[rules-users] Questions about logically justified objects

[Geoffrey De Smet]

Let's say I have 2 rooms:
  - Room A with penalty 10
  - Room B with penalty 5
Both are inserted into the WM and never change.
Let's say I have 1 exam:
  - Exam X which starts out assigned to Room A.
It's inserted into the WM, but it will change when rules are fired.

Let's say I have this rule:

rule "roomPenalty"
   when
     $exam : Exam();
   then
     Object cause = $exam;
     int weight = $exam.getRoom().getPenalty();
     insertLogical(new Penalty(cause, weight);
end

After my first fireAllRules, there is 1 logical asserted Penalty(10).

Next, I switch Exam X to Room B (instead of Room A) and I fire all Rules.
The _same_ rule applies on the _same_ fact and a logical asserted 
Penalty(5) is inserted.

How do I enable the following different use cases?

1) Keep Penalty(10), discard Penalty(5)
2) Remove Penalty(10), add Penalty(5)
3) Keep Penalty(10), add Penalty(5)

What happens if:
1) Penalty's equals/hashcode only uses "cause"?
2) Penalty's equals/hashcode uses both "cause" and "weight"?

-- 
With kind regards,
Geoffrey De Smet