/* Richard A. DeVenezia
 * SUGI 29 - "Greetings from the Edge"
 * www.devenezia.com/papers
 */

import java.rmi.registry.LocateRegistry;
import java.rmi.*;

public class HashServer
{
  protected static final String RMI_NAME = "PERSISTENT-HASH-MANAGER";

  private String exceptionMessage;

  // This method is run when class is run as stand-alone java application,
  // from whence comes run-time persistence

  public static void main(String args[]){

    // sets security according to file named in environment variable java.security.policy
    System.setSecurityManager(new RMISecurityManager());

    try{
      // 1099 is the default port for RMI
      // This method removes the need to also run "rmiregistry" as stand-alone process prior
      // to starting this class as a stand-alone process
      LocateRegistry.createRegistry(1099);

      // Instantiate the implementation of the interface that will persist as long as this server runs
      Integer n = Integer.getInteger("number.of.hashes", 5);
      HashManager manager = new HashManager (n.intValue());

      // Give this process the name that localhost clients use with Naming.lookup()
      Naming.rebind (RMI_NAME, manager);

      System.out.println(manager.getClass().getName() + " ready to manage " + n + " hashes.");
    }
    catch(Exception e)
    {
      System.out.println("Error: " + e);
    }
  }

  //---------------------------------------------------------------------------
  public static HashInterface getReferenceToPersistentManager ()
  {
    int numberOfTimesToWait = 4;
    long durationToWaitInMillis = 250;

    Remote remote = null;

    try {
      for (int i = 0; (i<numberOfTimesToWait) && (remote == null); i++) {
        try {
          remote = Naming.lookup(RMI_NAME);
        }
        catch (java.rmi.NotBoundException e)
        {
          // if not bound, wait a little, in case server was just started and things haven't settled in yet
          System.out.println ("waiting ");
          Thread.currentThread().sleep (durationToWaitInMillis);
        }
      }
    }
    catch (Exception e) {
      System.out.println("Error " + e);
    }

    return (HashInterface) remote;
  }

}