Rules with Drools
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The document introduces Drools, an open source rule engine platform. It discusses some problems with implementing rules in Java and how Drools addresses these issues. It provides examples of rules in Drools and how the RETE algorithm works behind the scenes. The document also outlines when not to use Drools and lists some alternative rule engine options.
Rules with Drools
- 1. Rules with Drools Gaurav Kohli Saket Vishal
- 3. What about this? Akshay Kumar, 32, Chandini Chowk, Delhi, 110006
- 4. Lets talk about Akshay Kumar
- 5. Some rules on names First Name + Last Name First Name + First Name + Last Name (First Name)+ + Last Name First Name + First Name Saket Vishal
- 6. Implementing these rules in Java
- 7. Demo
- 8. Problems in implementing with Java Frequent changes to rules(conditions) Lack of centralization of rules Difficult to analyse and manage Non technical people(Business Analysts ..) can't create/update rules Performance
- 9. Introducing Drools Basically, a rule engine Rule Engine: Platform that provides functionality to manage rules Rule: An if else condition (Business Logic)
- 10. Rules in Drools
- 11. Demo
- 12. The Big Picture
- 13. Back to rules in Drools DSL Domain Specific Languages Human readable rules
- 14. Demo
- 16. Behind Drools
- 17. When not to use Drools If your business logic is well defined/static and doesn't change often, you don't need to change rules at run-time. If your rules are simple, self-contained, and usually spanning only a single object (for example, a check that user's age is less than 21). If you have a memory constrained environment. If your project is a one-shot effort and it will never be used again or maintained over time.
- 18. Alternatives to Drools ILOG (now IBM)JRules Fair IsaacBlaze Advisor Corticon's BRMS, Haley (now Oracle) Business Rules Engine PegasystemsPegaRules, Production Systems TechnologiesOPSJ CLIPS OpenRules or Jess
- 19. Advanced Drools Drools Flow Loan approval Drools Fusion Fraud detection Drools Guvnor BRMS
- 20. ?
- 21. References Drools http://www.jboss.org/drools Drools JBoss Rules 5.0 Developer's Guide RETE http:// en.wikipedia.org/wiki/Rete_algorithm
- 22. Thank You!