From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Sotr <i@omc.hk>
Date: Wed, 15 Apr 2020 04:28:25 +0700
Subject: [PATCH] Cache hashcode for BlockPosition


diff --git a/src/main/java/net/minecraft/server/BaseBlockPosition.java b/src/main/java/net/minecraft/server/BaseBlockPosition.java
index a0450a7ddf21659c5636b3f298e6bf4f0a93fc4d..c4227ff056f906c6ea1fec0330d2db84409a6482 100644
--- a/src/main/java/net/minecraft/server/BaseBlockPosition.java
+++ b/src/main/java/net/minecraft/server/BaseBlockPosition.java
@@ -19,6 +19,7 @@ public class BaseBlockPosition implements Comparable<BaseBlockPosition> {
         return y < 0 || y >= 256;
     }
     // Paper end
+    protected int hash; // Akarin - cache hashcode
 
     public BaseBlockPosition(int i, int j, int k) {
         this.x = i;
@@ -43,8 +44,20 @@ public class BaseBlockPosition implements Comparable<BaseBlockPosition> {
     }
 
     public final int hashCode() { // Paper
-        return (this.y + this.z * 31) * 31 + this.x; // Paper
+        // Akarin start - cache hashcode
+        int result = hash; // Make the situation not too bad when it is modified by multiple threads
+        if (result == 0) {
+          result = (this.y + this.z * 31) * 31 + this.x; // Paper
+          hash = result;
+        }
+        return result;
+        // return (this.getY() + this.getZ() * 31) * 31 + this.getX();
+    }
+
+    public final void recalcHashCode() {
+      hash = 0;
     }
+    // Akarin end
 
     public int compareTo(BaseBlockPosition baseblockposition) {
         return this.getY() == baseblockposition.getY() ? (this.getZ() == baseblockposition.getZ() ? this.getX() - baseblockposition.getX() : this.getZ() - baseblockposition.getZ()) : this.getY() - baseblockposition.getY();
diff --git a/src/main/java/net/minecraft/server/BlockPosition.java b/src/main/java/net/minecraft/server/BlockPosition.java
index 3bf17ccdaef21322b787db538d569e0bc614ef22..349cd6b2b11f1ff28cfa5504cd14fe23583d4b56 100644
--- a/src/main/java/net/minecraft/server/BlockPosition.java
+++ b/src/main/java/net/minecraft/server/BlockPosition.java
@@ -441,6 +441,7 @@ public class BlockPosition extends BaseBlockPosition implements MinecraftSeriali
             this.y = j;
             this.z = k;
             // Paper end
+            this.recalcHashCode(); // Akarin - cache hashcode
             return this;
         }
 
@@ -481,16 +482,19 @@ public class BlockPosition extends BaseBlockPosition implements MinecraftSeriali
         public final void setX(final int x) { this.o(x); } // Paper - OBFHELPER
         public void o(int i) {
             this.x = i; // Paper change to x
+            this.recalcHashCode(); // Akarin - cache hashcode
         }
 
         public final void setY(final int y) { this.p(y); } // Paper - OBFHELPER
         public void p(int i) {
             this.y = i; // Paper change to y
+            this.recalcHashCode(); // Akarin - cache hashcode
         }
 
         public final void setZ(final int z) { this.q(z); } // Paper - OBFHELPER
         public void q(int i) {
             this.z = i; // Paper change to z
+            this.recalcHashCode(); // Akarin - cache hashcode
         }
 
         @Override