Op 07-12-12 08:29, Michiel Vermandel schreef:

Hi,

I would like to read some documentation on how the rules engine (specifically for planner) works.
I have a number of unanswered questions.

Some type of questions:

- If I have two rules in my drl file, will the engine execute first the first rule with all possible combinations of the planning entities matching the conditions of the rule
and then the second rule with all possible combinations of the planning entities matching the conditions of the rule

the order depends on the rule agenda, see drools expert manual
http://docs.jboss.org/drools/release/5.5.0.Final/drools-expert-docs/html_single/index.html

- Can I trace which rules are executed with what planning-variables and in which order

You can put System.out.println() in the RHS.
Drools expert does not support TRACE logging to support this for you currently.
If you would like this, vote for this issue:
https://issues.jboss.org/browse/JBRULES-3702

- What is the purpose of the last variable amount of parameters ($x, $y, $z) in the RHS logic insertLogical(new IntConstraintOccurrence( ... , $x, $y ,$z))

Those "causes" is to keep Drools Expert's insertLogical's behaviour happy because an IntConstraintOccurrence's equals/hashcode is called so only 1 can be in the working memory.
Basically, they explain what caused that part of the score. It's interesting if you want to use them to explain why a solution has a certain score.
But, on the other hand, it's a PITA and I am working on an alternative that's easier to use and faster, once drools expert supports ChangeMatchListeners.

In any case, it's a valid issue that the docs don't explain this causes thing.

I know there is http://docs.jboss.org/drools/release/5.5.0.Final/drools-planner-docs/html_single/index.html but it does not really answer the above questions.

Thanks,

Michiel

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