[rules-users] Error selecting order decrease [planner]
André Fróes
arfmoraes at gmail.com
Mon Jan 28 10:38:43 EST 2013
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 at 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 at 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 at 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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>>
>>
>>
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>>
>>
>
>
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>
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