Working on putting all protocol messages through Protocol.java.

Some small adjustments & bugfixes to how naming is handled.
Added loggedIn boolean for ClientHandler, not meaningfully implemented yet though.
Other minor changes.

src/main/java/ch/unibas/dmi/dbis/cs108/multiplayer/client/Client.java

@@ -4,6 +4,7 @@ import ch.unibas.dmi.dbis.cs108.BudaLogConfig;
 import ch.unibas.dmi.dbis.cs108.multiplayer.helpers.ClientPinger;
 
 
+import ch.unibas.dmi.dbis.cs108.multiplayer.helpers.Protocol;
 import java.net.Socket;
 import java.io.*;
 import java.net.UnknownHostException;
@@ -36,7 +37,7 @@ public class Client {
         systemName = "U.N. Owen";
       }
       if (systemName == null) systemName = "U.N. Owen";
-      sendMsgToServer("LOGON$" + systemName);
+      sendMsgToServer(Protocol.clientLogin + "$" + systemName);
 
       clientPinger = new ClientPinger(this, this.socket);
     } catch (IOException e) {

src/main/java/ch/unibas/dmi/dbis/cs108/multiplayer/client/MessageFormatter.java

@@ -1,6 +1,7 @@
 package ch.unibas.dmi.dbis.cs108.multiplayer.client;
 
 import ch.unibas.dmi.dbis.cs108.BudaLogConfig;
+import ch.unibas.dmi.dbis.cs108.multiplayer.helpers.Protocol;
 import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
 
@@ -10,7 +11,7 @@ public class MessageFormatter {
 
   /**
    * Takes a given Message and reformats it to where the JServerProtocolParser.parse() method can
-   * handle it (see Protocol.txt). May need to be redesigned once the games uses a GUI
+   * handle it (see Protocol.java). May need to be redesigned once the games uses a GUI
    *
    * @param msg the Messaged to be reformatted
    * @return the reformatted message in the form HEADR$msg
@@ -27,7 +28,7 @@ public class MessageFormatter {
     }
     switch (header) {
       case "/c":
-        stringBuilder.append("CHATA$");
+        stringBuilder.append(Protocol.chatMsgToAll + "$");
         try {
           s = msg.substring(3);
         } catch (Exception e) {
@@ -35,15 +36,15 @@ public class MessageFormatter {
         }
         break;
       case "/q":
-        stringBuilder.append("QUITS$");
+        stringBuilder.append(Protocol.clientQuitRequest + "$");
         s = "";
         break;
       case "/n":
-        stringBuilder.append("NAMEC$");
+        stringBuilder.append(Protocol.nameChange + "$");
         try {
           s = msg.substring(3);
         } catch (Exception e) {
-          System.out.println("Well what do you want your name to be?");
+          s = "U.N. Owen";
         }
         break;
       default:

