Merge remote-tracking branch 'origin/Story1247_AutoDiscovery' into NewUI

# Conflicts:
#	pom.xml
#	src/main/java/seng302/App.java
#	src/main/java/seng302/visualiser/controllers/StartScreenController.java
#	src/main/resources/views/StartScreenView.fxml

src/main/java/seng302/App.java

@@ -8,14 +8,13 @@ import javafx.scene.Parent;
 import javafx.scene.Scene;
 import javafx.scene.image.Image;
 import javafx.stage.Stage;
-import org.apache.commons.cli.CommandLine;
-import org.apache.commons.cli.CommandLineParser;
-import org.apache.commons.cli.DefaultParser;
-import org.apache.commons.cli.Options;
-import org.apache.commons.cli.ParseException;
+import org.apache.commons.cli.*;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 import seng302.visualiser.controllers.ViewManager;
+import seng302.gameServer.ServerAdvertiser;
+
+import java.io.IOException;
 
 public class App extends Application {
 
@@ -86,6 +85,21 @@ public class App extends Application {
         primaryStage.setScene(scene);
         primaryStage.show();
 
+        primaryStage.setOnCloseRequest(e -> {
+//            ClientPacketParser.appClose();
+//            ClientPacketParser.appClose();
+
+
+            try {
+                ServerAdvertiser.getInstance().unregister();
+            } catch (IOException e1) {
+                logger.warn("Could not un-register game");
+            }
+
+            System.exit(0);
+        });
+
+//        ClientState.primaryStage = primaryStage;
         primaryStage.setOnCloseRequest(e -> System.exit(0));
     }
 
@@ -94,6 +108,8 @@ public class App extends Application {
             parseArgs(args);
         } catch (ParseException e) {
             logger.error("Could not parse command line arguments");
+        } catch (IOException e) {
+            e.printStackTrace();
         }
 
         launch(args);

src/main/java/seng302/gameServer/GameState.java

@@ -1,37 +1,22 @@
 package seng302.gameServer;
 
-import java.util.ArrayList;
-import java.util.Collections;
-import java.util.HashMap;
-import java.util.List;
-import java.util.Map;
-import java.util.Set;
 import javafx.scene.paint.Color;
-import javax.xml.parsers.DocumentBuilder;
-import javax.xml.parsers.DocumentBuilderFactory;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 import org.w3c.dom.Document;
 import org.xml.sax.InputSource;
-import seng302.gameServer.messages.BoatAction;
-import seng302.gameServer.messages.BoatStatus;
-import seng302.gameServer.messages.CustomizeRequestType;
-import seng302.gameServer.messages.MarkRoundingMessage;
-import seng302.gameServer.messages.MarkType;
-import seng302.gameServer.messages.Message;
-import seng302.gameServer.messages.RoundingBoatStatus;
-import seng302.gameServer.messages.YachtEventCodeMessage;
-import seng302.model.GeoPoint;
-import seng302.model.Limit;
-import seng302.model.Player;
-import seng302.model.PolarTable;
-import seng302.model.ServerYacht;
+import seng302.gameServer.messages.*;
+import seng302.model.*;
 import seng302.model.mark.CompoundMark;
 import seng302.model.mark.Mark;
 import seng302.model.mark.MarkOrder;
 import seng302.utilities.GeoUtility;
 import seng302.utilities.XMLParser;
 
+import javax.xml.parsers.DocumentBuilder;
+import javax.xml.parsers.DocumentBuilderFactory;
+import java.util.*;
+
 /**
  * A Static class to hold information about the current state of the game (model)
  * Also contains logic for updating itself on regular time intervals on its own thread
@@ -699,4 +684,11 @@ public class GameState implements Runnable {
     public static void resetCustomizationFlag() {
         customizationFlag = false;
     }
+
+    public static Integer getSpacesLeft(){
+        Integer numberOfPlayers = GameState.getPlayers().size();
+        Integer maxPlayers = GameState.MAX_PLAYERS;
+
+        return maxPlayers - numberOfPlayers - 1;
+    }
 }

src/main/java/seng302/gameServer/MainServerThread.java

@@ -1,14 +1,26 @@
 package seng302.gameServer;
 
