Make some placeholder-related classes not static

plugin/src/main/java/me/filoghost/holographicdisplays/DefaultBackendAPI.java

@@ -24,10 +24,12 @@ public class DefaultBackendAPI extends BackendAPI {
 
     private final APIHologramManager apiHologramManager;
     private final NMSManager nmsManager;
+    private final PlaceholdersRegistry placeholderRegistry;
 
-    public DefaultBackendAPI(APIHologramManager apiHologramManager, NMSManager nmsManager) {
+    public DefaultBackendAPI(APIHologramManager apiHologramManager, NMSManager nmsManager, PlaceholdersRegistry placeholderRegistry) {
         this.apiHologramManager = apiHologramManager;
         this.nmsManager = nmsManager;
+        this.placeholderRegistry = placeholderRegistry;
     }
 
     @Override
@@ -46,7 +48,7 @@ public class DefaultBackendAPI extends BackendAPI {
         Preconditions.checkArgument(refreshRate >= 0, "refreshRate should be positive");
         Preconditions.notNull(replacer, "replacer");
         
-        return PlaceholdersRegistry.register(new Placeholder(plugin, textPlaceholder, refreshRate, replacer));
+        return placeholderRegistry.register(new Placeholder(plugin, textPlaceholder, refreshRate, replacer));
     }
 
     @Override
@@ -64,14 +66,14 @@ public class DefaultBackendAPI extends BackendAPI {
     @Override
     public Collection<String> getRegisteredPlaceholders(Plugin plugin) {
         Preconditions.notNull(plugin, "plugin");
-        return PlaceholdersRegistry.getTextPlaceholdersByPlugin(plugin);
+        return placeholderRegistry.getTextPlaceholdersByPlugin(plugin);
     }
 
     @Override
     public boolean unregisterPlaceholder(Plugin plugin, String textPlaceholder) {
         Preconditions.notNull(plugin, "plugin");
         Preconditions.notNull(textPlaceholder, "textPlaceholder");
-        return PlaceholdersRegistry.unregister(plugin, textPlaceholder);
+        return placeholderRegistry.unregister(plugin, textPlaceholder);
     }
 
     @Override

plugin/src/main/java/me/filoghost/holographicdisplays/HolographicDisplays.java

@@ -47,6 +47,8 @@ public class HolographicDisplays extends FCommonsPlugin implements ProtocolPacke
     private InternalHologramManager internalHologramManager;
     private APIHologramManager apiHologramManager;
     private BungeeServerTracker bungeeServerTracker;
+    private AnimationsRegistry animationRegistry;
+    private PlaceholdersManager placeholderManager;
 
     @Override
     public void onCheckedEnable() throws PluginEnableException {
@@ -87,11 +89,13 @@ public class HolographicDisplays extends FCommonsPlugin implements ProtocolPacke
         } catch (Exception e) {
             throw new PluginEnableException(e, "Couldn't initialize the NMS manager.");
         }
-
+        
         bungeeServerTracker = new BungeeServerTracker(this);
+        animationRegistry = new AnimationsRegistry();
+        placeholderManager = new PlaceholdersManager(bungeeServerTracker, animationRegistry);
         configManager = new ConfigManager(getDataFolder().toPath());
-        internalHologramManager = new InternalHologramManager(nmsManager);
+        internalHologramManager = new InternalHologramManager(nmsManager, placeholderManager);
-        apiHologramManager = new APIHologramManager(nmsManager);
+        apiHologramManager = new APIHologramManager(nmsManager, placeholderManager);
 
         PrintableErrorCollector errorCollector = new PrintableErrorCollector();
 
@@ -107,7 +111,7 @@ public class HolographicDisplays extends FCommonsPlugin implements ProtocolPacke
         ProtocolLibHook.setup(this, nmsManager, this, errorCollector);
         
         // Start repeating tasks.
-        PlaceholdersManager.startRefreshTask(this, bungeeServerTracker);
+        placeholderManager.startRefreshTask(this);
         Bukkit.getScheduler().scheduleSyncRepeatingTask(this, new BungeeCleanupTask(bungeeServerTracker), 5 * 60 * 20, 5 * 60 * 20);
         Bukkit.getScheduler().scheduleSyncRepeatingTask(this, new WorldPlayerCounterTask(), 0L, 3 * 20);
 
@@ -121,7 +125,7 @@ public class HolographicDisplays extends FCommonsPlugin implements ProtocolPacke
         registerListener(updateNotificationListener);
         
