_ADDED,7@4383:	/Somefile.png/jcr:primaryType
>>>> NODE_ADDED@4384			:/Somefile.png
>>> Of course I can not replay the events in that order as some parent nodes may
be missing. I could re-order them but then this would at least require some "unit of work"
demarcation as I operate on stream of events (and thus need to cluster/chunk) the events.
>>> Is there a reason why the events are emitted in 'reverse' order (I would assume
per API the node was created first)?
>>> Is there a way to influence this?
>>> Afaik PERSIST (event bundling) is work-in-progress in unstable, would that be
a candidate as Unit-Of-Work marker?
>> In the meantime I realized that PERSIST events are not in 2.4.0 (but
>> probably could be ported), and also that you may not need them; they are
>> only needed and present in Journaled observation -- are you using that?
>> Best regards, Julian

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