Hi!
Have you tried to create stateful agents?
This would be useful for implementing long running business processes.
The state would be saved to db for durbality and atomicity.
In case of crash, the process implemented as agent would continue to execute
from the last durable state.
I have implemented (lol funny to say implemented but in case of LISP the job
is partialy done :-)) already this:
(ns bpml.core)
(defmacro statful[ & a ]
# this macro analyses its arguments lineary and when matches the state of
entity with name of catched defactivity then continues executing body from
that place
)
(defactivity receive-credit![ a ]
# user processing rules
)
(defn scenario-one[ a ]
(stateful
(let[ z (receive-credit! a)
g (approval! z)]
(when-not (approved? g)
(include-transaction-history! g))
(include-standard-text! g)
(send-jms (do
)))))
(dispatch-jms "jms://queueu:12232/me"
(fn[ msg ] true ) scenario-one)
This is some kind of that process
www.omg.org/news/meetings/workshops/HC-Australia/Mancarella.pdf from page
number 8.
The main idea is not to mimic BPML since LISP != Graph (I would make
interpretation of XML, but not now in prototyping stage).
The first idea to achive that is to store state of input/output arguments
of each call to any activity (defined with defactivity) and next time when
there is the recovery from crash, stateful macro do the job as it is written
above in its body as comment.
Maybe you have other ideas for to implement such functionality?
Why I'm trying to do stateful processing in Clojure? Because LISP is a
mother of ALL languages. It allows to implement any kind of processing flow
especially the abstract one/declerative/higher order. But somehow this
concept seems to be hard, since I can't express it in declerative way but by
imperative tracing. Another idea is to use monads but I'm to weak to
understand them in way allowing to implement it.
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