Experimental and potentially unstable: async packet sending

core/src/main/java/me/filoghost/holographicdisplays/core/HolographicDisplaysCore.java

@@ -24,6 +24,7 @@ import me.filoghost.holographicdisplays.core.placeholder.tracking.ActivePlacehol
 import me.filoghost.holographicdisplays.core.tick.TickClock;
 import me.filoghost.holographicdisplays.core.tick.TickingTask;
 import me.filoghost.holographicdisplays.core.tracking.LineTrackerManager;
+import me.filoghost.holographicdisplays.core.tracking.PacketSenderExecutor;
 import me.filoghost.holographicdisplays.nms.common.NMSManager;
 import org.bukkit.Bukkit;
 import org.bukkit.entity.Player;
@@ -47,6 +48,8 @@ public class HolographicDisplaysCore {
             throw new PluginEnableException(t, "Couldn't initialize the NMS manager.");
         }
 
+        PacketSenderExecutor.start();
+
         PlaceholderRegistry placeholderRegistry = new PlaceholderRegistry();
         TickClock tickClock = new TickClock();
         ActivePlaceholderTracker placeholderTracker = new ActivePlaceholderTracker(placeholderRegistry, tickClock);
@@ -103,6 +106,8 @@ public class HolographicDisplaysCore {
                 nmsManager.uninjectPacketListener(player);
             }
         }
+
+        PacketSenderExecutor.stopGracefully();
     }
 
 }

core/src/main/java/me/filoghost/holographicdisplays/core/tracking/ClickableLineTracker.java

@@ -85,7 +85,11 @@ public abstract class ClickableLineTracker<T extends Viewer> extends LineTracker
     @Override
     protected void sendSpawnPackets(Viewers<T> viewers) {
         if (spawnClickableEntity) {
-            viewers.sendPackets(clickableEntity.newSpawnPackets(getClickableEntityPosition()));
+            // Copy for async use
+            PositionCoordinates clickableEntityPosition = getClickableEntityPosition();
+            PacketSenderExecutor.execute(() -> {
+                viewers.sendPackets(clickableEntity.newSpawnPackets(clickableEntityPosition));
+            });
         }
     }
 
@@ -93,7 +97,9 @@ public abstract class ClickableLineTracker<T extends Viewer> extends LineTracker
     @Override
     protected void sendDestroyPackets(Viewers<T> viewers) {
         if (spawnClickableEntity) {
+            PacketSenderExecutor.execute(() -> {
                 viewers.sendPackets(clickableEntity.newDestroyPackets());
+            });
         }
     }
 
@@ -104,9 +110,15 @@ public abstract class ClickableLineTracker<T extends Viewer> extends LineTracker
 
         if (spawnClickableEntityChanged) {
             if (spawnClickableEntity) {
-                viewers.sendPackets(clickableEntity.newSpawnPackets(getClickableEntityPosition()));
+                // Copy for async use
+                PositionCoordinates clickableEntityPosition = getClickableEntityPosition();
+                PacketSenderExecutor.execute(() -> {
+                    viewers.sendPackets(clickableEntity.newSpawnPackets(clickableEntityPosition));
+                });
             } else {
+                PacketSenderExecutor.execute(() -> {
                     viewers.sendPackets(clickableEntity.newDestroyPackets());
+                });
             }
         }
     }
@@ -115,7 +127,11 @@ public abstract class ClickableLineTracker<T extends Viewer> extends LineTracker
     @Override
     protected void sendPositionChangePackets(Viewers<T> viewers) {
         if (spawnClickableEntity) {
-            viewers.sendPackets(clickableEntity.newTeleportPackets(getClickableEntityPosition()));
+            // Copy for async use
+            PositionCoordinates clickableEntityPosition = getClickableEntityPosition();
+            PacketSenderExecutor.execute(() -> {
+                viewers.sendPackets(clickableEntity.newTeleportPackets(clickableEntityPosition));
+            });
         }
     }
 

core/src/main/java/me/filoghost/holographicdisplays/core/tracking/ItemLineTracker.java

@@ -5,6 +5,7 @@
  */
 package me.filoghost.holographicdisplays.core.tracking;
 
