Leaf/leaf-server/paper-patches/features/0015-Reduce-array-allocations.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Martijn Muijsers <martijnmuijsers@live.nl>
Date: Sat, 26 Nov 2022 11:25:45 +0100
Subject: [PATCH] Reduce array allocations

License: GPL-3.0 (https://www.gnu.org/licenses/gpl-3.0.html)
Gale - https://galemc.org

This patch is based on the following patch:
"reduce allocs"
By: Simon Gardling <titaniumtown@gmail.com>
As part of: JettPack (https://gitlab.com/Titaniumtown/JettPack)
Licensed under: GPL-3.0 (https://www.gnu.org/licenses/gpl-3.0.html)

diff --git a/src/main/java/ca/spottedleaf/moonrise/common/list/EntityList.java b/src/main/java/ca/spottedleaf/moonrise/common/list/EntityList.java
index 7fed43a1e7bcf35c4d7fd3224837a47fedd59860..adc47f1ca3580a6968d145239ae830734a0ebe4a 100644
--- a/src/main/java/ca/spottedleaf/moonrise/common/list/EntityList.java
+++ b/src/main/java/ca/spottedleaf/moonrise/common/list/EntityList.java
@@ -18,9 +18,7 @@ public final class EntityList implements Iterable<Entity> {
         this.entityToIndex.defaultReturnValue(Integer.MIN_VALUE);
     }
 
-    private static final Entity[] EMPTY_LIST = new Entity[0];
-
-    private Entity[] entities = EMPTY_LIST;
+    private Entity[] entities = me.titaniumtown.ArrayConstants.emptyEntityArray; // Gale - JettPack - reduce array allocations
     private int count;
 
     public int size() {
diff --git a/src/main/java/ca/spottedleaf/moonrise/common/list/IntList.java b/src/main/java/ca/spottedleaf/moonrise/common/list/IntList.java
index 9f3b25bb2439f283f878db93973a02fcdcd14eed..4eb7bf187276f07f807fe181b303dda8e1b9196d 100644
--- a/src/main/java/ca/spottedleaf/moonrise/common/list/IntList.java
+++ b/src/main/java/ca/spottedleaf/moonrise/common/list/IntList.java
@@ -10,9 +10,7 @@ public final class IntList {
         this.map.defaultReturnValue(Integer.MIN_VALUE);
     }
 
-    private static final int[] EMPTY_LIST = new int[0];
-
-    private int[] byIndex = EMPTY_LIST;
+    private int[] byIndex = me.titaniumtown.ArrayConstants.emptyIntArray; // Gale - JettPack - reduce array allocations
     private int count;
 
     public int size() {
diff --git a/src/main/java/ca/spottedleaf/moonrise/common/list/ReferenceList.java b/src/main/java/ca/spottedleaf/moonrise/common/list/ReferenceList.java
index 2e876b918672e8ef3b5197b7e6b1597247fdeaa1..8df9406b77eb3c225ebf88bf76a7adb666452f3b 100644
--- a/src/main/java/ca/spottedleaf/moonrise/common/list/ReferenceList.java
+++ b/src/main/java/ca/spottedleaf/moonrise/common/list/ReferenceList.java
@@ -7,14 +7,12 @@ import java.util.NoSuchElementException;
 
 public final class ReferenceList<E> implements Iterable<E> {
 
-    private static final Object[] EMPTY_LIST = new Object[0];
-
     private final Reference2IntOpenHashMap<E> referenceToIndex;
     private E[] references;
     private int count;
 
     public ReferenceList() {
-        this((E[])EMPTY_LIST);
+        this((E[]) me.titaniumtown.ArrayConstants.emptyObjectArray); // Gale - JettPack - reduce array allocations
     }
 
     public ReferenceList(final E[] referenceArray) {
diff --git a/src/main/java/ca/spottedleaf/moonrise/common/list/ShortList.java b/src/main/java/ca/spottedleaf/moonrise/common/list/ShortList.java
index 2bae9949ef325d0001aa638150fbbdf968367e75..a72d5db6f6a8667c5c839016033bba4d0f16cf13 100644
--- a/src/main/java/ca/spottedleaf/moonrise/common/list/ShortList.java
+++ b/src/main/java/ca/spottedleaf/moonrise/common/list/ShortList.java
@@ -10,9 +10,7 @@ public final class ShortList {
         this.map.defaultReturnValue(Short.MIN_VALUE);
     }
 
