コード例 #1
0
  public void commandFromConsole(String command) {
    if (command.isEmpty()) return;
    String[] cmdArray = command.split(", ");
    if (cmdArray.length < 1) return;

    CommandType type = CommandType.None;
    try {
      type = CommandType.valueOf(cmdArray[0]);
    } catch (NullPointerException | IllegalArgumentException e) {
      LOG.error("unknown command : {}", e.getMessage());
    }

    switch (type) {
      case GetDeviceList:
        parent.setCommandFromUnit(new GetDeviceListCommand());
        break;
      case Help:
        viewHelp();
        break;
      case Exit:
        parent.setCommandFromUnit(new ExitCommand());
        break;
      case SetDeviceParameter:
        setDeviceParameter(cmdArray);
        break;
      default:
    }
  }
コード例 #2
0
  public static void main(String[] args) {

    if (args.length < 4) {
      System.err.println(
          "Bad parameters: Paramters(s): <server (name or Ip address)> <port> <Op> <Payload>");
      return;
    }

    InetAddress server;
    int port;
    JackMessageOpType op;
    String payload;

    try {
      server = InetAddress.getByName(args[0]);

      port = Integer.parseInt(args[1]);
      if (!NamePortPair.isValidPort(port)) {
        System.err.println("Bad parameters: port must be an integer 1-65535");
        return;
      }

      if (args[2].length() != 1) {
        System.err.println("Bad parameters: op must be a single character");
        return;
      }
      op = JackMessageOpType.getTypeByOpCode(args[2].charAt(0));
      if (op == null) {
        System.err.println("Bad parameters: " + args[2].charAt(0) + " is not a valid op");
        return;
      }

      payload = args[3];
    } catch (NumberFormatException e) {
      System.err.println("Bad parameters: could not parse port");
      return;
    } catch (UnknownHostException e) {
      System.err.println("Communication problem: unable to find server");
      return;
    }

    DatagramSocket clientSocket;

    try {
      clientSocket = new DatagramSocket();
      clientSocket.connect(server, port);
      clientSocket.setSoTimeout(RESPONSE_WAIT_TIMEOUT);
    } catch (IOException e) {
      System.err.println(
          "Communication problem: could connect to " + server.getHostAddress() + ":" + port);
      e.printStackTrace();
      return;
    }

    Message msgToSend;
    DatagramPacket toSend;
    try {
      String msgString = (op.getOpCode() + " " + payload);
      msgToSend = Message.decode(msgString.getBytes(StandardCharsets.US_ASCII));
      toSend = new DatagramPacket(msgToSend.encode(), msgToSend.encode().length);
      clientSocket.send(toSend);
    } catch (NullPointerException | IllegalArgumentException e) {
      System.err.println("Bad parameters: invalid payload " + e.getMessage());
      terminateSocket(clientSocket);
      return;
    } catch (IOException e) {
      System.err.println("Communication problem: send");
      terminateSocket(clientSocket);
      return;
    }

    int trasmitAttemptCount = 0;
    boolean recievedResponse = false;
    DatagramPacket recievedPacket =
        new DatagramPacket(new byte[MAX_PACKET_LENGTH], MAX_PACKET_LENGTH);
    do {
      trasmitAttemptCount++;
      try {
        clientSocket.receive(recievedPacket);
        if (!recievedPacket.getAddress().equals(server)) {
          throw new IOException("Received packet from an unknown source");
        }
      } catch (SocketTimeoutException e) {
        try {
          clientSocket.send(toSend);
        } catch (IOException e1) {
          System.err.println("Communication problem: send");
          terminateSocket(clientSocket);
          return;
        }
        continue;
      } catch (IOException e) {
        System.err.println("Communication problem: unknown");
        terminateSocket(clientSocket);
        return;
      }

      Message recievedMessage;
      try {
        recievedMessage =
            Message.decode(
                Arrays.copyOfRange(recievedPacket.getData(), 0, recievedPacket.getLength()));
      } catch (NullPointerException | IllegalArgumentException e) {
        System.err.println("Invalid message: decode receive " + e.getMessage());
        continue;
      }

      switch (recievedMessage.getOp()) {
        case QUERY:
          System.err.println("Unexpected message type");
          continue;
        case NEW:
          System.err.println("Unexpected message type");
          continue;
        case ERROR:
          System.err.println(
              "Error: " + ((bettercom.jack.serialization.Error) recievedMessage).getErrorMessage());
          terminateSocket(clientSocket);
          return;
        case RESPONSE:
          if (msgToSend.getOp() == JackMessageOpType.QUERY) {
            System.out.println("Recieved: " + recievedMessage);
            recievedResponse = true;
            break;
          } else {
            System.err.println("Unexpected message type");
            continue;
          }
        case ACK_NEW:
          if (msgToSend.getOp() == JackMessageOpType.NEW) {
            if (msgToSend.generatePayload().equals(recievedMessage.generatePayload())) {
              System.out.println("Recieved: " + recievedMessage);
              recievedResponse = true;
              break;
            } else {
              System.err.println("Unexpected ACK");
              continue;
            }
          } else {
            System.err.println("Unexpected message type");
            continue;
          }
        default:
          System.err.println("Invalid message: switch op");
          continue;
      }

    } while ((!recievedResponse) && (trasmitAttemptCount < MAX_RETRY));

    if (trasmitAttemptCount >= MAX_RETRY) {
      System.err.println("No response after 3 retransmissions");
    }
    terminateSocket(clientSocket);
  }