On Sat, May 31, 2014 at 3:38 PM, Jody Garnett <[email protected]>
wrote:
> Given that clients might also want to follow the link and get the legend
>> graphics, this could
>> be coupled with a dispatcher callback that intercepts the legend graphic
>> request and if it
>> matches the one used to generate the PNG file, we could just shortcut and
>> return the file on disk, getting some caching benefit
>>
>
> I was more thinking the GetCapabilities document could provide a URL
> straight to those generated images. The GetCapabilities document is
> supposed to link to a URL, nothing says that URL has to be a
> GetLegendGraphic request (especially since GetLegendGraphics is an
> optional operation).
>
That would work as well, but we don't have a way to publish specific files
out of the data dir, only full folders, so we'd have to somehow
pimp up the FilePublisher, making it filter-able.
Plus the current way gives a valid example of how to use GetLegendGraphics,
why remove it?
>
> We'd still need the "last updated" information in the style files, which
>> could become something standard, or maybe could be done by attaching a
>> style specific listener to the catalog
>>
>
> You could also check resource modification time on the style file, and
> compare against your generated image.
>
Right... that would double the number of file system accesses though
Cheers
Andrea
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