import java.io.*;
import java.math.*;
import java.util.*;

public class PrimeHandler extends Thread {
  private PrimeStorage ps = new PrimeStorage();
  private String fileName = "prime_storage";
  private String password = "2isAnOddPrime";

  public static void main(String[] args) {
    new PrimeHandler();
  }

  public PrimeHandler() {
    //setDaemon(true);
    setPriority(Thread.MIN_PRIORITY); // be nice!
    start();
  }

  public String getPrime(String password) {
    if(password.equals(this.password))
      return "\nPrime: " + ps.prime + "\nBinary digits: " + ps.digits + "\nFound: " + ps.date;
    return "Wrong password!";
  }

  public void run() {
    load();

    while(true) {
      ps.digits++;
      ps.prime = new BigInteger(ps.digits, 0, new Random());
      ps.date = new Date();

      save();

      try { sleep(5000); } catch(InterruptedException ie) {} // be nice!
    }        
  }

  private void save() {
    try {
      ObjectOutputStream oos = new ObjectOutputStream(new FileOutputStream(fileName));
      oos.writeObject(ps);
      oos.close();
    } catch (IOException ioe) {
      System.out.println("IOException: " + ioe);
    }
  }

  private void load() {
    try {
      ObjectInputStream ois = new ObjectInputStream(new FileInputStream(fileName));
      ps = (PrimeStorage)ois.readObject();
      ois.close();
    } catch (Exception e) {
      System.out.println("Exception: " + e);
    }
  } 
}

class PrimeStorage implements Serializable {
  public int digits = 1;
  public BigInteger prime = null;
  public Date date = null;
}