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ZNG  December 2002

ZNG December 2002

Subject:

Re: resultSets

From:

Matthew Dovey <[log in to unmask]>

Reply-To:

Z39.50 Next-Generation Initiative

Date:

Sun, 15 Dec 2002 21:05:37 -0000

Content-Type:

text/plain

Parts/Attachments:

Parts/Attachments

text/plain (35 lines)

 
> The use of resultsets and a TTL strongly depend on the nature
> of as well client as server. If there is a need for some 
> applications to have the client set the TTL why not let them 
> do that? It is up to the server to support it and to take 
> care of its own strategy with respect to dealing with the 
> TTL's. We have the mechanism that returns unknown parameters 
> in the tag <unkown> so we can be quite flexibel in allowing 
> optional parameters. The only thing we have to do is that we 
> agree on those parameter names, so that applications that do 
> support it will at least use the same parameter name.

I'm not arguing against TTL negotiation per se just that it should be a
new (optional) operation rather than overloading and substantailly
chaging the current searchRetrieve operation and model.

For interactive clients, poking the server to keep a result set alive is
in many cases sufficient and given there is no absolute guarantee a
result set will not be deleted before its TTL or in our suggested TTL
negotiation that a server will grant that the client requested TTL, a
client would need to be willing to drop down to the "poking the server"
approach anyway.

The only use case so far suggested where a TTL negotiation is essential
is where the client expects to be able to resume a result set after a
relatively long period of absence (possibly when the client wasn't
running). That I think is a whole new model of operation and better
served by a TTL negotiation operation (or operations) rather than new
parameters to searchRetrieve.

(We had similar arguments over whether searchRetrieve should be
overloaded to return explain data).

Matthew

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