From fc57ac7c185f3eb5c2805f25344b868babeb5310 Mon Sep 17 00:00:00 2001
From: tr7zw <tr7zw@live.de>
Date: Thu, 25 Jun 2020 23:40:12 +0200
Subject: [PATCH] Heavily optimize furnance fuel and recipe lookups

---
 .../net/minecraft/server/CraftingManager.java |  7 ++++++
 .../minecraft/server/TileEntityFurnace.java   | 22 +++++++++++++++++++
 2 files changed, 29 insertions(+)

diff --git a/src/main/java/net/minecraft/server/CraftingManager.java b/src/main/java/net/minecraft/server/CraftingManager.java
index 15e2439d6..e226e0069 100644
--- a/src/main/java/net/minecraft/server/CraftingManager.java
+++ b/src/main/java/net/minecraft/server/CraftingManager.java
@@ -87,6 +87,13 @@ public class CraftingManager extends ResourceDataJson {
 
     public <C extends IInventory, T extends IRecipe<C>> Optional<T> craft(Recipes<T> recipes, C c0, World world) {
         // YAPFA start
+    	if(c0.getCurrentRecipe() != null) {
+    		Optional<T> optional = recipes.a(c0.getCurrentRecipe(), world, c0);
+        	if(optional.isPresent()) {
+		        c0.setCurrentRecipe(optional.get());
+        		return optional;
+        	}
+    	}
         for(IRecipe<C> rep : this.a(recipes).values()) {
         	Optional<T> optional = recipes.a(rep, world, c0);
         	if(optional.isPresent()) {
diff --git a/src/main/java/net/minecraft/server/TileEntityFurnace.java b/src/main/java/net/minecraft/server/TileEntityFurnace.java
index 7d50b7056..9299148a8 100644
--- a/src/main/java/net/minecraft/server/TileEntityFurnace.java
+++ b/src/main/java/net/minecraft/server/TileEntityFurnace.java
@@ -97,7 +97,13 @@ public abstract class TileEntityFurnace extends TileEntityContainer implements I
         this.c = recipes;
     }
 
+    //YAPFA
+    private static Map<Item, Integer> cachedFuelMap = null;
+    
     public static Map<Item, Integer> f() {
+    	if(cachedFuelMap != null) {
+    		return cachedFuelMap; // YAPFA
+    	}
         Map<Item, Integer> map = Maps.newLinkedHashMap();
 
         a(map, (IMaterial) Items.LAVA_BUCKET, 20000);
@@ -160,6 +166,7 @@ public abstract class TileEntityFurnace extends TileEntityContainer implements I
         a(map, (IMaterial) Blocks.FLETCHING_TABLE, 300);
         a(map, (IMaterial) Blocks.SMITHING_TABLE, 300);
         a(map, (IMaterial) Blocks.COMPOSTER, 300);
+        cachedFuelMap = map; // YAPFA
         return map;
     }
 
@@ -594,4 +601,19 @@ public abstract class TileEntityFurnace extends TileEntityContainer implements I
         }
 
     }
+    
+     // YAPFA start
+    private IRecipe cachedRecipe = null;
+    @Override
+    public IRecipe getCurrentRecipe() {
+        return cachedRecipe;
+    }
+    @Override
+    public void setCurrentRecipe(IRecipe recipe) {
+    	cachedRecipe = recipe;
+    }
+
+    
+    // YAPFA end
+    
 }
-- 
2.25.1.windows.1