2013/1/28 André Fróes <arfmoraes@gmail.com>

this is the full drl file:

------------

package com.swa.planner.domain.rule;

import org.drools.planner.core.score.buildin.hardandsoft.HardAndSoftScoreHolder;

import org.drools.planner.core.score.constraint.IntConstraintOccurrence;

import org.drools.planner.core.score.constraint.ConstraintType;

import com.swa.planner.domain.CloudBalance;

import com.swa.planner.domain.CloudComputer;

import com.swa.planner.domain.CloudProcess;

global HardAndSoftScoreHolder scoreHolder;

rule "requiredCpuPowerTotal"

when

$computer : CloudComputer($cpuPower : cpuPower)

$requiredCpuPowerTotal : Number(intValue > $cpuPower) from accumulate(

CloudProcess (

computer == $computer,

$requiredCpuPower : requiredCpuPower),

sum($requiredCpuPower)

)

then

insertLogical(new IntConstraintOccurrence("requiredCpuPowerTotal", ConstraintType.NEGATIVE_HARD,

$requiredCpuPowerTotal.intValue() - $cpuPower,

$computer));

end

rule "requiredMemoryTotal"

when

$computer : CloudComputer($memory : memory)

$requiredMemoryTotal : Number(intValue > $memory) from accumulate(

CloudProcess (

computer == $computer,

$requiredMemory : requiredMemory),

sum($requiredMemory)

)

then

insertLogical(new IntConstraintOccurrence("requiredMemoryTotal", ConstraintType.NEGATIVE_HARD,

$requiredMemoryTotal.intValue() - $memory,

$computer));

end

rule "requiredNetworkBandwidth"

when

$computer : CloudComputer($networkBandwidth : networkBandwidth)

$requiredNetworkBandwidthTotal : Number(intValue > $networkBandwidth) from accumulate(

CloudProcess (

computer == $computer,

$requiredNetworkBandwidth : requiredNetworkBandwidth)

sum($requiredNetworkBandwidth)

)

then

insertLogical(new IntConstraintOccurrence("requiredNetworkBandwidth", ConstraintType.NEGATIVE_HARD,

$requiredNetworkBandwidthTotal.intValue() - $networkBandwidth,

$computer));

end

rule "hardConstraintBroken"

salience -1

when

$hardTotal : Number() from accumulate(

IntConstraintOccurrence(constraintType == ConstraintType.NEGATIVE_HARD, $weight : weight)

sum($weight)

)

then

scoreHolder.setHardConstraintsBroken($hardTotal.intValue());

end

// Soft constraint

rule "computerCost"

when

$computer : CloudComputer($cost : cost)

exists CloudProcess(computer == $computer)

then

insertLogical(new IntConstraintOccurrence("computerCost", ConstraintType.NEGATIVE_SOFT,

$cost,

$computer));

end

rule "softConstraintBroken"

salience -1

when

$softTotal : Number() from accumulate(

IntConstraintOccurrence(ConstraintType == ConstraintType.NEGATIVE_SOFT, $weight : weight)

sum($weight)

)

then

scoreHolder.setHardConstraintsBroken($softTotal.intValue());

end
2013/1/28 Geoffrey De Smet <ge0ffrey.spam@gmail.com>
com.swa.planner.domain.rule.Rule_requiredCpuPowerTotal_0a10acbeca924206a3becab080617987.defaultConsequence(Rule_requiredCpuPowerTotal_0a10acbeca924206a3becab080617987.java:14)
What's in the then side of Rule_requiredCpuPowerTotal ?

Op 28-01-13 16:00, André Fróes schreef:
Even adding that, the error still

--------------

12:57:41.050 [main] INFO o.d.p.core.solver.DefaultSolver - Solving started: time spend (152), score (null), new best score (null), random seed (0).

Exception in thread "main" Exception executing consequence for rule "requiredCpuPowerTotal" in com.swa.planner.domain.rule: java.lang.NullPointerException

at org.drools.runtime.rule.impl.DefaultConsequenceExceptionHandler.handleException(DefaultConsequenceExceptionHandler.java:39)

at org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:1297)

at org.drools.common.DefaultAgenda.fireNextItem(DefaultAgenda.java:1221)

at org.drools.common.DefaultAgenda.fireAllRules(DefaultAgenda.java:1456)

at org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:710)

at org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:674)

at org.drools.planner.core.score.director.drools.DroolsScoreDirector.calculateScore(DroolsScoreDirector.java:177)

at org.drools.planner.core.solver.scope.DefaultSolverScope.calculateScore(DefaultSolverScope.java:92)

