Added the ability to ping any server (online status, motd, max players)

+ smaller tweaks.

HolographicDisplays/Plugin/com/gmail/filoghost/holographicdisplays/HolographicDisplays.java

@@ -38,6 +38,9 @@ public class HolographicDisplays extends JavaPlugin {
 	// Since 1.8 we use armor stands instead of wither skulls.
 	private static boolean is1_8;
 	
+	// Used for the server pinger.
+	private static boolean isPreNetty;
+	
 	// True if ProtocolLib is installed and successfully loaded.
 	private static boolean useProtocolLib;
 	
@@ -83,6 +86,7 @@ public class HolographicDisplays extends JavaPlugin {
 			
 			if ("1.6.4".equals(version)) {
 				version = "v1_6_R3";
+				isPreNetty = true;
 			} else if ("1.7.2".equals(version)) {
 				version = "v1_7_R1";
 			} else if ("1.7.5".equals(version)) {
@@ -222,6 +226,10 @@ public class HolographicDisplays extends JavaPlugin {
 		return is1_8;
 	}
 	
+	public static boolean isPreNetty() {
+		return isPreNetty;
+	}
+	
 	private static void printWarnAndDisable(String... messages) {
 		StringBuffer buffer = new StringBuffer("\n ");
 		for (String message : messages) {

HolographicDisplays/Plugin/com/gmail/filoghost/holographicdisplays/bridge/bungeecord/BungeeChannel.java

@@ -50,7 +50,9 @@ public class BungeeChannel implements PluginMessageListener {
 				 
 				 if (in.available() > 0) {
 					 int online = in.readInt();
-					 BungeeServerTracker.handlePing(server, online);
+					 
+					 BungeeServerInfo serverInfo = BungeeServerTracker.getOrCreateServerInfo(server);
+					 serverInfo.setOnlinePlayers(online);
 				 }
 			 }
 		 

HolographicDisplays/Plugin/com/gmail/filoghost/holographicdisplays/bridge/bungeecord/BungeeServerInfo.java

@@ -2,12 +2,24 @@ package com.gmail.filoghost.holographicdisplays.bridge.bungeecord;
 
 public class BungeeServerInfo {
 
+	private boolean isOnline;
 	private int onlinePlayers;
+	private int maxPlayers;
+	private String motd; // Should never be null
 	private long lastRequest;
 
-	protected BungeeServerInfo(int onlinePlayers, long lastRequest) {
-		this.onlinePlayers = onlinePlayers;
-		this.lastRequest = lastRequest;
+	protected BungeeServerInfo() {
+		isOnline = true;
+		this.motd = "";
+		updateLastRequest();
+	}
+	
+	public boolean isOnline() {
+		return isOnline;
+	}
+
+	public void setOnline(boolean isOnline) {
+		this.isOnline = isOnline;
 	}
 
 	public int getOnlinePlayers() {
@@ -18,12 +30,32 @@ public class BungeeServerInfo {
 		this.onlinePlayers = onlinePlayers;
 	}
 	
+	public int getMaxPlayers() {
+		return maxPlayers;
+	}
+
+	public void setMaxPlayers(int maxPlayers) {
+		this.maxPlayers = maxPlayers;
+	}
+
+	public String getMotd() {
+		return motd;
+	}
+
+	public void setMotd(String motd) {
+		if (motd == null) {
+			motd = "";
+		}
+		
+		this.motd = motd;
+	}
+
 	public long getLastRequest() {
 		return lastRequest;
 	}
 
-	public void setLastRequest(long lastRequest) {
-		this.lastRequest = lastRequest;
+	public void updateLastRequest() {
+		this.lastRequest = System.currentTimeMillis();
 	}
 
 }

HolographicDisplays/Plugin/com/gmail/filoghost/holographicdisplays/bridge/bungeecord/BungeeServerTracker.java

@@ -1,53 +1,118 @@
 package com.gmail.filoghost.holographicdisplays.bridge.bungeecord;
 
-import java.util.HashMap;
+import java.io.IOException;
+import java.net.SocketTimeoutException;
+import java.net.UnknownHostException;
 import java.util.Map;
+import java.util.Map.Entry;
+import java.util.concurrent.ConcurrentHashMap;
 
 import org.bukkit.Bukkit;
+import org.bukkit.scheduler.BukkitRunnable;
 
 import com.gmail.filoghost.holographicdisplays.HolographicDisplays;
+import com.gmail.filoghost.holographicdisplays.bridge.bungeecord.serverpinger.ServerAddress;
+import com.gmail.filoghost.holographicdisplays.bridge.bungeecord.serverpinger.ServerPinger;
+import com.gmail.filoghost.holographicdisplays.bridge.bungeecord.serverpinger.ServerStatus;
+import com.gmail.filoghost.holographicdisplays.disk.Configuration;
+import com.gmail.filoghost.holographicdisplays.util.DebugHandler;
 
 public class BungeeServerTracker {
 	
-	private static Map<String, BungeeServerInfo> trackedServers = new HashMap<String, BungeeServerInfo>();
+	private static Map<String, BungeeServerInfo> trackedServers = new ConcurrentHashMap<String, BungeeServerInfo>();
 	private static int taskID = -1;
 	
