Dynamic Facts in Rule Unit

[Mani Kandan]

Hi all,
I’ve been working with Drools DRL 8.44 and recently started experimenting with Rule Units. In my current implementation, the facts are dynamic — their classes are only known at runtime. To handle this, I’ve created a RuleFact class that wraps the actual fact as an Object.
In the traditional KieSession approach, I insert these wrapped facts using a BatchCommand before executing the session. Now, I’m trying to replicate a similar approach using Rule Units. 

But I am unable to parse dataSources value in DRL. I am not able to find any example for such implementation, I took some inspiration from https://github.com/kiegroup/drools/blob/main/drools-ruleunits/drools-ruleunits-dsl/src/main/java/org/drools/ruleunits/dsl/SyntheticRuleUnit.java

Any help on how I can do this.

Note:
I have many DRL that I load from DB. each DRL has its own facts. And use same RuleUnitData class for all using NamedRuleUnitData



##################

public class VirtualRuleUnit implements NamedRuleUnitData {

private final String unitName;

private final Map<String, DataSourceDefinition> dataSources;

VirtualRuleUnit(String unitName, Map<String, DataSourceDefinition> dataSources) {
this.unitName = unitName;
this.dataSources = dataSources;
}

@Override
public String getUnitName() {
return unitName;
}

public Map<String, DataSourceDefinition> getDataSources() {
return dataSources;
}

rule "Print SimpleFact per fact"
salience 0
when
$d : /dataSources
$sf : SimpleFact() from $d.get("SimpleFact")
then
System.out.println("Print SimpleFact per fact triggered." + $sf);
end

[Toshiya Kobayashi]

Hello,

Firstly, I strongly recommend to upgrade to the latest 10.x version (10.1.0).

I created an example with RuleUnit and a wrapper fact.

https://github.com/tkobayas/kiegroup-examples/tree/master/Ex-ruleunit-wrapperFact-10.1

I hope it helps.

Cheers,
Toshiya

2025年10月28日火曜日 5:51:35 UTC+9 iamm...@gmail.com: