[rules-users] Optaplanner - Issue with real-time, chained and shadow variables
Juan Ignacio Barisich
juan.barisich at gmail.com
Tue Nov 5 06:50:06 EST 2013
Thanks Geoffrey
I solved this problem. In case anyone is interested, I have attached the
fixed test with your suggestions.
Best regards
2013/11/4 Geoffrey De Smet <ge0ffrey.spam at gmail.com>
>
> On 04-11-13 14:24, Juan Ignacio Barisich wrote:
>
> You are right.
> Do you think that is a bug? Or is there a hack to solve this?
>
> User problem :)
> Do something like:
>
> toRemove.getPreviousStandstill().setNextStandstill(toRemove.getNextStandstill);
>
> toRemove.getNextStandstill().setPreviousStandstill(toRemove.getPreviousStandstill);
> It might need a cast and instanceof check to Customer.
>
>
>
> 2013/11/4 Geoffrey De Smet <ge0ffrey.spam at gmail.com>
>
>>
>> On 04-11-13 13:10, Juan Ignacio Barisich wrote:
>>
>> Geoffrey, thanks for response.
>> The the Customer "toRemove" instance IS the same instance as which is
>> in the workingSolution's Customer list. In fact, in the test example I have
>> attached, I get that instance via:
>>
>> final Customer toRemove = workingSolution.getCustomerList().get(0);
>>
>> Ok, then that's not the problem indeed.
>>
>>
>> I try to reproduce the hack in CloudBalancing's problemFactChange
>> implementation, but with no success. I mean, I tried:
>>
>> // to clean the next variable of previous in the chain
>> Standstill prev = toRemove.getPreviousStandstill();
>> scoreDirector.beforeEntityRemoved(prev);
>> prev.setNextCustomer(null);
>> scoreDirector.afterEntityRemoved(prev);
>>
>> but this throw an exception like:
>> java.lang.IllegalStateException: The entity (1(after 66)) has a variable
>> (previousStandstill) with value (66(after 51)) which has a mappedBy
>> variable (nextCustomer) with a value (null) which is not that entity.
>>
>> Ah, that explains it.
>>
>> Although you remove the customer instance toRemove,
>> one of the other customers still has it as previousStandstill
>> and/or one of the other customers still has it as nextStandstill.
>>
>>
>> Also, i try to clean the previous variable of the following item in the
>> chain:
>>
>> // to clean the previous variable of the following customer in the
>> chain
>> Customer nextCustomer = toRemove.getNextCustomer();
>> if (nextCustomer != null) {
>> scoreDirector.beforeEntityRemoved(nextCustomer);
>> nextCustomer.setPreviousStandstill(null);
>> scoreDirector.beforeEntityRemoved(nextCustomer);
>> }
>>
>> but this throw an exception like:
>> java.lang.IllegalStateException: The ScoreDirector (class
>> org.optaplanner.core.impl.score.director.common.TrailingEntityMapSupport)
>> is corrupted, because the entity (10(after null)) for chained
>> planningVariable (previousStandstill) cannot be retracted: it was never
>> inserted.
>>
>> Can you take a look to the test I have attached and guide me to solve
>> this?
>>
>> Thanks a lot.
>> Regards
>>
>>
>>
>>
>>
>>
>>
>> 2013/11/4 Geoffrey De Smet <ge0ffrey.spam at gmail.com>
>>
>>>
>>> On 01-11-13 19:38, Juan Ignacio Barisich wrote:
>>>
>>> Hi everybody
>>> I am using optaplanner in real-time style. My application domain is
>>> similar to the "Vehicle Routing" example (
>>> http://docs.jboss.org/drools/release/6.0.0.CR5/optaplanner-docs/html_single/index.html#vehicleRouting).
>>> I mean, I am using chained variables and shadow variables. I have a problem
>>> while trying to remove a fact (an entity), via a ProblemFactChange:
>>>
>>> java.lang.IllegalArgumentException: The entity instance (...) was never
>>> added to this ScoreDirector. Usually the cause is that that specific
>>> instance was not in your Solution's entities.
>>>
>>> The fact removing that I made is like:
>>>
>>> solver.addProblemFactChange(new ProblemFactChange() {
>>>
>>> @Override
>>> public void doChange(ScoreDirector scoreDirector) {
>>> ...
>>> scoreDirector.beforeEntityRemoved(toRemove);
>>> workingSolution.getCustomerList().remove(toRemove);
>>>
>>> the remove() method will make no difference because the Customer
>>> "toRemove" instance
>>> is not the same instance as which is in the workingSolution's Customer
>>> list.
>>>
>>> See the CloudBalancing's PRoblemFactChange implementation how to solve
>>> this.
>>> And one of the warnings in the Real-time planning section of the docs to
>>> understand it better:)
>>>
>>> scoreDirector.afterEntityRemoved(toRemove);
>>> }
>>> });
>>>
>>> I think the problem is there. Do you know what I'm doing wrong?
>>> I have attached a test case based on the "Vehicle Routing". To run it,
>>> just put that file into the
>>> optaplanner-distribution-6.0.0.CR5/examples/sources/src/test/java/org/optaplanner/examples/vehiclerouting/app/
>>> directory.
>>>
>>> <http://drools.46999.n3.nabble.com/file/n4017760/serverlog.zip>I'd
>>> appreciate any ideas on how to resolve this.
>>> Best regards,
>>>
>>> Juan Ignacio Barisich
>>>
>>>
>>>
>>>
>>>
>>>
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>>
>>
>>
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