at org.drools.planner.core.phase.AbstractSolverPhaseScope.calculateScore(AbstractSolverPhaseScope.java:120)

at org.drools.planner.core.constructionheuristic.greedyFit.decider.DefaultGreedyDecider.processMove(DefaultGreedyDecider.java:136)

at org.drools.planner.core.constructionheuristic.greedyFit.decider.DefaultGreedyDecider.doMove(DefaultGreedyDecider.java:110)

at org.drools.planner.core.constructionheuristic.greedyFit.decider.DefaultGreedyDecider.decideNextStep(DefaultGreedyDecider.java:82)

at org.drools.planner.core.constructionheuristic.greedyFit.DefaultGreedyFitSolverPhase.solve(DefaultGreedyFitSolverPhase.java:65)

at org.drools.planner.core.solver.DefaultSolver.runSolverPhases(DefaultSolver.java:190)

at org.drools.planner.core.solver.DefaultSolver.solve(DefaultSolver.java:155)

at com.swa.planner.domain.CloudTest.main(CloudTest.java:67)

Caused by: java.lang.NullPointerException

at java.lang.String.<init>(Unknown Source)

at org.mvel2.util.ErrorUtil.rewriteIfNeeded(ErrorUtil.java:12)

at org.mvel2.compiler.ExpressionCompiler._compile(ExpressionCompiler.java:302)

at org.mvel2.compiler.ExpressionCompiler.compile(ExpressionCompiler.java:62)

at org.mvel2.MVEL.compileExpression(MVEL.java:810)

at org.drools.base.mvel.MVELCompilationUnit.compile(MVELCompilationUnit.java:435)

at org.drools.base.mvel.MVELCompilationUnit.getCompiledExpression(MVELCompilationUnit.java:238)

at org.drools.rule.constraint.MvelConstraint.createMvelConditionEvaluator(MvelConstraint.java:206)

at org.drools.rule.constraint.MvelConstraint.evaluate(MvelConstraint.java:190)

at org.drools.rule.constraint.MvelConstraint.isAllowed(MvelConstraint.java:157)

at org.drools.reteoo.AlphaNode.assertObject(AlphaNode.java:137)

at org.drools.reteoo.CompositeObjectSinkAdapter.doPropagateAssertObject(CompositeObjectSinkAdapter.java:497)

at org.drools.reteoo.CompositeObjectSinkAdapter.propagateAssertObject(CompositeObjectSinkAdapter.java:382)

at org.drools.reteoo.ObjectTypeNode.assertObject(ObjectTypeNode.java:235)

at org.drools.reteoo.EntryPointNode.assertObject(EntryPointNode.java:240)

at org.drools.common.NamedEntryPoint.insert(NamedEntryPoint.java:350)

at org.drools.common.SimpleBeliefSystem.insert(SimpleBeliefSystem.java:38)

at org.drools.common.TruthMaintenanceSystem.addLogicalDependency(TruthMaintenanceSystem.java:204)

at org.drools.common.TruthMaintenanceSystem.addLogicalDependency(TruthMaintenanceSystem.java:176)

at org.drools.common.NamedEntryPoint.insert(NamedEntryPoint.java:231)

at org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:903)

at org.drools.base.DefaultKnowledgeHelper.insertLogical(DefaultKnowledgeHelper.java:245)

at org.drools.base.DefaultKnowledgeHelper.insertLogical(DefaultKnowledgeHelper.java:210)

at org.drools.base.DefaultKnowledgeHelper.insertLogical(DefaultKnowledgeHelper.java:205)

at com.swa.planner.domain.rule.Rule_requiredCpuPowerTotal_0a10acbeca924206a3becab080617987.defaultConsequence(Rule_requiredCpuPowerTotal_0a10acbeca924206a3becab080617987.java:14)

at com.swa.planner.domain.rule.Rule_requiredCpuPowerTotal_0a10acbeca924206a3becab080617987DefaultConsequenceInvokerGenerated.evaluate(Unknown Source)

at com.swa.planner.domain.rule.Rule_requiredCpuPowerTotal_0a10acbeca924206a3becab080617987DefaultConsequenceInvoker.evaluate(Unknown Source)

at org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:1287)

... 14 more

--------------

I added to cloudprocess computer variable:

--------------

package com.swa.planner.domain;

import org.drools.planner.api.domain.entity.PlanningEntity;

import org.drools.planner.api.domain.variable.PlanningVariable;

import org.drools.planner.api.domain.variable.ValueRange;

import org.drools.planner.api.domain.variable.ValueRangeType;

import org.drools.planner.examples.common.domain.AbstractPersistable;

