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Java example source code file (LocalWorkRetriever.java)

This example Java source code file (LocalWorkRetriever.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

collection, concurrenthashmap, entrylistener, file, imap, job, localworkretriever, map, override, string, threading, threads, util, work_retriever

The LocalWorkRetriever.java Java example source code

/*
 *
 *  * Copyright 2015 Skymind,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.deeplearning4j.scaleout.statetracker.workretriever;


import com.hazelcast.core.*;
import org.deeplearning4j.scaleout.job.Job;
import org.deeplearning4j.scaleout.api.statetracker.WorkRetriever;
import org.deeplearning4j.util.SerializationUtils;

import java.io.File;
import java.util.Collection;
import java.util.HashSet;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;

/**
 * Local worker retriever
 * @author Adam Gibson
 */
public class LocalWorkRetriever implements WorkRetriever {

    private Map<String,String> workerData = new ConcurrentHashMap<>();
    private IMap<String,Job> distributedData;
    public final static String WORK_RETRIEVER = "workretriever";
    public LocalWorkRetriever() {}

    public LocalWorkRetriever(HazelcastInstance instance) {
        distributedData = instance.getMap(WORK_RETRIEVER);
        distributedData.addEntryListener(new EntryListener<String, Job>() {
            @Override
            public void entryAdded(EntryEvent<String, Job> event) {
                String worker = event.getKey();
                File f = new File(worker + "-work");
                SerializationUtils.saveObject(event.getValue(), f);
                workerData.put(worker,f.getAbsolutePath());
                //only needed for the save event
                distributedData.remove(worker);

            }

            @Override
            public void entryRemoved(EntryEvent<String, Job> event) {

            }

            @Override
            public void entryUpdated(EntryEvent<String, Job> event) {

            }

            @Override
            public void entryEvicted(EntryEvent<String, Job> event) {

            }

            @Override
            public void mapEvicted(MapEvent mapEvent) {

            }

            @Override
            public void mapCleared(MapEvent mapEvent) {

            }
        },true);
    }


    /**
     * Clears the worker
     *
     * @param worker the worker to clear
     */
    @Override
    public void clear(String worker) {
        workerData.remove(worker);
    }

    /**
     * The collection of workers that are saved
     *
     * @return the collection of workers that have data saved
     */
    @Override
    public Collection<String> workers() {
        return new HashSet<>(workerData.keySet());
    }

    /**
     * Loads the data applyTransformToDestination
     *
     * @param worker the worker to load for
     * @return the data for the given worker or null
     */
    @Override
    public Job load(String worker) {
        File f = workerData.get(worker) != null ? new File(workerData.get(worker)) : null;
        if(f == null || !f.exists())
            return null;
        Job d = SerializationUtils.readObject(f);
        workerData.remove(f);
        f.delete();
        return d;
    }

    /**
     * Saves the data  for a given worker
     *
     * @param worker the worker to save data for
     * @param data   the data to save
     */
    @Override
    public void save(String worker, Job data){
        if(distributedData != null)
            distributedData.put(worker,data);

        else {
            File f = new File(worker + "-work");
            SerializationUtils.saveObject(data,f);
            workerData.put(worker,f.getAbsolutePath());
        }



    }
}

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