2008/10/2 Tony Arkles <[EMAIL PROTECTED]>:
>
> I don't think that'll help. :(
>
> I'm trying to ensure uniqueness... so if two people try to add the
> same URL, there will only be one entry in the datastore. I don't
> think there's any guarantee that tinyurl/etc would provide that
> uniqueness constraint.
>
> Also, there will be a pretty decent volume of lookups going on, and
> routing every request through tinyurl won't win me any friends :)
Then I think your only solution is to do it yourself (the
"tinyurl" service), assuring uniqueness. Basically, you "only" need to
mix datastore simple Gets with hashtable behaviour (taking care and
assuming that two different urls, despite rare, can result in the same
hash key). You need to query by hash key and then, among the results,
look for the matching url. Most of the time (depending on the url->key
algorithm) you should get few results, so overhead won't be a problem.
Best,
Jose
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