How to fire rules based on the ruleflow-group?

Issue

If using code below for firing rules:

   kSession.fireAllRules(new AgendaFilter()
            {
                public boolean accept(Match match)
                {
                    String rulename = match.getRule().getName();
                    System.out.println("RuleName" + rulename);

                    if(rulename.startsWith("CPRule"))  return true;

                    return false;
                }
            });

It is not possible to filter rules based on the ruleflow-group. The main requirement is to categorize rules based on the ruleflow-group and when required, fire set of the rules which belongs to the certain ruleflow-group. How to achieve this?