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.w3c.dom.Document;
+import org.xml.sax.InputSource;
+import org.xml.sax.SAXException;
 import seng302.gameServer.messages.*;
 import seng302.model.GeoPoint;
 import seng302.model.Player;
 import seng302.model.PolarTable;
 import seng302.model.ServerYacht;
 import seng302.model.mark.CompoundMark;
+import seng302.model.stream.xml.parser.RegattaXMLData;
 import seng302.utilities.GeoUtility;
+import seng302.utilities.XMLGenerator;
+import seng302.utilities.XMLParser;
 
+import javax.xml.parsers.DocumentBuilder;
+import javax.xml.parsers.DocumentBuilderFactory;
+import javax.xml.parsers.ParserConfigurationException;
 import java.io.IOException;
+import java.io.StringReader;
 import java.net.ServerSocket;
 import java.time.LocalDateTime;
 import java.util.*;
@@ -37,6 +49,42 @@ public class MainServerThread implements Runnable, ClientConnectionDelegate {
 
     private ServerSocket serverSocket = null;
     private ArrayList<ServerToClientThread> serverToClientThreads = new ArrayList<>();
+    private Logger logger = LoggerFactory.getLogger(MainServerThread.class);
+
+    private void startAdvertisingServer(){
+        DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
+        DocumentBuilder db;
+        Document doc;
+        XMLGenerator generator = new XMLGenerator();
+
+        try {
+            db = dbf.newDocumentBuilder();
+            String regatta = generator.getRegattaAsXml();
+            StringReader stringReader = new StringReader(regatta);
+            InputSource is = new InputSource(stringReader);
+            doc = db.parse(is);
+        } catch (ParserConfigurationException | IOException | SAXException e) {
+            logger.warn("Couldn't load race regatta");
+            return;
+        }
+
+        RegattaXMLData regattaXMLData = XMLParser.parseRegatta(doc);
+
+        Integer spacesLeft = GameState.getSpacesLeft();
+
+        // No spaces left on server
+        if (spacesLeft < 1){
+            return;
+        }
+
+        // Start advertising server
+        try{
+            ServerAdvertiser.getInstance().setMapName(regattaXMLData.getCourseName()).setSpacesLeft(spacesLeft);
+            ServerAdvertiser.getInstance().registerGame(PORT, regattaXMLData.getRegattaName());
+        } catch (IOException e) {
+            logger.warn("Could not register server");
+        }
+    }
 
     public MainServerThread() {
         new GameState("localhost");
@@ -45,6 +93,9 @@ public class MainServerThread implements Runnable, ClientConnectionDelegate {
         } catch (IOException e) {
             serverLog("IO error in server thread handler upon trying to make new server socket", 0);
         }
+
+        startAdvertisingServer();
+
         PolarTable.parsePolarFile(getClass().getResourceAsStream("/config/acc_polars.csv"));
         GameState.addMarkPassListener(this::broadcastMessage);
         terminated = false;
@@ -176,6 +227,12 @@ public class MainServerThread implements Runnable, ClientConnectionDelegate {
             }
         });
         serverToClientThread.addDisconnectListener(this::clientDisconnected);
+
+        try {
+            ServerAdvertiser.getInstance().setSpacesLeft(GameState.getSpacesLeft());
+        } catch (IOException e) {
+            logger.warn("Couldn't update advertisement");
+        }
     }
 
     /**
@@ -202,10 +259,23 @@ public class MainServerThread implements Runnable, ClientConnectionDelegate {
             }
         }
         serverToClientThreads.remove(closedConnection);
+
+        try {
+            ServerAdvertiser.getInstance().setSpacesLeft(GameState.getSpacesLeft());
+        } catch (IOException e) {
+            logger.warn("Couldn't update advertisement");
+        }
+
         closedConnection.terminate();
     }
 
     public void startGame() {
+        try {
+            ServerAdvertiser.getInstance().unregister();
+        } catch (IOException e) {
+            logger.warn("Error unregistered server");
+        }
+
         initialiseBoatPositions();
         Timer t = new Timer();
 