+	private static ServerPinger pinger = HolographicDisplays.isPreNetty() ? ServerPinger.PRE_NETTY_REWRITE : ServerPinger.POST_NETTY_REWRITE;
+
 	public static void resetTrackedServers() {
 		trackedServers.clear();
 	}
 	
 	public static void track(String server) {
 		if (!trackedServers.containsKey(server)) {
-			BungeeServerInfo info = new BungeeServerInfo(0, System.currentTimeMillis());
+			BungeeServerInfo info = new BungeeServerInfo();
 			trackedServers.put(server, info);
+			
+			if (!Configuration.pingerEnable) {
 				BungeeChannel.getInstance().askPlayerCount(server);
 			}
 		}
+	}
 	
 	public static void untrack(String server) {
 		trackedServers.remove(server);
 	}
 	
-	// Handle a successful ping.
-	protected static void handlePing(String server, int online) {
+	protected static BungeeServerInfo getOrCreateServerInfo(String server) {
 		BungeeServerInfo info = trackedServers.get(server);
 		if (info == null) {
-			info = new BungeeServerInfo(online, System.currentTimeMillis());
+			info = new BungeeServerInfo();
 			trackedServers.put(server, info);
-		} else {
-			info.setOnlinePlayers(online);
-		}
 		}
 		
-	public static int getPlayersOnline(String server) {
+		return info;
+	}
+
+	public static String getPlayersOnline(String server) {
 		BungeeServerInfo info = trackedServers.get(server);
 		if (info != null) {
-			info.setLastRequest(System.currentTimeMillis());
-			return info.getOnlinePlayers();
+			info.updateLastRequest();
+			return String.valueOf(info.getOnlinePlayers());
 		} else {
 			// It was not tracked, add it.
 			track(server);
-			return 0;
+			return "[Loading...]";
+		}
+	}
+	
+	public static String getMaxPlayers(String server) {
+		
+		if (!Configuration.pingerEnable) {
+			return "[Please enable pinger]";
+		}
+		
+		BungeeServerInfo info = trackedServers.get(server);
+		if (info != null) {
+			info.updateLastRequest();
+			return String.valueOf(info.getMaxPlayers());
+		} else {
+			// It was not tracked, add it.
+			track(server);
+			return "[Loading...]";
+		}
+	}
+	
+	public static String getMotd(String server) {
+		
+		if (!Configuration.pingerEnable) {
+			return "[Please enable pinger]";
+		}
+		
+		BungeeServerInfo info = trackedServers.get(server);
+		if (info != null) {
+			info.updateLastRequest();
+			return info.getMotd();
+		} else {
+			// It was not tracked, add it.
+			track(server);
+			return "[Loading...]";
+		}
+	}
+	
+	public static String getOnlineStatus(String server) {
+		
+		if (!Configuration.pingerEnable) {
+			return "[Please enable pinger]";
+		}
+		
+		BungeeServerInfo info = trackedServers.get(server);
+		if (info != null) {
+			info.updateLastRequest();
+			return info.isOnline() ? Configuration.pingerStatusOnline : Configuration.pingerStatusOffline;
+		} else {
+			// It was not tracked, add it.
+			track(server);
+			return "[Loading...]";
 		}
 	}
 
