On Jul 8, 1:43 pm, John Mettraux <[email protected]> wrote:
> On Thu, Jul 08, 2010 at 12:54:05PM -0700, Don French wrote:
>
> > Using this example:
>
> > 1 sequence do
> > 2 participant '${f:patient}'
> > 3 participant '${f:doctor}'
> > 4 end
>
> > Using patients: 'patient 1', 'patient 2', and physicians - 'physician
> > 1', and 'physician 2'
>
> > I am assuming that I would need to register participants under each of
> > those names. That seems like a lot of registered participants given a
> > real world environment. Can you register the participant in the
> > sequence and then unregister it before the end? What is the
> > difference in using generic named participants like 'patient' and
> > 'physician' as opposed to dynamic like above. Is one a better approach
> > and why?
>
> Hello Don,
>
> you could go and register participant categories :
>
> engine.register_participant 'patient .+', PatientParticipant
> engine.register_participant 'physician .+', PhysicianParticipant
>
would not this fill the registered participant table with lots of
participants that were used once and possibly never again? Or does
that just register one participant because of the register statement
and then you get the name inside the actual participant?
> and then do the 'dynamic' thing inside of the participant.
>
> ( Ruote::StorageParticipant parenthesis ...
>
> For human participants, I tend to use a Ruote::StorageParticipant (basically
> a kind of workitem [in]box)
>
> engine.register_participant 'patient .+', Ruote::StorageParticipant
> engine.register_participant 'physician .+', Ruote::StorageParticipant
>
> I then query it like this
>
> sp = Ruote::StorageParticipant.new(engine)
> patient_wi = sp.by_participant('patient 1')
Where would you use that query? In a generic participant?
>
> In some cases, a "catch all" is registered last
>
> engine.register_participant '.+', Ruote::StorageParticipant
>
> All the workitems for unnamed participants (and subprocesses) go into it.
> This is very handy, but can have undesired effects
>
> sequence do
> don
> jhon
> end
>
> There will be workitems for "don" and "jhon", too bad since I'm expecting
> them for "john" (anything that is not a ruote expression or a subprocess is
> caught by the "catch all" participant).
>
> ... end of Ruote::StorageParticipant parenthesis )
>
> You could also do
>
> engine.register_participant 'patient .+', QueueParticipant, :channel =>
> 'patient'
> engine.register_participant 'patient .+', QueueParticipant, :channel =>
> 'physician'
>
> and true your QueueParticipant implementation to route the workitems to the
> right "real" participant behind the scenes.
>
> It would be OK to register / unregister participant, but I think this could
> make the system less robust. Better to put the dynamicity elsewhere.
>
> I hope it helps, cheers,
>
> --
> John Mettraux -http://jmettraux.wordpress.com
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