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Re: Choreography lifeline Proposal (was RE: Proposal: To remove the initiate flag on the Interation)

From: Haugen Robert <Robert.Haugen@choreology.com>
Date: Tue, 16 Nov 2004 13:44:38 -0000
Message-ID: <221369570DEDF346AE42821041345E8951BC7C@imap.choreology.com>
To: <public-ws-chor@w3.org>
Nick,

Unless I can't read, your latest lifeline proposal does not respond to
the finalization issue, as expressed by Peter in the "original message"
beneath your proposal:

> ...the Life-line section needs to say something about 
> a choreography's "life after death" - or rather
> finalization after completion...

Note that this issue exists whether or not our multiple-finalizer
proposal succeeds.

What it means is that, if any finalizers have been defined for a
choreography, the state that is now called "complete" is more accurately
called something like "ready for finalization" - that is, the
finalizer(s) is(are) enabled, the states of variables must be preserved,
and external observers cannot know the final outcome of the choreography
until a finalizer is fired, which may take a relatively long time.

I added some language to the lifeline section about finalization to
Coordination Proposal 3:
http://lists.w3.org/Archives/Public/public-ws-chor/2004Oct/0066.html


"After a Choreography completes successfully, any Finalizer blocks
specified in the Choreography are enabled.  In other words, as long as
Finalizer blocks are enabled, the Choreography is still alive until one
of the enabled Finalizers is fired and completes its own Work Unit, at
which time the Choreography is closed."

If I understood correctly, you didn't like "still alive", and I would
prefer "ready for finalization" to "completed successfully", but the
idea is there.


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