I’m not sure you can nest rules, you are thinking too procedural, but you can extend conditions/lhs from other rules. Here is an example from the test case in the drools source “extend_rule_test.drl” that may help you.

rule "test rule 1"

enabled false

when

        c: Cheese( type == "stilton" )

then

            list.add( new String ("rule 1") );       

end

rule "test rule 2" extends "test rule 1"

enabled false

when

        Cheese( price <= 6.00) from c

then

            list.add( new String ("rule 2") );      

end

rule "test rule 3" extends "test rule 2"

when

        Cheese( price > 1.00 ) from c

then

            list.add( new String ("rule 3") );        

end

Rule 1 & 2 are disabled, but rule 3 in the rete network will have all 3 LHS (conditions). So the above would render…

rule "test rule 3"

when

c: Cheese( type == "stilton" )

Cheese( price <= 6.00) from c

Cheese( price > 1.00 ) from c

then

            list.add( new String ("rule 3") );        

end

This was modeled more after how a programming language would have one class extend another, but it only inherits the LHS.

-Michael

P.S. I believe this is available only in trunk at this time, but will be out with the next 5.x release.

From: rules-dev-bounces@lists.jboss.org [mailto:rules-dev-bounces@lists.jboss.org] On Behalf Of David Sinclair
Sent: Wednesday, November 12, 2008 8:50 AM
To: m_dilipkumar2006@yahoo.co.in; Rules Dev List
Subject: Re: [rules-dev] Regarding Nested Rules in Drools 4.0.7

I think u are thinking about this in the wrong sense. You don't want to call another rule. You can assert a fact that will cause that other rule to fire.

On Wed, Nov 12, 2008 at 9:45 AM, M.DILIP KUMAR <m_dilipkumar2006@yahoo.co.in> wrote:

Hi All,

    I got many idea by using this group. Now i want one clarification regarding Nested rule.

If any one having sample code for nested Rule means Pls send reply along this mail.

Acutally i want rule like

Rule : "nested Rule"

 When

       #Condition is true

 Then
     CALL another RULE ...!!!!

      Here i want pass some argument to that nested rule

  is it possible ?

End

Help me regarding this and send sample code if possible please

Defeat yourself today!

____________________________

Error! Filename not specified.DILIP  KUMAR.M

---

Add more friends to your messenger and enjoy! Invite them now.
_______________________________________________
rules-dev mailing list
rules-dev@lists.jboss.org
https://lists.jboss.org/mailman/listinfo/rules-dev