src/main/java/seng302/gameServer/ServerAdvertiser.java

@@ -0,0 +1,156 @@
+package seng302.gameServer;
+
+import javax.jmdns.JmDNS;
+import javax.jmdns.ServiceInfo;
+import java.io.IOException;
+import java.net.Inet4Address;
+import java.net.InetAddress;
+import java.net.NetworkInterface;
+import java.util.Enumeration;
+import java.util.Hashtable;
+
+/**
+ * Advertises the game server on the local network
+ */
+public class ServerAdvertiser {
+    /*
+    Our service name & protocol
+
+    This must be in the format _Service._Proto.Name as per http://www.ietf.org/rfc/rfc2782.txt
+    Where Service is unique on the network, and protocol is usually _tcp.
+
+    The pseudo-domain 'local.' must end in a full-stop. This is used to indicate that
+    the lookup should be performed using an IP multicast query on the local IP network.
+
+    Read this before changing any of the following values
+    https://developer.apple.com/library/content/documentation/Cocoa/Conceptual/NetServices/Articles/domainnames.html#//apple_ref/doc/uid/TP40002460-SW1
+     */
+    private static String SERVICE = "_partyatsea";
+    private static String PROTOCOL = "_tcp";
+    public static String SERVICE_TYPE = SERVICE + "." + PROTOCOL + ".local.";
+
+    private static ServerAdvertiser instance = null;
+    private static JmDNS jmdnsInstance = null;
+    private ServiceInfo serviceInfo; // Note: Whenever this is changed, our service will be re-registered on the network.
+
+    private Hashtable<String ,String> props;
+
+    private ServerAdvertiser() throws IOException{
+        jmdnsInstance = JmDNS.create(InetAddress.getByName(getLocalHostIp()));
+
+        props = new Hashtable<>();
+        props.put("map", "");
+        props.put("spacesLeft", "0");
+    }
+
+    /**
+     * Get an instance of the ServerAdvertiser, create an instance if there isn't already one
+     * @return A ServerAdvertiser Instance
+     * @throws IOException If there was an exception creating the instance
+     */
+    public static ServerAdvertiser getInstance() throws IOException {
+        if (instance == null){
+            instance = new ServerAdvertiser();
+        }
+
+        return instance;
+    }
+
+    /**
+     * Set the map name and broadcast an update on the network
+     * @param mapName The new map name
+     * @return The current ServerAdvertiser instance
+     */
+    public ServerAdvertiser setMapName(String mapName){
+        props.replace("map", mapName);
+
+        if (serviceInfo != null){
+            serviceInfo.setText(props);
+        }
+
+        return instance;
+    }
+
+    /**
+     * Set the spaces left on the server and broadcast an update on the network
+     * @param spacesLeft The number of spaces left on the server
+     * @return The current ServerAdvertiser instance
+     */
+    public ServerAdvertiser setSpacesLeft(Integer spacesLeft){
+        props.replace("spacesLeft", spacesLeft.toString());
+
+        if (serviceInfo != null){
+            serviceInfo.setText(props);
+        }
+
+        return instance;
+    }
+
+    /**
+     * Register this service on the network
+     *
+     * Note: other parameters (map name/spaces left etc) are set after the
+     * service has been registered
+     * @param portNo The servers port number
+     * @param serverName The servers name
+     */
+    public void registerGame(Integer portNo, String serverName) {
+
+        serviceInfo = ServiceInfo.create(SERVICE_TYPE, serverName, portNo, 0, 0, props);
+
+        new java.util.Timer().schedule(
+            new java.util.TimerTask() {
+                @Override
+                public void run() {
+                    try {
+                        jmdnsInstance.registerService(serviceInfo);
+                    } catch (IOException e) {
+                        System.out.println("Failed");
+                    }
+                }
+            }, 0);
+    }
+
+    /**
+     * Unregister the service
+     */
+    public void unregister(){
+        if (serviceInfo != null)
+            jmdnsInstance.unregisterService(serviceInfo);
+    }
+
+    /**
+     * Gets the local host ip address.
+     *
+     * @return the localhost ip address
+     */
+    public static String getLocalHostIp() {
+        String ipAddress = null;
+        try {
+            Enumeration<NetworkInterface> e = NetworkInterface.getNetworkInterfaces();
+            while (e.hasMoreElements()) {
+                NetworkInterface ni = e.nextElement();
+                if (ni.isLoopback())
+                    continue;
+                if(ni.isPointToPoint())
+                    continue;
+                if(ni.isVirtual())
+                    continue;
+
+                Enumeration<InetAddress> addresses = ni.getInetAddresses();
+                while(addresses.hasMoreElements()) {
+                    InetAddress address = addresses.nextElement();
+                    if(address instanceof Inet4Address) {    // skip all ipv6
+                        ipAddress = address.getHostAddress();
+                    }
+                }
+            }
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+        if (ipAddress == null) {
+            System.out.println("[HOST] Cannot obtain local host ip address.");
+        }
+        return ipAddress;
+    }
+}

