package org.gridgain.examples.primenumbers.api;

import java.util.*;
import org.gridgain.grid.*;

public final class GridPrimeExample {
    /**
     * Enforces singleton.
     */
    private GridPrimeExample() {
        // No-op.
    }
    
    /**
     * Starts up grid and checks all provided values for prime.
     *
     * @param args Command line arguments, none required but if provided
     *      first one should point to the Spring XML configuration file. See
     *      <tt>"examples/config/"</tt> for configuration file examples.
     * @throws GridException If example execution failed.
     */
    public static void main(String[] args) throws GridException {
        Grid grid = null;

        // Start grid.
        if (args.length == 0) {
            grid = GridFactory.start();
        }
        else {
            grid = GridFactory.start(args[0]);
        }

        // Values we want to check for prime.
        long[] checkVals = { 32452841, 32452843, 32452847, 32452849, 236887699, 217645199 };

        System.out.println(">>>");
        System.out.println(">>> Starting to check the following numbers for primes: " + Arrays.toString(checkVals));

        try {
            long start = System.currentTimeMillis();

            for (long checkVal : checkVals) {
                // Execute grid task to check a specific value for prime.
                // Find any divisor. If the divisor is null,
                // then the number is prime.
                Long divisor = grid.execute(GridPrimeTask.class, checkVal).get();

                if (divisor == null) {
                    System.out.println(">>> Value '" + checkVal + "' is a prime number");
                }
                else {
                    System.out.println(">>> Value '" + checkVal + "' is divisible by '" + divisor + '\'');
                }
            }

            long totalTime = System.currentTimeMillis() - start;

            System.out.println(">>> Total time to calculate all primes (milliseconds): " + totalTime);
            System.out.println(">>>");
        }
        finally {
            // Stop grid.
            GridFactory.stop(grid.getName(), true);
        }
    }
}