@@ -62,11 +127,60 @@ public class BungeeServerTracker {
 		}
 		
 		taskID = Bukkit.getScheduler().scheduleSyncRepeatingTask(HolographicDisplays.getInstance(), new Runnable() {
+			
+			@Override
 			public void run() {
+				
+				if (Configuration.pingerEnable) {
+					new BukkitRunnable() {
+						
+						@Override
+						public void run() {
+							for (Entry<String, ServerAddress> entry : Configuration.pingerServers.entrySet()) {
+								
+								BungeeServerInfo serverInfo = getOrCreateServerInfo(entry.getKey());
+								boolean displayOffline = false;
+								
+								try {
+									ServerStatus data = pinger.fetchData(entry.getValue(), Configuration.pingerTimeout);
+									if (data.isOnline()) {
+										serverInfo.setOnline(true);
+										serverInfo.setOnlinePlayers(data.getOnlinePlayers());
+										serverInfo.setMaxPlayers(data.getMaxPlayers());
+										serverInfo.setMotd(data.getMotd());
+									} else {
+										displayOffline = true;
+									}
+								} catch (SocketTimeoutException e) {
+									displayOffline = true;
+								} catch (UnknownHostException e) {
+									HolographicDisplays.getInstance().getLogger().warning("Couldn't fetch data from " + entry.getKey() + "(" + entry.getValue().toString() + "): unknown host address.");
+									displayOffline = true;
+								} catch (IOException e) {
+									displayOffline = true;
+								} catch (Exception e) {
+									displayOffline = true;
+									HolographicDisplays.getInstance().getLogger().warning("Couldn't fetch data from " + entry.getKey() + "(" + entry.getValue().toString() + "), unhandled exception: " + e.toString());
+									DebugHandler.handleDebugException(e);
+								}
+								
+								if (displayOffline) {
+									serverInfo.setOnline(false);
+									serverInfo.setOnlinePlayers(0);
+									serverInfo.setMaxPlayers(0);
+									serverInfo.setMotd(Configuration.pingerOfflineMotd);
+								}
+							}
+						}
+					}.runTaskAsynchronously(HolographicDisplays.getInstance());
+					
+				} else {
 					for (String server : trackedServers.keySet()) {
 						BungeeChannel.getInstance().askPlayerCount(server);
 					}
 				}
+				
+			}
 		}, 0, refreshSeconds * 20);
 	}
 }

HolographicDisplays/Plugin/com/gmail/filoghost/holographicdisplays/bridge/bungeecord/serverpinger/PacketUtils.java

@@ -0,0 +1,67 @@
+package com.gmail.filoghost.holographicdisplays.bridge.bungeecord.serverpinger;
+
+import java.lang.RuntimeException;
+import java.io.Closeable;
+import java.io.DataInputStream;
+import java.io.IOException;
+import java.lang.Character;
+import java.lang.String;
+import java.io.DataOutputStream;
+import java.nio.charset.Charset;
+
+class PacketUtils
+{
+    public static final Charset UTF16BE = Charset.forName("UTF-16BE");;
+    public static final Charset UTF8 = Charset.forName("UTF-8");
+    
+    public static void a(final DataOutputStream out, final String s) throws IOException {
+        final int len = s.length();
+        final byte[] data = new byte[len / 2];
+        for (int i = 0; i < len; i += 2) {
+            data[i / 2] = (byte)((Character.digit(s.charAt(i), 16) << 4) + Character.digit(s.charAt(i + 1), 16));
+        }
+        out.write(data);
+    }
+    
+    public static void writeString(final DataOutputStream out, final String s, final Charset charset) throws IOException {
+        if (charset == PacketUtils.UTF8) {
+            writeVarInt(out, s.length());
+        }
+        else {
+            out.writeShort(s.length());
+        }
+        out.write(s.getBytes(charset));
+    }
+    
+    public static int readVarInt(final DataInputStream in) throws IOException {
+        int i = 0;
+        int j = 0;
+        while (true) {
+            final int k = in.readByte();
+            i |= (k & 0x7F) << j++ * 7;
+            if (j > 5) {
+                throw new RuntimeException("VarInt too big");
+            }
+            if ((k & 0x80) != 0x80) {
+                return i;
+            }
+        }
+    }
+    
+    public static void writeVarInt(final DataOutputStream out, int paramInt) throws IOException {
+        while ((paramInt & 0xFFFFFF80) != 0x0) {
+            out.write((paramInt & 0x7F) | 0x80);
+            paramInt >>>= 7;
+        }
+        out.write(paramInt);
+    }
+    
+    public static void closeQuietly(Closeable closeable) {
+    	try {
+    		if (closeable != null) {
+    			closeable.close();
+    		}
+		} catch (IOException e) { }
+    }
+
+}

HolographicDisplays/Plugin/com/gmail/filoghost/holographicdisplays/bridge/bungeecord/serverpinger/ServerAddress.java

@@ -0,0 +1,21 @@
+package com.gmail.filoghost.holographicdisplays.bridge.bungeecord.serverpinger;
+
+public class ServerAddress {
+	
+	private String ip;
+	private int port;
+	
+	public ServerAddress(String ip, int port) {
+		this.ip = ip;
+		this.port = port;
+	}
+
+	public String getAddress() {
+		return ip;
+	}
+
+	public int getPort() {
+		return port;
+	}
+	
+}

HolographicDisplays/Plugin/com/gmail/filoghost/holographicdisplays/bridge/bungeecord/serverpinger/ServerPinger.java

