Drools Filip notes

Preparing jbpm installer

• copy jbpm-installer.full.fresh to jbpm-installer

Adding German keyboard in Ubuntu

• cogwheel -> System Settings -> Keybord layout -> Add

Adding clipboard sharing

KIE

No internet solution

Connection to the internet is required (downloading examples from git repository)

• go to jbpm-installer folder
• open build.xml in text editor
• find kie.demo
• change all values to false

<arg value="-Dorg.kie.demo=false" />

• in a console type (remove GIT repository)

rm .niogit/ -R -f

• start demo again

Important java command :)

killall java

Ex1

http://training-course-material.com/training/Drools_Kie_-_Example

Eclipse

Frist Rule

package np01stateless
import com.nobleprog.Applicant;
rule "Is of valid age"
when
  $a : Applicant( age < 18 )
then
  $a.setValid( false );
end

when
 $a : Applicant( age < 18 )

2 conditions:

• there is an Applicant
• whose age is < 18

We don't need to use '$'

Shopping Cart Exercise

Show TDD

• Create test first (modify previous example)

ShoppingCart sc = new ShoppingCart(12000.00);
 assertFalse( sc.getDiscount() == 0.1);
 kSession.execute( sc );
 assertTrue( sc.getDiscount() == 0.1);

• Add Java class
  • Generate setters/getters

If you want to test more ShoppingCart objects you can:

• execute the rule twice or more
• use some kind of structure - list to pass objects
• create another test method

Modify totalPrice

• truth maintenance

How to avoid it:

• no-loop attribute (between rule and when)
• create flag (another field in the Class) e.g. discountApplied=true/false