import java.rmi.*;
import java.rmi.server.*;
import java.util.Vector;
/**
 * Remote Class for the chat server for ex6
 */
public class ChatServer extends UnicastRemoteObject implements ChatInterface {

	private int messId = 0;
	private Vector<String> messages;
	private int sleepTime = 10; // ms sleep if no message was replied

	public ChatServer(int sleep) throws RemoteException {
		messId = 0;
		messages = new Vector<String>();
		sleepTime = 10;
	}

  /**
   * Method to find out what message to poll
   * @return the next (expected) message-id
   * @exception RemoteException if the remote invocation fails.
   */
  public int getMessId() throws RemoteException {
	  /* clip */
  }
  

  /**
   * Method to join a chat
   * @param username your username string for chat
   * @return the next (expected) message-id, -1 if not success
   * @exception RemoteException if the remote invocation fails.
   */
  public int join(String username) throws RemoteException {
	  /* clip */
  }


  
  /**
   * Poll for a new message
   * @param messageid the message id requested
   * @return A string containing the username and the message, null
   * if no such message is available. Username of the message sender
   * is the first word (space separated) of the message.
   * @exception RemoteException if the remote invocation fails.
   */
  public String pollMessage(int messageid) throws RemoteException {
	  if (messageid < messId) {
	  /* clip */
	  } else {
		  try {
			  Thread.sleep(sleepTime);
		  } catch (InterruptedException e) {
		  };
		  return null;
	  }
  }


  /**
   * Post a new message
   * @param username sender's username
   * @param message the message
   * @return the message id
   * @exception RemoteException if the remote invocation fails.
   */
  public int postMessage(String username, String message) throws RemoteException {
	  /* clip */
  }
	  

  
  /**
   * Disconnect a chat (actually, we could have done without this)
   * @param username your username
   * @exception RemoteException if the remote invocation fails.
   */
  public void disconnect(String username) throws RemoteException {
	  /* clip */
  }

} // class ChatServer