@@ -0,0 +1,18 @@
+package com.gmail.filoghost.holographicdisplays.bridge.bungeecord.serverpinger;
+
+import java.io.IOException;
+import java.net.SocketTimeoutException;
+import java.net.UnknownHostException;
+
+
+public abstract class ServerPinger {
+	
+	// For 1.7 and higher
+    public static final ServerPinger POST_NETTY_REWRITE = new ServerPingerPostNetty();
+    
+    // For 1.6 and lower
+    public static final ServerPinger PRE_NETTY_REWRITE = new ServerPingerPreNetty();
+    
+    public abstract ServerStatus fetchData(final ServerAddress serverAddress, int timeout) throws SocketTimeoutException, UnknownHostException, IOException, Exception;
+    
+}

HolographicDisplays/Plugin/com/gmail/filoghost/holographicdisplays/bridge/bungeecord/serverpinger/ServerPingerPostNetty.java

@@ -0,0 +1,55 @@
+package com.gmail.filoghost.holographicdisplays.bridge.bungeecord.serverpinger;
+
+import java.io.ByteArrayOutputStream;
+import java.io.DataInputStream;
+import java.io.DataOutputStream;
+import java.io.IOException;
+import java.net.Socket;
+import java.net.SocketTimeoutException;
+import java.net.UnknownHostException;
+
+import org.json.simple.JSONObject;
+import org.json.simple.JSONValue;
+
+final class ServerPingerPostNetty extends ServerPinger {
+
+	@Override
+	public ServerStatus fetchData(final ServerAddress serverAddress, int timeout) throws SocketTimeoutException, UnknownHostException, IOException, Exception {
+		
+		Socket socket = null;
+		DataOutputStream dataOut = null;
+		DataInputStream dataIn = null;
+		
+		try {
+			socket = new Socket(serverAddress.getAddress(), serverAddress.getPort());
+			socket.setSoTimeout(timeout);
+			dataOut = new DataOutputStream(socket.getOutputStream());
+			dataIn = new DataInputStream(socket.getInputStream());
+			final ByteArrayOutputStream byteOut = new ByteArrayOutputStream();
+			final DataOutputStream handshake = new DataOutputStream(byteOut);
+			handshake.write(0);
+			PacketUtils.writeVarInt(handshake, 4);
+			PacketUtils.writeString(handshake, serverAddress.getAddress(), PacketUtils.UTF8);
+			handshake.writeShort(serverAddress.getPort());
+			PacketUtils.writeVarInt(handshake, 1);
+			byte[] bytes = byteOut.toByteArray();
+			PacketUtils.writeVarInt(dataOut, bytes.length);
+			dataOut.write(bytes);
+			bytes = new byte[] { 0 };
+			PacketUtils.writeVarInt(dataOut, bytes.length);
+			dataOut.write(bytes);
+			PacketUtils.readVarInt(dataIn);
+			PacketUtils.readVarInt(dataIn);
+			final byte[] responseData = new byte[PacketUtils.readVarInt(dataIn)];
+			dataIn.readFully(responseData);
+			final String jsonString = new String(responseData, PacketUtils.UTF8);
+			return new ServerStatus((JSONObject) JSONValue.parse(jsonString));
+		}
+		finally {
+			PacketUtils.closeQuietly(dataOut);
+			PacketUtils.closeQuietly(dataIn);
+			PacketUtils.closeQuietly(socket);
+		}
+	}
+
+}

HolographicDisplays/Plugin/com/gmail/filoghost/holographicdisplays/bridge/bungeecord/serverpinger/ServerPingerPreNetty.java

@@ -0,0 +1,47 @@
+package com.gmail.filoghost.holographicdisplays.bridge.bungeecord.serverpinger;
+
+import java.lang.Override;
+import java.io.IOException;
+import java.net.SocketTimeoutException;
+import java.net.UnknownHostException;
+import java.lang.Integer;
+import java.io.DataInputStream;
+import java.io.DataOutputStream;
+import java.net.Socket;
+import java.lang.String;
+
+final class ServerPingerPreNetty extends ServerPinger {
+	
+	@Override
+	public ServerStatus fetchData(final ServerAddress serverAddress, int timeout) throws SocketTimeoutException, UnknownHostException, IOException, Exception {
+		
+		Socket socket = null;
+		DataOutputStream dataOut = null;
+		DataInputStream dataIn = null;
+		
+		try {
+			socket = new Socket(serverAddress.getAddress(), serverAddress.getPort());
+			socket.setSoTimeout(timeout);
+			dataOut = new DataOutputStream(socket.getOutputStream());
+			dataIn = new DataInputStream(socket.getInputStream());
+			PacketUtils.a(dataOut, "FE");
+			PacketUtils.a(dataOut, "01");
+			dataIn.readByte();
+			dataIn.readByte();
+			final int length = dataIn.readByte() * 2;
+			final byte[] bytes = new byte[length];
+			dataIn.readFully(bytes);
+			socket.close();
+			final String[] info = new String(bytes, PacketUtils.UTF16BE).split(String.valueOf('\0'));
+			final ServerStatus response = new ServerStatus(true, info[3], Integer.parseInt(info[4]), Integer.parseInt(info[5]));
+			// String versionName = info[2];
+			// String protocol = info[1];
+			return response;
+		}
+		finally {
+			PacketUtils.closeQuietly(dataIn);
+			PacketUtils.closeQuietly(dataOut);
+			PacketUtils.closeQuietly(socket);
+		}
+	}
+}

