root / trunk / code / projects / colonet / client / ColonetServerInterface.java @ 670
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/*
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* ColonetServerInterface.java
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* Gregory Tress
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*/
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import java.net.*; |
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import java.io.*; |
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import javax.swing.JOptionPane; |
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import javax.swing.JTextArea; |
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/**
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* The Colonet server interface class. This class handles direct communication with the Colonet server. The general
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* contract is that this class will encapsulate the process of sending commands and requests to the server and
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* receiving responses. This class should provide methods to send specific commands and requests so that the
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* Colonet can easily communicate with the server. When data is received from the server, the ColonetServerInterface
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* decides how to handle it and in many cases this means simply passing it to the Colonet.
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* <p>
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* The motivation is that any number of Colonet-type classes could be designed for different purposes if needed, with
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* this class being used by each one for communication.
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* For instance, if an application is designed which only monitors sensor data, or that only has access to
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* the task queue, etc., the application could easily plug in to this interface.
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* The Colonet should generally not contain communication-specific code or Strings of command and request data.
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* If additional commands and requests are needed for permanent implementation, it is suggested that convenience
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* classes be created in the ColonetServerInterface and called from the Colonet.
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*
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* @author Gregory Tress
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*/
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public class ColonetServerInterface |
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{ |
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/* Old packet structure:
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COMMAND PACKET STRUCTURE
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1: SEND_TO_ROBOT
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2: # of robot, or GLOBAL_DEST
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3: COLONET_COMMMAND
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4: message code (i.e. ORB_SET)
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5: any data, as many that fit in the packet
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REQUEST PACKET STRUCTURE
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1: REQUEST_FROM_SERVER
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2: # of robot
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3: COLONET_REQUEST
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4: ???
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9/12/07 New server interface structure
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Client will no longer send full robot packets to the server.
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Commands will be defined as necessary.
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*/
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//General Colonet Interface
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public static final String SEND_TO_ROBOT = "0"; |
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public static final String REQUEST_FROM_SERVER = "1"; |
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public static final String RESPONSE_TO_CLIENT_REQUEST = "2"; |
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public static final String REQUEST_BOM_MATRIX = "144"; |
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public static final String REQUEST_XBEE_IDS = "145"; |
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public static final String COLONET_COMMAND = "13"; //0x0D |
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public static final String COLONET_REQUEST = "14"; //0x0E |
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public static final String CORONET_RESPONSE = "15"; //0x0F |
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public static final String GLOBAL_DEST = "200"; |
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public static final String CLIENT_REQUEST_ROBOT_POSITIONS = "86"; |
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public static final String CLIENT_ASSIGN_ROBOT_ID = "87"; |
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public static final String CLIENT_SET_VIRTUAL_WALL = "89"; |
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public static final String MOVE_TO_ABSOLUTE_POSITION = "83"; //0x53 |
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//Queue instructions
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public static final String COLONET_QUEUE = "100"; |
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public static final String QUEUE_UPDATE = "101"; |
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public static final String QUEUE_ADD = "102"; |
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public static final String QUEUE_REMOVE = "103"; |
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public static final String QUEUE_REORDER = "104"; |
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//Use BATTERY to request battery level
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public static final String BATTERY = "56"; //0x38 |
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//MOTORS
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public static final String MOTORS_INIT = "23"; //0x17 |
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public static final String MOTOR1_SET = "24"; //0x18 |
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public static final String MOTOR2_SET = "25"; //0x19 |
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public static final String MOTORS_OFF = "26"; //0x1A |
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public static final String MOVE = "27"; //0x1B |
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public static final String MOVE_AVOID = "28"; //0x1C |
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public static final String MOVE_R = "29"; //0x1D |
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public static final String MOVE_L = "30"; //0x1E |
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public static final String MOVE_F = "31"; //0x1F |
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public static final String MOVE_B = "32"; //0x1G |
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//BUZZER
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public static final String BUZZER_INIT = "0"; //0x00 |
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public static final String BUZZER_SET_VAL = "1"; //0x01 |
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public static final String BUZZER_SET_FREQ = "2"; //0x02 |
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public static final String BUZZER_CHIRP = "3"; //0x03 |
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public static final String BUZZER_OFF = "4"; //0x04 |
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//ORB
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public static final String ORB_INIT = "12"; //0x0C |
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public static final String ORB_SET = "13"; //0x0D |
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public static final String ORB_SET_COLOR = "14"; //0x0E |
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public static final String ORB_DISABLE = "15"; //0x0F |
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public static final String ORB_ENABLE = "16"; //0x10 |
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public static final String ORB_SET_DIO = "17"; //0x11 |
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public static final String LED_INIT = "18"; //0x12 |
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public static final String LED_USER = "19"; //0x13 |
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public static final String ORB_SET_NUM_NS = "20"; //0x14 |
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public static final String ORB_SET_NUM = "21"; //0x15 |
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public static final String ORB_SEND = "22"; //0x16 |
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Colonet colonet; //save reference to the entire applet locally
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Socket socket;
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OutputStreamWriter out;
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BufferedReader reader;
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DataListener dataListener; |
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/*
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* FUNCTION IMPLEMENTATIONS
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*/
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/**
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* Constructs a new ColonetServerInterface. When constructing a ColonetServerInterface, a valid Colonet object
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* reference must be provided to ensure that data is routed correctly.
