Re: JPEG thumbnailing latency

[Frederic Crozat <fcrozat mandriva com>]

Le samedi 31 mai 2008 à 07:28 +0200, Vitezslav Kotrla a écrit :
> I may have finally solved one of thumbnailing mysteries I've met in
> nautilus 2.22:
> 
> While working with ufraw I've noticed that exported JPEG files got only
> generic 'image' type icon, not proper thumbnail. When I accidentally
> renamed one such file, it was instantly re-thumbnailed, this time
> correctly.
> 
> It looks like ufraw creates empty JPEG file when conversion begins and
> it takes some time while data are finally written. In the meantime
> nautilus fails to thumbnail an empty file, so generic image filetype
> icon is assigned.
> 
> Also enfuse works this way - it creates empty JPEG file first and starts
> writing output data later (20 seconds during my simple test, but of
> course even later depending on the workload).
> 
> I wonder what is the proper solution?

I'd say : if thumbnailing fails initially and if file is still open,
monitor file close for writing and then, regenerate thumbnail.

I know inotify supports this ( IN_CLOSE_WRITE ) but I don't know if this
kind of granularity is available in gvfs..

-- 
Frederic Crozat <fcrozat mandriva com>
Mandriva