[rules-users] A basic doubt about Drools Fusion

[Adrián Paredes]

Thank you, Esteban.

You are right! If I insert two events A:

rulesTest.addEventA("123");
rulesTest.addEventA("456");

The second call of fireAllRules() activates the rule for the first object:

Event inserted com.epidataconsulting.drools.model.EventA
Event A 123 at Fri Dec 07 11:54:21 ART 2012
Event inserted com.epidataconsulting.drools.model.EventA

But not for the second.

How I can do to correct this behavior?

Thanks!

Adrian

2012/12/7 Esteban Aliverti <esteban.aliverti at gmail.com>

> It could be the case, and I'm guessing here, that the AgendaEventListener
> is called just before the activation is placed into the agenda. So, the
> call to fireAllRules() finds an empty agenda. What you could do to check if
> this is what is happening, is to insert 2 EvenA objects. The second call of
> fireAllRules() should fire the activation of the first object (and you will
> miss the activation of the second).
>
> Best Regards,
>
>
>
>
> XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
>
> Esteban Aliverti
> - Blog @ http://ilesteban.wordpress.com
>
>
>
> On Fri, Dec 7, 2012 at 1:55 PM, Adrián Paredes <
> adrianp at epidataconsulting.com> wrote:
>
>> Hi all:
>>
>> I have a very basic doubt about Drools Fusion.
>>
>> I have two simple Java classes:
>>
>> EventA  {
>>     String id;
>>     Date timestamp;
>>     Long duration;
>> }
>>
>> EventB {
>>     String id;
>>     Date timestamp;
>>     Long duration;
>> }
>>
>> I have a DRL file, where I declare this two classes as Events:
>>
>> declare EventA
>>     @role(event)
>>     @timestamp(timestamp)
>>     @duration(duration)
>> end
>>
>> declare EventB
>>     @role(event)
>>     @timestamp(timestamp)
>>     @duration(duration)
>> end
>>
>> I have a simple rule:
>>
>> rule "Basic Rule"
>> dialect 'mvel'
>> when
>>     $eventA: EventA($aId: id) from entry-point "time stream"
>> then
>>     System.out.println("Event A " + $aId + " at " + $eventA.timestamp);
>> end
>>
>> Finally, I have a test that starts a StatefulKnowledgeSession in STREAM
>> mode, register an eventLister in the session in order to fire the rules
>> when an event arrives:
>>
>> ksession.addEventListener(new DefaultAgendaEventListener() {
>>     @Override
>>     public void activationCreated(ActivationCreatedEvent event) {
>>         ((StatefulKnowledgeSession)
>> event.getKnowledgeRuntime()).fireAllRules();
>>     }
>> });
>>
>> And then the test insert in the "time stream" entry-point an instance of
>> EventA with duration of 10 miliseconds, as follows:
>>
>> EventA eventA = new EventA();
>> eventA.setId("123");
>> eventA.setTimestamp(new Date());
>> eventA.setDuration(10L);
>> ksession.getWorkingMemoryEntryPoint("time stream").insert(event);
>>
>> At the end of the test, I have an sleep of 2 seconds just in case.
>>
>> I don't understand why the "Basic Rule" never fires.
>>
>> But if I add another condition to the same rule, something like this:
>>
>> rule "Basic Rule"
>> dialect 'mvel'
>> when
>>     $eventA: EventA($aId: id) from entry-point "time stream"
>>     not EventB($aId == id, this after [0s,5s] $eventA) from entry-point
>> "time stream"
>> then
>>     System.out.println("Event A " + $aId + " at " + $eventA.timestamp);
>> end
>>
>> The rules fires and I see this message in console:
>>
>> Event A 123 at Fri Dec 07 09:48:59 ART 2012
>>
>> I don't understand why the first rule, that is more open, don't fire, and
>> the second rule, that is more restrictive, fires without problems.
>>
>> Thank you very much!
>>
>> Greetings,
>> Adrian.
>>
>> --
>> *Epidata Consulting | Deploying Ideas
>> Ing. Adrián M. Paredes | Arquitecto Desarrollador
>> adrianp at epidataconsulting.com | Cel: (54911) 3297 1713
>>
>> ----------------------------------------------------------------------------------------------------------------------------
>> Argentina: Maipú 521 Piso 1 Of. A | Buenos Aires | Of: (5411) 5031 0060
>> Chile: Apoquindo 3600 Piso 7 y 9 | Las Condes - Santiago | Of: (+56) 2
>> 495 8450
>>
>> ---------------------------------------------------------------------------------------------------------------------------
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>>
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>>
>
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-- 
*Epidata Consulting | Deploying Ideas
Ing. Adrián M. Paredes | Arquitecto Desarrollador
adrianp at epidataconsulting.com | Cel: (54911) 3297 1713
----------------------------------------------------------------------------------------------------------------------------
Argentina: Maipú 521 Piso 1 Of. A | Buenos Aires | Of: (5411) 5031 0060
Chile: Apoquindo 3600 Piso 7 y 9 | Las Condes - Santiago | Of: (+56) 2 495
8450
---------------------------------------------------------------------------------------------------------------------------
 www.epidataconsulting.com
 Linkedin <http://bit.ly/epidatalinkedin> |
Facebook<http://www.facebook.com/epidata.consulting>
 | Twitter <http://twitter.com/epidata>
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