[rules-users] How to get correct version of rules based on effective date

[Swindells, Thomas]

Do your rules actually change over time or just the paramaters in your rules change?
If the later then you could structure your rules so they don't have values hard coded but instead depend upon an Object (InterestRate) to provide them and you code just loads the appropriate InterestRate object when the query starts.

Thomas

From: rules-users-bounces at lists.jboss.org [mailto:rules-users-bounces at lists.jboss.org] On Behalf Of Wolfgang Laun
Sent: 21 February 2011 09:08
To: Rules Users List
Subject: Re: [rules-users] How to get correct version of rules based on effective date

There may be one rule to determine the interest rates depending on date and whatever, and then there should be rules to do the calculation for some type of deposit (savings, loand,...) with the previously established rate.

Do not replicate calculation rules for various date intervals.

-W

On 21 February 2011 05:36, Faisal Shafique <just_faisal at yahoo.com<mailto:just_faisal at yahoo.com>> wrote:
Hi,

We are evaluating Drools to replace a big legacy eligibility system in government sector. One of the critical requirement is to have the system pull correct rule based on a date e.g interest rate was 5% till 12/31/2010 but changed to 6% from 1/1/2011. If we are running rules in 2010 or before, calculation should use 5% else it should use 6%. Rules will run with a user clicking a button and results will be shown to user so probably a StatelessSession will be used. Something like AgendaFilters to filter rules based on a date probably will not be very scalable since over time we'll have lot of different temporal version of rules and all of them will have to be in KnowledgeBase for AgendaFilter to work which will be memory intensive and un-needed.IMHO, we should build KnowledgeBase with correct version of rules in the first place. Any ideas or pointers?

Thanks



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