How to set the AgendaGroup in StatelessKieSession drools

Question

I have a scenario where I want to use the StatelessKieSession with the agenda group. The StatelessKieSession doesn't have any method to set focus on a particular AgendaGroup like normal KieSession as shown below

KieContainer kContainer = ks.newKieContainer(kr.getDefaultReleaseId());
KieSession kSession = kContainer.newKieSession();
kSession.getAgenda().getAgendaGroup("us").setFocus();

How to set a focus on a particular agendaGroup using the StatelessKieSession ?

Answer 1

You can set Agendagroup in StatelessKieSession by using drools.setFocus() method in your drl file. One thing you have to do explicitly is to declare a variable in your Fact object and assigned agendaGroup name to that variable. Example rule will be like :

rule "global" salience 100 when $rec : FactObject() then drools.setFocus($rec.getAgendaValue()); end

Give this rule a high salience value so that it gets executed first. Check this blog. They are doing the same that you are trying to do.

Answer 2

For StatelessKieSession, you can set AgendGroup and Activation Group as part of Commands

final List<Command> commands = newArrayList();
ClearActivationGroupCommand  activationGroup = new ClearActivationGroupCommand("Test");
commands.add(activationGroup);
AgendaGroupSetFocusCommand agendaGroup = new AgendaGroupSetFocusCommand("Test");
commands.add(agendaGroup);
final FireAllRulesCommand fireAllRulesCommand = new FireAllRulesCommand();
commands.add(fireAllRulesCommand);
final BatchExecutionCommand command = CommandFactory.newBatchExecution(commands);

final StatelessKieSession  session = kieContainer.newStatelessKieSession();
ExecutionResults executionResultsSupplier =  session.execute(command);
result.setExecutionResult(executionResultsSupplier);