[Nepomuk] [RFC] New File Indexer

Sebastian Trüg sebastian at trueg.de
Tue Sep 11 14:48:32 UTC 2012

I like this.
But I would vote for a plugin system nonetheless. A simple one though. A 
plugin can register for one or more mimetypes and then it simply gets 
the file path and returns a SimpleResourceGraph. You merge all and are 
done. Plugins should never deal with file size, mimetype, or any of 
those basic things the framework can handle.

This means that the first sweep is done without plugins, the second one 
would call the plugins and the third one, well, that could be yet 
another plugin system which does use RDF types instead of mimetypes. For 
example: the TV show plugin handles nfo:Video. The framework thus calls 
the plugin, provides the path and a handle to the existing metadata. The 
plugin can then simply run its filename analysis and continue from there.

OK, one issue we have here is the following: the tv show extractor for 
example works better when run on sets of video files, preferably a whole 
season. Then it only needs to get feedback from the user once or can 
even do its job automatically. This, however, means that third-sweep 
plugins would need an option "can-handle-more-than-one-file-at-a-time".

My 2cents.

On 09/11/2012 04:06 PM, Alex Fiestas wrote:
> I think we've discussed this somewhere but I don't remember the outcome of the
> discussion xD
> I think that would be really interesting to have an indexer that does a 2pass
> strategy.
> First pass will index only basic data such a name, dates, mimetype.
> Second pass will index specific stuff, previews, texts, tags...
> Doing this, we can even add third party "information fetchers" as a 3 pass,
> for example to get information about tv shows and such.
> Let's put an example:
> -New file in my Downlaod folder detected
> -Quick super fast indexer indexs data, name, mimetype
>           From this point, this file is already usable in Nepomuk
> -Second pass, indexing tags, previews
> -Third pass (this can be onDemand via GUI) information from the internetz is
> fetched.
> I got this idea from spotlight (osx indexer metadata thing), the most obvious
> way of seeing this in osx is when a new external storage is plugged, files
> will get indexed super fast but all you will get if you perform a search is
> going ot be filenames, not even mimetypes !
> Cheerz.
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