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Java example source code file (ModelSavingActor.java)

This example Java source code file (ModelSavingActor.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.

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Java - Java tags/keywords

actorref, defaultmodelsaver, exception, file, job, modelsavingactor, moreworkmessage, object, override, post, sending, statetracker, string, suppresswarnings

The ModelSavingActor.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.actor.core.actor;

import java.io.File;

import org.deeplearning4j.scaleout.actor.core.ClusterListener;
import org.deeplearning4j.scaleout.actor.core.DefaultModelSaver;
import org.deeplearning4j.scaleout.actor.core.ModelSaver;

import akka.actor.ActorRef;
import akka.actor.UntypedActor;
import akka.cluster.Cluster;
import akka.contrib.pattern.DistributedPubSubExtension;
import akka.contrib.pattern.DistributedPubSubMediator;
import akka.event.Logging;
import akka.event.LoggingAdapter;
import org.deeplearning4j.scaleout.job.Job;
import org.deeplearning4j.scaleout.messages.MoreWorkMessage;
import org.deeplearning4j.scaleout.api.statetracker.StateTracker;

 * Listens for a neural network to save
 * @author Adam Gibson
public class ModelSavingActor extends UntypedActor {

    public final static String SAVE = "save";
    private String pathToSave;
    private ActorRef mediator = DistributedPubSubExtension.get(getContext().system()).mediator();
    private LoggingAdapter log = Logging.getLogger(getContext().system(), this);
    private Cluster cluster = Cluster.get(context().system());
    private ModelSaver modelSaver = new DefaultModelSaver();
    private StateTracker stateTracker;

    public ModelSavingActor(String pathToSave,StateTracker stateTracker) {
        this.pathToSave = pathToSave;
        modelSaver = new DefaultModelSaver(new File(pathToSave));
        this.stateTracker = stateTracker;

    public ModelSavingActor(ModelSaver saver,StateTracker stateTracker) {
        this.modelSaver = saver;
        this.stateTracker = stateTracker;


        mediator.tell(new DistributedPubSubMediator.Subscribe(SAVE, getSelf()), getSelf());
        //subscribe to shutdown messages
        mediator.tell(new DistributedPubSubMediator.Subscribe(MasterActor.SHUTDOWN, getSelf()), getSelf());


    public void postStop() throws Exception {

        log.info("Post stop on model saver");

    public void preStart() throws Exception {
        log.info("Pre start on model saver");

    public void onReceive(final Object message) throws Exception {
        if(message instanceof MoreWorkMessage) {
            if(stateTracker.getCurrent() != null) {
                Job j = (Job) stateTracker.getCurrent();

        else if(message instanceof DistributedPubSubMediator.UnsubscribeAck || message instanceof DistributedPubSubMediator.SubscribeAck) {
            mediator.tell(new DistributedPubSubMediator.Publish(ClusterListener.TOPICS,
                    message), getSelf());
            log.info("Sending sub/unsub over");



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