Instead of creating 3 Knowledge bases you can have one KnowledgeBase with all three decision tables and then each decision table will have a "Salience" to control the priority of execution. DT1 has highest Salience and DT3 has lowest value.

When you upload these DT into Drools BRMS you will have one binary package for all these three DTs even though you define different packages for each one of those DTs. Is that the case ? 



From: HonorGod <jagadeesh.motamarri@barclayscapital.com>
To: rules-users@lists.jboss.org
Sent: Fri, January 15, 2010 11:47:21 AM
Subject: [rules-users] Is this possible in Guvnor?


Hi,

I have a single fact model with 5 [a1, a2,a3, a4, and a5] different
attributes. I have 3 decision tables in the following fashion

Decision Table 1

---------------------------------------------
condition | condition | condition |    Action    |
---------------------------------------------
    a1      |    a2      |      a3    |  a4 = a1+a3|
----------------------------------------------


Once I have the value of a4, I need to hit different set of rules which are
stored in second decision table

Decision Table 2

---------------------------------------------
condition | condition | condition |    Action    |
---------------------------------------------
    a1      |    a2      |      a4    |  a5 =  a4    |
----------------------------------------------


Once I have the value of a5, I need to hit different set of rules which are
store in third decision table

Decision Table 3

------------------------------------------------------------------------ 
condition | condition | condition |  condition | condition |    Action       
|
-------------------------------------------------------------------------
    a1      |    a2      |      a3    |      a4      |    a5      | 
computeValue() |
------------------------------------------------------------------------


I don't have any problem when I load the rules into individual KnowledgeBase
and fire the rules one after the other as follows -

<code>
        // apply rules from decision table 1
        StatefulKnowledgeSession kSession =
knowledgeBase1.newStatefulKnowledgeSession() ;
        kSession.insert(caEventDO);
        kSession.fireAllRules();
       
        // apply rules from decision table 2
        kSession = knowledgeBase2.newStatefulKnowledgeSession() ;
        kSession.insert(caEventDO);
        kSession.fireAllRules();

        // apply rules from decision table 3
        kSession = knowledgeBase3.newStatefulKnowledgeSession() ;
        kSession.insert(caEventDO);
        kSession.fireAllRules();

        kSession.dispose() ;

</code>

But when I upload the decision tables into Guvnor and use the package / drl
from the package snapshot my second set of rules are not fired at all.

How do I resolve this issue?

Please help.

Thanks










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