src/main/java/ch/unibas/dmi/dbis/cs108/multiplayer/helpers/Protocol.java

@@ -0,0 +1,66 @@
+package ch.unibas.dmi.dbis.cs108.multiplayer.helpers;
+
+/**
+ * This class is where the Protocol commands are saved as strings.
+ * The idea is that every class that uses protocol messages does not
+ * directly use e.g. "CHATA" in the code but rather uses
+ * Protocol.chatMsgToAll. This improves legibility as well as
+ * allowing for quick modification of Protocol messages if needed.
+ * Most importantly, the Protocol commands can be documented in this
+ * class, and then in every other class that uses protocol messages,
+ * documentation for a command can be viewed by hovering over the
+ * specific variable, rather than having to document everywhere.
+ */
+public class Protocol {
+
+  //BIDIRECTIONAL COMMANDS:
+
+  /**
+   * Ping-back message from client to server / server to client.
+   * To be sent upon receiving "CPING" / "SPING".
+   * The other party then registers this in its ClientPinger / ServerPinger
+   * thread.
+   */
+  public static final String pingBack = "PINGB";
+
+
+  //CLIENT TO SERVER COMMANDS:
+
+  /**
+   * When the server receives this, it broadcasts a chat message
+   * to all clients. The message has to be given in the protocol
+   * message after {@code CHATA$}, for example the protocol message
+   * {@code CHATA$Hello everybody!}, if sent from the user named Poirot,
+   * will print {@code Poirot: Hello everybody!} to every connected
+   * client's chat console (note the absence / presence of spaces).
+   */
+  public static final String chatMsgToAll = "CHATA";
+
+  /**
+   * The message sent by the client on login to set their name. For example,
+   * {@code LOGIN$Poirot} will use the clientHandler.setUsernameOnLogin() method
+   * to set this client's username to Poirot, and broadcast the announcement:
+   * {@code "Poirot has joined the Server"}. Also, it will set this clientHandler's
+   * loggedIn boolean to true, which could be used later to refuse access to users
+   * who haven't formally logged in using this command => //todo: shun non-logged-in users
+   *
+   */
+  public static final String clientLogin = "LOGIN";
+
+  /**
+   * todo:doc
+   *
+   */
+  public static final String nameChange = "NAMEC";
+
+  /**
+   * todo:doc
+   */
+  public static final String pingFromClient = "CPING";
+
+  /**
+   * todo: doc
+   */
+  public static final String clientQuitRequest = "QUITS";
+
+}

src/main/java/ch/unibas/dmi/dbis/cs108/multiplayer/server/ClientHandler.java

@@ -19,8 +19,15 @@ public class ClientHandler implements Runnable {
   private BufferedReader in;
   private Socket socket;
   private InetAddress ip;
-  private
+
-  Scanner sc;
+  /**
+   * notes if the client has formally logged in yet. If connecting through the normal Client class,
+   * the client is logged in automatically, if connecting though some external application, the
+   * client has to use the {@code Protocol.clientLogin} command.
+   */
+  private boolean loggedIn;
+
+  private Scanner sc;
   public ServerPinger serverPinger;
   public static HashSet<ClientHandler> connectedClients = new HashSet<>();
   public static HashSet<ClientHandler> disconnectedClients = new HashSet<>(); //todo: implement re-connection
@@ -38,6 +45,7 @@ public class ClientHandler implements Runnable {
       this.socket = socket;
       this.out = new BufferedWriter(new OutputStreamWriter(socket.getOutputStream()));
       this.in = new BufferedReader(new InputStreamReader((socket.getInputStream())));
+      this.loggedIn = false;
       this.clientUserName = nameDuplicateChecker.checkName("U.N. Owen");
       connectedClients.add(this);
       serverPinger = new ServerPinger(socket, this);
@@ -73,7 +81,18 @@ public class ClientHandler implements Runnable {
     return ghostClients;
   }
 
-  //Setters
+  public boolean isLoggedIn() {
+    return loggedIn;
+  }
+
+  public void setLoggedIn(boolean loggedIn) {
+    this.loggedIn = loggedIn;
+  }
+
+  //Setters:
+  public String getClientUserName() {
+    return clientUserName;
+  }
 
 
   @Override
@@ -81,7 +100,7 @@ public class ClientHandler implements Runnable {
     String msg;
     while (socket.isConnected() && !socket.isClosed()) {
       try {
-        msg = in.readLine();      //todo: here is where the server throws an exception when the client quits
+        msg = in.readLine();
         JServerProtocolParser.parse(msg, this);
       } catch (IOException e) {
         //e.printStackTrace();
@@ -92,9 +111,7 @@ public class ClientHandler implements Runnable {
     }
   }
 
-  public String getClientUserName() {
+
-    return clientUserName;
-  }
 
   /**
    * Lets the client change their username, if the username is already taken, a similar
@@ -148,12 +165,10 @@ public class ClientHandler implements Runnable {
 
