[rules-users] Need Suggestion about what rule engine to use

[Vincent LEGENDRE]

Your 2nd use case, and especially the part "10k rules, growing, dynamic, changing" is a good reason to use engine like drools. 
And to me, using the same system for both use cases is better than mixing technologies, even if the use case 1 is not an obvious candidate (15 simple rules that never change...). 

Then you should read the doc (and post questions here) to have a clear ideas on : 
- if the drools langage has everything you need, and stays clear to you (and for the rules' authors) 
- the engine is not too overkill for what you are planning to do (have a look to the difference between default forward chainin g behaviour, and sequential mode) 
- the engine integration does not require to refactor all your code (or at least what you will have to do to integrate drools sessions is ok with your dev plan) 
- there will certainly have some performances drawbacks comparing to a dedicated (and I suppose sequential) home-made rule engine. Such thing can be checked by porting your first 15 rules use case and measure perfs delta. 

----- Mail original -----

De: "debchamps" <majumdar.debarghya at gmail.com> 
À: rules-users at lists.jboss.org 
Envoyé: Lundi 25 Juin 2012 18:48:38 
Objet: [rules-users] Need Suggestion about what rule engine to use 

Hi, 

I have an application where I will be requiring rule engine in two places. 

Use case1 
------------- 
I have around 15 rules(It is likely to change very rarely) which are like 
truth table 

var1 var2 var3 var4 Action 
true false false true add x,y,z to list 
false false false true set x = todaysDate +3 

Use case2 
------------ 
There is lots of rules (atleast 10000 and growing) 
and the rules is like 

var1 = 'x' and var2 = 'y' set x=1 
var2 = 'e' and var5 = 'f' add 'Ram' to list B 

The rules can be added dynamically and at anytime(absolute necessity) 

Currently we are using a rules engine which is coded by ourself where we 
load rules and actions from memory every 15 minutes and execute the rules 
engine. However if the rules grow like anything we may face problem in the 
future 

The use case1 can be implemented by the existing rules engine. But inserting 
the rules in the database is a problem area in the current implementation 
other than some standard cases like Use case2 

I need suggestion on how to approach the problem and what rule engine to use 
: - 

1> Move everything to a new Rule Engine 
2> Have use case 2 in the old rule engine and use case 1 in new Rule Engine 
(Is it good ... ) 
3> Have everything in the old RuleEngine 

So in case of a new Rule Engine what is recommended ?? 

Thanks and Regards, 
NewBie in RuleEngine 
















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