Rule Engine

Drools - steps to use it in a typical program

1. create working memory
2. asset objects (insert into working memory)
3. fire all rules
4. retrieve objects

Rule attributes
- name
- group
- description
- priority

Rules

1. Production rules (inference rules) - if x, then y
2. Reaction Riles - wait for a set of events
3. Stateful

Rete algorithm (Forward Chaining)

1. iterate through antecedants
2. each time an antecedant is matched, add knowledge of consequence
3. do this until goal is reached

Guvnor - Business rules management system