IPP Mail Archive: RE: IPP> Notification Subscriptions across

RE: IPP> Notification Subscriptions across Power Cycles

From: McDonald, Ira (IMcDonald@crt.xerox.com)
Date: Wed Aug 29 2001 - 12:12:53 EDT

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    Hi Harry,

    Concensus on more recent IPP Fax telecons this summer has been that
    Subscription objects themselves MUST have the same lifetime as
    their associated Jobs. And further that BOTH the Subscription and
    the Job (with _all_ of its attributes) MUST persist until the
    lifetime of the 'job-completed' event (last event) has expired.

    So, I suggest that:

    If an IPP Printer supports "persistent" Jobs (across power cycles),
    then that IPP Printer MUST support "persistent" associated per-job
    Subscriptions.

    Now, if event lifetimes are long enough, do the actual _events_
    "persist" into the next power cycle, if necessary (according to
    the event delivery method constraints in 'notify-recipient-uri')?

    Cheers,
    - Ira McDonald
      High North Inc

    -----Original Message-----
    From: Harry Lewis [mailto:harryl@us.ibm.com]
    Sent: Tuesday, August 28, 2001 6:51 PM
    To: ipp@pwg.org
    Subject: IPP> Notification Subscriptions across Power Cycles

    Does IPP have a "position" on either per-job (i.e. if job is spooled) or
    per-printer subscriptions and whether or not they should be preserved
    across power cycles?

    Looking at the Notification Spec (draft-ietf-ipp-not-spec-07) the only
    related discussion appears to be in Section 5.4.3 (When the Printer powers
    up, it MUST set the value of this
    (notify-lease-expiration-time) attribute in each persistent Subscription
    Object...) which implies per-printer subscriptions may be expected to
    persist
    across power cycle.
    ----------------------------------------------
    Harry Lewis
    IBM Printing Systems
    ----------------------------------------------



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