Defining the Server Interface

The server interface defines methods for registering a client, and posting a message to the server.

Listing 11.1 ServerInterface.java

import java.rmi.*;

// Remote server interface
public interface ServerInterface 
	extends Remote{
	
	//method used to post a message to the
	//server.
	public void passMessage(String message)
		throws RemoteException;
	
	//method used to register a client. 
	//It gets a reference
	//to the remote client that is 
	//used to identify the client.
	public String getRegistered(ClientInterface ci)
	 throws RemoteException;
	}

Explanation

The first method is the passMessage() method. This method is used to pass a message to server. The method takes a string object as parameter.

public void passMessage(String message)
	throws RemoteException;

The getRegistered() method is used by the clients to get registered with the server. The method takes a reference to the remote client as its argument.

public String getRegistered(ClientInterface ci)
	 throws RemoteException;