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Drools Planner optimizes automated planning by combining metaheuristic search algorithms with rule
engine powered score calculation. This is the drools-planner-examples module which contains examples on how to use
Drools Planner.
/*
* Copyright 2011 JBoss Inc
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.drools.planner.examples.tsp.solver;
dialect "java"
import org.drools.planner.core.score.calculator.SimpleScoreCalculator;
import org.drools.planner.core.score.constraint.IntConstraintOccurrence;
import org.drools.planner.core.score.constraint.ConstraintType;
import org.drools.planner.examples.tsp.domain.City;
import org.drools.planner.examples.tsp.domain.CityAssignment;
import org.drools.planner.examples.tsp.domain.TravelingSalesmanTour;
global SimpleScoreCalculator scoreCalculator;
// ############################################################################
// Soft constraints
// ############################################################################
rule "distance"
when
$leftCityAssignment : CityAssignment($distanceToNextCityAssignment : distanceToNextCityAssignment)
then
insertLogical(new IntConstraintOccurrence("distance", ConstraintType.NEGATIVE_SOFT,
$distanceToNextCityAssignment,
$leftCityAssignment));
end
// ############################################################################
// Calculate score
// ############################################################################
rule "softConstraintsBroken"
when
$softTotal : Number() from accumulate(
IntConstraintOccurrence(constraintType == ConstraintType.NEGATIVE_SOFT, $weight : weight),
sum($weight) // Vote for http://jira.jboss.com/jira/browse/JBRULES-1075
)
then
scoreCalculator.setScore(- $softTotal.intValue());
end