[jBPM5.1] How to use drools rule in constraints of a gateway

[diorbert]

Many examples that i found use a rule file that contains business rules that when evaluated changes the value of some variables  to choice of path (by a boolean expression), but i still not found some example that use a drools rule inside the gateway constraint and i cant imagine how the drools rule will set a boolean value to gateway select your path.

How to do that ?

Thanks

[jbpm_new]

Hi Pereira,

AM also looking for something similar. Want to route based on a DRL file. Do you have any examples ?. Please share. Thanks

[swiderski.maciej]

Here is an example for executing rule base syntax on sequence flow condition:

     <sequenceFlow id="_9-_10" sourceRef="_9" targetRef="_10" name="sq-name">
      <conditionExpression xsi:type="tFormalExpression" language="http://www.jboss.org/drools/rule" >eval(false)</conditionExpression>
    </sequenceFlow>

where eval(false) is rule syntax to be executed, please keep in mind that it must return boolean.

HTH

[diorbert]

To use a rule constraint in a gateway you must think in LHS of a drools rule, i.e, the constraint is a drools condition, an example:

There is a class "Person" with a attribute "age", and we would like know if a person is majority, then...

-> First Constraint

Person(age >= 18)

-> Second Constraint

Person(age < 18)

Excuse my english.