         // Enable the API.
-        BackendAPI.setImplementation(new DefaultBackendAPI(apiHologramManager, nmsManager));
+        BackendAPI.setImplementation(new DefaultBackendAPI(apiHologramManager, nmsManager, placeholderManager.getRegistry()));
 
         // Register bStats metrics
         int pluginID = 3123;
@@ -136,7 +140,7 @@ public class HolographicDisplays extends FCommonsPlugin implements ProtocolPacke
     }
     
     public void load(boolean deferHologramsCreation, ErrorCollector errorCollector) {
-        PlaceholdersManager.untrackAll();
+        placeholderManager.untrackAll();
         internalHologramManager.clearAll();
         bungeeServerTracker.resetTrackedServers();
         
@@ -144,7 +148,7 @@ public class HolographicDisplays extends FCommonsPlugin implements ProtocolPacke
         configManager.reloadMainConfig(errorCollector);
         HologramDatabase hologramDatabase = configManager.loadHologramDatabase(errorCollector);
         try {
-            AnimationsRegistry.loadAnimations(configManager, errorCollector);
+            animationRegistry.loadAnimations(configManager, errorCollector);
         } catch (IOException | ConfigException e) {
             errorCollector.add(e, "failed to load animation files");
         }

plugin/src/main/java/me/filoghost/holographicdisplays/object/api/APIHologram.java

@@ -14,6 +14,7 @@ import me.filoghost.holographicdisplays.api.line.TextLine;
 import me.filoghost.holographicdisplays.core.nms.NMSManager;
 import me.filoghost.holographicdisplays.disk.Configuration;
 import me.filoghost.holographicdisplays.object.base.BaseHologram;
+import me.filoghost.holographicdisplays.placeholder.PlaceholdersManager;
 import org.bukkit.Location;
 import org.bukkit.entity.Player;
 import org.bukkit.inventory.ItemStack;
@@ -30,8 +31,8 @@ public class APIHologram extends BaseHologram<APIHologramLine> implements Hologr
 
     private boolean allowPlaceholders;
 
-    protected APIHologram(Location source, Plugin plugin, NMSManager nmsManager, APIHologramManager apiHologramManager) {
+    protected APIHologram(Location source, Plugin plugin, NMSManager nmsManager, APIHologramManager apiHologramManager, PlaceholdersManager placeholderManager) {
-        super(source, nmsManager);
+        super(source, nmsManager, placeholderManager);
         Preconditions.notNull(plugin, "plugin");
         this.plugin = plugin;
         this.apiHologramManager = apiHologramManager;

plugin/src/main/java/me/filoghost/holographicdisplays/object/api/APIHologramManager.java

@@ -8,6 +8,7 @@ package me.filoghost.holographicdisplays.object.api;
 import me.filoghost.holographicdisplays.api.Hologram;
 import me.filoghost.holographicdisplays.core.nms.NMSManager;
 import me.filoghost.holographicdisplays.object.base.BaseHologramManager;
+import me.filoghost.holographicdisplays.placeholder.PlaceholdersManager;
 import org.bukkit.Location;
 import org.bukkit.plugin.Plugin;
 
@@ -19,13 +20,15 @@ import java.util.List;
 public class APIHologramManager extends BaseHologramManager<APIHologram> {
 
     private final NMSManager nmsManager;
+    private final PlaceholdersManager placeholderManager;
 
-    public APIHologramManager(NMSManager nmsManager) {
+    public APIHologramManager(NMSManager nmsManager, PlaceholdersManager placeholderManager) {
         this.nmsManager = nmsManager;
+        this.placeholderManager = placeholderManager;
     }
 
     public Hologram createHologram(Location source, Plugin plugin) {
-        APIHologram hologram = new APIHologram(source, plugin, nmsManager, this);
+        APIHologram hologram = new APIHologram(source, plugin, nmsManager, this, placeholderManager);
         super.addHologram(hologram);
         return hologram;
     }

plugin/src/main/java/me/filoghost/holographicdisplays/object/base/BaseHologram.java

@@ -10,6 +10,7 @@ import me.filoghost.holographicdisplays.core.hologram.StandardHologram;
 import me.filoghost.holographicdisplays.core.hologram.StandardHologramLine;
 import me.filoghost.holographicdisplays.core.nms.NMSManager;
 import me.filoghost.holographicdisplays.disk.Configuration;
+import me.filoghost.holographicdisplays.placeholder.PlaceholdersManager;
 import org.bukkit.Location;
 import org.bukkit.World;
 
