RE: [wsn] Preconditions

["David A. Chappell" <chappell@sonicsoftware.com>]

I think it should be left open to interpretation.  I view precondition as a "publish when <a certain condition occurs>".  A use case could be an order processing system with a precondition that specifies "publish my order fullfillment messages 3 days before Mother's day".  As an implementation detail, this condition could be either be evaluated when the order was initially placed, and put in a proprietary time-based triggering mechanism, or put in a bucket with all other time-based precondition expressions and evaluated each day.  I think the spec should allow the flexibility.

Dave

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From: Susan Malaika [mailto:malaika@us.ibm.com]
Sent: Friday, November 05, 2004 8:18 AM
To: Patil, Sanjay
Cc: wsn@lists.oasis-open.org
Subject: RE: [wsn] Preconditions

Should the time of evaluation of preconditions go into the specification or be left open to interpretation?

Susan Malaika

To: Susan Malaika/Santa Teresa/IBM@IBMUS, wsn@lists.oasis-open.org
cc:
Subject: RE: [wsn] Preconditions




It's the latter, as I understand.
 
I guess the notification may not even be produced as a result of evaluating a precondition. For example, if  precondition is debug=true, and the Producer is not in a debug mode.
 
Thanks,
Sanjay
-----Original Message-----
From: Susan Malaika [mailto:malaika@us.ibm.com]
Sent: Thursday, Nov 04, 2004 4:36 AM
To: wsn@lists.oasis-open.org
Subject: [wsn] Preconditions




When are preconditions evaluated? When a subscription is made? When a notification is about to be produced?

Susan Malaika