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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 2010 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.nqueens.solver;
dialect "java"
import org.drools.planner.core.score.buildin.simple.SimpleScoreHolder;
import org.drools.planner.core.score.constraint.UnweightedConstraintOccurrence;
import org.drools.planner.core.score.constraint.ConstraintType;
import org.drools.planner.examples.nqueens.domain.Queen;
global SimpleScoreHolder scoreHolder;
// ############################################################################
// Hard constraints
// ############################################################################
rule "multipleQueensHorizontal"
when
$q1 : Queen($id : id, $i : rowIndex)
$q2 : Queen(id > $id, rowIndex == $i)
then
insertLogical(new UnweightedConstraintOccurrence("multipleQueensHorizontal", $q1, $q2));
end
// multipleQueensVertical is build-in
rule "multipleQueensAscendingDiagonal"
when
$q1 : Queen($id : id, $i : ascendingDiagonalIndex)
$q2 : Queen(id > $id, ascendingDiagonalIndex == $i)
then
insertLogical(new UnweightedConstraintOccurrence("multipleQueensAscendingDiagonal", $q1, $q2));
end
rule "multipleQueensDescendingDiagonal"
when
$q1 : Queen($id : id, $i : descendingDiagonalIndex)
$q2 : Queen(id > $id, descendingDiagonalIndex == $i)
then
insertLogical(new UnweightedConstraintOccurrence("multipleQueensDescendingDiagonal", $q1, $q2));
end
// ############################################################################
// Calculate score
// ############################################################################
rule "hardConstraintsBroken"
when
$occurrenceCount : Number() from accumulate(
$unweightedConstraintOccurrence : UnweightedConstraintOccurrence(),
count($unweightedConstraintOccurrence)
)
then
scoreHolder.setScore(- $occurrenceCount.intValue());
end