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*
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* @param colonet The Colonet object to save locally. This reference cannot be changed once the
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* ColonetSreverInterface has been contsructed.
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* @throws NullPointerException if colonet is null
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*
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*/
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public ColonetServerInterface (Colonet colonet) {
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this.colonet = colonet;
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dataListener = new DataListener();
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} |
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public Socket getSocket () { |
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return socket;
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} |
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public OutputStreamWriter getOutputStreamWriter () { |
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return out;
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} |
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public BufferedReader getBufferedReader () { |
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return reader;
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} |
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public boolean isReady () { |
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if (socket == null || out == null || reader == null) |
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return false; |
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if (!socket.isConnected() || socket.isClosed() || socket.isInputShutdown() || socket.isOutputShutdown())
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return false; |
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return true; |
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} |
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public boolean isInputReady () { |
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try {
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if (reader.ready()) return true; |
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} catch (Exception e) { |
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return false; |
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} |
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return false; |
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} |
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public String getLine () throws IOException { |
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return reader.readLine();
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} |
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/**
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* Create socket connection to Colonet server.
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* If successful, start thread for listening for incoming data.
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*/
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public void connect (String strHost, String strPort) { |
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//make sure hostname and port are valid
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if (strHost.equals("") || strPort.equals("")) { |
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err("Please enter a hostname and port.");
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return;
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} |
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int port = 0; |
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try {
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port = Integer.parseInt(strPort);
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} catch (Exception e) { |
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err("Invalid port");
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return;
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} |
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//make sure we aren't already connected.
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if (socket != null && socket.isConnected()) { |
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return;
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} |
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try {
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socket = new Socket(strHost, port); |
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socket.setKeepAlive(true);
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} catch (UnknownHostException e) { |
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err("Unknown Host Exception");
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return;
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} catch (IOException e) { |
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err("Failed to connect to " + strHost + ".\n"); |
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return;
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} catch (java.security.AccessControlException e) {
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err("Permission denied.\n\n"
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+ "You may only connect to the server from which this applet was loaded.");
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return;
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} |
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if (socket == null || !socket.isConnected()) { |
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return;
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} |
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try {
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out = new OutputStreamWriter(socket.getOutputStream()); |
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reader = new BufferedReader(new InputStreamReader(socket.getInputStream())); |
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} catch (IOException e) { |
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warn("Could not get transfer streams from socket connection.");
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} |
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dataListener.start(); |
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} |
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public void disconnect () { |
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try {
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if (reader != null) { |
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reader.close(); |
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} |
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if (out != null) { |
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out.close(); |
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} |
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colonet.disconnect(); |
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} catch (IOException e) { |
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} |
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} |
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/*
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* Send a general String to the OutputStream.
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*/
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private void sendString (String s) { |
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//make sure we can send
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if (!this.isReady()) { |
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colonet.getInfoPanel().append("Could not send data.\n");
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return;
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} |
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//send packet
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try {
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Thread.sleep(100); //pause to be safe |
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out.write(s); |
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out.flush(); |
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} catch (IOException e) { |
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colonet.getInfoPanel().setText("Could not send data.\n");
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} catch (InterruptedException e) { |
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} |
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} |
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/**
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* General send-to-server method. This method is used by other command methods, which are usually convenience
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* methods that simply specify arguments to this method. A command consists of a String which holds integers
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* separated by spaces. This method should not be used directly unless you know the format of the particular
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* command you are sending. If implementing a particular command for permanent use, it is recommended that
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* you create a new wrapper method specific to that command in the ColonetServerInterface file.
