MFD> Scan Service Sectionr 10

MFD> Scan Service Sectionr 10

MFD> Scan Service Sectionr 10

William A Wagner wamwagner at comcast.net
Mon Feb 2 00:39:47 EST 2009


Ira,

1. Yes, you had made the point before that StartupScanService was sent to a
(undefined?) system, not to the service that is being started. However, the
detailed state diagram (Fig 27) indicates that "Startup" takes the service
from Down to Idle. There is no indication of what takes service from Unknown
to Down. From a practical state, I questioned the Unknown to Down state
transition prior to going  to Idle. To address StartupScanService, perhaps
line 5 should read: "On creation by a StartupScanService request, the Scan
Service enters its Initial phase..."?  Would acceptable wording on Line 7
be: "After successful initialization, the Scan enters the  Online state..."

Pete's 22 Jan version includes RestartScanService so I expect that that
should be mentioned.

2. I understand your distinction, but the detailed state diagram shows that
pause() and C.Critial effect the transition to Stopped. How about if we keep
it simple here in the text and just say    "...either a Critical event is
generated" and avoid getting into the specific notation of the detailed
state discussion? 

Thanks,  

Bill Wagner

-----Original Message-----
From: owner-mfd at pwg.org [mailto:owner-mfd at pwg.org] On Behalf Of Ira McDonald
Sent: Sunday, February 01, 2009 10:28 PM
To: William A Wagner; Ira McDonald
Cc: mfd at pwg.org
Subject: Re: MFD> Scan Service Sectionr 10

Hi Bill and Pete.

Bill - I like all of your new text.

However, there are two serious problems in existing text:

(1) Second paragraph at line line 5 of page 2 is just wrong

It is a StartupScanService operation (spelled that way) sent
to a System (NOT a ScanService) that creates a new instance
of a ScanService in the Initial phase, causes self-test, and finally
transition to Online phase / Idle state.  The ScanService itself
does NOT perform a start-up operation (line 7).  It is handling
the single E.startup *event* sent to it by the System (while in
in the Initial phase / Unknown state).

If we keep it, a RestartScanService operation could be sent
to a ScanService (to recover from a Shutdown to Offline
phase / Down state).  See the notes on lines 1628 to 1639
on pages 66 and 67 of lcrc-mfdscanmodel10-20090119.pdf


(2) Recurring problem of reading the terms in state tables

The notation key in the Scan Service spec for the state table
is at line 1618 page 66 in lcrc-mfdscanmodel10-20090119.pdf

For example at line 12 in page 2 of your draft, we see:

   "...either a C.Critical event is generated"

The expression "C.Critical" means a *passive* Condition (C)
(i.e., a ScanService.StateReasons value) is TRUE that a Critical
alert is now pending.  While, the expression "~C.Critical" means
that any NOT (~) Critical Condition is now pending.

The expression "E.Critical" means that an *active* Event (E)
that is Critical has just occurred.  Conversely "~E.Critical" means
that any non-Critical (i.e., warning) event has just occurred.

So "C.Critical event" is confused.

Cheers,
- Ira

Ira McDonald (Musician / Software Architect)
Chair - Linux Foundation Open Printing WG
Blue Roof Music/High North Inc
email: blueroofmusic at gmail.com
winter:
  579 Park Place  Saline, MI  48176
  734-944-0094
summer:
  PO Box 221  Grand Marais, MI 49839
  906-494-2434



On Fri, Jan 30, 2009 at 4:26 PM, William A Wagner <wamwagner at comcast.net>
wrote:
> Considering the decisions at yesterday's conference call with respect to
> "submitting a job", I modified the proposed rework of Section 10 of the
Scan
> Service document. This rework (only in markup) is posted as
> ftp://ftp.pwg.org/pub/pwg/mfd/white/ScanServiceTheoryOfOp-revB.pdf.
>
>
>
> Thanks,
>
>
>
> Bill Wagner
>
>
>
> From: owner-mfd at pwg.org [mailto:owner-mfd at pwg.org] On Behalf Of Zehler,
> Peter
> Sent: Thursday, January 29, 2009 1:38 PM
> To: mfd at pwg.org
> Subject: MFD> Update to Agenda for MFD Teleconference, Thursday 1/29 3:00
> EDT
>
>
>
>
>
> There will be an MFD conference call at 3:00 PM EDT (12:00 PM PDT) this
> Thursday.  The meeting is held in accord with the PWG Intellectual
Property
> Policy.
>
>
>
> Note the NEW Teleconference number and access code are now used.
>
> Please contact me if you do not have the new number and pass code.
>
>
>
> Agenda:
>
> 1. Identify Minute Taker
>
> 2. Approval of minutes from last teleconference
>
>
<ftp://ftp.pwg.org/pub/pwg/mfd/minutes/pwg-mfd-minutes-20090115.pdf>
>
> 3. Agenda bashing
>
> 4. Discuss syntax of JobPhoneNumber on line 2182 of Scan specification
>
> 5. Discuss open ended REQUIREMENT governed by a third party (End User)
> policy on line 2788-2790 of Scan specification
>
> 6. Discuss Bill's comments on in Resource Service
>
>
>
<ftp://ftp.pwg.org/pub/pwg/mfd/white/nancy-Proposed-Resolution-for-Bill-W-co
mments-for-Resource-Service-20090127.pdf>
>
>       b) Discussion of Testing State, transition in and out, and method of
> transition   Part of both Resource and Scan Service discussion)
>
> 7. Discussion on Scan Service State and proposed change to section 10 of
the
> specification
>
>       a) Chose between the existing text, proposed text or arrive at some
> other consensus.
>
>          Existing text is section 10
> <ftp://ftp.pwg.org/pub/pwg/mfd/wd/lcrc-mfdscanmodel10-20090122.pdf>
>
>          Proposed change is available at
> <ftp://ftp.pwg.org/pub/pwg/mfd/white/ScanServiceTheoryOfOp.pdf>
>
> 8. Discuss any comments on the Resource Service interim draft.  Objective
is
> to move to the Last Call version for review at the Face to Face.
>
>
<ftp://ftp.pwg.org/pub/pwg/mfd/wd/wd-mfdresourcemodel10-20090115.pdf>
>
> 9. Next steps
>
>
>
> Click Here to Join Live Meeting
>
<https://www.livemeeting.com/cc/xerox/join?id=PWG_MFD&role=attend&pw=PQ%25%3
EFj5sN>
>
>
>
>
>
>
>
>
>
>
>
>
> Peter Zehler
>
> Xerox Research Center Webster
> Email: Peter.Zehler at Xerox.com
> Voice: (585) 265-8755
> FAX: (585) 265-7441
> US Mail: Peter Zehler
> Xerox Corp.
> 800 Phillips Rd.
> M/S 128-25E
> Webster NY, 14580-9701
>
>




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