IPP Mail Archive: Re: IPP> NOT - More about ISSUE 08: Sender

Re: IPP> NOT - More about ISSUE 08: Sender MAY include list of subscription ids and sequence numbers

From: Michael Sweet (mike@easysw.com)
Date: Tue Jul 31 2001 - 11:17:50 EDT

  • Next message: McDonald, Ira: "RE: IPP> NOT - More about ISSUE 08: Sender MAY include list of subscription ids and sequence numbers"

    "McDonald, Ira" wrote:
    > ...
    > <ira> Marty describes the following scenario. A Notification
    > Recipient (NOT the job originator, maybe your secretary)
    > issues Get-Subscriptions with a known "notify-recipient-uri"
    > (e.g., your secretary's 'mailto:' address in 'ippget:' form).
    > Subsequently this Notification Recipient issues periodic
    > (polling) Get-Notifications with the explicit list, but wants
    > to ALSO find any new subscriptions.
    >
    > <ira> I'm not entirely sure I like this optimization. At any
    > point, this Notification Recipient can re-issue Get-Subscriptions
    > and do the search. Adding the optional search (even when the
    > "notify-subscription-ids" operation attribute is supplied) seems
    > like a questionable optimization to me. I think this kind of
    > "third-party" Notification Recipient (not the job originator)
    > should probably do periodic Get-Subscription operations anyway.

    MS> I'd recommend that we just support the notify-subscription-ids
        OR notify-recipient-uri attribute to select subscriptions, and
        REQUIRE the server to reject a request containing both
        attributes with a client-error-bad-request error status.

    MS> If you add the optional search stuff, then having the
        notify-subscription-ids attribute for Marty's scenario
        is of no benefit - the subscription IDs will almost
        certainly be a subset of the subscriptions with the
        specified recipient URI, and you've just forced the
        server to lookup the same subscriptions twice... Better
        to use Get-Subscriptions or always ask for events by
        recipient URI (which should pick up on any new subscriptions
        in wait mode, right? :) 

    -- 
______________________________________________________________________
Michael Sweet, Easy Software Products                  mike@easysw.com
Printing Software for UNIX                       http://www.easysw.com

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