I was not able to portray the
right picture L. Here’s another shot at
clarifying
my situation.
Let’s say we have a commission
rule as follows
rule "Commission Calculation 07-08"
date-effective "01-Apr-2007"
date-expires "30-Mar-2008"
when
....
then
....
end
Now for the next financial year
we define a new rule as
follows
rule "Commission Calculation 08-09"
date-effective "01-Apr-2008"
date-expires "30-Mar-2009"
when
....
then
....
end
Now let’s say today’s
date is 15th April 2008. An agent is promoted
today
with effective date as 1st
March
2008. Hence his commission needs to be recalculated as
per the “Commission
Calculation 07-08” rule
and not the
effective rule as on today i.e.
“Commission Calculation 08-09”.
For rest of the agents commission would be calculated based on the rule
effective today i.e. 15th April 2008. Hence a need to pass a
date
during execution of rule based on which the right rule would be chosen.
Basically there is no legacy
code as part of my example but
a need to fire the rules that are effective on a date other than the
system
date always.
I have seen similar
functionality in other rules engines
too. Can this be done in JBoss Rules? If yes, is TimeMachine the right
way of
doing it?
Regards,
- Nimesh
As I understand it, the problem is that you
have
legacy code that uses the system date in it's calculations and you
cannot fix
that so it will take a date parameter, right? If so, then my
recommendation is
to fix the legacy software if possible since messing with the system
date gives
me the willies. If you can't fix it, then anything that can be called
from Java
to set the system date (e.g.Runtime.exec(...).waitfor()?) should be
callable
from the 'then' part of a rule. Make that call, call your legacy code,
then
make the call to set the date back. But that is so ugly, please don't
tell
anyone I had anything to do with it.
Nimesh Muley's message
received
3/5/2008 1:25 AM:
Hi,
Is there a way to set the date while
executing the
rules? The effective dates would be checked against this date instead
of
today’s date. By default the effective dates would be checked with
System
date. But in some cases we would need to execute the rules in a
‘back-dated’ mode.
Use case.
Let’s say in insurance industry there are
commission calculation rules for an agent. On these rules the effective
dates
are appropriate (as per their needs). Now when an agent is promoted and
his/her
promotion date is couple of months back then we would want to calculate
the
commission once again with the date as 2 months back.
The nearest I could see is TimeMachine, as
this is
being used during execution of rules. Although I could not find a way
to set
the TimeMachine in release 4.0.4.
Has anyone tried something like this before?
Regards,
- Nimesh
"The first 90% of a project takes 90% of the
time, the last 10% takes the other 90% of the time" - Murphy's Law
While
so very true, this is not Murphy's Law, which I think of as "Whatever
can
go wrong, probably will." (see http://en.wikipedia.org/wiki/Murphy%27s_law)
Your rule here is called the 90-90 rule: http://en.wikipedia.org/wiki/Ninety-ninety_rule