@@ -21,12 +22,14 @@ import java.util.List;
 public abstract class BaseHologram<T extends StandardHologramLine> extends BaseHologramComponent implements StandardHologram {
     
     private final NMSManager nmsManager;
+    private final PlaceholdersManager placeholderManager;
     private final List<T> lines;
     private final List<T> unmodifiableLinesView;
     
     private boolean deleted;
 
-    public BaseHologram(Location location, NMSManager nmsManager) {
+    public BaseHologram(Location location, NMSManager nmsManager, PlaceholdersManager placeholderManager) {
+        this.placeholderManager = placeholderManager;
         Preconditions.notNull(location, "location");
         this.setLocation(location);
         this.nmsManager = nmsManager;
@@ -38,6 +41,10 @@ public abstract class BaseHologram<T extends StandardHologramLine> extends BaseH
         return nmsManager;
     }
 
+    protected final PlaceholdersManager getPlaceholderManager() {
+        return placeholderManager;
+    }
+
     @Override
     public boolean isDeleted() {
         return deleted;

plugin/src/main/java/me/filoghost/holographicdisplays/object/base/BaseHologramLine.java

@@ -11,6 +11,7 @@ import me.filoghost.holographicdisplays.core.hologram.StandardHologram;
 import me.filoghost.holographicdisplays.core.hologram.StandardHologramLine;
 import me.filoghost.holographicdisplays.core.nms.NMSManager;
 import me.filoghost.holographicdisplays.core.nms.SpawnFailedException;
+import me.filoghost.holographicdisplays.placeholder.PlaceholdersManager;
 import org.bukkit.World;
 
 public abstract class BaseHologramLine extends BaseHologramComponent implements StandardHologramLine {
@@ -33,6 +34,10 @@ public abstract class BaseHologramLine extends BaseHologramComponent implements
         return hologram.getNMSManager();
     }
 
+    protected final PlaceholdersManager getPlaceholderManager() {
+        return hologram.getPlaceholderManager();
+    }
+
     @Override
     public final void respawn(World world, double x, double y, double z) {
         Preconditions.notNull(world, "world");

plugin/src/main/java/me/filoghost/holographicdisplays/object/base/BaseTextLine.java

@@ -9,7 +9,6 @@ import me.filoghost.holographicdisplays.core.hologram.StandardTextLine;
 import me.filoghost.holographicdisplays.core.nms.SpawnFailedException;
 import me.filoghost.holographicdisplays.core.nms.entity.NMSArmorStand;
 import me.filoghost.holographicdisplays.core.placeholder.RelativePlaceholder;
-import me.filoghost.holographicdisplays.placeholder.PlaceholdersManager;
 import org.bukkit.World;
 
 import java.util.ArrayList;
@@ -41,12 +40,12 @@ public abstract class BaseTextLine extends BaseTouchableLine implements Standard
             if (text != null && !text.isEmpty()) {
                 textEntity.setCustomNameNMS(text);
                 if (isAllowPlaceholders()) {
-                    PlaceholdersManager.trackIfNecessary(this);
+                    getPlaceholderManager().trackIfNecessary(this);
                 }
             } else {
                 textEntity.setCustomNameNMS(""); // It will not appear
                 if (isAllowPlaceholders()) {
-                    PlaceholdersManager.untrack(this);
+                    getPlaceholderManager().untrack(this);
                 }
             }
         }
@@ -72,7 +71,7 @@ public abstract class BaseTextLine extends BaseTouchableLine implements Standard
         }
 
         if (isAllowPlaceholders()) {
-            PlaceholdersManager.trackIfNecessary(this);
+            getPlaceholderManager().trackIfNecessary(this);
         }
     }
     

plugin/src/main/java/me/filoghost/holographicdisplays/object/internal/InternalHologram.java

@@ -8,6 +8,7 @@ package me.filoghost.holographicdisplays.object.internal;
 import me.filoghost.holographicdisplays.HolographicDisplays;
 import me.filoghost.holographicdisplays.core.nms.NMSManager;
 import me.filoghost.holographicdisplays.object.base.BaseHologram;
+import me.filoghost.holographicdisplays.placeholder.PlaceholdersManager;
 import org.bukkit.Location;
 import org.bukkit.entity.Player;
 import org.bukkit.inventory.ItemStack;
@@ -17,8 +18,8 @@ public class InternalHologram extends BaseHologram<InternalHologramLine> {
 
     private final String name;
 
