/*
 *
 * Copyright (c) 2000 Scott Oaks and Henry Wong. All Rights Reserved.
 *
 * Permission to use, copy, modify, and distribute this software
 * and its documentation for NON-COMMERCIAL purposes and
 * without fee is hereby granted.
 *
 * This sample source code is provided for example only,
 * on an unsupported, as-is basis. 
 *
 * AUTHOR MAKES NO REPRESENTATIONS OR WARRANTIES ABOUT THE SUITABILITY OF
 * THE SOFTWARE, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
 * TO THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
 * PARTICULAR PURPOSE, OR NON-INFRINGEMENT. AUTHOR SHALL NOT BE LIABLE FOR
 * ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
 * DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES.
 *
 * THIS SOFTWARE IS NOT DESIGNED OR INTENDED FOR USE OR RESALE AS ON-LINE
 * CONTROL EQUIPMENT IN HAZARDOUS ENVIRONMENTS REQUIRING FAIL-SAFE
 * PERFORMANCE, SUCH AS IN THE OPERATION OF NUCLEAR FACILITIES, AIRCRAFT
 * NAVIGATION OR COMMUNICATION SYSTEMS, AIR TRAFFIC CONTROL, DIRECT LIFE
 * SUPPORT MACHINES, OR WEAPONS SYSTEMS, IN WHICH THE FAILURE OF THE
 * SOFTWARE COULD LEAD DIRECTLY TO DEATH, PERSONAL INJURY, OR SEVERE
 * PHYSICAL OR ENVIRONMENTAL DAMAGE ("HIGH RISK ACTIVITIES").  AUTHOR
 * SPECIFICALLY DISCLAIMS ANY EXPRESS OR IMPLIED WARRANTY OF FITNESS FOR
 * HIGH RISK ACTIVITIES.
 */


import java.io.*;
import java.net.*;
import java.rmi.*;
import java.rmi.server.*;
import net.jini.discovery.*;
import com.sun.jini.lookup.*;

public class ConvertServiceImpl implements ConvertService, Serializable, Runnable {

    // Make this transient, so on all clients it will be false (the default
    // serialization value
    transient boolean isServer;
    String remoteHost;            // Host where server socket is running
    int remotePort;               // Port of server socket

    ConvertServiceImpl(String host, int port) {
        remoteHost = host;
        remotePort = port;
        isServer = true;
    }

    public String convert(int i) throws RemoteException {
        Socket sock;
        DataOutputStream dos;
        BufferedReader br;
        String s;

        try {
            // Construct the socket to the remote server. Send it the
            // integer and read the returned string. This should only
            // be called by the client.
            if (isServer)
                throw new IllegalArgumentException("Can't call from server");

            sock = new Socket(remoteHost, remotePort);
            dos = new DataOutputStream(sock.getOutputStream());
            br = new BufferedReader(new InputStreamReader(sock.getInputStream()));
            dos.writeInt(i);
            dos.flush();
            s = br.readLine();
            sock.close();
            return s;
        } catch (Exception e) {
            throw new RemoteException("Convert failed", e);
        }
    }

    public void run() {
        try {
            while (true) {
                // On the server, start the server socket and process results
                if (!isServer)
                    throw new IllegalArgumentException("Should only run on server");
                ServerSocket ss = new ServerSocket(remotePort);
                while (true) {
                    Socket s;
                    try {
                        s = ss.accept();
                    } catch (Exception e) {
                        // Resource error on the server; can't recover
                        return;
                    }
                    DataInputStream dis = new DataInputStream(s.getInputStream());
                    PrintWriter pw = new PrintWriter(s.getOutputStream());
                    Integer I = new Integer(dis.readInt());
                    pw.println(I);
                    pw.flush();
                    s.close();
                }
            } catch (Exception e) {
                // Client disconnected; go get the next client
            }
        }
    }

    public static void main(String[] args) throws Exception {
        System.setSecurityManager(new SecurityManager());
        String[] groups = new String[] { "" };

        // Create the instance of the service; the JoinManager will
        // register it and renew its leases with the lookup service
        ConvertServiceImpl csi = (ConvertServiceImpl) new ConvertServiceImpl(InetAddress.getLocalHost().getHostName(), 3333);
        new Thread(csi).start();

        JoinManager manager = new JoinManager(csi, null, groups,
                                              null, null, null);
    }
}