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Apache Ignite® is a Distributed Database For High-Performance Computing With In-Memory Speed.
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/*
 * 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.HashMap;
import java.util.List;
import java.util.Map;

import org.apache.ignite.Ignite;
import org.apache.ignite.IgniteException;
import org.apache.ignite.cache.affinity.Affinity;
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.resources.IgniteInstanceResource;

import org.apache.ignite.ml.genetic.parameter.GAConfiguration;
import org.apache.ignite.ml.genetic.parameter.GAGridConstants;

/**
 * Responsible for fitness operation
 */
public class FitnessTask extends ComputeTaskAdapter, Boolean> {
    /** Ignite instance */
    @IgniteInstanceResource
    private Ignite ignite = null;

    /** GAConfiguration */
    private GAConfiguration config = null;

    /**
     * @param config GAConfiguration
     */
    public FitnessTask(GAConfiguration config) {
        this.config = config;
    }

    /**
     * @param nodes List of ClusterNode
     * @param chromosomeKeys List of chromosome keys
     * @return Map of jobs to nodes
     */
    public Map map(List nodes, List chromosomeKeys) throws IgniteException {

        Map map = new HashMap<>();

        Affinity affinity = ignite.affinity(GAGridConstants.POPULATION_CACHE);

        for (Long key : chromosomeKeys) {

            FitnessJob ajob = new FitnessJob(key, this.config.getFitnessFunction());

            ClusterNode primary = affinity.mapKeyToNode(key);

            map.put(ajob, primary);
        }
        return map;
    }

    /**
     * @param list List of ComputeJobResult
     * @return Boolean value
     */
    public Boolean reduce(List list) throws IgniteException {

        return Boolean.TRUE;
    }

    /**
     * @param res ComputeJobResult
     * @param rcvd List of ComputeJobResult
     * @return ComputeJobResultPolicy
     */
    public ComputeJobResultPolicy result(ComputeJobResult res, List rcvd) {
        IgniteException err = res.getException();

        if (err != null)
            return ComputeJobResultPolicy.FAILOVER;

        // If there is no exception, wait for all job results.
        return ComputeJobResultPolicy.WAIT;

    }
}