Paper/patches/server/0246-Optimize-CraftBlockData-Creation.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: miclebrick <miclebrick@outlook.com>
Date: Thu, 23 Aug 2018 11:45:32 -0400
Subject: [PATCH] Optimize CraftBlockData Creation

Avoids a hashmap lookup by cacheing a reference to the CraftBlockData
and cloning it when one is needed.

diff --git a/src/main/java/net/minecraft/world/level/block/state/BlockBehaviour.java b/src/main/java/net/minecraft/world/level/block/state/BlockBehaviour.java
index f0bd06ab32e99c188510b3c3fa41f1737ab4fe78..3ec96c7f2ad0d6ba8ad32a4aabb0292b5c2ff5b4 100644
--- a/src/main/java/net/minecraft/world/level/block/state/BlockBehaviour.java
+++ b/src/main/java/net/minecraft/world/level/block/state/BlockBehaviour.java
@@ -695,6 +695,14 @@ public abstract class BlockBehaviour {
             this.emissiveRendering = blockbase_info.emissiveRendering;
             this.offsetType = (BlockBehaviour.OffsetType) blockbase_info.offsetType.apply(this.asState());
         }
+        // Paper start - impl cached craft block data, lazy load to fix issue with loading at the wrong time
+        private org.bukkit.craftbukkit.block.data.CraftBlockData cachedCraftBlockData;
+
+        public org.bukkit.craftbukkit.block.data.CraftBlockData createCraftBlockData() {
+            if (cachedCraftBlockData == null) cachedCraftBlockData = org.bukkit.craftbukkit.block.data.CraftBlockData.createData(asState());
+            return (org.bukkit.craftbukkit.block.data.CraftBlockData) cachedCraftBlockData.clone();
+        }
+        // Paper end
 
         // Paper start
         protected boolean shapeExceedsCube = true;
diff --git a/src/main/java/org/bukkit/craftbukkit/block/data/CraftBlockData.java b/src/main/java/org/bukkit/craftbukkit/block/data/CraftBlockData.java
index 8a4dcbbfdc4ef9f7fcd1eb04db010f93f5f06933..514e1ab74cd24cfcf1dd031e69a8ebfaddf9d3dc 100644
--- a/src/main/java/org/bukkit/craftbukkit/block/data/CraftBlockData.java
+++ b/src/main/java/org/bukkit/craftbukkit/block/data/CraftBlockData.java
@@ -539,7 +539,17 @@ public class CraftBlockData implements BlockData {
         return craft;
     }
 
+    // Paper start - optimize creating BlockData to not need a map lookup
+    static {
+        // Initialize cached data for all IBlockData instances after registration
+        Block.BLOCK_STATE_REGISTRY.iterator().forEachRemaining(BlockState::createCraftBlockData);
+    }
     public static CraftBlockData fromData(BlockState data) {
+        return data.createCraftBlockData();
+    }
+
+    public static CraftBlockData createData(BlockState data) {
+        // Paper end
         return CraftBlockData.MAP.getOrDefault(data.getBlock().getClass(), CraftBlockData::new).apply(data);
     }