You can perform a trivial use of the query (an xdmp:estimate with a second
argument of 1) and see if it exceptions. If so, you can rebuild from the JSON
and re-register.
This approach does require a bit of query work that otherwise you wouldn't need
to do, but since it's already registered and you're truncating the estimate at
1 it should be minimal.
Also there's the tiniest chance it'll be de-registered between your test and
the actual use. With 64,000 registrations allowed, though, that seems unlikely.
-jh-
On Feb 28, 2012, at 10:03 AM, Ron Hitchens wrote:
>
> Is there a supported way of discovering if a registered
> query ID is still registered?
>
> In the docs, it describes that a cts:search will throw
> an exception if an instance of cts:registered-query refers
> to a no-longer-valid registered query ID, but this is too
> late to be helpful to me.
>
> I also know that I can re-register a query on every use
> and it will hash to the same ID, but that is also not helpful
> in this use case.
>
> I need to build complex access-control queries with
> potentially thousands of terms. These terms are derived
> from parsing JSON descriptions that are then used to fetch
> stored query fragments which are combined and then registered
> together.
>
> The same, arbitrarily complex JSON strings are re-used often.
> What I want to do it use a hash of the JSON as a key to identify
> which registered query to apply. It's the effort of building
> the query from the JSON that I want to avoid.
>
> I can make a run-time map of JSON hash values to registered
> query IDs, that's easy. But I can't see a reliable way to
> determine if a given registration key is still valid.
>
> Because the queries are built up separately from where
> the search ultimately happens, it's not very practical to
> catch an exception at cts:search time and rewind to build
> the query.
>
> Does anyone have a solution for enquiring if a registered
> query ID is still safe to use?
>
> Thanks.
>
> ---
> Ron Hitchens {mailto:[email protected]} Ronsoft Technologies
> +44 7879 358 212 (voice) http://www.ronsoft.com
> +1 707 924 3878 (fax) Bit Twiddling At Its Finest
> "No amount of belief establishes any fact." -Unknown
>
>
>
>
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