/* It implements a simple server class                        */
/* It implements a simple client class                        */
/* It implements main program                                 */
/* The executable program has to be started java Example1 n   */
/*   where n is a number of rendez-vous repetitions  */

class Client extends Thread {  //thread

  private Server serv;
  private int n;

  Client (Server par_serv, int par_n) {
    serv = par_serv; n = par_n;
  }

  public void run () {
    for (int i = 0; i< n; i++) {
      try {
        sleep((100*i)%17);
      } catch (InterruptedException e) {}
      System.out.println("client calls r-v");
      serv.entry_1();
      System.out.println("client releases r-v");
    }
  }
}

class Server extends Thread {  //thread

  private Entry e1;

  Server () { e1 = new Entry();}

  synchronized void entry_1() {
    e1.call_entry();
    System.out.println("r-v in progress");
    e1.release_entry();
  }

  public void run () {
     int i = 0;    
     while (true) {
      try {
        sleep((100*i)%23);     // sleeping
      } catch (InterruptedException e) {}

      System.out.println("server accepts r-v");
      System.out.println("count =" + e1.get_count()); //kontrola
      e1.accept_entry();
      System.out.println("count =" + e1.get_count()); //kontrola
      System.out.println("server releases r-v");

      i++;  
    }
  }
}

public class Example1 {
  public static void main (String[] argv) {
    int n = 0;
    if (argv.length == 1) {   //checking number of arguments
      try {   //trying convert string to int
        n = Integer.valueOf(argv[0]).intValue();
      } catch (NumberFormatException e) {
        System.out.println("Invalid number format!");
      }
      if (n > 0) {
        Server serv = new Server();
        serv.setDaemon(true);
        Client cl   = new Client(serv, n);
        serv.start();
        cl.start();

        try {
          cl.join();
        } catch (InterruptedException e) {}
      }
      else {
        System.out.println("Number must be greater than 0!");
      }
    }
    else {
      System.out.println("Invalid argument count!");
    }
  }
}