@PlanningEntity(difficultyComparatorClass = CloudProcessDifficultyComparator.class)

public class CloudProcess extends AbstractPersistable{

private int requiredCpuPower;

private int requiredMemory;

private int requiredNetworkBandwidth;

private CloudComputer computer;

public CloudProcess(long id, int requiredCpuPower, int requiredMemory,

int requiredNetworkBandwidth) {

super();

setId(id);

this.requiredCpuPower = requiredCpuPower;

this.requiredMemory = requiredMemory;

this.requiredNetworkBandwidth = requiredNetworkBandwidth;

}

public CloudProcess() { }

public int getRequiredCpuPower() {

return requiredCpuPower;

}

public void setRequiredCpuPower(int requiredCpuPower) {

this.requiredCpuPower = requiredCpuPower;

}

public int getRequiredMemory() {

return requiredMemory;

}

public void setRequiredMemory(int requiredMemory) {

this.requiredMemory = requiredMemory;

}

public int getRequiredNetworkBandwidth() {

return requiredNetworkBandwidth;

}

public void setRequiredNetworkBandwidth(int requiredNetworkBandwidth) {

this.requiredNetworkBandwidth = requiredNetworkBandwidth;

}

public String getLabel() {

return "Process " + id;

}

@PlanningVariable(strengthComparatorClass = CloudComputerStrengthComparator.class)

@ValueRange(type = ValueRangeType.FROM_SOLUTION_PROPERTY, solutionProperty = "computerList")

public CloudComputer getComputer() {

if (computer == null) { return null; }

return computer;

}

public void setComputer(CloudComputer computer) {

this.computer = computer;

}

public CloudProcess clone(){

CloudProcess clone = new CloudProcess();

clone.id = id;

clone.requiredCpuPower = requiredCpuPower;

clone.requiredMemory = requiredMemory;

clone.requiredNetworkBandwidth = requiredNetworkBandwidth;

clone.computer = computer;

return clone;

}

public int getRequiredMultiplicand() {

return requiredCpuPower * requiredMemory * requiredNetworkBandwidth;

}

}

--------------

this is what i'm doing to run the example:

-------------

package com.swa.planner.domain;

import java.io.ByteArrayInputStream;

import java.util.ArrayList;

import java.util.List;

import org.drools.planner.config.SolverFactory;

import org.drools.planner.config.XmlSolverFactory;

import org.drools.planner.core.Solver;

public class CloudTest {

public static void main(String[] args) {

String t = "<?xml version=\"1.0\" encoding=\"UTF-8\"?>"

+ "<solver>"

+ " <solutionClass>com.swa.planner.domain.CloudBalance</solutionClass>"

+ " <planningEntityClass>com.swa.planner.domain.CloudProcess</planningEntityClass>"

+ " <scoreDirectorFactory>"

+ " <scoreDefinitionType>HARD_AND_SOFT</scoreDefinitionType>"

+ " <scoreDrl>/com/swa/planner/domain/rule/cloudBalancingScoreRules.drl</scoreDrl>"

+ " </scoreDirectorFactory>"

+ " <termination>"

+ " <maximumSecondsSpend>120</maximumSecondsSpend>"

+ " </termination>"

+ " <constructionHeuristic>"

+ " <constructionHeuristicType>FIRST_FIT_DECREASING</constructionHeuristicType>"

+ " <constructionHeuristicPickEarlyType>FIRST_LAST_STEP_SCORE_EQUAL_OR_IMPROVING</constructionHeuristicPickEarlyType>"

+ " </constructionHeuristic>"

+ " <localSearch>"

+ " <acceptor>"

+ " <planningEntityTabuSize>7</planningEntityTabuSize>"

+ " </acceptor>"

+ " <forager>"

+ " <minimalAcceptedSelection>1000</minimalAcceptedSelection>"

+ " </forager>"

+ " </localSearch>"

+ "</solver>";

byte b[] = t.getBytes();

ByteArrayInputStream bt = new ByteArrayInputStream(b);

SolverFactory solverFactory = new XmlSolverFactory().configure(bt);

Solver solver = solverFactory.buildSolver();

List<CloudComputer> computerList = new ArrayList<CloudComputer>();

computerList.add(new CloudComputer(1L, "Computador 1", 3, 2, 2, 110));

computerList.add(new CloudComputer(2L, "Computador 2", 12, 8, 3, 400));

computerList.add(new CloudComputer(3L, "Computador 3", 6, 6, 4, 300));

computerList.add(new CloudComputer(4L, "Computador 4", 18, 12, 8, 1000));

computerList.add(new CloudComputer(5L, "Computador 5", 8, 4, 6, 800));

computerList.add(new CloudComputer(6L, "Computador 6", 9, 7, 9, 1000));

