I was not able to portray the right picture :(. 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
________________________________
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Scott Reed
Sent: Wednesday, March 05, 2008 8:40 PM
To: Rules Users List
Subject: Re: [rules-users] Setting date during execution of rules.
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
MASTEK LTD.
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