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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.
/*
* 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.event;
import java.util.EventListener;
import org.drools.planner.core.Solver;
import org.drools.planner.core.score.Score;
import org.drools.planner.core.solution.Solution;
import org.drools.planner.core.solver.ProblemFactChange;
public interface SolverEventListener extends EventListener {
/**
* Called once every time when a better {@link Solution} is found.
* Early in the solving process it's usually called more frequently than later on.
*
* Called from the solver thread.
* Should return fast, because it steals time from the {@link Solver}.
*
* If {@link Solver#addProblemFactChange(ProblemFactChange)} has been called once or more,
* all {@link ProblemFactChange}s will be processed and this method is called once.
* In that case, the former best {@link Solution} is considered stale,
* so it doesn't matter whether the new {@link Score} is better than that or not.
* @param event never null
*/
void bestSolutionChanged(BestSolutionChangedEvent event);
}