-    protected InternalHologram(Location source, String name, NMSManager nmsManager) {
+    protected InternalHologram(Location source, String name, NMSManager nmsManager, PlaceholdersManager placeholderManager) {
-        super(source, nmsManager);
+        super(source, nmsManager, placeholderManager);
         this.name = name;
     }
 

plugin/src/main/java/me/filoghost/holographicdisplays/object/internal/InternalHologramManager.java

@@ -7,18 +7,21 @@ package me.filoghost.holographicdisplays.object.internal;
 
 import me.filoghost.holographicdisplays.core.nms.NMSManager;
 import me.filoghost.holographicdisplays.object.base.BaseHologramManager;
+import me.filoghost.holographicdisplays.placeholder.PlaceholdersManager;
 import org.bukkit.Location;
 
 public class InternalHologramManager extends BaseHologramManager<InternalHologram> {
     
     private final NMSManager nmsManager;
+    private final PlaceholdersManager placeholderManager;
 
-    public InternalHologramManager(NMSManager nmsManager) {
+    public InternalHologramManager(NMSManager nmsManager, PlaceholdersManager placeholderManager) {
         this.nmsManager = nmsManager;
+        this.placeholderManager = placeholderManager;
     }
 
     public InternalHologram createHologram(Location source, String name) {
-        InternalHologram hologram = new InternalHologram(source, name, nmsManager);
+        InternalHologram hologram = new InternalHologram(source, name, nmsManager, placeholderManager);
         super.addHologram(hologram);
         return hologram;
     }

plugin/src/main/java/me/filoghost/holographicdisplays/placeholder/AnimationsRegistry.java

@@ -24,9 +24,9 @@ public class AnimationsRegistry {
 
     private static final String SPEED_PREFIX = "speed:";
     
-    private static final Map<String, Placeholder> animationsByFilename = new HashMap<>();
+    private final Map<String, Placeholder> animationsByFilename = new HashMap<>();
 
-    public static void loadAnimations(ConfigManager configManager, ErrorCollector errorCollector) throws IOException, ConfigSaveException {
+    public void loadAnimations(ConfigManager configManager, ErrorCollector errorCollector) throws IOException, ConfigSaveException {
         animationsByFilename.clear();
         Path animationFolder = configManager.getAnimationsFolder();
 
@@ -41,7 +41,7 @@ public class AnimationsRegistry {
         }
     }
 
-    private static void readAnimationFile(Path file, ErrorCollector errorCollector) {
+    private void readAnimationFile(Path file, ErrorCollector errorCollector) {
         String fileName = file.getFileName().toString();
         
         try {
@@ -89,11 +89,11 @@ public class AnimationsRegistry {
     }
 
 
-    public static Map<String, Placeholder> getAnimationsByFilename() {
+    public Map<String, Placeholder> getAnimationsByFilename() {
         return animationsByFilename;
     }
 
-    public static Placeholder getAnimation(String name) {
+    public Placeholder getAnimation(String name) {
         return animationsByFilename.get(name);
     }
     

plugin/src/main/java/me/filoghost/holographicdisplays/placeholder/PlaceholdersManager.java

@@ -26,9 +26,6 @@ import java.util.regex.Pattern;
 
 public class PlaceholdersManager {
     
-    private static long elapsedTenthsOfSecond;
-    protected static final Set<DynamicLineData> linesToUpdate = new HashSet<>();
-    
     private static final Pattern BUNGEE_ONLINE_PATTERN = makePlaceholderWithArgsPattern("online");
     private static final Pattern BUNGEE_MAX_PATTERN = makePlaceholderWithArgsPattern("max_players");
     private static final Pattern BUNGEE_MOTD_PATTERN = makePlaceholderWithArgsPattern("motd");
@@ -36,24 +33,26 @@ public class PlaceholdersManager {
     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");
-    
-    private static BungeeServerTracker bungeeServerTracker;
 
-    private static Pattern makePlaceholderWithArgsPattern(String prefix) {
+    private final PlaceholdersRegistry placeholderRegistry;
-        return Pattern.compile("(\\{" + Pattern.quote(prefix) + ":)(.+?)(\\})");
+    private final AnimationsRegistry animationRegistry;
-    }
+    private final BungeeServerTracker bungeeServerTracker;
-    
+    protected final Set<DynamicLineData> linesToUpdate;
-    private static String extractArgumentFromPlaceholder(Matcher matcher) {
+    private long elapsedTenthsOfSecond;
-        return matcher.group(2).trim();
-    }
-    
-    
-    public static void startRefreshTask(Plugin plugin, BungeeServerTracker bungeeServerTracker) {
-        PlaceholdersManager.bungeeServerTracker = bungeeServerTracker;
 