-    private static final short[] EMPTY_LIST = new short[0];
-
-    private short[] byIndex = EMPTY_LIST;
+    private short[] byIndex = me.titaniumtown.ArrayConstants.emptyShortArray; // Gale - JettPack - reduce array allocations
     private short count;
 
     public int size() {
diff --git a/src/main/java/ca/spottedleaf/moonrise/common/list/SortedList.java b/src/main/java/ca/spottedleaf/moonrise/common/list/SortedList.java
index db92261a6cb3758391108361096417c61bc82cdc..1a14fddb36ca3c14d243304db629d0c5aac3906c 100644
--- a/src/main/java/ca/spottedleaf/moonrise/common/list/SortedList.java
+++ b/src/main/java/ca/spottedleaf/moonrise/common/list/SortedList.java
@@ -6,14 +6,12 @@ import java.util.Comparator;
 
 public final class SortedList<E> {
 
-    private static final Object[] EMPTY_LIST = new Object[0];
-
     private Comparator<? super E> comparator;
     private E[] elements;
     private int count;
 
     public SortedList(final Comparator<? super E> comparator) {
-        this((E[])EMPTY_LIST, comparator);
+        this((E[]) me.titaniumtown.ArrayConstants.emptyObjectArray, comparator); // Gale - JettPack - reduce array allocations
     }
 
     public SortedList(final E[] elements, final Comparator<? super E> comparator) {
diff --git a/src/main/java/io/papermc/paper/command/brigadier/PaperCommands.java b/src/main/java/io/papermc/paper/command/brigadier/PaperCommands.java
index 4b6d845423ca845cb8780499757d627773c688da..9c2864675bc0b13ba088ba699be3c5692c2fa0a4 100644
--- a/src/main/java/io/papermc/paper/command/brigadier/PaperCommands.java
+++ b/src/main/java/io/papermc/paper/command/brigadier/PaperCommands.java
@@ -175,7 +175,7 @@ public class PaperCommands implements Commands, PaperRegistrar<LifecycleEventOwn
                     })
             )
             .executes((stack) -> {
-                basicCommand.execute(stack.getSource(), new String[0]);
+                basicCommand.execute(stack.getSource(), me.titaniumtown.ArrayConstants.emptyStringArray); // Gale - JettPack - reduce array allocations
                 return com.mojang.brigadier.Command.SINGLE_SUCCESS;
             });
 
diff --git a/src/main/java/io/papermc/paper/command/subcommands/VersionCommand.java b/src/main/java/io/papermc/paper/command/subcommands/VersionCommand.java
index 58ca24715eafd1ac3cc9657b1cc235049d69bb59..acb764b71bb3e8f159a758002f7d1077637d188d 100644
--- a/src/main/java/io/papermc/paper/command/subcommands/VersionCommand.java
+++ b/src/main/java/io/papermc/paper/command/subcommands/VersionCommand.java
@@ -14,7 +14,7 @@ public final class VersionCommand implements PaperSubcommand {
     public boolean execute(final CommandSender sender, final String subCommand, final String[] args) {
         final @Nullable Command redirect = MinecraftServer.getServer().server.getCommandMap().getCommand("version");
         if (redirect != null) {
-            redirect.execute(sender, "paper", new String[0]);
+            redirect.execute(sender, "paper", me.titaniumtown.ArrayConstants.emptyStringArray); // Gale - JettPack - reduce array allocations
         }
         return true;
     }
diff --git a/src/main/java/org/bukkit/craftbukkit/inventory/CraftEntityEquipment.java b/src/main/java/org/bukkit/craftbukkit/inventory/CraftEntityEquipment.java
index 4abe58077fae4e68cceda9624fed013bca1d6f22..72aa906ccf64dd9be085728a897f323ab0822eba 100644
--- a/src/main/java/org/bukkit/craftbukkit/inventory/CraftEntityEquipment.java
+++ b/src/main/java/org/bukkit/craftbukkit/inventory/CraftEntityEquipment.java
@@ -165,7 +165,7 @@ public class CraftEntityEquipment implements EntityEquipment {
 
     @Override
     public void clear() {
-        for (net.minecraft.world.entity.EquipmentSlot slot : net.minecraft.world.entity.EquipmentSlot.values()) {
+        for (net.minecraft.world.entity.EquipmentSlot slot : net.minecraft.world.entity.EquipmentSlot.VALUES) { // Gale - JettPack - reduce array allocations
             this.setEquipment(slot, null, false);
         }
     }
diff --git a/src/main/java/org/bukkit/craftbukkit/util/WeakCollection.java b/src/main/java/org/bukkit/craftbukkit/util/WeakCollection.java
index 306ca8db11d16a03ce73b9a5a8be7efc11ee4b57..444e57a87acb653275d1cadbd0698815f6dc049d 100644
--- a/src/main/java/org/bukkit/craftbukkit/util/WeakCollection.java
+++ b/src/main/java/org/bukkit/craftbukkit/util/WeakCollection.java
@@ -164,7 +164,7 @@ public final class WeakCollection<E> implements Collection<E> {
 
     @Override
     public Object[] toArray() {
-        return this.toArray(new Object[0]);
+        return this.toArray(me.titaniumtown.ArrayConstants.emptyObjectArray); // Gale - JettPack - reduce array allocations
     }
 
     @Override