+import me.filoghost.holographicdisplays.common.PositionCoordinates;
 import me.filoghost.holographicdisplays.core.base.BaseItemHologramLine;
 import me.filoghost.holographicdisplays.core.listener.LineClickListener;
 import me.filoghost.holographicdisplays.core.tick.CachedPlayer;
@@ -106,7 +107,12 @@ public class ItemLineTracker extends ClickableLineTracker<Viewer> {
         super.sendSpawnPackets(viewers);
 
         if (spawnItemEntity) {
+            // Copy for async use
+            PositionCoordinates positionCoordinates = this.positionCoordinates;
+            ItemStack itemStack = this.itemStack;
+            PacketSenderExecutor.execute(() -> {
                 viewers.sendPackets(itemEntity.newSpawnPackets(positionCoordinates, itemStack));
+            });
         }
     }
 
@@ -116,7 +122,9 @@ public class ItemLineTracker extends ClickableLineTracker<Viewer> {
         super.sendDestroyPackets(viewers);
 
         if (spawnItemEntity) {
+            PacketSenderExecutor.execute(() -> {
                 viewers.sendPackets(itemEntity.newDestroyPackets());
+            });
         }
     }
 
@@ -127,13 +135,24 @@ public class ItemLineTracker extends ClickableLineTracker<Viewer> {
 
         if (spawnItemEntityChanged) {
             if (spawnItemEntity) {
+                // Copy for async use
+                PositionCoordinates positionCoordinates = this.positionCoordinates;
+                ItemStack itemStack = this.itemStack;
+                PacketSenderExecutor.execute(() -> {
                     viewers.sendPackets(itemEntity.newSpawnPackets(positionCoordinates, itemStack));
+                });
             } else {
+                PacketSenderExecutor.execute(() -> {
                     viewers.sendPackets(itemEntity.newDestroyPackets());
+                });
             }
         } else if (itemStackChanged) {
             // Only send item changes if full spawn/destroy packets were not sent
+            // Copy for async use
+            ItemStack itemStack = this.itemStack;
+            PacketSenderExecutor.execute(() -> {
                 viewers.sendPackets(itemEntity.newChangePackets(itemStack));
+            });
         }
     }
 
@@ -143,7 +162,11 @@ public class ItemLineTracker extends ClickableLineTracker<Viewer> {
         super.sendPositionChangePackets(viewers);
 
         if (spawnItemEntity) {
+            // Copy for async use
+            PositionCoordinates positionCoordinates = this.positionCoordinates;
+            PacketSenderExecutor.execute(() -> {
                 viewers.sendPackets(itemEntity.newTeleportPackets(positionCoordinates));
+            });
         }
     }
 

core/src/main/java/me/filoghost/holographicdisplays/core/tracking/LineTracker.java

@@ -14,14 +14,14 @@ import org.bukkit.entity.Player;
 import org.jetbrains.annotations.MustBeInvokedByOverriders;
 
 import java.util.Collection;
-import java.util.HashMap;
 import java.util.List;
-import java.util.Map;
 import java.util.Objects;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.ConcurrentMap;
 
 public abstract class LineTracker<T extends Viewer> {
 
-    private final Map<Player, T> viewers;
+    private final ConcurrentMap<Player, T> viewers;
     private final Viewers<T> iterableViewers;
 
     private String positionWorldName;
@@ -32,7 +32,7 @@ public abstract class LineTracker<T extends Viewer> {
     private int lastVisibilitySettingsVersion;
 
     protected LineTracker() {
-        this.viewers = new HashMap<>();
+        this.viewers = new ConcurrentHashMap<>();
         this.iterableViewers = new DelegateViewers<>(viewers.values());
     }
 

core/src/main/java/me/filoghost/holographicdisplays/core/tracking/MutableViewers.java

@@ -15,7 +15,7 @@ public class MutableViewers<T extends Viewer> implements Viewers<T> {
     private T viewer;
     private List<T> additionalViewers;
 
-    public void add(T viewer) {
+    public synchronized void add(T viewer) {
         if (this.viewer == null) {
             this.viewer = viewer;
         } else {
@@ -27,7 +27,7 @@ public class MutableViewers<T extends Viewer> implements Viewers<T> {
     }
 
     @Override
-    public void forEach(Consumer<? super T> action) {
+    public synchronized void forEach(Consumer<? super T> action) {
         if (viewer != null) {
             action.accept(viewer);
             if (additionalViewers != null) {

core/src/main/java/me/filoghost/holographicdisplays/core/tracking/PacketSenderExecutor.java