HolographicDisplays/Plugin/com/gmail/filoghost/holographicdisplays/bridge/bungeecord/serverpinger/ServerStatus.java

@@ -0,0 +1,54 @@
+package com.gmail.filoghost.holographicdisplays.bridge.bungeecord.serverpinger;
+
+import java.lang.Override;
+import java.lang.String;
+
+import org.json.simple.JSONObject;
+
+public class ServerStatus
+{
+	private boolean isOnline;
+    private String motd;
+    private int onlinePlayers;
+    private int maxPlayers;
+    
+    public ServerStatus(boolean isOnline, String motd, int onlinePlayers, int maxPlayers) {
+		this.isOnline = isOnline;
+		this.motd = motd;
+		this.onlinePlayers = onlinePlayers;
+		this.maxPlayers = maxPlayers;
+	}
+
+	public ServerStatus(JSONObject json) {
+    	isOnline = true;
+        motd = ((String) json.get("description")).replace("\n", "");
+        
+        JSONObject playersJson = (JSONObject) json.get("players");
+        onlinePlayers = ((Long) playersJson.get("online")).intValue();
+        maxPlayers = ((Long) playersJson.get("max")).intValue();
+    }
+
+	public boolean isOnline() {
+		return isOnline;
+	}
+
+	public String getMotd() {
+		return motd;
+	}
+
+	public int getOnlinePlayers() {
+		return onlinePlayers;
+	}
+
+	public int getMaxPlayers() {
+		return maxPlayers;
+	}
+
+	@Override
+	public String toString() {
+		return "ServerStatus [motd=" + motd + ", onlinePlayers=" + onlinePlayers + ", maxPlayers=" + maxPlayers + "]";
+	}
+    
+    
+
+}

HolographicDisplays/Plugin/com/gmail/filoghost/holographicdisplays/commands/main/subs/ReloadCommand.java

@@ -49,9 +49,9 @@ public class ReloadCommand extends HologramSubCommand {
 			
 			long startMillis = System.currentTimeMillis();
 
+			UnicodeSymbols.load(HolographicDisplays.getInstance());
 			Configuration.load(HolographicDisplays.getInstance());
 			BungeeServerTracker.startTask(Configuration.bungeeRefreshSeconds);
-			UnicodeSymbols.load(HolographicDisplays.getInstance());
 			HologramDatabase.loadYamlFile(HolographicDisplays.getInstance());
 			AnimationsRegister.loadAnimations(HolographicDisplays.getInstance());
 			PlaceholdersManager.untrackAll();

HolographicDisplays/Plugin/com/gmail/filoghost/holographicdisplays/disk/ConfigNode.java

@@ -1,5 +1,7 @@
 package com.gmail.filoghost.holographicdisplays.disk;
 
+import java.util.Arrays;
+
 public enum ConfigNode {
 
 	SPACE_BETWEEN_LINES("space-between-lines", 0.02),
@@ -9,6 +11,12 @@ public enum ConfigNode {
 	UPDATE_NOTIFICATION("update-notification", true),
 	BUNGEE_REFRESH_SECONDS("bungee.refresh-seconds", 3),
 	BUNGEE_USE_REDIS_BUNGEE("bungee.use-RedisBungee", false),
+	BUNGEE_USE_FULL_PINGER("bungee.pinger.enable", false),
+	BUNGEE_PINGER_TIMEOUT("bungee.pinger.timeout", 2000),
+	BUNGEE_PINGER_OFFLINE_MOTD("bungee.pinger.offline-motd", "&cOffline, couldn't get the MOTD."),
+	BUNGEE_PINGER_ONLINE_FORMAT("bungee.pinger.status.online", "&aOnline"),
+	BUNGEE_PINGER_OFFLINE_FORMAT("bungee.pinger.status.offline", "&cOffline"),
+	BUNGEE_PINGER_SERVERS("bungee.pinger.servers", Arrays.asList("hub: 127.0.0.1:25565", "survival: 127.0.0.1:25566", "minigames: 127.0.0.1:25567")),
 	TIME_FORMAT("time.format", "H:mm"),
 	TIME_ZONE("time.zone", "GMT+1"),
 	DEBUG("debug", false);

HolographicDisplays/Plugin/com/gmail/filoghost/holographicdisplays/disk/Configuration.java

