From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: lukas <lukasalt98@gmail.com>
Date: Sun, 27 Dec 2020 16:47:00 +0100
Subject: [PATCH] Cache burn durations


diff --git a/src/main/java/net/minecraft/server/TileEntityFurnace.java b/src/main/java/net/minecraft/server/TileEntityFurnace.java
index 1d3c2dd93657fb5dc71ee6b444c585b54619d1e8..e75e676d196d9f5a3409ec50645fab611b0afdad 100644
--- a/src/main/java/net/minecraft/server/TileEntityFurnace.java
+++ b/src/main/java/net/minecraft/server/TileEntityFurnace.java
@@ -1,5 +1,6 @@
 package net.minecraft.server;
 
+import com.google.common.collect.ImmutableMap;
 import com.google.common.collect.Lists;
 import com.google.common.collect.Maps;
 import it.unimi.dsi.fastutil.objects.Object2IntMap.Entry;
@@ -83,7 +84,15 @@ public abstract class TileEntityFurnace extends TileEntityContainer implements I
         this.c = recipes;
     }
 
+    private static Map<Item, Integer> cachedBurnDurations = null; // Paper - cache burn durations
+
+    public static Map<Item, Integer> getBurnDurations() { return f(); } // Paper - OBFHELPER
     public static Map<Item, Integer> f() {
+        // Paper start - cache burn durations
+        if(cachedBurnDurations != null) {
+            return cachedBurnDurations;
+        }
+        // Paper end
         Map<Item, Integer> map = Maps.newLinkedHashMap();
 
         a(map, (IMaterial) Items.LAVA_BUCKET, 20000);
@@ -146,7 +155,10 @@ 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);
-        return map;
+        // Paper start - cache burn durations
+        cachedBurnDurations = ImmutableMap.copyOf(map);
+        return cachedBurnDurations;
+        // Paper end
     }
 
     // CraftBukkit start - add fields and methods
@@ -400,7 +412,7 @@ public abstract class TileEntityFurnace extends TileEntityContainer implements I
         } else {
             Item item = itemstack.getItem();
 
-            return (Integer) f().getOrDefault(item, 0);
+            return getBurnDurations().getOrDefault(item, 0); // Paper - cache burn durations
         }
     }
 
@@ -409,7 +421,7 @@ public abstract class TileEntityFurnace extends TileEntityContainer implements I
     }
 
     public static boolean isFuel(ItemStack itemstack) {
-        return f().containsKey(itemstack.getItem());
+        return getBurnDurations().containsKey(itemstack.getItem()); // Paper - cache burn durations
     }
 
     @Override