Re: [Exist-open] Notify updates

[Anca G. <anc...@in...>]

Hi,

I managed to install a Java trigger into eXist. Now I have another 
question: is it possible from a Java trigger to know which node in the 
document was updated (and optionally what were the updates)?
If it is, how can I access this information?

Thank you in advance,
Anca

Adam Retter wrote:
> Yes this is entirely possible with Triggers, you could write a Trigger 
> in Java or XQuery and configure it to act on a collection. You would 
> have the Trigger do some sort of out-of-band signalling to your 
> application.
>
> If you wish to continue with just using XML:DB from your application, 
> then perhaps your Trigger should just up date a known xml file in the 
> db with the notification and your application could poll the document 
> via. XML:DB for changes.
>
> However, moving away from XML:DB (which personally would be my 
> choice), then you could have your Trigger send a UDP Packet/HTTP 
> Request or other directly to your app for real-time notification - I 
> think UDP would probably be my choice here if its just for 
> notification - if sending XML about the changes then I would probably 
> fall back to HTTP/XML to your app.
>
> Thanks Adam.
>
>
>
> On 16/04/2008, *Anca Ghitescu* <anc...@in... 
> <mailto:anc...@in...>> wrote:
>
>     Hi,
>
>     I have a Java application that uses eXist db. The db is accessed with
>     XML:DB API.
>     I would like to find a way to notify my application when an update is
>     finished into the database. For example my application has some
>     listeners that subscribe
>     to eXist and when a specified action (e.g. an update) is
>     fulfilled, the
>     listeners are notified.
>
>     Is it possible with triggers in eXist to implement this scenario? Or
>     could you please give me another ideas?
>
>     What happens now is that some data is updated and then, if this
>     data is
>     selected immediately afterwards, sometimes the update is not finished
>     yet and the select returns empty results.
>
>     Thank you in advance
>
>
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>
> -- 
> Adam Retter
>
> eXist Developer
> { England }
> ad...@ex... <mailto:ad...@ex...>
> irc://irc.freenode.net/existdb <http://irc.freenode.net/existdb> 

-- 
Anca Ghitescu, MSc

R&D Engineer - GEMO
INRIA Saclay - Île-de-France

Tél: + 33 1 72 92 59 80