@@ -5,6 +5,7 @@ import java.io.IOException;
 import java.text.SimpleDateFormat;
 import java.util.Arrays;
 import java.util.List;
+import java.util.Map;
 import java.util.TimeZone;
 
 import org.bukkit.ChatColor;
@@ -12,6 +13,7 @@ import org.bukkit.configuration.InvalidConfigurationException;
 import org.bukkit.configuration.file.YamlConfiguration;
 import org.bukkit.plugin.Plugin;
 
+import com.gmail.filoghost.holographicdisplays.bridge.bungeecord.serverpinger.ServerAddress;
 import com.gmail.filoghost.holographicdisplays.util.Utils;
 
 /**
@@ -29,10 +31,15 @@ public class Configuration {
 	public static SimpleDateFormat timeFormat;
 	
 	public static int bungeeRefreshSeconds;
-	public static String bungeeOnlineFormat;
-	public static String bungeeOfflineFormat;
 	public static boolean useRedisBungee;
 	
+	public static boolean pingerEnable;
+	public static int pingerTimeout;
+	public static Map<String, ServerAddress> pingerServers;
+	public static String pingerOfflineMotd;
+	public static String pingerStatusOnline;
+	public static String pingerStatusOffline;
+	
 	public static boolean debug;
 	
 	
@@ -112,6 +119,50 @@ public class Configuration {
 		transparencySymbol = StringConverter.toReadableFormat(config.getString(ConfigNode.TRANSPARENCY_SPACE.getPath()));
 		bungeeRefreshSeconds = config.getInt(ConfigNode.BUNGEE_REFRESH_SECONDS.getPath());
 		useRedisBungee = config.getBoolean(ConfigNode.BUNGEE_USE_REDIS_BUNGEE.getPath());
+		pingerEnable = config.getBoolean(ConfigNode.BUNGEE_USE_FULL_PINGER.getPath());
+		pingerTimeout = config.getInt(ConfigNode.BUNGEE_PINGER_TIMEOUT.getPath());
+		
+		pingerOfflineMotd = StringConverter.toReadableFormat(config.getString(ConfigNode.BUNGEE_PINGER_OFFLINE_MOTD.getPath()));
+		pingerStatusOnline = StringConverter.toReadableFormat(config.getString(ConfigNode.BUNGEE_PINGER_ONLINE_FORMAT.getPath()));
+		pingerStatusOffline = StringConverter.toReadableFormat(config.getString(ConfigNode.BUNGEE_PINGER_OFFLINE_FORMAT.getPath()));
+		
+		if (pingerTimeout <= 0) {
+			pingerTimeout = 1;
+		}
+		
+		pingerServers = Utils.newMap();
+		
+		if (pingerEnable) {
+			for (String singleServer : config.getStringList(ConfigNode.BUNGEE_PINGER_SERVERS.getPath())) {
+				String[] nameAndAddress = singleServer.split(":", 2);
+				if (nameAndAddress.length < 2) {
+					plugin.getLogger().warning("The server info \"" + singleServer + "\" is not valid. There should be a name and an address, separated by a colon.");
+					continue;
+				}
+				
+				String name = nameAndAddress[0].trim();
+				String address = nameAndAddress[1].replace(" ", "");
+				
+				String ip;
+				int port;
+				
+				if (address.contains(":")) {
+					String[] ipAndPort = address.split(":", 2);
+					ip = ipAndPort[0];
+					try {
+						port = Integer.parseInt(ipAndPort[1]);
+					} catch (NumberFormatException e) {
+						plugin.getLogger().warning("Invalid port number in the server info \"" + singleServer + "\".");
+						continue;
+					}
+				} else {
+					ip = address;
+					port = 25565; // The default Minecraft port.
+				}
+				
+				pingerServers.put(name, new ServerAddress(ip, port));
+			}
+		}
 		
 		debug = config.getBoolean(ConfigNode.DEBUG.getPath());
 		

HolographicDisplays/Plugin/com/gmail/filoghost/holographicdisplays/placeholder/PlaceholdersManager.java

@@ -23,6 +23,9 @@ public class PlaceholdersManager {
 	protected static Set<DynamicLineData> linesToUpdate = Utils.newSet();
 	
 	private static final Pattern BUNGEE_ONLINE_PATTERN = makePlaceholderWithArgsPattern("online");
+	private static final Pattern BUNGEE_MAX_PATTERN = makePlaceholderWithArgsPattern("max");
+	private static final Pattern BUNGEE_MOTD_PATTERN = makePlaceholderWithArgsPattern("motd");
+	private static final Pattern BUNGEE_STATUS_PATTERN = makePlaceholderWithArgsPattern("status");
 	private static final Pattern ANIMATION_PATTERN = makePlaceholderWithArgsPattern("animation");
 	private static final Pattern WORLD_PATTERN = makePlaceholderWithArgsPattern("world");
 	