@@ -0,0 +1,69 @@
+/*
+ * Copyright (C) filoghost and contributors
+ *
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+package me.filoghost.holographicdisplays.core.tracking;
+
+import me.filoghost.fcommons.logging.Log;
+
+import java.util.concurrent.BlockingQueue;
+import java.util.concurrent.LinkedBlockingQueue;
+
+/**
+ * This is a quick but ugly helper class for creating and sending packets async.
+ * Static classes like this should be avoided.
+ */
+public class PacketSenderExecutor {
+
+    private static volatile BlockingQueue<Runnable> tasks;
+    private static volatile Thread thread;
+
+    private static final Runnable STOP_MARKER_TASK = () -> {};
+
+    static {
+        tasks = new LinkedBlockingQueue<>();
+        thread = new Thread(() -> {
+            while (true) {
+                try {
+                    Runnable task = tasks.take();
+                    task.run();
+                } catch (Throwable t) {
+                    Log.severe("Error in packet sender task", t);
+                }
+            }
+        });
+        thread.setName("Holographic Displays async packets");
+        thread.start();
+    }
+
+    public static void execute(Runnable task) {
+        tasks.add(task);
+    }
+
+    public static void start() {
+        tasks = new LinkedBlockingQueue<>();
+        thread = new Thread(() -> {
+            while (true) {
+                try {
+                    Runnable task = tasks.take();
+                    if (task == STOP_MARKER_TASK) {
+                        return;
+                    }
+                    task.run();
+                } catch (Throwable t) {
+                    Log.severe("Error in packet sender task", t);
+                }
+            }
+        });
+        thread.setName("Holographic Displays packet sender");
+        thread.start();
+    }
+
+    public static void stopGracefully() {
+        if (tasks != null) {
+            tasks.add(STOP_MARKER_TASK);
+        }
+    }
+
+}

core/src/main/java/me/filoghost/holographicdisplays/core/tracking/TextLineTracker.java

@@ -5,6 +5,7 @@
  */
 package me.filoghost.holographicdisplays.core.tracking;
 
+import me.filoghost.holographicdisplays.common.PositionCoordinates;
 import me.filoghost.holographicdisplays.core.base.BaseTextHologramLine;
 import me.filoghost.holographicdisplays.core.listener.LineClickListener;
 import me.filoghost.holographicdisplays.core.placeholder.tracking.ActivePlaceholderTracker;
@@ -84,15 +85,22 @@ public class TextLineTracker extends ClickableLineTracker<TextLineViewer> {
     protected void sendSpawnPackets(Viewers<TextLineViewer> viewers) {
         super.sendSpawnPackets(viewers);
 
+        // Copy for async use
+        PositionCoordinates positionCoordinates = this.positionCoordinates;
+        viewers.forEach(TextLineViewer::updateNextTextToSend);
+        PacketSenderExecutor.execute(() -> {
             IndividualTextPacketGroup spawnPackets = textEntity.newSpawnPackets(positionCoordinates);
             viewers.forEach(viewer -> viewer.sendTextPackets(spawnPackets));
+        });
     }
 
     @MustBeInvokedByOverriders
     @Override
     protected void sendDestroyPackets(Viewers<TextLineViewer> viewers) {
         super.sendDestroyPackets(viewers);
+        PacketSenderExecutor.execute(() -> {
             viewers.sendPackets(textEntity.newDestroyPackets());
+        });
     }
 
     @Override
@@ -100,8 +108,11 @@ public class TextLineTracker extends ClickableLineTracker<TextLineViewer> {
         super.sendChangesPackets(viewers);
 
         if (displayTextChanged) {
+            viewers.forEach(TextLineViewer::updateNextTextToSend);
+            PacketSenderExecutor.execute(() -> {
                 IndividualTextPacketGroup changePackets = textEntity.newChangePackets();
                 viewers.forEach(viewer -> viewer.sendTextPacketsIfNecessary(changePackets));
+            });
         }
     }
 
