Business Rule in Camunda?

[Thong Huynh Trung]

Hi,

How do you handle Business Rule in Camunda? By business rule, I mean stuff like Drools Guvnor (http://www.jboss.org/drools/drools-guvnor.html) which allows you to separate business rules from the process application. 

Thanks

Thong Huynh

[Bernd Rücker (camunda)]

Hi Thong.

 

I personally believe strongly in a best-of-breed approach. Meaning Business Rules are best handled by a Business Rules Management System (BRMS) – e.g. Drools. So best is to hook in Drools when you need it within the process application – as stateless service (from a SOA point of view I think it should even does not matter if you call the rule engine from within a process or from any service in your system).

 

So we normally leverage the BPMN 2.0 Business Rule Task (http://docs.camunda.org/api-references/bpmn20/#!/tasks/business-rule-task) to hook in logic to call the BRMS. On the Business Rule Task you can add any Java logic to make that integration. For Drools it is actually pretty straight forward, we have two examples showing this: https://github.com/camunda/camunda-bpm-examples/tree/master/order-confirmation-rules & https://github.com/camunda/camunda-bpm-examples/tree/master/twitter-drools. In both cases we used the plain drools rule engine and created the rule base within the application. This could be done more sophisticated in a real application or you can simply connect to Guvnor. It is just a few lines of code which you get on the drools docs. This works pretty well in our various real-life-projects with Drools…

 

Hope that helps?

 

Cheers

Bernd

Evangelist & Consultant

www.camunda.org/community/team.html

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[Thong Huynh Trung]

It really does! Thank you

[venkataraju...@gmail.com]

Hi,

Am working on a POC with droools and stop by here for reference. Seems the links provided are not available now, 

https://github.com/camunda/camunda-bpm-examples/tree/master/order-confirmation-rules & 

https://github.com/camunda/camunda-bpm-examples/tree/master/twitter-drools

Would be a great help if you could provide me the links modified.

Thanks & Regards,

VenkataRaju Nandam

[Sebastian Menski]

Hi,

I think the links are now:

https://github.com/camunda/camunda-consulting/tree/master/one-time-examples/order-confirmation-rules

https://github.com/camunda/camunda-consulting/tree/master/one-time-examples/twitter-drools

Cheers,

Sebastian

[Bernd Rücker]

Hi Thong.

 

Wow – you had a serious delay in your evaluation ;-) Did you see that we introduced DMN decision tables with the latest release in Camunda? So you might not even need drools any more?

 

Cheers

Bernd

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[Thong Huynh Trung]

Hi Bernd,

Thanks for your email but this is a very old thread isn't it? Looking at the date when I raised this question, it was June 2013! 

I know that Camunda now has DMN so this question should be no more relevant. 

Thanks anyway,

Thong

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Thong Huynh 

Couture Consulting (Vietnam)  
10 Pho Quang Street, 2nd Ward

Tan Binh District, #B909 
Ho Chi Minh city, Vietnam 
  
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[venkataraju...@gmail.com]

Hi Sebastian,

Thanks for sharing me the active links for Rules Engine workout.

Also thanks for Bernd for suggestion on DMN tables and Thong.

Thanks & Regards,

VenaktaRaju Nandam