SDIS1819-T2G01

import java.rmi.registry.LocateRegistry;

import java.rmi.registry.Registry;

public class Client {

    private Client() {

    }

    public static void main(String[] args) {

        // Command parameters

        String[] opnd = { "operand", "opnd1", "opnd2" };

        // Process Arguments

        // 2 arguments can only be STATE check

        if (args.length == 2) {

            opnd[0] = "STATE";

        }

        // 3 arguments can only be RECLAIM/DELETE/RESTORE

        else if (args.length == 3) {

            switch (args[1]) {

            case "RESTORE":

                opnd[0] = "RESTORE";

                // File

                opnd[1] = args[2];

                break;

            case "DELETE":

                opnd[0] = "DELETE";

                // File

                opnd[1] = args[2];

                break;

            case "RECLAIM":

                opnd[0] = "RECLAIM";

                // Reclaim size

                opnd[1] = args[2];

                break;

            default:

                System.out.println("Error: Invalid operation name");

                return;

            }

        }

        // 4 arguments can only be BACKUP

        else if (args.length == 4) {

            opnd[0] = "BACKUP";

            // File

            opnd[1] = args[2];

            // Replication level

            opnd[2] = args[3];

        }

        // Any more arguments are invalid too

        else {

            System.out.println("Invalid number of arguments");

            return;

        }

        // Peer Id to takeover

        String idPeer = args[0];

        try {

            // Lookup for RMI

            Registry registry = LocateRegistry.getRegistry();

            // Lookup for peer access point

            PeerInterface stub = (PeerInterface) registry.lookup(idPeer);

            // Identify action

            switch (opnd[0]) {

            case "BACKUP":

                stub.backup(opnd[1], Integer.parseInt(opnd[2]));

                break;

            case "RESTORE":

                stub.restore(opnd[1]);

                break;

            case "DELETE":

                stub.delete(opnd[1]);

                break;

            case "RECLAIM":

                stub.reclaim(Integer.parseInt(opnd[1]));

                break;

            default:

                break;

            }

        } catch (Exception e) {

            System.err.println("Client exception: " + e.toString());

            e.printStackTrace();

        }

    }

}