/*
 *
 * Copyright 2002 Sun Microsystems, Inc. All Rights Reserved.
 *
 * Redistribution and use in source and binary forms, with or
 * without modification, are permitted provided that the following
 * conditions are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 *
 * - Redistribution in binary form must reproduce the above
 *   copyright notice, this list of conditions and the following
 *   disclaimer in the documentation and/or other materials
 *   provided with the distribution.
 *
 * Neither the name of Sun Microsystems, Inc. or the names of
 * contributors may be used to endorse or promote products derived
 * from this software without specific prior written permission.
 *
 * This software is provided "AS IS," without a warranty of any
 * kind. ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND
 * WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY
 * EXCLUDED. SUN AND ITS LICENSORS SHALL NOT BE LIABLE FOR ANY
 * DAMAGES OR LIABILITIES SUFFERED BY LICENSEE AS A RESULT OF OR
 * RELATING TO USE, MODIFICATION OR DISTRIBUTION OF THIS SOFTWARE OR
 * ITS DERIVATIVES. IN NO EVENT WILL SUN OR ITS LICENSORS BE LIABLE
 * FOR ANY LOST REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT,
 * SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER
 * CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF
 * THE USE OF OR INABILITY TO USE THIS SOFTWARE, EVEN IF SUN HAS
 * BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
 *
 * You acknowledge that this software is not designed, licensed or
 * intended for use in the design, construction, operation or
 * maintenance of any nuclear facility.
 *
 */


package hello;

import java.rmi.*;
import java.util.*;

public class HelloImpl implements HelloIF
{
  protected LinkedList userList1 = new LinkedList();
  protected LinkedList userList2 = new LinkedList();

  protected String userName1 = "";
  protected String userName2 = "";

  public boolean register(String userName) throws RemoteException
  {
    if("".equals(userName1))
    {
      userName1 = userName;
      return true;
    }
    else if("".equals(userName2))
    {
      userName2 = userName;
      return true;
    }
    return false;
  }

  public JAXMessage send(String userName) throws RemoteException
  {
    
    JAXMessage adminMsg = new JAXMessage();
    adminMsg.setUser("Admin");
    if(userName.equals(userName1))
    {
      try
      {
        JAXMessage msg = (JAXMessage)userList2.removeFirst();
        return msg;
      }
      catch(NoSuchElementException e)
      {
        return null;
      }
    }
    else if(userName.equals(userName2))
    {
      try
      {
        JAXMessage msg = (JAXMessage)userList1.removeFirst();
        return msg;
      }
      catch(NoSuchElementException e)
      {
        return null;
      }
    }
    adminMsg.setText("userName1="+userName1+",userName2="+userName2+"userName="+userName);
    return adminMsg;
  }

  public boolean receive(JAXMessage msg) throws RemoteException
  {
    if(msg != null && msg.getUser().equals(userName1))
    {
      userList1.add(msg);
      return true;
    }
    else if(msg != null && msg.getUser().equals(userName2))
    {
      userList2.add(msg);
      return true;
    }
    return false;
  }

}