src/main/java/seng302/gameServer/ServerDescription.java

@@ -0,0 +1,73 @@
+package seng302.gameServer;
+
+public class ServerDescription {
+    private String address;
+    private Integer portNum;
+    private String serverName;
+    private String mapName;
+    private Integer spacesLeft;
+
+    public ServerDescription(String serverName, String mapName, Integer spacesLeft, String address, Integer portNum){
+        this.serverName = serverName;
+        this.mapName = mapName;
+        this.spacesLeft = spacesLeft;
+        this.address = address;
+        this.portNum = portNum;
+    }
+
+
+    public String getName() {
+        return serverName;
+    }
+
+    public String getMapName() {
+        return mapName;
+    }
+
+    public Integer portNumber() {
+        return portNum;
+    }
+
+    public String getAddress(){
+        return address;
+    }
+
+    public Integer spacesLeft() {
+        return spacesLeft;
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (obj == null) {
+            return false;
+        }
+        if (!ServerDescription.class.isAssignableFrom(obj.getClass())) {
+            return false;
+        }
+        final ServerDescription other = (ServerDescription) obj;
+
+        if (!this.getAddress().equals(other.getAddress()) ) {
+            return false;
+        }
+
+        if (!this.portNumber().equals(other.portNumber())){
+            return false;
+        }
+
+        if (!this.getMapName().equals(other.getMapName())){
+            return false;
+        }
+
+        if (!this.getName().equals(other.getName())){
+            return false;
+        }
+
+        return true;
+    }
+
+    @Override
+    public int hashCode() {
+        return this.getName().hashCode() + this.getAddress().hashCode() +
+                this.portNumber().hashCode() + this.getMapName().hashCode();
+    }
+}

src/main/java/seng302/gameServer/ServerToClientThread.java

@@ -1,59 +1,24 @@
 package seng302.gameServer;
 
 
-import java.io.BufferedReader;
-import java.io.ByteArrayOutputStream;
-import java.io.IOException;
-import java.io.InputStream;
-import java.io.InputStreamReader;
-import java.io.OutputStream;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import seng302.gameServer.messages.*;
+import seng302.model.Player;
+import seng302.model.ServerYacht;
+import seng302.model.stream.packets.PacketType;
+import seng302.model.stream.packets.StreamPacket;
+import seng302.model.stream.xml.generator.Race;
+import seng302.utilities.XMLGenerator;
+
+import java.io.*;
 import java.net.Socket;
 import java.net.SocketException;
-import java.util.ArrayList;
-import java.util.Arrays;
-import java.util.List;
-import java.util.Observable;
-import java.util.Observer;
+import java.util.*;
 import java.util.concurrent.ThreadLocalRandom;
 import java.util.stream.Collectors;
 import java.util.zip.CRC32;
 import java.util.zip.Checksum;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
-import seng302.gameServer.messages.BoatAction;
-import seng302.gameServer.messages.BoatLocationMessage;
-import seng302.gameServer.messages.ClientType;
-import seng302.gameServer.messages.CustomizeRequestType;
-import seng302.gameServer.messages.Message;
-import seng302.gameServer.messages.RegistrationResponseMessage;
-import seng302.gameServer.messages.RegistrationResponseStatus;
-import seng302.gameServer.messages.XMLMessage;
-import seng302.gameServer.messages.XMLMessageSubType;
-import seng302.gameServer.messages.YachtEventCodeMessage;
-import seng302.gameServer.messages.YachtEventCodeMessage;
-import seng302.model.Player;
-import seng302.model.ServerYacht;
-import seng302.model.stream.packets.PacketType;
-import seng302.model.stream.packets.StreamPacket;
-import seng302.model.stream.xml.generator.Race;
-import seng302.model.stream.xml.generator.Regatta;
-import seng302.utilities.XMLGenerator;
-import seng302.gameServer.messages.BoatAction;
-import seng302.gameServer.messages.BoatLocationMessage;
-import seng302.gameServer.messages.ClientType;
-import seng302.gameServer.messages.Message;
-import seng302.gameServer.messages.RegistrationResponseMessage;
-import seng302.gameServer.messages.RegistrationResponseStatus;
-import seng302.gameServer.messages.XMLMessage;
-import seng302.gameServer.messages.XMLMessageSubType;
-import seng302.gameServer.messages.YachtEventCodeMessage;
-import seng302.model.Player;
-import seng302.model.ServerYacht;
-import seng302.model.stream.packets.PacketType;
-import seng302.model.stream.packets.StreamPacket;
-import seng302.model.stream.xml.generator.Race;
-import seng302.model.stream.xml.generator.Regatta;
-import seng302.utilities.XMLGenerator;
 