@@ -109,7 +120,11 @@ public class TextLineTracker extends ClickableLineTracker<TextLineViewer> {
     @Override
     protected void sendPositionChangePackets(Viewers<TextLineViewer> viewers) {
         super.sendPositionChangePackets(viewers);
+        // Copy for async use
+        PositionCoordinates positionCoordinates = this.positionCoordinates;
+        PacketSenderExecutor.execute(() -> {
             viewers.sendPackets(textEntity.newTeleportPackets(positionCoordinates));
+        });
     }
 
     @Override

core/src/main/java/me/filoghost/holographicdisplays/core/tracking/TextLineViewer.java

@@ -5,9 +5,8 @@
  */
 package me.filoghost.holographicdisplays.core.tracking;
 
-import me.filoghost.holographicdisplays.nms.common.IndividualTextPacketGroup;
 import me.filoghost.holographicdisplays.core.tick.CachedPlayer;
-import org.jetbrains.annotations.Nullable;
+import me.filoghost.holographicdisplays.nms.common.IndividualTextPacketGroup;
 
 import java.util.Objects;
 
@@ -15,8 +14,10 @@ class TextLineViewer extends Viewer {
 
     private final DisplayText displayText;
 
+    // Access to these variables must be synchronized, they are accessed from multiple threads
     private String individualText;
     private String lastSentText;
+    private String nextTextToSend;
 
     TextLineViewer(CachedPlayer player, DisplayText displayText) {
         super(player);
@@ -24,34 +25,41 @@ class TextLineViewer extends Viewer {
     }
 
     public void sendTextPackets(IndividualTextPacketGroup packets) {
-        String text = getOrComputeText();
+        String text;
+        synchronized (this) {
+            text = nextTextToSend;
             this.lastSentText = text;
+        }
         sendIndividualPackets(packets, text);
     }
 
     public void sendTextPacketsIfNecessary(IndividualTextPacketGroup packets) {
-        String text = getOrComputeText();
+        String text;
+        synchronized (this) {
+            text = nextTextToSend;
             if (Objects.equals(lastSentText, text)) {
                 return; // Avoid sending unnecessary packets
             }
             this.lastSentText = text;
+        }
         sendIndividualPackets(packets, text);
     }
 
-    private @Nullable String getOrComputeText() {
+    public synchronized void updateNextTextToSend() {
         if (displayText.containsIndividualPlaceholders()) {
             if (individualText == null) {
                 individualText = displayText.computeIndividualText(this);
             }
-            return individualText;
+            nextTextToSend = individualText;
         } else {
             individualText = null;
-            return displayText.getGlobalText();
+            nextTextToSend = displayText.getGlobalText();
         }
     }
 
     public boolean updateIndividualText() {
         String individualText = displayText.computeIndividualText(this);
+        synchronized (this) {
             if (!Objects.equals(this.individualText, individualText)) {
                 this.individualText = individualText;
                 return true;
@@ -59,5 +67,6 @@ class TextLineViewer extends Viewer {
                 return false;
             }
         }
+    }
 
 }

nms/v1_10_r1/src/main/java/me/filoghost/holographicdisplays/nms/v1_10_R1/PacketByteBuffer.java

@@ -14,13 +14,14 @@ import java.util.UUID;
 
 class PacketByteBuffer {
 
-    private static final PacketByteBuffer INSTANCE = new PacketByteBuffer();
+    private static final ThreadLocal<PacketByteBuffer> LOCAL_INSTANCE = ThreadLocal.withInitial(PacketByteBuffer::new);
 
     private final PacketDataSerializer serializer;
 
     static PacketByteBuffer get() {
-        INSTANCE.clear();
+        PacketByteBuffer instance = LOCAL_INSTANCE.get();
-        return INSTANCE;
+        instance.clear();
+        return instance;
     }
 
     private PacketByteBuffer() {

nms/v1_11_r1/src/main/java/me/filoghost/holographicdisplays/nms/v1_11_R1/PacketByteBuffer.java

@@ -14,13 +14,14 @@ import java.util.UUID;
 
 class PacketByteBuffer {
 
-    private static final PacketByteBuffer INSTANCE = new PacketByteBuffer();
+    private static final ThreadLocal<PacketByteBuffer> LOCAL_INSTANCE = ThreadLocal.withInitial(PacketByteBuffer::new);
 
     private final PacketDataSerializer serializer;
 
     static PacketByteBuffer get() {
-        INSTANCE.clear();
+        PacketByteBuffer instance = LOCAL_INSTANCE.get();
-        return INSTANCE;
+        instance.clear();
+        return instance;
     }
 
     private PacketByteBuffer() {

nms/v1_12_r1/src/main/java/me/filoghost/holographicdisplays/nms/v1_12_R1/PacketByteBuffer.java

