W dniu 2010-07-29 05:47, BJ Freeman pisze:
>
> My efforts have been how to have a ui that a business person would
> understand, and generate ECA and SECA to accomplish Thier logic. The
> top level of this would be when they generate a business plan, it sets
> up the rules on how the business flow is done. This actually is base
> on compiler theory and some program that create web code for a
> particular type of web. I estimated to be about 1.5 man year.
>
>
I thought something similar, but not 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 want 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 appropriate events. Ideally this event should not require to load into
memeory whole 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 which makes sens when we have it already loaded into memory or SQL if we
change only one line.
The best thing I was able to find is called functional reactive programming and
has some implementation for C#, Scala and functional languages. In languages
which make possible to get AST of expressions we can track dependencies on it
or even translate it to SQL update. And DSL is also an option.
I tried Drools which does not seems to be best solution as it does not track
dependecies between rules (rule fire order must be given), so it make possible
to calculate order summary before calculate line summary.
Another thing is to make such a document logic extensible and replacable. But
if each rule would have its name that would should be easy.
I could give more thoughts on it. Maybe some organization would be interested
in sponsoring such a project
Best regards,
Marek Mosiewicz
http://www.jotel.com.pl