 /**
  * A class describing a single connection to a Client for the purposes of sending and receiving on
@@ -258,12 +223,6 @@ public class ServerToClientThread implements Runnable, Observer {
             race.addBoat(yacht);
         }
 
-        //@TODO calculate lat/lng values
-        xml.setRegatta(
-            new Regatta(
-                "Party Parrot Test Server", "Bermuda Test Course",
-                57.6679590, 11.8503233)
-        );
         xml.setRace(race);
 
         XMLMessage xmlMessage;

src/main/java/seng302/gameServer/messages/MarkRoundingMessage.java

@@ -22,6 +22,7 @@ public class MarkRoundingMessage extends Message{
      * @param roundingBoatStatus roundingBoatStatus
      * @param roundingSide roundingSide
      * @param markId markId
+     * @param markType .
      */
     public MarkRoundingMessage(int ackNumber, int raceId, int sourceId, RoundingBoatStatus roundingBoatStatus,
         RoundingSide roundingSide, MarkType markType, int markId) {

src/main/java/seng302/model/ServerYacht.java

@@ -1,8 +1,5 @@
 package seng302.model;
 
-import java.util.HashMap;
-import java.util.Observable;
-import java.util.Observer;
 import javafx.scene.paint.Color;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
@@ -11,6 +8,10 @@ import seng302.gameServer.messages.BoatStatus;
 import seng302.model.mark.Mark;
 import seng302.utilities.GeoUtility;
 
+import java.util.HashMap;
+import java.util.Observable;
+import java.util.Observer;
+
 /**
  * Yacht class for the racing boat. <p> Class created to store more variables (eg. boat statuses)
  * compared to the XMLParser boat class, also done outside Boat class because some old variables are
@@ -123,6 +124,7 @@ public class ServerYacht extends Observable {
 
     /**
      * Swaps the boats direction from one side of the wind to the other.
+     * @param windDirection .
      */
     public void tackGybe(Double windDirection) {
         if (isAuto) {

src/main/java/seng302/utilities/XMLGenerator.java

@@ -3,13 +3,15 @@ package seng302.utilities;
 import freemarker.template.Configuration;
 import freemarker.template.Template;
 import freemarker.template.TemplateException;
+import seng302.gameServer.messages.XMLMessageSubType;
+import seng302.model.stream.xml.generator.Race;
+import seng302.model.stream.xml.generator.Regatta;
+
 import java.io.ByteArrayOutputStream;
 import java.io.IOException;
 import java.io.OutputStreamWriter;
 import java.io.UnsupportedEncodingException;
-import seng302.model.stream.xml.generator.Race;
-import seng302.model.stream.xml.generator.Regatta;
-import seng302.gameServer.messages.XMLMessageSubType;
+import java.util.Random;
 
 /**
  * An XML generator to generate the Race, Boat, and Regatta XML dynamically
@@ -20,9 +22,14 @@ public class XMLGenerator {
     private static final String BOATS_TEMPLATE_NAME = "boats.ftlh";
     private static final String RACE_TEMPLATE_NAME = "race.ftlh";
     private Configuration configuration;
-    private Regatta regatta;
+    private Regatta regatta = null;
     private Race race;
 
