CODEWITHSUNDEEP
drools
Ganesh
Ganesh

Reputation: 11

how to stop looping in drools rule?

I am using guided rule in business central, Modiying the fact in action part with no-loop true . Still the looping is happening . when I use lock-on-active the rule do not run at all. Please help.

rule "today true and close time is before 15pm"
    dialect "mvel"
    salience 120
    ruleflow-group "gogo"
    no-loop true
    lock-on-active true
when
    v : VendorWorkingDays( eval( vendorWD contains(java.time.LocalDate.now().plusDays(1).getDayOfWeek().toString()) )&& todayFlag == true && eval( closeTime.isBefore(java.time.LocalTime.parse("15:00:00")) ))
then
    modify( v ) {
        setTodayOneE( "NA" ),
        setTodayOneM( "Available" ), 
        setTodayOneFlag( true )
    }
    System.out.println("today true and close time is before 15pm");
end

Upvotes: 1

Views: 917

Answers (1)

Esteban Aliverti
Esteban Aliverti

Reputation: 6322

You may want to take a look at this other question: what is the difference between no-loop and lock-on-active in drools

In your case, the use of modify is causing the rules related to the VendorWorkingDays to be re-evaluated. The use of no-loop only works for when you have a single rule looping. I guess that in your case, you may have multiple rules involved in the infinite loop. The use of lock-on-active will prevent the execution of this rule if the VendorWorkingDays is being inserted into the session (or modified) from another rule.

There is a link to a blog post in the question I mentioned that will give you a better explanation about these two attributes (the blog post is quite old, but the principles are still more or less valid for the latest version of Drools).

Upvotes: 1

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