Drools is actually made up of several other projects like Guvnor (Business Rules Manager), Expert (rule engine), 5jBPM 5 (process/workflow), Fusion (event processing/temporal reasoning) and Planner (automated planning).
Here are some key features of "Drools":
Engine features:
· Full Rete Implementation -with high performance indexing
· Dynamic RuleBases
· Stateful and Stateless Execution Modes
· Async operations
· Rete and Sequential Rete
· Rule Agent
· Optional Data Shadowing
· Pluggeable Dialects
Propositional Logic features:
· Literal Restriction
· Variable Restriction
· Return Value Restriction
· Jointed and dis-jointed Connectives allowed '&&' '||'
· inline-Eval
First Order Logic (Quantifiers) features:
· And
· Or
· Exists
· Not
· Accumulate
· Collect
· From
· Forall
· Nesting of any CE inside of 'and' and 'or'
· Support for both infix and prefix 'and'/'or' CEs
· Nesting and Chaining of 'from', 'accumulate', 'collect'
Execution Control features:
· Conflict Resolution (salience) Now pluggeable
· Agenda Filters
· Agenda Groups
· Activation Groups
· Rule Flow
· Attributes (no-loop, lock-on-active)
· Temporal Rules
· Scheduler for rule duration will fire when a rule is true for X duration
· Truth maintenance with Logical Insertions
Event Model features:
· Working Memory, Agenda and Rule Flow
· Configurable
· All Rete optimizations and execution behavior can be configured
· Authoring
· Technical rules: DRL and XML formats supported
· Template based DSLs
· Guided Editor
· BRMS and Eclipse
· Decision Tables (Excel, Open Office)
· BRMS (Knowledge Asset Management System)
· Authoring and Storage DRLs, RuleFlows, Decision Tables, Business Rules (Guided Editor)
· Multi level Versioning, at both the rule and package level
· Classification
· Deployment
· Built on Standards and Open APIs JCR (JSR 170) Dublin Core, GWT
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