1. JBoss Drools

2. Who am I?
● Victor Polischuk
● A man with a terrible character.
● Java architect, team leader and coach.
● 10+ years of software development experience.
● 8+ years of Java experience.
● 2+ years of Drools usage.
● Employed at Infopulse

3. To the Point

5. Business Flow

6. Examples: Accounting
Cash
Aid
Salary Fees
Income
Taxes Laws

7. Examples: Sales
Warehouse VIP
Order
Terms Destination

8. Examples: Insurance
Accident
Payment
History
Attributes VIP Fee
Case
Vogue
Statistics

9. Sudden Change Request?

10. Sudden Change Request?

11. What Next?

12. Level 10

13. if (…) {
if (…) {
if (…) {…}
if (…) {…} else {...}
} else if (…) {
if (…) {…} else {...}
} else {
throw new Exception(...);
}
} else if (…) {
if (…) {
if (…) {…}
} else {
if (…) {…}
}
if (…) {
if (…) {…} else {...}
} else {
if (…) {…}
}
} else {
if (…) {…} else {...}
}

14. Level 40

15. Rule RuleConfig
Context RuleRunner
Data

16. Level 80

18. Production Rule System

19. Rule KnowledgeBase
WorkingMemory RuleEngine
Facts

20. Expert System
Decision Block 1 Rule
Decision Block Rule
Decision Block Rule
Decision Block Rule
Result

21. Assumptions
Time Redundancy
Structural Similarity

22. Rete Algorithm
Dr Charles L. Forgy
1974, 1979, 1982

23. JBoss Drools
Drools Guvnor Drools Expert
Drools Flow Drools Fusion
Drools Planner Drools Grid
http://www.jboss.org/drools/team.html

24. LHS? RHS?
Left Hand Side Right Hand Side

25. LHS? RHS?
Left Hand Side Right Hand Side
IF THEN

26. LHS? RHS?
Left Hand Side Right Hand Side
IF THEN
WHEN THEN

27. Rule Structure
rule “<unique name>”
[<rule attributes (grouping, priority, etc)>]
when
[<LHS (can be zero or more conditions)>]
then
[<RHS (can be zero or more commands)>]
end

28. Demo

29. Links
● https://github.com/victor-cr/jeeconfua-drools-example
● https://github.com/victor-cr/uadev-drools-example
● http://www.jboss.org/drools/documentation