| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You 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.apache.ignite.ml.genetic; |
| |
| import java.util.ArrayList; |
| import java.util.HashMap; |
| import java.util.List; |
| import java.util.Map; |
| import javax.cache.Cache.Entry; |
| import org.apache.ignite.Ignite; |
| import org.apache.ignite.IgniteCache; |
| import org.apache.ignite.IgniteException; |
| import org.apache.ignite.cache.affinity.Affinity; |
| import org.apache.ignite.cache.query.QueryCursor; |
| import org.apache.ignite.cache.query.SqlQuery; |
| import org.apache.ignite.cluster.ClusterNode; |
| import org.apache.ignite.compute.ComputeJob; |
| import org.apache.ignite.compute.ComputeJobResult; |
| import org.apache.ignite.compute.ComputeJobResultPolicy; |
| import org.apache.ignite.compute.ComputeTaskAdapter; |
| import org.apache.ignite.ml.genetic.parameter.GAGridConstants; |
| import org.apache.ignite.resources.IgniteInstanceResource; |
| import org.jetbrains.annotations.NotNull; |
| |
| /** |
| * Responsible for performing truncate selection. |
| */ |
| public class TruncateSelectionTask extends ComputeTaskAdapter<List<Long>, Boolean> { |
| /** Ignite resource. */ |
| @IgniteInstanceResource |
| private Ignite ignite; |
| |
| /** Fittest keys. */ |
| private List<Long> fittestKeys; |
| |
| /** Number of Copies. */ |
| private int numOfCopies; |
| |
| /** |
| * @param fittestKeys List of long. |
| * @param numOfCopies Number of Copies. |
| */ |
| public TruncateSelectionTask(List<Long> fittestKeys, int numOfCopies) { |
| this.fittestKeys = fittestKeys; |
| this.numOfCopies = numOfCopies; |
| } |
| |
| /** |
| * Retrieve a chromosome. |
| * |
| * @param key Primary key of chromosome. |
| * @return Chromosome. |
| */ |
| private Chromosome getChromosome(Long key) { |
| IgniteCache<Long, Chromosome> cache = ignite.cache(GAGridConstants.POPULATION_CACHE); |
| StringBuffer sbSqlClause = new StringBuffer(); |
| sbSqlClause.append("_key IN ("); |
| sbSqlClause.append(key); |
| sbSqlClause.append(")"); |
| |
| Chromosome chromosome = null; |
| |
| SqlQuery sql = new SqlQuery(Chromosome.class, sbSqlClause.toString()); |
| |
| try (QueryCursor<Entry<Long, Chromosome>> cursor = cache.query(sql)) { |
| for (Entry<Long, Chromosome> e : cursor) |
| chromosome = (e.getValue()); |
| } |
| |
| return chromosome; |
| } |
| |
| /** |
| * Return a List of lists containing keys. |
| * |
| * @return List of lists containing keys. |
| */ |
| private List<List<Long>> getEnhancedPopulation() { |
| List<List<Long>> list = new ArrayList<>(); |
| |
| for (Long key : fittestKeys) { |
| Chromosome cp = getChromosome(key); |
| for (int i = 0; i < numOfCopies; i++) { |
| long[] thegenes = cp.getGenes(); |
| List<Long> geneList = new ArrayList<>(); |
| for (int k = 0; k < cp.getGenes().length; k++) |
| geneList.add(thegenes[k]); |
| |
| list.add(geneList); |
| } |
| } |
| |
| return list; |
| } |
| |
| /** {@inheritDoc} */ |
| @NotNull @Override public Map map(List<ClusterNode> nodes, List<Long> chromosomeKeys) throws IgniteException { |
| Map<ComputeJob, ClusterNode> map = new HashMap<>(); |
| Affinity affinity = ignite.affinity(GAGridConstants.POPULATION_CACHE); |
| |
| // Retrieve enhanced population |
| List<List<Long>> enhancedPopulation = getEnhancedPopulation(); |
| |
| int k = 0; |
| for (Long key : chromosomeKeys) { |
| TruncateSelectionJob ajob = new TruncateSelectionJob(key, enhancedPopulation.get(k)); |
| ClusterNode primary = affinity.mapKeyToNode(key); |
| map.put(ajob, primary); |
| k += 1; |
| } |
| return map; |
| } |
| |
| /** {@inheritDoc} */ |
| @Override public Boolean reduce(List<ComputeJobResult> list) throws IgniteException { |
| return Boolean.TRUE; |
| } |
| |
| /** {@inheritDoc} */ |
| @Override public ComputeJobResultPolicy result(ComputeJobResult res, List<ComputeJobResult> rcvd) { |
| IgniteException err = res.getException(); |
| |
| if (err != null) |
| return ComputeJobResultPolicy.FAILOVER; |
| |
| // If there is no exception, wait for all job results. |
| return ComputeJobResultPolicy.WAIT; |
| } |
| |
| } |