@@ -14,13 +14,14 @@ import java.util.UUID;
 
 class PacketByteBuffer {
 
-    private static final PacketByteBuffer INSTANCE = new PacketByteBuffer();
+    private static final ThreadLocal<PacketByteBuffer> LOCAL_INSTANCE = ThreadLocal.withInitial(PacketByteBuffer::new);
 
     private final PacketDataSerializer serializer;
 
     static PacketByteBuffer get() {
-        INSTANCE.clear();
+        PacketByteBuffer instance = LOCAL_INSTANCE.get();
-        return INSTANCE;
+        instance.clear();
+        return instance;
     }
 
     private PacketByteBuffer() {

nms/v1_13_r2/src/main/java/me/filoghost/holographicdisplays/nms/v1_13_R2/PacketByteBuffer.java

@@ -14,13 +14,14 @@ import java.util.UUID;
 
 class PacketByteBuffer {
 
-    private static final PacketByteBuffer INSTANCE = new PacketByteBuffer();
+    private static final ThreadLocal<PacketByteBuffer> LOCAL_INSTANCE = ThreadLocal.withInitial(PacketByteBuffer::new);
 
     private final PacketDataSerializer serializer;
 
     static PacketByteBuffer get() {
-        INSTANCE.clear();
+        PacketByteBuffer instance = LOCAL_INSTANCE.get();
-        return INSTANCE;
+        instance.clear();
+        return instance;
     }
 
     private PacketByteBuffer() {

nms/v1_14_r1/src/main/java/me/filoghost/holographicdisplays/nms/v1_14_R1/PacketByteBuffer.java

@@ -14,13 +14,14 @@ import java.util.UUID;
 
 class PacketByteBuffer {
 
-    private static final PacketByteBuffer INSTANCE = new PacketByteBuffer();
+    private static final ThreadLocal<PacketByteBuffer> LOCAL_INSTANCE = ThreadLocal.withInitial(PacketByteBuffer::new);
 
     private final PacketDataSerializer serializer;
 
     static PacketByteBuffer get() {
-        INSTANCE.clear();
+        PacketByteBuffer instance = LOCAL_INSTANCE.get();
-        return INSTANCE;
+        instance.clear();
+        return instance;
     }
 
     private PacketByteBuffer() {

nms/v1_15_r1/src/main/java/me/filoghost/holographicdisplays/nms/v1_15_R1/PacketByteBuffer.java

@@ -14,13 +14,14 @@ import java.util.UUID;
 
 class PacketByteBuffer {
 
-    private static final PacketByteBuffer INSTANCE = new PacketByteBuffer();
+    private static final ThreadLocal<PacketByteBuffer> LOCAL_INSTANCE = ThreadLocal.withInitial(PacketByteBuffer::new);
 
     private final PacketDataSerializer serializer;
 
     static PacketByteBuffer get() {
-        INSTANCE.clear();
+        PacketByteBuffer instance = LOCAL_INSTANCE.get();
-        return INSTANCE;
+        instance.clear();
+        return instance;
     }
 
     private PacketByteBuffer() {

nms/v1_16_r3/src/main/java/me/filoghost/holographicdisplays/nms/v1_16_R3/PacketByteBuffer.java

@@ -14,13 +14,14 @@ import java.util.UUID;
 
 class PacketByteBuffer {
 
-    private static final PacketByteBuffer INSTANCE = new PacketByteBuffer();
+    private static final ThreadLocal<PacketByteBuffer> LOCAL_INSTANCE = ThreadLocal.withInitial(PacketByteBuffer::new);
 
     private final PacketDataSerializer serializer;
 
     static PacketByteBuffer get() {
-        INSTANCE.clear();
+        PacketByteBuffer instance = LOCAL_INSTANCE.get();
-        return INSTANCE;
+        instance.clear();
+        return instance;
     }
 
     void writeBoolean(boolean flag) {

nms/v1_17_r1/src/main/java/me/filoghost/holographicdisplays/nms/v1_17_R1/PacketByteBuffer.java

