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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-core module which contains metaheuristic algorithms.

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/*
 * 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.core.localsearch.decider.deciderscorecomparator;

import java.util.Comparator;

import org.drools.planner.core.localsearch.event.LocalSearchSolverPhaseLifecycleListener;
import org.drools.planner.core.score.Score;

/**
 * A DeciderScoreComparatorFactory creates a new DeciderScoreComparator each step,
 * which compares 2 scores to decide the next step.
 * That Score Comparator can consider shifting penalty, aging penalty, ...
 * in which case it differs from the natural ordering of scores.
 */
public interface DeciderScoreComparatorFactory extends LocalSearchSolverPhaseLifecycleListener {

    /**
     * @return never null
     */
    Comparator createDeciderScoreComparator();

}