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*
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* Note that no checking is performed in this method to ensure the correct formatting of the String arguments.
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* If malformed commands or robot numbers are specified, the behavior of the request at the server will be
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* undefined and could result in server failure.
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*
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* @param s The command String in its correct format. The format of a command String is ultimately specified
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* by the Colonet server application and may change.
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* @param robotNumber The number of the robot that is the subject of the command, if any. The robot number
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* is specified as a single integer in a String. If the command does not have a single robot subject, this
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* argument can be null or an empty String, whichever is convenient.
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*/
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public void sendData (String s, String robotNumber) { |
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//create packet
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String packet = ""; |
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packet += ColonetServerInterface.SEND_TO_ROBOT; |
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if (robotNumber != null) |
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packet += " " + robotNumber;
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packet += " " + ColonetServerInterface.COLONET_COMMAND;
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packet += " " + s; //add the command code here |
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packet += "\n";
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sendString(packet); |
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//colonet.getInfoPanel().append("S:" + packet);
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} |
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/**
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* General request-from-server method. This method is used by other request methods, which are usually convenience
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* methods that simply specify arguments to this method. A request consists of a String which holds integers
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* separated by spaces. This method should not be used directly unless you know the format of the particular
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* request you are making. If implementing a particular request, it is recommended that you create a new method
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* specific to that request in the ColonetServerInterface file.
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*
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*/
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private void sendRequest (String s, String robotNumber) { |
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//create packet
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String packet = ""; |
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packet += ColonetServerInterface.REQUEST_FROM_SERVER; |
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packet += " " + robotNumber;
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packet += " " + s; //add the command code here |
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packet += "\n";
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sendString(packet); |
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} |
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/**
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* Sends a request to the server to report the entire BOM sensor matrix. The server will reply at its convenience.
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* No guarantee is made (end-to-end or otherwise) that the server will respond in a timely manner or at all
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* to any individual request.
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*/
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public void sendSensorDataRequest () { |
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sendRequest(ColonetServerInterface.REQUEST_BOM_MATRIX, "");
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} |
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/**
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* Sends a request to the server to report a list of XBee IDs. The server will reply at its convenience.
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* The purpose of having this list is to ensure that robots are properly identified for control purposes.
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* This keeps robot identification consistent between sessions and prevents arbitrary assignment.
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* No guarantee is made (end-to-end or otherwise) that the server will respond in a timely manner or at all
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* to any individual request.
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*
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* @see Colonet#parseXBeeIDs(String)
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*/
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public void sendXBeeIDRequest () { |
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sendRequest(ColonetServerInterface.REQUEST_XBEE_IDS, "");
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} |
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/**
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* Sends a battery request for a specific robot to the server. The server will reply at its convenience.
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* Behavior is undefined if an invalid robot number is specified. The server will probably not respond in
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* this case.
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* No guarantee is made (end-to-end or otherwise) that the server will respond in a timely manner or at all
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* to any individual request.
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*
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* @param robotNum The number of the robot for which we are requesting the battery. Note that this value
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* is sent as-is to the server. No mapping to or from XBee IDs is performed. The contract for this is
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* currently undefined.
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* @see Colonet#parseBattery(String)
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*/
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public void sendBatteryRequest (int robotNum) { |
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//create packet
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String packet = ""; |
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packet += ColonetServerInterface.SEND_TO_ROBOT; |
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packet += " " + robotNum;
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packet += " " + ColonetServerInterface.COLONET_REQUEST;
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packet += " " + ColonetServerInterface.BATTERY; //add the command code here |
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packet += "\n";
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sendString(packet); |
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//System.out.println("Sent battery request: " + packet);
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} |
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/**
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* Requests a list of all robot positions and correspondind robot IDs.
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*/
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public void sendPositionRequest () { |
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sendRequest(ColonetServerInterface.CLIENT_REQUEST_ROBOT_POSITIONS, "");
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} |
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/**
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* Send a robot ID assignment update to store on the server.
