From c85ad1cb28ff05d7f73864887652b8765c08feda 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/server/IBlockData.java b/src/main/java/net/minecraft/server/IBlockData.java
index 862ae25544..d25989d514 100644
--- a/src/main/java/net/minecraft/server/IBlockData.java
+++ b/src/main/java/net/minecraft/server/IBlockData.java
@@ -4,6 +4,8 @@ import com.google.common.collect.ImmutableMap;
 import com.mojang.datafixers.Dynamic;
 import com.mojang.datafixers.types.DynamicOps;
 import com.mojang.datafixers.util.Pair;
+import org.bukkit.craftbukkit.block.data.CraftBlockData;
+
 import java.util.Arrays;
 import java.util.Iterator;
 import java.util.List;
@@ -38,6 +40,15 @@ public class IBlockData extends BlockDataAbstract<Block, IBlockData> implements
         return (Block) this.a;
     }
 
+    // Paper start - impl cached craft block data, lazy load to fix issue with loading at the wrong time
+    private CraftBlockData cachedCraftBlockData;
+
+    public CraftBlockData createCraftBlockData() {
+        if(cachedCraftBlockData == null) cachedCraftBlockData = CraftBlockData.createData(this);
+        return (CraftBlockData) cachedCraftBlockData.clone();
+    }
+    // Paper end
+
     public Material getMaterial() {
         return this.getBlock().l(this);
     }
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 c1666a9baf..3c29abd525 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.REGISTRY_ID.iterator().forEachRemaining(IBlockData::createCraftBlockData);
+    }
     public static CraftBlockData fromData(IBlockData data) {
+        return data.createCraftBlockData();
+    }
+
+    public static CraftBlockData createData(IBlockData data) {
+        // Paper end
         return MAP.getOrDefault(data.getBlock().getClass(), CraftBlockData::new).apply(data);
     }
 }
-- 
2.22.0