[rules-users] Possible problem in PathMemory

[raojinghai at gmail.com]

Hi Michael,

Here I use global static variables to store the dynamic salience values. I
tried with facts and the results are all the same.

Thanks.

Jinghai


On Fri, Jun 13, 2014 at 4:22 PM, Michael Anstis <michael.anstis at gmail.com>
wrote:

> I could be wrong but I thought dynamic salience used facts in working
> memory and hence your RHS would need to signal changes to the salience
> variables.
>
> Sent on the move
> On 14 Jun 2014 00:01, <raojinghai at gmail.com> wrote:
>
>> Hi Mario,
>>
>> I figured out this is a problem with Event and dynamic salience. Suppose
>> we have the following declarations and rules:
>>
>> declare Message
>>     @role(event)
>> end
>>
>> rule "rule1"
>> salience RuleSalience.RULE1
>> when
>>     $m : Message()
>> then
>>     System.out.println("====================> rule1");
>>     retract($m);
>>     RuleSalience.RULE1 = RuleSalience.RULE2 - 1;
>> end
>>
>> rule "rule2"
>> salience RuleSalience.RULE2
>> when
>>     $m : Message()
>> then
>>     System.out.println("=====================> rule2");
>>     retract($m);
>>     RuleSalience.RULE2 = RuleSalience.RULE1 - 1;
>> end
>>
>> I want when a Message is inserted, either rule1 or rule2 is fired. I also
>> want two rules can fire alternatively. So when one rule is fired, its
>> salience becomes lower.
>>
>> The result is, if I don't declare Message as an Event, it works fine.
>> Otherwise, only rule1 is fired.
>>
>> The problem seems to be at
>> org.drools.core.reteoo.LeftInputAdapterNode::doInsertSegmentMemory().
>> Because of stream mode, both rules are not inserted StagedLeftTuples. So
>> rule1 and rule2 are not compared based on salience. Because rule1 has a
>> smaller act#, it is always fired first.
>>
>> The attached zip is a test case. If you want mvn clean test, it will
>> fail. However, if you remove the following lines from Sample.drl, the test
>> will succeed.
>>
>> "declare Message
>>     @role(event)
>> end"
>>
>> Thanks.
>>
>> Jinghai
>>
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>
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