From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: miclebrick <miclebrick@outlook.com>
Date: Thu, 6 Dec 2018 19:52:50 -0500
Subject: [PATCH] Cache block data strings


diff --git a/src/main/java/net/minecraft/server/MinecraftServer.java b/src/main/java/net/minecraft/server/MinecraftServer.java
index 1be085de963e1c4e5b5b1902f8dc46b120846226..ad234d7d364706e40d2965ea1f3ee57b3c058bdc 100644
--- a/src/main/java/net/minecraft/server/MinecraftServer.java
+++ b/src/main/java/net/minecraft/server/MinecraftServer.java
@@ -2228,6 +2228,7 @@ public abstract class MinecraftServer extends ReentrantBlockableEventLoop<TickTa
             this.functionManager.replaceLibrary(this.resources.managers.getFunctionLibrary());
             this.structureTemplateManager.onResourceManagerReload(this.resources.resourceManager);
             this.fuelValues = FuelValues.vanillaBurnTimes(this.registries.compositeAccess(), this.worldData.enabledFeatures());
+            org.bukkit.craftbukkit.block.data.CraftBlockData.reloadCache(); // Paper - cache block data strings; they can be defined by datapacks so refresh it here
         }, this);
 
         if (this.isSameThread()) {
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 c53dbcfde62ae8e2f019e854c336ce4a60346dc9..f73858663162cb594db382d584b6500bb03e74b1 100644
--- a/src/main/java/org/bukkit/craftbukkit/block/data/CraftBlockData.java
+++ b/src/main/java/org/bukkit/craftbukkit/block/data/CraftBlockData.java
@@ -156,7 +156,7 @@ public class CraftBlockData implements BlockData {
         return exactMatch;
     }
 
-    private static final Map<Class<? extends Enum<?>>, Enum<?>[]> ENUM_VALUES = new HashMap<>();
+    private static final Map<Class<? extends Enum<?>>, Enum<?>[]> ENUM_VALUES = new java.util.concurrent.ConcurrentHashMap<>(); // Paper - cache block data strings; make thread safe
 
     /**
      * Convert an NMS Enum (usually a BlockStateEnum) to its appropriate Bukkit
@@ -543,7 +543,38 @@ public class CraftBlockData implements BlockData {
         Preconditions.checkState(CraftBlockData.MAP.put(nms, bukkit) == null, "Duplicate mapping %s->%s", nms, bukkit);
     }
 
+    // Paper start - cache block data strings
+    private static Map<String, CraftBlockData> stringDataCache = new java.util.concurrent.ConcurrentHashMap<>();
+
+    static {
+        // cache all of the default states at startup, will not cache ones with the custom states inside of the
+        // brackets in a different order, though
+        reloadCache();
+    }
+
+    public static void reloadCache() {
+        stringDataCache.clear();
+        Block.BLOCK_STATE_REGISTRY.forEach(blockData -> stringDataCache.put(blockData.toString(), blockData.createCraftBlockData()));
+    }
+    // Paper end - cache block data strings
+
     public static CraftBlockData newData(BlockType blockType, String data) {
+
+        // Paper start - cache block data strings
+        if (blockType != null) {
+            Block block = CraftBlockType.bukkitToMinecraftNew(blockType);
+            if (block != null) {
+                net.minecraft.resources.ResourceLocation key = BuiltInRegistries.BLOCK.getKey(block);
+                data = data == null ? key.toString() : key + data;
+            }
+        }
+
+        CraftBlockData cached = stringDataCache.computeIfAbsent(data, s -> createNewData(null, s));
+        return (CraftBlockData) cached.clone();
+    }
+
+    private static CraftBlockData createNewData(BlockType blockType, String data) {
+        // Paper end - cache block data strings
         net.minecraft.world.level.block.state.BlockState blockData;
         Block block = blockType == null ? null : ((CraftBlockType<?>) blockType).getHandle();
         Map<Property<?>, Comparable<?>> parsed = null;