package org.dannil.mpt;

import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

public class Test {

    public Test() {

    }

    public void doOperation() {
        int topBoundary = 10000000;

        double beforeMillis;
        double afterMillis;

        System.out.println("Running in single-threaded mode");

        beforeMillis = System.currentTimeMillis();

        for (int i = 0; i < topBoundary; i++) {
            Prime.isPrime(i);
        }

        afterMillis = System.currentTimeMillis();

        System.out.println("Time elapsed: " + (afterMillis - beforeMillis) / 1000 + " sec.");

        System.gc();

        System.out.println("Running in multi-threaded mode");

        ExecutorService executor = Executors.newFixedThreadPool(4);

        beforeMillis = System.currentTimeMillis();

        for (int i = 0; i < topBoundary; i++) {
            Runnable worker = new PrimeWorker(i);
            executor.execute(worker);
        }
        executor.shutdown();

        afterMillis = System.currentTimeMillis();

        System.out.println("Time elapsed: " + (afterMillis - beforeMillis) / 1000 + " sec.");
    }

    class PrimeWorker implements Runnable {

        private int n;

        public PrimeWorker(int n) {
            this.n = n;
        }

        @Override
        public void run() {
            boolean isPrime = Prime.isPrime(this.n);
            if (isPrime) {
                // System.out.println(this.n + " is a prime number!");
            }
        }

    }

    public static void main(String[] args) {
        Test test = new Test();
        test.doOperation();
    }

}