[rules-users] Is this possible in Guvnor?

[David Sinclair]

Why are you constructing multiple KBs and sessions? I mean those decision
tables can be written in a way where you would only need a single KB and
session if a4 and a5 in your examples can be set to some "starting" known
state.

If a4 and a5 where initially set to null, or false, or -1 or NOT_SET you
could rewrite the tables as follows

Decision Table 2

------------------------------
>
> ---------------
> condition | condition | condition |     Action    |
> ---------------------------------------------
>    a1      |    a2       |      a4 != NOT_SET    |   a5 =  a4    |
> ----------------------------------------------


Decision Table 3

------------------------------
>
> ------------------------------------------
> condition | condition | condition |   condition | condition |    Action
> |
> -------------------------------------------------------------------------
>    a1      |    a2       |      a3    |      a4       |     a5 != NOT_SET
>    |
> computeValue() |
> ------------------------------------------------------------------------
>

Or use rule flow/agenda groups.

dave


On Fri, Jan 15, 2010 at 11:47 AM, HonorGod <
jagadeesh.motamarri at barclayscapital.com> wrote:

>
> 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
>
>
>
>
>
>
>
>
>
>
> --
> View this message in context:
> http://n3.nabble.com/Is-this-possible-in-Guvnor-tp122132p122132.html
> Sent from the Drools - User mailing list archive at Nabble.com.
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