@@ -12,13 +12,14 @@ import java.util.UUID;
 
 class PacketByteBuffer {
 
-    private static final PacketByteBuffer INSTANCE = new PacketByteBuffer();
+    private static final ThreadLocal<PacketByteBuffer> LOCAL_INSTANCE = ThreadLocal.withInitial(PacketByteBuffer::new);
 
     private final PacketDataSerializer serializer;
 
     static PacketByteBuffer get() {
-        INSTANCE.clear();
+        PacketByteBuffer instance = LOCAL_INSTANCE.get();
-        return INSTANCE;
+        instance.clear();
+        return instance;
     }
 
     private PacketByteBuffer() {

nms/v1_18_r1/src/main/java/me/filoghost/holographicdisplays/nms/v1_18_R1/PacketByteBuffer.java

@@ -12,13 +12,14 @@ import java.util.UUID;
 
 class PacketByteBuffer {
 
-    private static final PacketByteBuffer INSTANCE = new PacketByteBuffer();
+    private static final ThreadLocal<PacketByteBuffer> LOCAL_INSTANCE = ThreadLocal.withInitial(PacketByteBuffer::new);
 
     private final PacketDataSerializer serializer;
 
     static PacketByteBuffer get() {
-        INSTANCE.clear();
+        PacketByteBuffer instance = LOCAL_INSTANCE.get();
-        return INSTANCE;
+        instance.clear();
+        return instance;
     }
 
     private PacketByteBuffer() {

nms/v1_18_r2/src/main/java/me/filoghost/holographicdisplays/nms/v1_18_R2/PacketByteBuffer.java

@@ -12,13 +12,14 @@ import java.util.UUID;
 
 class PacketByteBuffer {
 
-    private static final PacketByteBuffer INSTANCE = new PacketByteBuffer();
+    private static final ThreadLocal<PacketByteBuffer> LOCAL_INSTANCE = ThreadLocal.withInitial(PacketByteBuffer::new);
 
     private final PacketDataSerializer serializer;
 
     static PacketByteBuffer get() {
-        INSTANCE.clear();
+        PacketByteBuffer instance = LOCAL_INSTANCE.get();
-        return INSTANCE;
+        instance.clear();
+        return instance;
     }
 
     private PacketByteBuffer() {

nms/v1_19_r1/src/main/java/me/filoghost/holographicdisplays/nms/v1_19_R1/PacketByteBuffer.java

@@ -12,13 +12,14 @@ import java.util.UUID;
 
 class PacketByteBuffer {
 
-    private static final PacketByteBuffer INSTANCE = new PacketByteBuffer();
+    private static final ThreadLocal<PacketByteBuffer> LOCAL_INSTANCE = ThreadLocal.withInitial(PacketByteBuffer::new);
 
     private final PacketDataSerializer serializer;
 
     static PacketByteBuffer get() {
-        INSTANCE.clear();
+        PacketByteBuffer instance = LOCAL_INSTANCE.get();
-        return INSTANCE;
+        instance.clear();
+        return instance;
     }
 
     private PacketByteBuffer() {

nms/v1_19_r2/src/main/java/me/filoghost/holographicdisplays/nms/v1_19_R2/PacketByteBuffer.java

@@ -12,13 +12,14 @@ import java.util.UUID;
 
 class PacketByteBuffer {
 
-    private static final PacketByteBuffer INSTANCE = new PacketByteBuffer();
+    private static final ThreadLocal<PacketByteBuffer> LOCAL_INSTANCE = ThreadLocal.withInitial(PacketByteBuffer::new);
 
     private final PacketDataSerializer serializer;
 
     static PacketByteBuffer get() {
-        INSTANCE.clear();
+        PacketByteBuffer instance = LOCAL_INSTANCE.get();
-        return INSTANCE;
+        instance.clear();
+        return instance;
     }
 
     private PacketByteBuffer() {

nms/v1_19_r3/src/main/java/me/filoghost/holographicdisplays/nms/v1_19_R3/PacketByteBuffer.java

