John, (01)
>Petri nets are a good message-passing model, which subsumes finite
>state machines, flow charts, and many kinds of concurrent processing
>as special cases. (02)
I found (http://workflow.healthbase.info/) following argument regarding Petri
nets quite relevant to this discussion:
"...States are not necessarily related to activities or
events. This means that traditional object life-cycle models are inadequate.
Traditional (Petri-net based) models of object life-cycles model closed systems
and so assume that a state results from a transition." (03)
I might add that REST-based interaction by definition limits the scope of state
to single interaction. I can't help but to recall 2000 movie called "Momento"
in which main personage is afflicted by brain disorder preventing any new
memory from being formed. (04)
I believe that in principle stateless protocols are not sufficient to support
SOA. The alternative approaches are generally known as "distributed shred
memory" had been researched for a long time, but were not economically feasible
until now. (05)
_________________________________________________________________
Message Archives: http://ontolog.cim3.net/forum/ontolog-forum/
Subscribe/Config: http://ontolog.cim3.net/mailman/listinfo/ontolog-forum/
Unsubscribe: mailto:ontolog-forum-leave@xxxxxxxxxxxxxxxx
Shared Files: http://ontolog.cim3.net/file/
Community Wiki: http://ontolog.cim3.net/wiki/
To Post: mailto:ontolog-forum@xxxxxxxxxxxxxxxx (06)
|