sdis1819-t7g02

package service;

import java.rmi.registry.LocateRegistry;

import java.rmi.registry.Registry;

public class Client {

    private Client() {}

    public static void main(String[] args) {

            System.out.println("CLIENT");

            try

        {

                int argc = args.length;

            if(argc < 2 || argc > 4)

            {

              print_usage();

              return;

            }

            String aux = args[0];

            String[] acess_point = aux.split(":");

            String ip = acess_point[0];

            String id = acess_point[1];

            String sub_protocol = args[1];

            Registry registry = LocateRegistry.getRegistry(ip);

            RMI rmi = (RMI) registry.lookup(id);

            String file_path;

            String response;

            switch(sub_protocol)

            {

              case "BACKUP":

                if(argc != 4)

                {

                        print_error_ops(sub_protocol);

                }

                file_path = args[2];

                int replication_degree = Integer.parseInt(args[3]);

                response = rmi.backup(file_path, replication_degree);

                System.out.println("response: " + response);

                break;

              case "RESTORE":

                if(argc != 3)

                {

                        print_error_ops(sub_protocol);

                }

                file_path = args[2];

                response = rmi.restore(file_path);

                System.out.println("response: " + response);

                break;

              case "DELETE":

                if(argc != 3)

                {

                        print_error_ops(sub_protocol);

                }

                file_path = args[2];

                response = rmi.delete(file_path);

                System.out.println("response: " + response);

                break;

              case "RECLAIM":

                if(argc != 3)

                {

                  print_error_ops(sub_protocol);

                }

                long disk_space = Long.parseLong(args[2]);

                response = rmi.reclaim(disk_space);

                System.out.println("response: " + response);

                break;

              case "STATE":

                if(argc != 2)

                {

                        print_error_ops(sub_protocol);

                }

                response = rmi.state();

                System.out.println("response: " + response);

                break;

            }

        } catch (Exception e) {

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

        }

    }

    public static void print_usage()

    {

      System.out.println("Usage: :\n");

      System.out.println("  java Client <peer_ap> <operation> <opnd_1> <opnd_2> \n");

      System.out.println("  - <peer_ap> -> peer's acess point\n");

      System.out.println("  - <operation> -> Subprotocol ops: BACKUP, RESTORE, DELETE, RECLAIM;  Enhancements: ops with ENH in the end. State: STATE \n");

      System.out.println("  - <opnd_1> -> path name of the file or in case of op RECLAIM the max amout of disk space\n");

      System.out.println("  - <opnd_2>* -> integer that specifies the desired replication degree\n");

    }

    public static void print_error_ops(String error)

    {

      switch(error)

      {

        case "BACKUP":

          System.out.println("ERROR on BACKUP format. Must be:\n");

          System.out.println("> BACKUP <file_path> <replication_degree>");

          break;

        case "RESTORE":

          System.out.println("ERROR on RESTORE format. Must be:\n");

          System.out.println("> RESTORE <file_path>");

          break;

        case "DELETE":

          System.out.println("ERROR on DELETE format. Must be:\n");

          System.out.println("> DELETE <file_path>");

          break;

        case "RECLAIM":

          System.out.println("ERROR on RECLAIM format. Must be:\n");

          System.out.println("> RECLAIM <disk_space>");

          break;

        case "STATE":

          System.out.println("ERROR on STATE format. Must be:\n");

          System.out.println("> RECLAIM <disk_space>");

          break;

         default:

           System.out.println("ERROR. Unkown op");

      }

    }

}