A toy program to demonstrate the C/R abilities using CRaC JDK

PrimeTime.java

import java.util.*;
import java.lang.*;
import java.text.*;
import jdk.crac.*;

public class PrimeTime implements jdk.crac.Resource {
    /* - get the current time in milliseconds - T1
       - print the time as a human readable date
       - reverse the digits in T1 to create a T2
       - print the time T2 as a human readable date
    */

    private int counter = 0;
        
    public static void main(String [] args) throws Exception {
       if ("warmup".equals(args[0])) { 
            System.out.println("New PrimeTime");
            PrimeTime pt = new PrimeTime();
            Core.getGlobalContext().register(pt);
            pt.run();
        }
    }

    public void run() {
        while (true) {
            long start = System.nanoTime();
            runBenchmark();
            long end = System.nanoTime();
            if ( (counter < 1000 && counter % 100 == 0)
                || (counter < 5000 && counter % 500 == 0)
                || (counter < 100000 && counter % 5000 == 0)
                || (counter % 100000 == 0)) {
                System.out.println("Time taken for iteration #" + counter + ": " + (end-start));
                System.out.println("============================================" + Thread.currentThread());
            }
            counter = counter + 1;
        }
    }

    private void runBenchmark() {
        long millis = System.currentTimeMillis();

        DateFormat formatter = new SimpleDateFormat("dd/MM/yyyy");
        Calendar calendar = Calendar.getInstance();
        calendar.setTimeInMillis(millis);
        System.err.println("Date: " + formatter.format(calendar.getTime()));

        long reverseMillis = Long.parseLong(new StringBuilder(String.valueOf(millis)).reverse().toString());
        calendar.setTimeInMillis(reverseMillis);
        System.err.println("Date: " + formatter.format(calendar.getTime()));
    }

    @Override
    public void afterRestore(Context<? extends Resource> context) {
        counter = 0;
    }

    @Override
    public void beforeCheckpoint(Context<? extends Resource> context) {
    }
}