CODEWITHSUNDEEP
droolsdrools-guvnordrools-flow
Harsha
Harsha

Reputation: 86

Unable to update the fact even when rule is fired

I have implemented builder design pattern and I have conditions on the abstract class and want to update the fact that extends the abstract class. Although the rule is fired but it doesn't update the fact why?

DRL

rule "Rule_1"
    when
        $a : AnotherClas.Builder()
        $b : AnotherClas(definitionName = "test") from $a.build

    then
       $b.setUpdateFact("updated");
   
    end

JAVA CLASS

public abstract class TestClass{
    public final String definitionName;

       protected TestClass(String definitionName) {
            this.definitionName = definitionName;
        }
}

ANOTHER JAVA CLASS

public class AnotherClass extends TestClass{

    private String updateFact;

    private TestClass(String reviewDefinitionName) {
        super(reviewDefinitionName);
    }

    public void setUpdateFact(String updateFact) {
        this.updateFact= updateFact;
    }
   
    public void getUpdateFact() {
        return updateFact;
    }

    public static class Builder {
    private String definitionName;
   
    public TestClass build() {
        return new TestClass(definitionName);
    }

    public Builder definitionName(String definitionName) {
        this.definitionName = definitionName;
        return this;
     } 
   }
 }

Is there anything I am missing? please help me with the correct way to implement this

Upvotes: 1

Views: 343

Answers (1)

tarilabs
tarilabs

Reputation: 2398

Your method AnotherClass.Builder.build() is creating a new instance of an object which is not inserted into the Working Memory or a DataSource. That's the reason why call of modify does not sort any effect.

First you bind $a to a static Builder:

$a : AnotherClas.Builder()

then in the from $a.build the method is invoked:

    public ReviewBatchConfig build() {
        return new ReviewBatchConfig(definitionName);
    }

as the above implementation shows this is not inserted in the WM/DS so missing the API requirements.

You could maybe consider using the builder pattern in the code before invoking the rule engine API, once from the builder pattern all objects are known in your code, you insert those in the WM/DS and invoke rule engine rules.

Upvotes: 1

Related Questions