+    public static Regatta DEFAULT_REGATTA = new Regatta("Party Parrot Test Server " + new Random().nextInt(100),
+            "Bermuda Test Course",
+            57.6679590,
+            11.8503233);
+
     /**
      * Set up a configuration instance for Apache Freemake
      */
@@ -106,7 +113,7 @@ public class XMLGenerator {
     public String getRegattaAsXml(){
         String result = null;
 
-        if (regatta == null) return null;
+        if (regatta == null) regatta = DEFAULT_REGATTA;
 
         try {
             result = parseToXmlString(REGATTA_TEMPLATE_NAME, XMLMessageSubType.REGATTA);

src/main/java/seng302/visualiser/GameClient.java

@@ -142,6 +142,7 @@ public class GameClient {
     }
 
     private void loadStartScreen() {
+
         socketThread.setSocketToClose();
         if (server != null) {
             server.terminate();

src/main/java/seng302/visualiser/ServerListener.java

@@ -0,0 +1,113 @@
+package seng302.visualiser;
+
+import seng302.gameServer.ServerAdvertiser;
+import seng302.gameServer.ServerDescription;
+
+import javax.jmdns.JmDNS;
+import javax.jmdns.ServiceEvent;
+import javax.jmdns.ServiceListener;
+import java.io.IOException;
+import java.net.InetAddress;
+import java.util.ArrayList;
+import java.util.HashSet;
+import java.util.Set;
+
+import static seng302.gameServer.ServerAdvertiser.getLocalHostIp;
+
+/**
+ * Listens for servers on the local network
+ */
+public class ServerListener{
+    private static ServerListener instance;
+    private ServerListenerDelegate delegate;
+    private JmDNS jmdns = null;
+    GameServeMonitor listener;
+
+    private class GameServeMonitor implements ServiceListener {
+        private Set<ServerDescription> servers;
+
+        GameServeMonitor(){
+            servers = new HashSet<>();
+        }
+
+        /**
+         * A Service has been detected but not resolved
+         * @param event The ServiceEvent
+         */
+        @Override
+        public void serviceAdded(ServiceEvent event) {
+        }
+
+        /**
+         * A Service has been removed / unregistered
+         * @param event The ServiceEvent
+         */
+        @Override
+        public void serviceRemoved(ServiceEvent event) {
+            String serverName = event.getInfo().getName();
+
+            ServerDescription toRemove = null;
+
+            for (ServerDescription server : servers){
+                if (server.getName().equals(serverName)){
+                    toRemove = server;
+                }
+            }
+
+            if (toRemove != null){
+                servers.remove(toRemove);
+            }
+
+            delegate.serverRemoved(new ArrayList<ServerDescription>(servers));
+
+            // Get all other servers with the same name to respond if they are up
+            jmdns.requestServiceInfo(ServerAdvertiser.SERVICE_TYPE, serverName);
+
+        }
+
+        /**
+         * A Service has been added and resolved
+         * @param event The ServiceEvent
+         */
+        @Override
+        public void serviceResolved(ServiceEvent event) {
+            String address = event.getInfo().getServer();
+            Integer portNum = event.getInfo().getPort();
+
+            String serverName = event.getInfo().getName();
+            String mapName = event.getInfo().getPropertyString("map");
+            Integer spacesLeft = Integer.parseInt(event.getInfo().getPropertyString("spacesLeft"));
+
+            ServerDescription serverDescription = new ServerDescription(serverName, mapName, spacesLeft, address, portNum);
+
+            servers.remove(serverDescription);
+            servers.add(serverDescription);
+
+            delegate.serverDetected(serverDescription, new ArrayList<ServerDescription>(servers));
+        }
+    }
+
+    private ServerListener() throws IOException {
+        jmdns = JmDNS.create(InetAddress.getByName(getLocalHostIp()));
+        listener = new GameServeMonitor();
+        jmdns.addServiceListener(ServerAdvertiser.SERVICE_TYPE, listener);
+    }
+
+    public static ServerListener getInstance() throws IOException {
+        if (instance == null){
+            instance = new ServerListener();
+        }
+
+        return instance;
+    }
+
+    /**
+     * Set the delegate to handle events
+     * @param delegate .
+     */
+    public void setDelegate(ServerListenerDelegate delegate){
+        this.delegate = delegate;
+    }
+
+
+}

