Paper/patches/server/0247-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 5bba39a066ede470cebc92724735c86ecfd4239d..c53b80cba9ea658d20e527a9bfcd6b5d7d9f51fc 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
@@ -728,6 +728,14 @@ public abstract class BlockBehaviour implements FeatureElement {
             this.spawnParticlesOnBreak = blockbase_info.spawnParticlesOnBreak;
             this.conditionallyFullOpaque = this.isOpaque() & this.isTransparentOnSomeFaces(); // Paper
         }
+        // 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 953fe30e445885809caa16161262089a7786057b..6182ce8c32a334d3488c03f42bf3befcc0b80503 100644
--- a/src/main/java/org/bukkit/craftbukkit/block/data/CraftBlockData.java
+++ b/src/main/java/org/bukkit/craftbukkit/block/data/CraftBlockData.java
@@ -542,7 +542,17 @@ 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);
     }