Added a simple membar

patches/server/0035-Pufferfish-Reduce-entity-allocations.patch

@@ -0,0 +1,31 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: MrHua269 <novau233@163.com>
+Date: Tue, 20 Feb 2024 13:11:11 +0000
+Subject: [PATCH] Pufferfish Reduce entity allocations
+
+
+diff --git a/src/main/java/net/minecraft/world/entity/ai/attributes/AttributeMap.java b/src/main/java/net/minecraft/world/entity/ai/attributes/AttributeMap.java
+index 9ef8f014af332da129bfcd3370da983ec035ecc6..bc178967affd21ad04b83ea26639a2dd9b497454 100644
+--- a/src/main/java/net/minecraft/world/entity/ai/attributes/AttributeMap.java
++++ b/src/main/java/net/minecraft/world/entity/ai/attributes/AttributeMap.java
+@@ -22,9 +22,11 @@ public class AttributeMap {
+     private final Map<Holder<Attribute>, AttributeInstance> attributes = new Object2ObjectOpenHashMap<>();
+     private final Set<AttributeInstance> dirtyAttributes = new ObjectOpenHashSet<>();
+     private final AttributeSupplier supplier;
++    private final java.util.function.Function<Holder<Attribute>, AttributeInstance> createInstance; // Pufferfish
+ 
+     public AttributeMap(AttributeSupplier defaultAttributes) {
+         this.supplier = defaultAttributes;
++        this.createInstance = attributex -> this.supplier.createInstance(this::onAttributeModified, attributex); // Pufferfish
+     }
+ 
+     private void onAttributeModified(AttributeInstance instance) {
+@@ -43,7 +45,7 @@ public class AttributeMap {
+ 
+     @Nullable
+     public AttributeInstance getInstance(Holder<Attribute> attribute) {
+-        return this.attributes.computeIfAbsent(attribute, attributex -> this.supplier.createInstance(this::onAttributeModified, attributex));
++        return this.attributes.computeIfAbsent(attribute, this.createInstance); // Pufferfish - cache lambda, as for some reason java allocates it anyways
+     }
+ 
+     public boolean hasAttribute(Holder<Attribute> attribute) {