001    /*
002     * Copyright 2011 Christian Kumpe http://kumpe.de/christian/java
003     *
004     * Licensed under the Apache License, Version 2.0 (the "License");
005     * you may not use this file except in compliance with the License.
006     * You may obtain a copy of the License at
007     *
008     *     http://www.apache.org/licenses/LICENSE-2.0
009     *
010     * Unless required by applicable law or agreed to in writing, software
011     * distributed under the License is distributed on an "AS IS" BASIS,
012     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013     * See the License for the specific language governing permissions and
014     * limitations under the License.
015     */
016    package de.kumpe.hadooptimizer;
017    
018    import java.io.Serializable;
019    import java.util.Collection;
020    
021    /**
022     * A {@link Halter} decides whether to stop or continue the evolution cycle.
023     * 
024     * @param <I>
025     *            the individuals' type
026     * 
027     * @author <a href="http://kumpe.de/christian/java">Christian Kumpe</a>
028     */
029    public interface Halter<I> extends Serializable {
030            /**
031             * Decides whether to stop or continue the evolution cycle.
032             * 
033             * @param evaluationResults
034             *            the {@link EvaluationResult}s of the parents for the next
035             *            generation
036             * @return <code>true</code> to stop the evolution cycle, <code>false</code>
037             *         to continue
038             */
039            boolean halt(Collection<EvaluationResult<I>> evaluationResults);
040    }