@@ -12,13 +12,14 @@ import java.util.UUID;
 
 class PacketByteBuffer {
 
-    private static final PacketByteBuffer INSTANCE = new PacketByteBuffer();
+    private static final ThreadLocal<PacketByteBuffer> LOCAL_INSTANCE = ThreadLocal.withInitial(PacketByteBuffer::new);
 
     private final PacketDataSerializer serializer;
 
     static PacketByteBuffer get() {
-        INSTANCE.clear();
+        PacketByteBuffer instance = LOCAL_INSTANCE.get();
-        return INSTANCE;
+        instance.clear();
+        return instance;
     }
 
     private PacketByteBuffer() {

nms/v1_20_r1/src/main/java/me/filoghost/holographicdisplays/nms/v1_20_R1/PacketByteBuffer.java

@@ -12,13 +12,14 @@ import java.util.UUID;
 
 class PacketByteBuffer {
 
-    private static final PacketByteBuffer INSTANCE = new PacketByteBuffer();
+    private static final ThreadLocal<PacketByteBuffer> LOCAL_INSTANCE = ThreadLocal.withInitial(PacketByteBuffer::new);
 
     private final PacketDataSerializer serializer;
 
     static PacketByteBuffer get() {
-        INSTANCE.clear();
+        PacketByteBuffer instance = LOCAL_INSTANCE.get();
-        return INSTANCE;
+        instance.clear();
+        return instance;
     }
 
     private PacketByteBuffer() {

nms/v1_20_r2/src/main/java/me/filoghost/holographicdisplays/nms/v1_20_R2/PacketByteBuffer.java

@@ -12,13 +12,14 @@ import java.util.UUID;
 
 class PacketByteBuffer {
 
-    private static final PacketByteBuffer INSTANCE = new PacketByteBuffer();
+    private static final ThreadLocal<PacketByteBuffer> LOCAL_INSTANCE = ThreadLocal.withInitial(PacketByteBuffer::new);
 
     private final PacketDataSerializer serializer;
 
     static PacketByteBuffer get() {
-        INSTANCE.clear();
+        PacketByteBuffer instance = LOCAL_INSTANCE.get();
-        return INSTANCE;
+        instance.clear();
+        return instance;
     }
 
     private PacketByteBuffer() {

nms/v1_20_r3/src/main/java/me/filoghost/holographicdisplays/nms/v1_20_R3/PacketByteBuffer.java

@@ -12,13 +12,14 @@ import java.util.UUID;
 
 class PacketByteBuffer {
 
-    private static final PacketByteBuffer INSTANCE = new PacketByteBuffer();
+    private static final ThreadLocal<PacketByteBuffer> LOCAL_INSTANCE = ThreadLocal.withInitial(PacketByteBuffer::new);
 
     private final PacketDataSerializer serializer;
 
     static PacketByteBuffer get() {
-        INSTANCE.clear();
+        PacketByteBuffer instance = LOCAL_INSTANCE.get();
-        return INSTANCE;
+        instance.clear();
+        return instance;
     }
 
     private PacketByteBuffer() {

nms/v1_8_r3/src/main/java/me/filoghost/holographicdisplays/nms/v1_8_R3/PacketByteBuffer.java

@@ -14,13 +14,14 @@ import java.io.IOException;
 
 class PacketByteBuffer {
 
-    private static final PacketByteBuffer INSTANCE = new PacketByteBuffer();
+    private static final ThreadLocal<PacketByteBuffer> LOCAL_INSTANCE = ThreadLocal.withInitial(PacketByteBuffer::new);
 
     private final PacketDataSerializer serializer;
 
     static PacketByteBuffer get() {
-        INSTANCE.clear();
+        PacketByteBuffer instance = LOCAL_INSTANCE.get();
-        return INSTANCE;
+        instance.clear();
+        return instance;
     }
 
     private PacketByteBuffer() {

nms/v1_9_r2/src/main/java/me/filoghost/holographicdisplays/nms/v1_9_R2/PacketByteBuffer.java

@@ -14,13 +14,14 @@ import java.util.UUID;
 
 class PacketByteBuffer {
 
-    private static final PacketByteBuffer INSTANCE = new PacketByteBuffer();
+    private static final ThreadLocal<PacketByteBuffer> LOCAL_INSTANCE = ThreadLocal.withInitial(PacketByteBuffer::new);
 
     private final PacketDataSerializer serializer;
 
     static PacketByteBuffer get() {
-        INSTANCE.clear();
+        PacketByteBuffer instance = LOCAL_INSTANCE.get();
-        return INSTANCE;
+        instance.clear();
+        return instance;
     }
 
     private PacketByteBuffer() {