A field was accessed by a rule but was not found in the class

[Kent Zhang]

Hi Team,

 

In the drools script (projectJobSchedulingConstraints.drl) of example Project Job Scheduling, in the LHS of rule "renewableResourceCapacity", for the class RenewableResourceUsedDay, the variable $capacity gets the value from its field "resourceCapaciy", but I don't find this member from this class. How can it get the capacity?  

Thanks.

[Kent Zhang]

I'm saying this rule. Thank you a lot!

rule "renewableResourceCapacity"

    when

        RenewableResourceUsedDay($resource : resource, $capacity : resourceCapacity, $usedDay : usedDay)

        accumulate(

            ResourceRequirement(resource == $resource,

                    $executionMode : executionMode,

                    $requirement : requirement)

            and Allocation(executionMode == $executionMode, $usedDay >= startDate, $usedDay < endDate);

            $used : sum($requirement);

            $used > $capacity

        )

    then

        scoreHolder.addHardConstraintMatch(kcontext, 0, $capacity - $used);

end

[Lukas Petrovicky]

Kent,

On Thu, Jul 15, 2021 at 3:57 AM Kent Zhang <kent...@gmail.com> wrote:

In the drools script (projectJobSchedulingConstraints.drl) of example Project Job Scheduling, in the LHS of rule "renewableResourceCapacity", for the class RenewableResourceUsedDay, the variable $capacity gets the value from its field "resourceCapaciy", but I don't find this member from this class. How can it get the capacity?  

it doesn't need to be a field. In this particular case, it is a method:

https://github.com/kiegroup/optaplanner/blob/master/optaplanner-examples/src/main/java/org/optaplanner/examples/projectjobscheduling/optional/score/drools/RenewableResourceUsedDay.java#L64

However, this brings up a good benefit of using Constraint Streams instead of DRL. Constraint Streams are pure Java, and therefore your IDE gives you all the information you need.

 

--

Lukáš Petrovický

He/Him/His

Principal Software Engineer, Business Automation

Red Hat Czech, s. r. o.

lukas.pe...@redhat.com    IM: triceo/lpetrovi

[Kent Zhang]

Thank you very much, Lukas. I ignored this method getResourceCapacity.

I understand that Constraint Stream can express constraints better. I am planning to change the Drools constraints in the existing project to Constraint Stream, but for the example Project Job Scheduling, I still cannot use Constraint Stream to implement it, especially the constraint renewableResourceUsedDay. The insertLogical method, I don’t know how to implement it in Constraint Stream. Will your team provide Constraint Stream implementation constraints for the example Project Job Scheduling ? Thanks again.

[Lukas Petrovicky]

On Thu, Jul 15, 2021 at 10:34 AM Kent Zhang <kent...@gmail.com> wrote:

I understand that Constraint Stream can express constraints better. I am planning to change the Drools constraints in the existing project to Constraint Stream, but for the example Project Job Scheduling, I still cannot use Constraint Stream to implement it, especially the constraint renewableResourceUsedDay. The insertLogical method, I don’t know how to implement it in Constraint Stream. Will your team provide Constraint Stream implementation constraints for the example Project Job Scheduling ? Thanks again.

We already have. :-) But it happened so recently that it's probably not yet released. See here:

https://github.com/kiegroup/optaplanner/blob/master/optaplanner-examples/src/main/java/org/optaplanner/examples/projectjobscheduling/optional/score/ProjectJobSchedulingConstraintProvider.java

 

[Kent Zhang]

Oh, that's really great, let me learn about it. Thank you, Lukas. 

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With kind regards,

Kent Zhang