@@ -113,6 +116,10 @@ public class PlaceholdersManager {
 		Set<Placeholder> normalPlaceholders = null;
 		
 		Map<String, PlaceholderReplacer> bungeeOnlinePlayersReplacers = null;
+		Map<String, PlaceholderReplacer> bungeeMaxPlayersReplacers = null;
+		Map<String, PlaceholderReplacer> bungeeStatusReplacers = null;
+		Map<String, PlaceholderReplacer> bungeeMotdReplacers = null;
+		
 		Map<String, PlaceholderReplacer> worldsOnlinePlayersReplacers = null;
 		Map<String, Placeholder> animationsPlaceholders = null;
 		
@@ -165,11 +172,75 @@ public class PlaceholdersManager {
 				
 				@Override
 				public String update() {
-					return String.valueOf(BungeeServerTracker.getPlayersOnline(serverName));
+					return BungeeServerTracker.getPlayersOnline(serverName);
 				}
 			});
 		}
 		
+		// BungeeCord max players pattern.
+		matcher = BUNGEE_MAX_PATTERN.matcher(name);
+		while (matcher.find()) {
+			
+			if (bungeeMaxPlayersReplacers == null) {
+				bungeeMaxPlayersReplacers = Utils.newMap();
+			}
+			
+			final String serverName = extractArgumentFromPlaceholder(matcher);
+			BungeeServerTracker.track(serverName); // Track this server.
+			
+			// Add it to tracked servers.
+			bungeeMaxPlayersReplacers.put(matcher.group(), new PlaceholderReplacer() {
+				
+				@Override
+				public String update() {
+					return BungeeServerTracker.getMaxPlayers(serverName);
+				}
+			});
+		}
+		
+		// BungeeCord motd pattern.
+		matcher = BUNGEE_MOTD_PATTERN.matcher(name);
+		while (matcher.find()) {
+			
+			if (bungeeMotdReplacers == null) {
+				bungeeMotdReplacers = Utils.newMap();
+			}
+			
+			final String serverName = extractArgumentFromPlaceholder(matcher);
+			BungeeServerTracker.track(serverName); // Track this server.
+			
+			// Add it to tracked servers.
+			bungeeMotdReplacers.put(matcher.group(), new PlaceholderReplacer() {
+				
+				@Override
+				public String update() {
+					return BungeeServerTracker.getMotd(serverName);
+				}
+			});
+		}
+		
+		// BungeeCord status pattern.
+		matcher = BUNGEE_STATUS_PATTERN.matcher(name);
+		while (matcher.find()) {
+			
+			if (bungeeStatusReplacers == null) {
+				bungeeStatusReplacers = Utils.newMap();
+			}
+			
+			final String serverName = extractArgumentFromPlaceholder(matcher);
+			BungeeServerTracker.track(serverName); // Track this server.
+			
+			// Add it to tracked servers.
+			bungeeStatusReplacers.put(matcher.group(), new PlaceholderReplacer() {
+				
+				@Override
+				public String update() {
+					return BungeeServerTracker.getOnlineStatus(serverName);
+				}
+			});
+		}
+		
+		
 		// Animation pattern.
 		matcher = ANIMATION_PATTERN.matcher(name);
 		while (matcher.find()) {
@@ -192,7 +263,8 @@ public class PlaceholdersManager {
 			}
 		}
 		
-		if (normalPlaceholders != null || bungeeOnlinePlayersReplacers != null || worldsOnlinePlayersReplacers != null || animationsPlaceholders != null) {
+		if (Utils.isThereNonNull(normalPlaceholders, bungeeOnlinePlayersReplacers, bungeeMaxPlayersReplacers, bungeeMotdReplacers, bungeeStatusReplacers, worldsOnlinePlayersReplacers, animationsPlaceholders)) {
+
 			DynamicLineData lineData = new DynamicLineData(nameableEntity, name);
 			
 			if (normalPlaceholders != null) {
@@ -203,6 +275,18 @@ public class PlaceholdersManager {
 				lineData.getReplacers().putAll(bungeeOnlinePlayersReplacers);
 			}
 			