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*/
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public void sendIDAssignment (int oldID, int newID) { |
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String packet = ""; |
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packet += ColonetServerInterface.REQUEST_FROM_SERVER; |
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packet += " " + CLIENT_ASSIGN_ROBOT_ID;
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packet += " " + oldID + " " + newID; |
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packet += "\n";
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sendString(packet); |
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} |
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/**
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* Order a robot to move to an absolute coordinate point.
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*/
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public void sendAbsoluteMove (int id, int x, int y) { |
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int x_high = (x>>8) & 0xff; |
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int x_low = x & 0xff; |
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int y_high = (y>>8) & 0xff; |
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int y_low = y & 0xff; |
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sendData(MOVE_TO_ABSOLUTE_POSITION + " " + x_high + " " + x_low + " " + y_high + " " + y_low, "" + id); |
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} |
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/**
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* Establish a boundary for robot motion.
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*/
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public void sendBoundary (int x1, int y1, int x2, int y2) { |
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String packet = ""; |
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packet += ColonetServerInterface.REQUEST_FROM_SERVER; |
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packet += " " + CLIENT_SET_VIRTUAL_WALL;
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packet += " " + x1 + " " + y1 + " " + x2 + " " + y2; |
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packet += "\n";
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sendString(packet); |
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} |
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/*
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* Queue management
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*/
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private void sendQueueInstruction (String inst) { |
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String packet = ""; |
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packet += ColonetServerInterface.COLONET_QUEUE; |
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packet += " " + inst;
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packet += "\n";
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sendString(packet); |
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} |
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/**
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* Notifies the Colonet server to add a task to the current task queue. The Colonet server holds the canonical
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* task queue. Any applet can send tasks to add to the queue. Local copies of the queue in the applet are for
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* display purposes only, and are not authoritative when adding tasks. All clients send additions asynchronously,
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* and as a result no guarantee is made that a task will be added in the specificed location in the queue or at
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* all. If an invalid position is specified, the task will probably not be added to the queue and may cause
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* server failure. Due to the asynchronous nature of the queue, we cannot easily account for concurrent
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* modification failures on the client side.
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*
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* @param pos The position in the queue at which we would like the task to be placed. Note that this is not
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* guaranteed. Invalid positions may cause the task to be discarded at the server.
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* @param data The String containing the command code(s) for the task and any arguments necessary to fully
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* define the behavior of the task. This format is currently not specified. In the future, the canonical format
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* of the data String will ultimately be defined by the Colonet server.
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* @param description A String that contains a description of the task. This will be the message displayed to
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* the user when information about the task is requested.
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*/
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public void sendQueueAdd (int pos, String data, String description) { |
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String packet = ""; |
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packet += ColonetServerInterface.QUEUE_ADD; |
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packet += " " + pos;
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packet += " " + data;
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packet += " [" + description + "]"; |
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packet += "\n";
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sendQueueInstruction(packet); |
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} |
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/**
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* Notifies the Colonet server to remove a task from the current task queue. The Colonet server holds the canonical
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* task queue. Any applet can remove a task from the queue. Local copies of the queue in the applet are for
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* display purposes only, and are not authoritative when removing tasks. All clients remove tasks asynchronously,
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* and as a result no guarantee is made that the correct task will actually be removed.
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* If an invalid position is specified, the state of the queue is undefined and server failure may result.
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* Due to the asynchronous nature of the queue, we cannot easily account for concurrent
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* modification failures on the client side.
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*
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* @param pos The position in the queue at which we would like the task to be removed. Note that this is not
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* guaranteed. Invalid positions may result in a corrupted queue.
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*/
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public void sendQueueRemove (int pos) { |
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String packet = ""; |
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packet += ColonetServerInterface.QUEUE_REMOVE; |
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packet += " " + pos;
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packet += "\n";
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sendQueueInstruction(packet); |
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} |
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/**
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* Notifies the Colonet server to reorder tasks in the current task queue. The Colonet server holds the canonical
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* task queue. Any applet can reorder tasks in the queue. Local copies of the queue in the applet are for
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* display purposes only, and are not authoritative when reordering tasks. All clients reorder tasks asynchronously,
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* and as a result no guarantee is made that the correct tasks will actually be reordered.
