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Date: 29 Jul 2010 13:47:41 +0200
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Subject: =?UTF-8?q?Re:_Using_Drools_to_Help_with_Rules?=
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cc: BJ Freeman <bjfree@free-man.net>
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=0AW dniu 2010-07-29 05:47, BJ Freeman pisze:=0A>=0A> My efforts have been =
how to have a ui that a business person would =0A> understand, and generate=
 ECA and SECA to accomplish Thier logic. The =0A> top level of this would b=
e when they generate a business plan, it sets =0A> up the rules on how the =
business flow is done. This actually is base =0A> on compiler theory and so=
me program that create web code for a =0A> particular type of web.  I estim=
ated to be about 1.5 man year.=0A>=0A>=0AI thought something similar, but n=
ot connected directly to UI. There should be some kind of stateful document=
 business tier which should react to generic events (like drop line, change=
 field). Events could come from ui tier, but also from batch tier. E.g we w=
ant to create or change order from XML source. Then it should take current =
db state of order (if it exists) diff with target state and generate approp=
riate events. Ideally this event should not require to load into memeory wh=
ole document tree. The best thing would be to have rules/expressions which =
are automatically translabe either into java code or SQL. That for example =
would make possible to decide if we want to summarize order via java code w=
hich makes sens when we have it already loaded into memory or SQL if we cha=
nge only one line.=0A=0AThe best thing I was able to find is called functio=
nal reactive programming and has some implementation for C#, Scala and func=
tional languages. In languages which make possible to get AST of expression=
s we can track dependencies on it or even translate it to SQL update. And D=
SL is also an option. =0A=0AI tried Drools which does not seems to be best =
solution as it does not track dependecies between rules (rule fire order mu=
st be given), so it make possible to calculate order summary before calcula=
te line summary.=0A=0AAnother thing is to make such a document logic extens=
ible and replacable. But if each rule would have its name that would should=
 be easy.=0A=0AI could give more thoughts on it. Maybe some organization wo=
uld be interested in sponsoring such a project =0A=0ABest regards,=0A    Ma=
rek Mosiewicz=0A    http://www.jotel.com.pl=0A=0A