TestTimeSource.java

package org.deeplearning4j.spark.time;

import org.junit.Test;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;

/**
 * Created by Alex on 26/06/2016.
 */
public class TestTimeSource {

    @Test
    public void testTimeSourceNTP() throws Exception {
        TimeSource timeSource = TimeSourceProvider.getInstance();
        assertTrue(timeSource instanceof NTPTimeSource);

        for (int i = 0; i < 10; i++) {
            long systemTime = System.currentTimeMillis();
            long ntpTime = timeSource.currentTimeMillis();
            long offset = ntpTime - systemTime;
            System.out.println("System: " + systemTime + "\tNTPTimeSource: " + ntpTime + "\tOffset: " + offset);
            Thread.sleep(500);
        }
    }

    @Test
    public void testTimeSourceSystem() throws Exception {
        TimeSource timeSource = TimeSourceProvider.getInstance("org.deeplearning4j.spark.time.SystemClockTimeSource");
        assertTrue(timeSource instanceof SystemClockTimeSource);

        for (int i = 0; i < 10; i++) {
            long systemTime = System.currentTimeMillis();
            long ntpTime = timeSource.currentTimeMillis();
            long offset = ntpTime - systemTime;
            System.out.println("System: " + systemTime + "\tSystemClockTimeSource: " + ntpTime + "\tOffset: " + offset);
            assertEquals(systemTime, ntpTime, 2); //Should be exact, but we might randomly tick over between one ms and the next
            Thread.sleep(500);
        }
    }

}