simple search api (was Re: mimetype standardisation by testsets)
jean-francois.dockes at wanadoo.fr
Sun Dec 24 13:48:45 EET 2006
"James \"Doc\" Livingston" writes:
> On Thu, 2006-12-21 at 19:07 +0100, Jean-Francois Dockes wrote:
> > About 2), URI *is* an appropriate handle, and probably the best as long as
> > we can't guarantee the stability of the result set (that is: *if* we need
> > separate Query() and GetSnippets() calls, *then* the URI is probably the
> > best identifier to ensure consistency).
> What if the URI of a given item can change? I'm think in particular of
> the backends which handle "file got moved" in ways other the simple
> "remove old and add new" method.
> If you had to retrieve the URI as a property rather than it being a
> unique identifier there would still obviously be some issues for things
> that are using the simple non-live interface, but potentially having
> stale data is what you get from using a non-live query.
> Using an old URI as the unique identifier to retrieve other data (like
> snippets or something) could lead to some odd situations.
Oops, yes, you're right the URI can change too.
Lacking stable item identifiers, the only solution I can see is to have the
initial query create and return a unique query identifier.
We would then rely on the database/index manager to ensure that all
activity related to this query identifier is either consistent or resulting
The query string can't be used as a query identifier, except if we strictly
renounce relating data from different calls. Well, at least we now know why
it didn't look right :)
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