Re: xmltree and mdb

On Sat, 2005-05-07 at 23:54 +0100, David Hough wrote:

[snipped]

> 
> This is great, with a noticeable performance boost when browsing my music  
> collection. I've merged it upstream into zinf--xmltree. At some point I  
> should really merge xmltree back into browsermm/CVS, ah well :)
> 
> I have noticed however, that for certain files the Cache doesn't seem to  
> work. I think this is where the file doesn't have full metadata, so the  
> Cache can't provide all the neccessary data, so it looks at all the other  
> sources again to try and find the extra data.

An unfinished piece.  I'll be using timestamps
to tell whether a metadata source has newer metadata than 
is already provided.  If not, the source is skipped.



> I seem to remember in a previous email, you mentioned filling in the  
> missing data with some default value if it doesn't exist. Perhaps a better  
> way would be to store which metadata sources were searched to provide the  
> cached data (I notice you've made sure that the sources all have names  
> now), and only continue searching if a source hasn't been searched yet.

  Not sure how this will evolve, but some sort of default
should be provided even if no metadata is provided 
(i.e. Artist: Unknown).

> This would provide a generic solution to the problem. So, for instance,  
> data in the "MKDatabase" source could be marked as having cached the  
> source "tags", so when some tags are missing from the database, we know  
> there's no point in looking at the file for them as we already have that  
> data cached.

This brings to me another problem,  currently some tags
should be cached from lower levels and some shouldn't.  Your files tags
cached in mkdatabase is a primce example.  The counter example is 
that storing icon information in the mkdatabase might be a waist (unless
the user wants to associate an icon (thumbnail) with the, say, and
album.


> I can't help but think that this probably overcomplicates things, but I  
> just thought I'd just mention it.
> 
> Cheers,
> David



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