List<CloudProcess> processList = new ArrayList<CloudProcess>();

processList.add(new CloudProcess(11L, 2, 2, 2));

processList.add(new CloudProcess(12L, 4, 4, 2));

processList.add(new CloudProcess(13L, 1, 1, 3));

processList.add(new CloudProcess(14L, 7, 3, 5));

processList.add(new CloudProcess(15L, 5, 8, 3));

processList.add(new CloudProcess(16L, 9, 2, 2));

processList.add(new CloudProcess(17L, 6, 5, 6));

CloudBalance cloudBalance = new CloudBalance();

cloudBalance.setId(0L);

cloudBalance.setComputerList(computerList);

cloudBalance.setProcessList(processList);

// Solve the problem

solver.setPlanningProblem(cloudBalance);

solver.solve();

CloudBalance solvedCloudBalance = (CloudBalance) solver.getBestSolution();

// Display the result

System.out.println("\nSolved cloudBalance with 5 computers and 6 processes:\n"

+ toDisplayString(solvedCloudBalance));

}

public static String toDisplayString(CloudBalance cloudBalance) {

StringBuilder displayString = new StringBuilder();

for (CloudProcess process : cloudBalance.getProcessList()) {

CloudComputer computer = process.getComputer();

displayString.append(" ").append(process.getLabel())

.append(" -> ")

.append(computer == null ? null : computer.getLabel())

.append("\n");

}

return displayString.toString();

}

}

-------------
2013/1/28 Geoffrey De Smet <ge0ffrey.spam@gmail.com>
The value of a variable of an entity starts out as null during construction heuristics, even if it's not nullable.

The usual trick is to add null safe getters:

public class BedDesignation {

   // bed is planning variable
...
public Departement getDepartment() {
     if (bed == null) { return null;}
     return bed.getRoom().getDepartement()
}
}

Op 28-01-13 15:13, André Fróes schreef:
I've implemented it to see how it would work, now I got another error:

---------------

12:10:41.357 [main] INFO o.d.p.core.solver.DefaultSolver - Solving started: time spend (302), score (null), new best score (null), random seed (0).

Exception in thread "main" Exception executing consequence for rule "requiredCpuPowerTotal" in com.swa.planner.domain.rule: java.lang.NullPointerException

at org.drools.runtime.rule.impl.DefaultConsequenceExceptionHandler.handleException(DefaultConsequenceExceptionHandler.java:39)

at org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:1297)

at org.drools.common.DefaultAgenda.fireNextItem(DefaultAgenda.java:1221)

at org.drools.common.DefaultAgenda.fireAllRules(DefaultAgenda.java:1456)

at org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:710)

at org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:674)

at org.drools.planner.core.score.director.drools.DroolsScoreDirector.calculateScore(DroolsScoreDirector.java:177)

at org.drools.planner.core.solver.scope.DefaultSolverScope.calculateScore(DefaultSolverScope.java:92)

at org.drools.planner.core.phase.AbstractSolverPhaseScope.calculateScore(AbstractSolverPhaseScope.java:120)

at org.drools.planner.core.constructionheuristic.greedyFit.decider.DefaultGreedyDecider.processMove(DefaultGreedyDecider.java:136)

at org.drools.planner.core.constructionheuristic.greedyFit.decider.DefaultGreedyDecider.doMove(DefaultGreedyDecider.java:110)

at org.drools.planner.core.constructionheuristic.greedyFit.decider.DefaultGreedyDecider.decideNextStep(DefaultGreedyDecider.java:82)

at org.drools.planner.core.constructionheuristic.greedyFit.DefaultGreedyFitSolverPhase.solve(DefaultGreedyFitSolverPhase.java:65)

at org.drools.planner.core.solver.DefaultSolver.runSolverPhases(DefaultSolver.java:190)

at org.drools.planner.core.solver.DefaultSolver.solve(DefaultSolver.java:155)

at com.swa.planner.domain.CloudTest.main(CloudTest.java:65)

