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Java example source code file (BaseWorkRouter.java)

This example Java source code file (BaseWorkRouter.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

baseworkrouter, exception, iterateandupdate, job, logger, override, replicating, runtimeexception, statetracker, unable, updating

The BaseWorkRouter.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.api.workrouter;

import org.canova.api.conf.Configuration;
import org.deeplearning4j.scaleout.api.statetracker.IterateAndUpdate;
import org.deeplearning4j.scaleout.api.statetracker.StateTracker;
import org.deeplearning4j.scaleout.job.Job;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Handles job flow
 * @author Adam Gibson
 */
public abstract class BaseWorkRouter implements WorkRouter {

    protected StateTracker stateTracker;
    protected boolean waitForWorkers = true;
    protected static final Logger log = LoggerFactory.getLogger(WorkRouter.class);

    public BaseWorkRouter() {

    }

    public BaseWorkRouter(StateTracker stateTracker) {
        this.stateTracker = stateTracker;
    }

    @Override
    public void update() {
        Job masterResults = compute();
        log.info("Updating next batch");
        try {
            stateTracker.setCurrent(masterResults);
        } catch (Exception e) {
            e.printStackTrace();
        }

        for(String s : stateTracker.workers()) {
            log.info("Replicating new work to " + s);
            stateTracker.addReplicate(s);
            stateTracker.enableWorker(s);

        }
        stateTracker.workerUpdates().clear();


    }


    public  Job compute() {


        IterateAndUpdate update =  stateTracker.updates();
        if(stateTracker.workerUpdates().isEmpty())
            return null;

        try {
            update.accumulate();

        }catch(Exception e) {
            log.debug("Unable to accumulate results",e);
            return null;
        }

        Job masterResults = null;
        try {
            masterResults = (Job) stateTracker.getCurrent();
        } catch (Exception e) {
            e.printStackTrace();
        }
        if(masterResults == null)
            masterResults = update.accumulated();


        try {
            stateTracker.setCurrent(masterResults);

        } catch (Exception e) {
            throw new RuntimeException(e);
        }


        return masterResults;
    }

    @Override
    public StateTracker stateTracker() {
        return stateTracker;
    }

    @Override
    public void setup(Configuration conf) {
        if(stateTracker == null)
            try {
                stateTracker = createStateTracker(conf);
            } catch (Exception e) {
                throw new RuntimeException(e);
            }
        waitForWorkers = conf.getBoolean(WAIT_FOR_WORKERS,true);
    }

    @Override
    public boolean isWaitForWorkers() {
        return waitForWorkers;
    }

    @Override
    public void routeJob(Job job) {
        try {
            stateTracker.addJobToCurrent(job);
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }

    public abstract StateTracker createStateTracker(Configuration conf) throws Exception;


}

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