+    public PlaceholdersManager(BungeeServerTracker bungeeServerTracker, AnimationsRegistry animationRegistry) {
+        this.placeholderRegistry = new PlaceholdersRegistry(this);
+        this.animationRegistry = animationRegistry;
+        this.bungeeServerTracker = bungeeServerTracker;
+        this.linesToUpdate = new HashSet<>();
+        
+        placeholderRegistry.addDefaultPlaceholders();
+    }
+
+    public void startRefreshTask(Plugin plugin) {
         Bukkit.getScheduler().scheduleSyncRepeatingTask(plugin, () -> {
             
-            for (Placeholder placeholder : PlaceholdersRegistry.getPlaceholders()) {
+            for (Placeholder placeholder : placeholderRegistry.getPlaceholders()) {
                 if (elapsedTenthsOfSecond % placeholder.getTenthsToRefresh() == 0) {
                     try {
                         placeholder.update();
@@ -63,7 +62,7 @@ public class PlaceholdersManager {
                 }
             }
             
-            for (Placeholder placeholder : AnimationsRegistry.getAnimationsByFilename().values()) {
+            for (Placeholder placeholder : animationRegistry.getAnimationsByFilename().values()) {
                 if (elapsedTenthsOfSecond % placeholder.getTenthsToRefresh() == 0) {
                     placeholder.update();
                 }
@@ -88,11 +87,11 @@ public class PlaceholdersManager {
     }
     
     
-    public static void untrackAll() {
+    public void untrackAll() {
         linesToUpdate.clear();
     }
     
-    public static void untrack(StandardTextLine line) {
+    public void untrack(StandardTextLine line) {
         Iterator<DynamicLineData> iter = linesToUpdate.iterator();
         while (iter.hasNext()) {
             DynamicLineData data = iter.next();
@@ -103,7 +102,7 @@ public class PlaceholdersManager {
         }
     }
     
-    public static void trackIfNecessary(StandardTextLine line) {        
+    public void trackIfNecessary(StandardTextLine line) {        
         String text = line.getText();
         if (text == null || text.isEmpty()) {
             return;
@@ -124,7 +123,7 @@ public class PlaceholdersManager {
         
         Matcher matcher;
         
-        for (Placeholder placeholder : PlaceholdersRegistry.getPlaceholders()) {
+        for (Placeholder placeholder : placeholderRegistry.getPlaceholders()) {
             if (text.contains(placeholder.getTextPlaceholder())) {
                 if (normalPlaceholders == null) {
                     normalPlaceholders = new HashSet<>();
@@ -266,7 +265,7 @@ public class PlaceholdersManager {
         matcher = ANIMATION_PATTERN.matcher(text);
         while (matcher.find()) {
             String fileName = extractArgumentFromPlaceholder(matcher);
-            Placeholder animation = AnimationsRegistry.getAnimation(fileName);
+            Placeholder animation = animationRegistry.getAnimation(fileName);
             
             // If exists...
             if (animation != null) {
@@ -319,7 +318,7 @@ public class PlaceholdersManager {
     }
     
     
-    private static void updatePlaceholders(DynamicLineData lineData) {
+    private void updatePlaceholders(DynamicLineData lineData) {
         String oldCustomName = lineData.getEntity().getCustomNameStringNMS();
         String newCustomName = lineData.getOriginalName();
         
@@ -347,4 +346,16 @@ public class PlaceholdersManager {
         }
     }
 
+    public PlaceholdersRegistry getRegistry() {
+        return placeholderRegistry;
+    }
+
+    private static Pattern makePlaceholderWithArgsPattern(String prefix) {
+        return Pattern.compile("(\\{" + Pattern.quote(prefix) + ":)(.+?)(\\})");
+    }
+
+    private static String extractArgumentFromPlaceholder(Matcher matcher) {
+        return matcher.group(2).trim();
+    }
+
 }

plugin/src/main/java/me/filoghost/holographicdisplays/placeholder/PlaceholdersRegistry.java