Caused by: java.lang.NullPointerException

at java.lang.String.<init>(Unknown Source)

at org.mvel2.util.ErrorUtil.rewriteIfNeeded(ErrorUtil.java:12)

at org.mvel2.compiler.ExpressionCompiler._compile(ExpressionCompiler.java:302)

at org.mvel2.compiler.ExpressionCompiler.compile(ExpressionCompiler.java:62)

at org.mvel2.MVEL.compileExpression(MVEL.java:810)

at org.drools.base.mvel.MVELCompilationUnit.compile(MVELCompilationUnit.java:435)

at org.drools.base.mvel.MVELCompilationUnit.getCompiledExpression(MVELCompilationUnit.java:238)

at org.drools.rule.constraint.MvelConstraint.createMvelConditionEvaluator(MvelConstraint.java:206)

at org.drools.rule.constraint.MvelConstraint.evaluate(MvelConstraint.java:190)

at org.drools.rule.constraint.MvelConstraint.isAllowed(MvelConstraint.java:157)

at org.drools.reteoo.AlphaNode.assertObject(AlphaNode.java:137)

at org.drools.reteoo.CompositeObjectSinkAdapter.doPropagateAssertObject(CompositeObjectSinkAdapter.java:497)

at org.drools.reteoo.CompositeObjectSinkAdapter.propagateAssertObject(CompositeObjectSinkAdapter.java:382)

at org.drools.reteoo.ObjectTypeNode.assertObject(ObjectTypeNode.java:235)

at org.drools.reteoo.EntryPointNode.assertObject(EntryPointNode.java:240)

at org.drools.common.NamedEntryPoint.insert(NamedEntryPoint.java:350)

at org.drools.common.SimpleBeliefSystem.insert(SimpleBeliefSystem.java:38)

at org.drools.common.TruthMaintenanceSystem.addLogicalDependency(TruthMaintenanceSystem.java:204)

at org.drools.common.TruthMaintenanceSystem.addLogicalDependency(TruthMaintenanceSystem.java:176)

at org.drools.common.NamedEntryPoint.insert(NamedEntryPoint.java:231)

at org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:903)

at org.drools.base.DefaultKnowledgeHelper.insertLogical(DefaultKnowledgeHelper.java:245)

at org.drools.base.DefaultKnowledgeHelper.insertLogical(DefaultKnowledgeHelper.java:210)

at org.drools.base.DefaultKnowledgeHelper.insertLogical(DefaultKnowledgeHelper.java:205)

at com.swa.planner.domain.rule.Rule_requiredCpuPowerTotal_d2d9e4332c804bacac7861ac867eb4bd.defaultConsequence(Rule_requiredCpuPowerTotal_d2d9e4332c804bacac7861ac867eb4bd.java:14)

at com.swa.planner.domain.rule.Rule_requiredCpuPowerTotal_d2d9e4332c804bacac7861ac867eb4bdDefaultConsequenceInvokerGenerated.evaluate(Unknown Source)

at com.swa.planner.domain.rule.Rule_requiredCpuPowerTotal_d2d9e4332c804bacac7861ac867eb4bdDefaultConsequenceInvoker.evaluate(Unknown Source)

at org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:1287)

... 14 more

-----------------

this one i have no clue

2013/1/28 André Fróes <arfmoraes@gmail.com>

Hello there, i'm getting this error:

-------------------

11:26:50.394 [main] INFO o.d.p.core.solver.DefaultSolver - Solving started: time spend (187), score (null), new best score (null), random seed (0).

Exception in thread "main" java.lang.IllegalStateException: The selectionOrder (DECREASING_DIFFICULTY) can not be used on a PlanningEntity (com.swa.planner.domain.CloudProcess) that has no support for difficulty sorting. Check the @PlanningEntity annotation.

at org.drools.planner.core.heuristic.selector.entity.PlanningEntitySelector.validate(PlanningEntitySelector.java:53)

at org.drools.planner.core.heuristic.selector.entity.PlanningEntitySelector.phaseStarted(PlanningEntitySelector.java:45)

at org.drools.planner.core.constructionheuristic.greedyFit.selector.GreedyPlanningEntitySelector.phaseStarted(GreedyPlanningEntitySelector.java:41)

at org.drools.planner.core.constructionheuristic.greedyFit.DefaultGreedyFitSolverPhase.phaseStarted(DefaultGreedyFitSolverPhase.java:111)

at org.drools.planner.core.constructionheuristic.greedyFit.DefaultGreedyFitSolverPhase.solve(DefaultGreedyFitSolverPhase.java:57)

at org.drools.planner.core.solver.DefaultSolver.runSolverPhases(DefaultSolver.java:190)

at org.drools.planner.core.solver.DefaultSolver.solve(DefaultSolver.java:155)

at com.swa.planner.domain.CloudTest.main(CloudTest.java:51)

-------------------------

I know why it is happening though (at least i think so), but will I have to implement the comparator to every planner I do or is there any other way to make it work?

I'm reproducing the example from the guide, when it passes the drools rules it gives that message. I didn't implement CloudComputerStrengthComparator neither CloudProcessDifficultyComparator, will I have to implement those so this example works?
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