Prentice.Hall.Introduction.to.Java.Programming,.Brief.Version.9th.(2014).[sharethefiles.com]

notifying a player is to invoke a method in the client that sets
appropriate properties in the client or sends messages to a
player. Figure 46.7 illustrates the relationship between clients
and server.
Figure 46.7
The server coordinates the activities with the clients.
All the calls a client makes can be encapsulated in one remote
interface named TicTacToe (Listing 46.7), and all the calls the
server invokes can be defined in another interface named CallBack
(Listing 46.8). These two interfaces are defined as follows:
Listing 46.7 TicTacToeInterface.java
import java.rmi.*;
public interface TicTacToeInterface extends Remote {
/**
* Connect to the TicTacToe server and return the token.
* If the returned token is ' ', the client is not connected to
* the server
*/
public char connect(CallBack client) throws RemoteException;
}
/** A client invokes this method to notify the server of its move*/
public void myMove(int row, int column, char token)
throws RemoteException;
Listing 46.8 CallBack.java
import java.rmi.*;
16