src/main/java/seng302/visualiser/ServerListenerDelegate.java

@@ -0,0 +1,10 @@
+package seng302.visualiser;
+
+import seng302.gameServer.ServerDescription;
+
+import java.util.List;
+
+public interface ServerListenerDelegate {
+    void serverRemoved(List<ServerDescription> currentServers);
+    void serverDetected(ServerDescription serverDescription, List<ServerDescription> servers);
+}

src/main/java/seng302/visualiser/controllers/StartScreenController.java

@@ -5,6 +5,7 @@ import com.jfoenix.controls.JFXButton;
 import java.io.IOException;
 import java.net.URL;
 import java.util.ResourceBundle;
+import javafx.application.Platform;
 import javafx.fxml.FXML;
 import javafx.fxml.FXMLLoader;
 import javafx.fxml.Initializable;
@@ -14,6 +15,26 @@ import javafx.scene.effect.DropShadow;
 import javafx.scene.paint.Color;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
+import javafx.scene.control.Alert;
+import javafx.scene.control.Button;
+import javafx.scene.control.ListView;
+import javafx.scene.control.TextField;
+import javafx.scene.layout.AnchorPane;
+import javafx.scene.layout.GridPane;
+import seng302.gameServer.ServerAdvertiser;
+import seng302.gameServer.ServerDescription;
+import seng302.visualiser.GameClient;
+import seng302.visualiser.ServerListener;
+import seng302.visualiser.ServerListenerDelegate;
+
+import java.io.IOException;
+import java.net.Inet4Address;
+import java.net.InetAddress;
+import java.net.NetworkInterface;
+import java.net.URL;
+import java.util.Enumeration;
+import java.util.List;
+import java.util.ResourceBundle;
 
 public class StartScreenController implements Initializable {
 
@@ -26,6 +47,38 @@ public class StartScreenController implements Initializable {
     private Node serverList;
 
     private Logger logger = LoggerFactory.getLogger(StartScreenController.class);
+    public void initialize(URL url,  ResourceBundle resourceBundle) {
+//        gameClient = new GameClient(holder);
+
+        try {
+            ServerListener.getInstance().setDelegate(this);
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+
+        joinLobbyButton.setOnAction(event -> joinLobbyClicked());
+    }
+//
+//    /**
+//     * Loads the fxml content into the parent pane
+//     * @param jfxUrl
+//     * @return the controller of the fxml
+//     */
+//    private Object setContentPane(String jfxUrl) {
+//        try {
+//            AnchorPane contentPane = (AnchorPane) startScreen2.getParent();
+//            contentPane.getChildren().removeAll();
+//            contentPane.getChildren().clear();
+//            contentPane.getStylesheets().add(getClass().getResource("/css/master.css").toString());
+//            FXMLLoader fxmlLoader = new FXMLLoader(getClass().getResource(jfxUrl));
+//            contentPane.getChildren().addAll((Pane) fxmlLoader.load());
+//
+//            return fxmlLoader.getController();
+//        } catch (IOException e) {
+//            e.printStackTrace();
+//        }
+//        return null;
+//    }
 
     private void setInitialDropShadow(){
         DropShadow dropShadow = new DropShadow();

src/main/java/seng302/visualiser/fxObjects/BoatObject.java

@@ -1,7 +1,5 @@
 package seng302.visualiser.fxObjects;
 
-import java.util.ArrayList;
-import java.util.List;
 import javafx.application.Platform;
 import javafx.geometry.Point2D;
 import javafx.scene.Group;
@@ -14,6 +12,9 @@ import javafx.scene.shape.Polyline;
 import javafx.scene.shape.StrokeLineCap;
 import javafx.scene.transform.Rotate;
 
+import java.util.ArrayList;
+import java.util.List;
+
 /**
  * BoatGroup is a javafx group that by default contains a graphical objects for representing a 2
  * dimensional boat. It contains a single polygon for the boat, a group of lines to show it's path,
@@ -130,6 +131,7 @@ public class BoatObject extends Group {
      * @param rotation The rotation by which the boat moves
      * @param velocity The velocity the boat is moving
      * @param sailIn Boolean to toggle sail state.
+     * @param windDir .
      */
     public void moveTo(double x, double y, double rotation, double velocity, Boolean sailIn, double windDir) {
         Double dx = Math.abs(boatPoly.getLayoutX() - x);