   /** Sends a given message to client. The message has to already be protocol-formatted. ALL
    * communication with the client has to happen via this method!
-   * todo: check for exception if out is closed.
    * @param msg the given message. Should already be protocol-formatted.
    */
   public void sendMsgToClient(String msg) {
     try {
-      //todo: socket closed handling
       out.write(msg);
       out.newLine();
       out.flush();

src/main/java/ch/unibas/dmi/dbis/cs108/multiplayer/server/JServerProtocolParser.java

@@ -4,6 +4,7 @@ package ch.unibas.dmi.dbis.cs108.multiplayer.server;
 import ch.unibas.dmi.dbis.cs108.BudaLogConfig;
 import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
+import ch.unibas.dmi.dbis.cs108.multiplayer.helpers.Protocol;
 
 public class JServerProtocolParser {
   public static final Logger LOGGER = LogManager.getLogger();
@@ -17,6 +18,9 @@ public class JServerProtocolParser {
 
   /**
    * Used by the server (i.e. ClientHandler) to parse an incoming protocol message.
+   * For documentation on the individual Protocol messages, view the Protocol.java
+   * class or hover over the commands (e.g. Protocol.chatMsgToAll) with your mouse
+   * in this class.
    *
    * @param msg the encoded message that needs to be parsed
    * @param h   this ClientHandler (required so this method can access the ClientHandler's methods)
@@ -30,33 +34,27 @@ public class JServerProtocolParser {
       System.out.println("Received unknown command");
     }
     switch (header) {
-      case CHATA:
+      case Protocol.chatMsgToAll:
-        //sends chat message to all connected clients
         h.broadcastChatMessage(msg.substring(6));
         break;
-      case "LOGON":
+      case Protocol.clientLogin:
-        //sets name to whatever follows LOGON$
+        h.setLoggedIn(true);
         try {
           h.setUsernameOnLogin(msg.substring(6));
         } catch (Exception e) {
           h.setUsernameOnLogin("U.N. Owen");
         }
         break;
-      case "NAMEC":
+      case Protocol.nameChange:
-        //changes name to whatever follows NAMEC$. If the new name is already in use, it will append
-        //random numbers to the name.
         h.changeUsername(msg.substring(6));
         break;
-      case "CPING":
+      case Protocol.pingFromClient:
-        //sends a pingback to the client
+        h.sendMsgToClient(Protocol.pingBack);
-        h.sendMsgToClient("PINGB");
         break;
-      case "PINGB":
+      case Protocol.pingBack:
-        //registers pingback from client
         h.serverPinger.setGotPingBack(true);
         break;
-      case "QUITS":
+      case Protocol.clientQuitRequest:
-        //safely disconnects the user
         h.removeClientOnLogout();
         break;
       default:

src/main/java/ch/unibas/dmi/dbis/cs108/multiplayer/server/nameDuplicateChecker.java

@@ -54,13 +54,14 @@ public class nameDuplicateChecker {
    * Also, if the name is empty, it assigns a default value ("U.N. Owen").
    */
   public static String checkName(String name) {
-    String rtrn = name;                 //if this line is used, only duplicate names get a suffix.
+    String tempname = name;                 //if this line is used, only duplicate names get a suffix.
-    //String rtrn = extendName(name);     //if this line is used, all clients get a suffix
+    //String tempname = extendName(name);     //if this line is used, all clients get a suffix
-    rtrn = rtrn.replace("$","");
+    tempname = tempname.replace("$","");
-    rtrn = rtrn.replace(":","");
+    tempname = tempname.replace(":","");
-    if (rtrn.equalsIgnoreCase("")) {rtrn = "U.N. Owen";}
+    if (tempname.equalsIgnoreCase("")) {tempname = "U.N. Owen";}
+    String rtrn = tempname;
     while (isTaken(rtrn)) {        //todo: handle the (very unlikely) case that all names are taken.
-      rtrn = extendName(name);
+      rtrn = extendName(tempname);
     }
     return rtrn;
   }