Javantura v4 - DMN – supplement your BPMN - Željko Šmaguc

1. DMN - supplement your
BPMN
Željko Šmaguc - S.O.E. ICT

2. Agenda
❏ What is a decision and where are the problems
❏ DMN specification and examples
❏ Decision Requirements Diagram
❏ Decision tables
❏ S-FEEL and FEEL
❏ Tools - Drools 7.0

3. Decision
Definition
Determination of output fact value resulting from specified input fact values.
Types
❏ Strategic
❏ Tactical
❏ Operational

4. Decision example
Price calculation
 Telekom - plans, bundles, contracts, prepaid
 Club membership - juniors and veterans
 Faculty - tuition per success
 Music schools - base price, discounts and surcharges

5. How much?

6. How much?

7. How much?

8. How much?

9. Why do we need to model decisions?
❏ Not documented
❏ Not formalized
❏ Not complete
❏ Impossible change management

10. Decisions with BPMN

11. Decisions with BPMN
Why can’t we fit them into a BPMN model?
❏ To complicated, unreadable
❏ Decisions are not time/flow dependent
❏ Changes in decision logic require changes of process/service model
❏ Service/process model is tied to decision logic

12. Decisions with DMN + BPMN

13. DMN Specification
❏ Developed by Object Management Group (OMG)
❏ First release in September 2015, current version 1.1 released in June 2016
❏ Content
❏ Decisions Requirement Diagram
❏ Decision Tables
❏ Friendly Enough Expression Language (FEEL)
❏ Boxed Expressions

14. Conformance levels
Conformance level 1
❏ Decisions requirements diagram
❏ Decisions table
Conformance level 2
❏ Decisions tables executable with S-FEEL
Conformance level 3
❏ FEEL
❏ Boxed Expressions

15. DMN
❏ Decisions Requirement Diagram
❏ Decision Tables
❏ Friendly Enough Expression Language (FEEL)
❏ Boxed Expressions

16. Decision Requirements Diagram
❏ Decisions and theirs interdependency
❏ Required input
❏ Business knowledge and Knowledge source

17. Decision Requirements Diagram

18. DMN
❏ Decisions Requirement Diagram
❏ Decision Tables
❏ Friendly Enough Expression Language (FEEL)
❏ Boxed Expressions

19. Decision Table

20. Decision Table
Hit Policy
Indicator
Single (Unique, Any,
Priority, First)
Multiple (Output and
Rule order, Collect)
Rules in
rows
Rule
number
Input entry Irrelevant Output entry
Allowed
values
Output label
Input
expressions
Inputs and
outputs in
columns

21. Decision Table

22. DMN
❏ Decisions Requirement Diagram
❏ Decision Tables
❏ Friendly Enough Expression Language (FEEL)
❏ Boxed Expressions

23. Friendly Enough Expression Language
❏ S-FEEL
❏ Simplified
❏ Mostly used in decision tables
❏ Limited to simple arithmetic and comparison functions
❏ FEEL
 Full featured expression language
 Built-in functions (arithmetic, string, list…)
 Filter expressions
 Operators
 Sorting

24. DMN
❏ Decisions Requirement Diagram
❏ Decision Tables
❏ Friendly Enough Expression Language (FEEL)
❏ Boxed Expressions

25. Boxed expressions
Name - Value expression pairs
❏ decision table
❏ boxed FEEL expression
❏ boxed invocation
❏ boxed context
❏ boxed list
❏ relation, or
❏ boxed function

26. Drools 7
❏ JBoss
❏ Business Rules Management System
❏ DMN v1.1 Level 3 conformant with version 7.0 (expected release Q1/2017)
❏ XML-based interchange format
❏ https://github.com/droolsjbpm/kie-dmn

27. Drools 7
Example

28. DMN Tools
openjvm.jvmhost.net/DMNtools
www.trisotech.com

29. Conclusion
❏ Supported standard
❏ Business Friendly
❏ B-IT bridge (modeling + logic)
❏ Automated/Executable Operational Decisions
❖ Not yet mature
❖ Lack of few features

30. Thank you!
zeljko.smaguc @ soe.hr