[Kde-pim] Akonadi Nepomuk Email Searching

[Volker Krause]

Hi Vishesh,

sorry, missed your question about the change notifications in persistent 
search collections on IRC last night.

Currently the Akonadi server doesn't know if someone is monitoring a specific 
collection, the filtering happens purely on the client side.

That's obviously not optimal, even without considering Nepomuk. Therefore 
Michael Jansen added the necessary interfaces for server-side filtering of 
change notifications some time ago. We still don't actually filter though, 
that part is still missing.

However, as soon as KMail is running, someone would be watching these folders. 
How expensive is that?

regards,
Volker

On Sunday 09 December 2012 00:13:48 Andras Mantia wrote:
> Hi,
> 
> Vishesh Handa wrote:
> > Hey Laurent
> > 
> > Over the last couple of weeks, I've slowly started learning more about
> > Akonadi, and I've started using it. The good/bad news is that I have
> > started experiencing all the issues people complain about, so hopefully I
> > can fix them.
> > 
> > I tried to search for an email using kmail, and it worked out fine.
> > However, I notice that kmail remembers some of the searches that were
> > performed. I know it uses the QueryServiceClient for this, I however
> > cannot find the relevant code. Could you perhaps point me towards it?
> > 
> > The way the QueryServiceClient is used is bad, cause we (Nepomuk) land up
> > re-running the query each time an email is indexed. That makes virtuoso
> > consume more cpu.
> 
> I'm not that familiar with the searches, but by looking at the code:
> - when a search performed a virtual collection is created with the search
> query
> - this is done using Akonadi::SearchCreateJob
> (kdepimlibs/akonadi/searchcreatejon.cpp)
> - the above triggers the virtual collection creation in the Akonadi server.
> See akonadi/server/src/handler/searchpersistent.cpp
> - when a search is performed inside Akonadi, it goes through the
> akonadi/server/src/handler/search.cpp. That uses a class called
> NepomukSearch that uses the QueryServiceClient you mentioned.
> 
> What I don't know is how/when the virtual collection's content is updated.
> 
> I hope this gives you some clue where to look for the code your searching
> for.
> 
> Andras
> _______________________________________________
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