Re: A real jini service

Mark Brouwer wrote:
> While I believe there is no formal definition of what represents a "Jini
> service" I would say that if your chat service is specified by a (Java)
> interface (representing the chat API) and that some service code
> implements that interface and the service is able to find a lookup
> service and register the code with the lookup service you have a Jini
> service. It doesn't matter whether you implement the communication
> protocol using RMI or plain sockets, or something else for that matter.

For example, the service interface might be something like

public interface ChatService extends Remote {
        public ChatConnection connect( UserID id ) throws RemoteException;
}

and ChatConnection would then wrap up the logic that you need for connecting and
running the session as in

public class ChatConnection implements Serializable, Runnable {
        private String host;
        private int port;
        private Uuid sessionId;
        private volatile boolean done;

        public ChatConnection( String host, int port, Uuid id ) {
                this.host = host;
                this.port = port;
                this.sessioinId = id;
        }

        public void addSessionListener( SessionListener lis ) {
                // add more listeners
        }

        public void connect( SessionListener lis ) throws IOException {
                if( s != null ) {
                        throw new IOException( "Already Connected" );
                }
                s = new Socket( host, port );
                addSessionListener( lis );
                login();
                new Thread(this).start();
        }

        private void login() {
                // send sessionId to authenticate
        }

        public void run() {
                while( !done ) {
                        try {
                                // receive events on socket
                                // and send to listeners
                        } catch( IOException ex ) {
                                // log exception
                                // send event to listeners
                                // maybe try reconnect
                                // maybe just break;
                        }
                }
                // close socket and set s to null
        }

        ... other needed methods ...
}

Gregg Wonderly

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