partnerserverimpl.java

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/*
 * Java Network Programming, Second Edition
 * Merlin Hughes, Michael Shoffner, Derek Hamner
 * Manning Publications Company; ISBN 188477749X
 *
 * http://nitric.com/jnp/
 *
 * Copyright (c) 1997-1999 Merlin Hughes, Michael Shoffner, Derek Hamner;
 * all rights reserved; see license.txt for details.
 */

import java.rmi.*;
import java.util.*;
import java.rmi.server.*;
import java.rmi.registry.*;

public class PartnerServerImpl extends UnicastRemoteObject implements PartnerServer {
  protected Hashtable pending;

  public PartnerServerImpl () throws RemoteException {
    pending = new Hashtable ();
  }

  public synchronized boolean assignPartner (String service, Partner myself) throws RemoteException {
    if (!pending.containsKey (service)) {
      pending.put (service, myself);
      return false;
    } else {
      Partner partner = (Partner) pending.get (service);
      pending.remove (service);
      partner.partnered (service, myself);
      myself.partnered (service, partner);
      return true;
    }
  }

  public static void main (String[] args) throws RemoteException, AlreadyBoundException {
    if (args.length != 2)
      throw new IllegalArgumentException
        ("Syntax: PartnerServerImpl <port> <service>");

    int port = Integer.parseInt (args[0]);
    String service = args[1];

    PartnerServerImpl partnerServer = new PartnerServerImpl ();
    try {
      Registry registry = LocateRegistry.getRegistry (port);
      registry.bind (service, partnerServer);
    } catch (ConnectException ex) {
      Registry registry = LocateRegistry.createRegistry (port);
      registry.bind (service, partnerServer);
    }
  }
}