Subject:
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Re: Automatic download of unofficial parts in LDView
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Newsgroups:
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lugnet.cad.dev.org.ldraw
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Date:
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Wed, 17 May 2006 14:06:18 GMT
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Viewed:
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1827 times
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On Sun, May 14, 2006 at 07:13:01AM +0000, Travis Cobbs wrote:
> I'm working on a feature in LDView where it will automatically check
> the parts tracker for unofficial parts when it encounters a file that
> it can't find. This has the potential to produce a fairly large
> amount of requests to the parts tracker, so I have some questions.
>
> First of all, is this acceptable for LDView to do? It can definitely
> make the user experience [much] more enjoyable when opening other
> people's files that use unofficial parts. But on the other hand, it
> will generate an as-yet unknown amount of additional traffic to the
> parts tracker.
Shouldn't be a problem at all. If it's anything significant, I'll just
start mirroring the DAT files to media.peeron.com, and have you use
that. Then it certainly wouldn't be an issue.
> I will definitely configure it to not check for any particular file
> more often than some certain threshold. The threshold will be at
> least one day, but could probably realistically be set to a week.
> This threshold will be client-side, though. That means that every
> user will have their own unique list of files that have been checked
> "recently". Note that even if it has downloaded an unofficial file,
> it will still need to check the tracker to see if the file has been
> updated since it was downloaded. This will use the same "recently"
> threshold.
Sounds reasonable. Perhaps it might be more efficient (for the client)
to send just one request with a list of files it needs, and have the
server return all the ones that are found? That should make the whole
operation faster, since it'll be just one HTTP request/reply, instead of
(potentially) hundreds.
> Furthermore, there's really no way to tell purely based on the
> filename if the file is a part. So any models that reference missing
> sub-assemblies will cause LDView to check the parts tracker for these
> sub-assemblies. On top of that, there's no way to tell if the file is
> a primitive (unless it's in the 48/ directory). So every primitive
> will first have to be queried as a part. When that fails, it will be
> queried as a primitive. Additionally, every file that doesn't have an
> s/ prefix will be queried as a primitive if no part exists. This
> particular problem could be fixed server-side, though, if there was
> some new base URL added that automatically checked for the file as a
> part, and then automatically checked as a primitive if the part didn't
> exist. (If LDView successfully downloads a file once, it will
> remember what it is, thus preventing the double check when checking to
> see if the file has been updated on the tracker.)
Shouldn't be a problem.
> So, to the admins of ldraw.org, what do you think?
I can't speak for LDraw proper, but from the server side, not a problem.
--
Dan Boger
dan@peeron.com
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 | | Automatic download of unofficial parts in LDView
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| I'm working on a feature in LDView where it will automatically check the parts tracker for unofficial parts when it encounters a file that it can't find. This has the potential to produce a fairly large amount of requests to the parts tracker, so I (...) (18 years ago, 14-May-06, to lugnet.cad.dev.org.ldraw, FTX)
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