[rules-users] Setting date during execution of rules.
Scott Reed
sreed at avacoda.com
Thu Mar 6 09:30:08 EST 2008
I am probably still misunderstanding, but it seems that the effective
and expires dates are constants that can be used in the left hand side
of the rules:
rule "Commission Calculation 07-08"
when
$agent: Agent( promotedDate >= "01-Apr-2007",
promotedDate <= "30-Mar-2008")
$sale: Sale( agent = $agent, $amount: amount )
....
then
$agent.addCommission( $sale, $amount, .09); // .09 is
the commission rate for this rule
....
end
Now for the next financial year we define a new rule as follows
rule "Commission Calculation 08-09"
when
$agent: Agent( promotedDate >= "01-Apr-2008",
promotedDate <= "30-Mar-2009")
$sale: Sale( agent = $agent, $amount: amount )
....
then
$agent.addCommission( $sale, $amount, .06); // .06 is
the commission rate for this rule
end
Nimesh Muley's message received 3/6/2008 1:00 AM:
>
> 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 15^th April 2008_/. An agent is
> promoted today with /_effective date as 1^st 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. 15^th 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:* rules-users-bounces at lists.jboss.org
> [mailto:rules-users-bounces at lists.jboss.org] *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.
> Making a valuable difference
> Mastek in NASSCOM's 'India Top 20' Software Service Exporters List.
> In the US, we're called MAJESCOMASTEK
>
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