Rules Engine Question

Question

Hello All,
I am trying to put together a very simple service that uses the Oracle Rules engine, but I can't seem to get anything to happen.
I have set up a class called ScheduleValidity which has three attributes, hour, message, and isValid. The idea is that you pass an instance of this into the rule engine as a fact with the hour set, and then have the rules engine set isValid and the message. When I call the engine however, the object that I am asserting is not being changed. I am sure that I am doing something obviously incorrect, but I can't figure it out.
The RL for the two rules that I have are:
rule checkThatTimeisLateEnough
priority = 0;
if
fact mil.navy.seawarrior.scheduler.ScheduleValidity v0_ScheduleValidity && (
(v0_ScheduleValidity.hour < 9 )))
v0_ScheduleValidity.isValid = false ;
v0_ScheduleValidity.message = "The time is too early" ;
v0_ScheduleValidity.setIsValid(false );
v0_ScheduleValidity.setMessage("Time is too early" );
assert(v0_ScheduleValidity);
} //end rule checkThatTimeisLateEnough;
rule timeIsOk
priority = 0;
if
fact mil.navy.seawarrior.scheduler.ScheduleValidity v0_ScheduleValidity && (
(v0_ScheduleValidity.hour >= 9 )))
v0_ScheduleValidity.isValid = true ;
v0_ScheduleValidity.message = "This time is OK" ;
v0_ScheduleValidity.setIsValid(true );
v0_ScheduleValidity.setMessage("this time is OK" );
} //end rule timeIsOk;
The Web Services code that I am using is:
RuleRepository repository = RepositoryManager.getDefaultRepository("D:\\OC4J10.1.3\\j2ee\\home\\SchedulerRulesTest\\");
String rules = (repository.loadDictionary("SchedulerRulesTest",null)).ruleSetRL("SchedulerRulesTestRS"); //.getRuleSet("SchedulerRulesTestRS").generateRL(null);
String dm = (repository.loadDictionary("SchedulerRulesTest",null)).dataModelRL();
RuleSession rs = new RuleSession();
rs.executeRuleset(rules);
rs.executeRuleset(dm);
Calendar cal = new GregorianCalendar();
cal.setTime(startDateTime);
ScheduleValidity sv = new ScheduleValidity();
sv.setHour(cal.get(Calendar.HOUR_OF_DAY));
sv.setMessage("Default message");
System.out.println("hour:" + sv.getHour());
rs.callFunctionWithArgument("assert",sv);
rs.callFunction("run");
OperationStatus returnOs = new OperationStatus();
returnOs.setMessage(sv.getMessage());
returnOs.setSuccess(sv.isIsValid());
Unfortunately, the sv object's attributes are never being set. Can anyone give me an idea what I am going incorrectly?
Thanks

Answer 1

It isn't required that the ruleset be called main. There are two ways to get your ruleset (as originally named) to be evaluated. The pushRuleset function can be used to push the ruleset onto the ruleset stack or the run function may be invoked with a ruleset name argument. In code either:
rs.callFunctionWithArgument("pushRuleset", "SchedulerRulesTestRS");
rs.callFunction("run");
or
rs.callFunctionWithArgument("run", "SchedulerRulesTestRS");
The first approach is documented in the "Oracle Business Rules Users Guide" in section 2.7.4. For some more info on the ruleset stack, see section 1.4.3 in the "Oracle Business Rules Language Reference".