+			if (bungeeMaxPlayersReplacers != null) {
+				lineData.getReplacers().putAll(bungeeMaxPlayersReplacers);
+			}
+			
+			if (bungeeMotdReplacers != null) {
+				lineData.getReplacers().putAll(bungeeMotdReplacers);
+			}
+			
+			if (bungeeStatusReplacers != null) {
+				lineData.getReplacers().putAll(bungeeStatusReplacers);
+			}
+			
 			if (worldsOnlinePlayersReplacers != null) {
 				lineData.getReplacers().putAll(worldsOnlinePlayersReplacers);
 			}
@@ -236,19 +320,19 @@ public class PlaceholdersManager {
 		
 		if (!lineData.getPlaceholders().isEmpty()) {
 			for (Placeholder placeholder : lineData.getPlaceholders()) {
-				newCustomName = newCustomName.replace(placeholder.getTextPlaceholder(), placeholder.getCurrentReplacement());
+				newCustomName = newCustomName.replace(placeholder.getTextPlaceholder(), Utils.sanitize(placeholder.getCurrentReplacement()));
 			}
 		}
 		
 		if (!lineData.getReplacers().isEmpty()) {
 			for (Entry<String, PlaceholderReplacer> entry : lineData.getReplacers().entrySet()) {
-				newCustomName = newCustomName.replace(entry.getKey(), entry.getValue().update());
+				newCustomName = newCustomName.replace(entry.getKey(), Utils.sanitize(entry.getValue().update()));
 			}
 		}
 		
 		if (!lineData.getAnimations().isEmpty()) {
 			for (Entry<String, Placeholder> entry : lineData.getAnimations().entrySet()) {
-				newCustomName = newCustomName.replace(entry.getKey(), entry.getValue().getCurrentReplacement());
+				newCustomName = newCustomName.replace(entry.getKey(), Utils.sanitize(entry.getValue().getCurrentReplacement()));
 			}
 		}
 		

HolographicDisplays/Plugin/com/gmail/filoghost/holographicdisplays/task/BungeeCleanupTask.java

@@ -5,6 +5,7 @@ import java.util.Map.Entry;
 
 import com.gmail.filoghost.holographicdisplays.bridge.bungeecord.BungeeServerInfo;
 import com.gmail.filoghost.holographicdisplays.bridge.bungeecord.BungeeServerTracker;
+import com.gmail.filoghost.holographicdisplays.util.DebugHandler;
 
 /**
  * A task to remove unused server data in the server tracker.
@@ -17,11 +18,13 @@ public class BungeeCleanupTask implements Runnable {
 		Iterator<Entry<String, BungeeServerInfo>> iter = BungeeServerTracker.getTrackedServers().entrySet().iterator();
 		
 		while (iter.hasNext()) {
-			long lastRequest = iter.next().getValue().getLastRequest();
+			Entry<String, BungeeServerInfo> next = iter.next();
+			long lastRequest = next.getValue().getLastRequest();
 			
 			if (lastRequest != 0 && System.currentTimeMillis() - lastRequest > 600000) { // 10 * 60 * 1000 = 10 minutes.
 				// Don't track that server anymore.
 				iter.remove();
+				DebugHandler.logToConsole("Untracked bungee server \"" + next.getKey() + "\" due to inactivity.");
 			}
 		}
 	}

HolographicDisplays/Plugin/com/gmail/filoghost/holographicdisplays/util/DebugHandler.java

@@ -6,15 +6,25 @@ import com.gmail.filoghost.holographicdisplays.disk.Configuration;
 
 public class DebugHandler {
 
-	public static void handleSpawnFail(HologramLine parentPiece) {
+	public static void logToConsole(String msg) {
 		if (Configuration.debug) {
-			HolographicDisplays.getInstance().getLogger().warning("[Debug] Coulnd't spawn entity for this hologram: " + parentPiece.getParent().toString());
+			HolographicDisplays.getInstance().getLogger().info("[Debug] " + msg);
 		}
 	}
 	
 	public static void handleAnimationLoadSuccess(String name, double speed) {
+		logToConsole("Successfully loaded animation '"  + name + "', speed = " + speed + ".");
+	}
+	
+	public static void handleSpawnFail(HologramLine parentPiece) {
 		if (Configuration.debug) {
-			HolographicDisplays.getInstance().getLogger().info("[Debug] Successfully loaded animation '"  + name + "', speed = " + speed + ".");
+			HolographicDisplays.getInstance().getLogger().severe("[Debug] Coulnd't spawn entity for this hologram: " + parentPiece.getParent().toString());
+		}
+	}
+
+	public static void handleDebugException(Exception e) {
+		if (Configuration.debug) {
+			e.printStackTrace();
 		}
 	}
 

HolographicDisplays/Plugin/com/gmail/filoghost/holographicdisplays/util/Utils.java

@@ -106,4 +106,22 @@ public class Utils extends Object {
 	public static String join(List<String> elements, String separator) {
 		return join(elements, separator, 0, elements.size());
 	}
+	
+	public static String sanitize(String s) {
+		return s != null ? s : "null";
+	}
+	
+	public static boolean isThereNonNull(Object... objects) {
+		if (objects == null) {
+			return false;
+		}
+		
+		for (int i = 0; i < objects.length; i++) {
+			if (objects[i] != null) {
+				return true;
+			}
+		}
+		
+		return false;
+	}
 }