JBoss Drools

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

To the Point

Business Flow

Examples: Accounting

Salary

Taxes

CashAid

Laws

FeesIncome

Examples: Sales

Warehouse

Order

Terms

VIP

Destination

Examples: Insurance

AccidentHistory

FeeAttributes

CaseStatistics

Payment

VIP

Vogue

Sudden Change Request?

Sudden Change Request?

What Next?

Level 10

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 {...}

}

Level 40

Rule

Context

RuleConfig

RuleRunner

Data

Level 80

Production Rule System

Rule

WorkingMemory

KnowledgeBase

RuleEngine

Facts

Expert System

Rule

Rule

Rule

Rule

1Decision Block

Decision Block

Decision Block

Decision Block

Result

Assumptions

Time Redundancy

Structural Similarity

Rete Algorithm

Dr Charles L. Forgy

1974, 1979, 1982

JBoss Drools

http://www.jboss.org/drools/team.html

Drools Guvnor

Drools Flow

Drools Expert

Drools Fusion

Drools Planner Drools Grid

LHS? RHS?

Left Hand Side Right Hand Side

LHS? RHS?

Left Hand Side Right Hand Side

IF THEN

LHS? RHS?

Left Hand Side Right Hand Side

IF

WHEN

THEN

THEN

Rule Structure

rule “<unique name>”

[<rule attributes (grouping, priority, etc)>]

when

then

[<LHS (can be zero or more conditions)>]

[<RHS (can be zero or more commands)>]

end

Demo

Links

● https://github.com/victor-cr/jeeconfua-drools-example

● https://github.com/victor-cr/uadev-drools-example

● http://www.jboss.org/drools/documentation