@@ -18,40 +18,17 @@ import java.util.Iterator;
 import java.util.Set;
 
 public class PlaceholdersRegistry {
+
+    private final PlaceholdersManager placeholderManager;
+    private final Set<Placeholder> placeholders;
     
-    private static final Set<Placeholder> placeholders = new HashSet<>();
+    public PlaceholdersRegistry(PlaceholdersManager placeholderManager) {
-    
+        this.placeholderManager = placeholderManager;
-    // Register the default placeholders statically.
+        this.placeholders = new HashSet<>();
-    static {
-        
-        register(new Placeholder(HolographicDisplays.getInstance(), "{online}", 1.0, () -> {
-            return String.valueOf(Bukkit.getOnlinePlayers().size());
-        }));
-        
-        register(new Placeholder(HolographicDisplays.getInstance(), "{max_players}", 10.0, () -> {
-            return String.valueOf(Bukkit.getMaxPlayers());
-        }));
-        
-        register(new Placeholder(HolographicDisplays.getInstance(), "{motd}", 60.0, () -> {
-            return Bukkit.getMotd();
-        }));
-        
-        register(new Placeholder(HolographicDisplays.getInstance(), "{time}", 0.9, () -> {
-            return Configuration.timeFormat.format(Instant.now());
-        }));
-        
-        register(new Placeholder(HolographicDisplays.getInstance(), "&u", 0.2, new CyclicPlaceholderReplacer(Utils.toStringList(
-                ChatColor.RED,
-                ChatColor.GOLD,
-                ChatColor.YELLOW,
-                ChatColor.GREEN,
-                ChatColor.AQUA,
-                ChatColor.LIGHT_PURPLE
-        ))));
     }
-    
+
-    
+
-    public static boolean register(Placeholder placeholder) {
+    public boolean register(Placeholder placeholder) {
         if (placeholders.contains(placeholder)) {
             return false;
         }
@@ -60,7 +37,7 @@ public class PlaceholdersRegistry {
         return true;
     }
     
-    public static Set<String> getTextPlaceholdersByPlugin(Plugin plugin) {
+    public Set<String> getTextPlaceholdersByPlugin(Plugin plugin) {
         Set<String> found = new HashSet<>();
         
         for (Placeholder placeholder : placeholders) {
@@ -72,7 +49,7 @@ public class PlaceholdersRegistry {
         return found;
     }
     
-    public static boolean unregister(Plugin plugin, String textPlaceholder) {
+    public boolean unregister(Plugin plugin, String textPlaceholder) {
         Iterator<Placeholder> iter = placeholders.iterator();
         
         while (iter.hasNext()) {
@@ -81,7 +58,7 @@ public class PlaceholdersRegistry {
             if (placeholder.getOwner().equals(plugin) && placeholder.getTextPlaceholder().equals(textPlaceholder)) {
                 iter.remove();
             
-                for (DynamicLineData data : PlaceholdersManager.linesToUpdate) {
+                for (DynamicLineData data : placeholderManager.linesToUpdate) {
                     data.getPlaceholders().remove(placeholder);
                 }
                 
@@ -92,8 +69,35 @@ public class PlaceholdersRegistry {
         return false;
     }
     
-    protected static Set<Placeholder> getPlaceholders() {
+    protected Set<Placeholder> getPlaceholders() {
         return placeholders;
     }
 
+    public void addDefaultPlaceholders() {
+        register(new Placeholder(HolographicDisplays.getInstance(), "{online}", 1.0, () -> {
+            return String.valueOf(Bukkit.getOnlinePlayers().size());
+        }));
+
+        register(new Placeholder(HolographicDisplays.getInstance(), "{max_players}", 10.0, () -> {
+            return String.valueOf(Bukkit.getMaxPlayers());
+        }));
+
+        register(new Placeholder(HolographicDisplays.getInstance(), "{motd}", 60.0, () -> {
+            return Bukkit.getMotd();
+        }));
+
+        register(new Placeholder(HolographicDisplays.getInstance(), "{time}", 0.9, () -> {
+            return Configuration.timeFormat.format(Instant.now());
+        }));
+
+        register(new Placeholder(HolographicDisplays.getInstance(), "&u", 0.2, new CyclicPlaceholderReplacer(Utils.toStringList(
+                ChatColor.RED,
+                ChatColor.GOLD,
+                ChatColor.YELLOW,
+                ChatColor.GREEN,
+                ChatColor.AQUA,
+                ChatColor.LIGHT_PURPLE
+        ))));
+    }
+
 }