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* If an invalid position is specified, the state of the queue is undefined and server failure may result.
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* Due to the asynchronous nature of the queue, we cannot easily account for concurrent
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* modification failures on the client side.
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*
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* @param pos1 The queue position of a task which we would like to reorder.
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* @param pos2 The queue position of a task which we would like to reorder.
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*/
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public void sendQueueReorder (int pos1, int pos2) { |
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String packet = ""; |
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packet += ColonetServerInterface.QUEUE_REORDER; |
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packet += " " + pos1;
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packet += " " + pos2;
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packet += "\n";
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sendQueueInstruction(packet); |
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} |
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public void sendQueueUpdate () { |
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sendQueueInstruction(ColonetServerInterface.QUEUE_UPDATE); |
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} |
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|
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/**
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* Display informational message box on the screen. Used for casual communicaton to the user.
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* @param text Text to display
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*/
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public void msg (String text) { |
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JOptionPane.showMessageDialog(colonet, text, "Colonet", JOptionPane.INFORMATION_MESSAGE); |
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} |
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|
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/**
|
479 |
* Display warning message box on the screen. Used for minor alerts or exceptions.
|
480 |
* @param text Text to display
|
481 |
*/
|
482 |
public void warn (String text) { |
483 |
JOptionPane.showMessageDialog(colonet, text, "Colonet", JOptionPane.WARNING_MESSAGE); |
484 |
} |
485 |
|
486 |
/**
|
487 |
* Display error message box on the screen. Used for major errors or exceptions in the program.
|
488 |
* @param text Text to display
|
489 |
*/
|
490 |
public void err (String text) { |
491 |
JOptionPane.showMessageDialog(colonet, text, "Colonet", JOptionPane.ERROR_MESSAGE); |
492 |
} |
493 |
|
494 |
|
495 |
/*
|
496 |
* DataListener thread.
|
497 |
*
|
498 |
*/
|
499 |
class DataListener extends Thread { |
500 |
final int DATALISTENER_DELAY = 122; |
501 |
|
502 |
public DataListener () {
|
503 |
super("Colonet DataListener"); |
504 |
} |
505 |
|
506 |
public void run () { |
507 |
String line;
|
508 |
while (true) { |
509 |
try {
|
510 |
line = reader.readLine(); |
511 |
if (line == null) { |
512 |
throw new IOException(); |
513 |
} |
514 |
parseData(line); |
515 |
Thread.sleep(DATALISTENER_DELAY);
|
516 |
} catch (InterruptedException e) { |
517 |
return;
|
518 |
} catch (IOException e) { |
519 |
disconnect(); |
520 |
return;
|
521 |
} |
522 |
} |
523 |
} |
524 |
|
525 |
public void parseData (String line) { |
526 |
// Sensor Matrix
|
527 |
if (line.startsWith(ColonetServerInterface.RESPONSE_TO_CLIENT_REQUEST + " " + |
528 |
ColonetServerInterface.REQUEST_BOM_MATRIX)) |
529 |
colonet.parseMatrix(line); |
530 |
// Task Queue
|
531 |
else if (line.startsWith(ColonetServerInterface.COLONET_QUEUE)) |
532 |
colonet.parseQueue(line); |
533 |
// XBee IDs
|
534 |
else if (line.startsWith(ColonetServerInterface.RESPONSE_TO_CLIENT_REQUEST + " " + |
535 |
ColonetServerInterface.REQUEST_XBEE_IDS)) |
536 |
colonet.parseXBeeIDs(line); |
537 |
// Battery
|
538 |
else if (line.startsWith(ColonetServerInterface.RESPONSE_TO_CLIENT_REQUEST + " " + |
539 |
ColonetServerInterface.BATTERY)) |
540 |
colonet.parseBattery(line); |
541 |
// Robot Positions
|
542 |
else if (line.startsWith(ColonetServerInterface.RESPONSE_TO_CLIENT_REQUEST + " " + |
543 |
ColonetServerInterface.CLIENT_REQUEST_ROBOT_POSITIONS)) |
544 |
colonet.parsePositions(line); |
545 |
// Unknown type
|
546 |
else {
|
547 |
System.out.println("Got unknown data: " + line + "\n"); |
548 |
} |
549 |
} |
550 |
} |
551 |
} |