Paper/patches/server/0839-Use-a-CHM-for-StructureTemplate.Pallete-cache.patch

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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Shane Freeder <theboyetronic@gmail.com>
Date: Mon, 12 Jul 2021 12:28:29 +0100
Subject: [PATCH] Use a CHM for StructureTemplate.Pallete cache
fixes a CME due to this collection being shared across threads
diff --git a/src/main/java/net/minecraft/world/level/levelgen/structure/templatesystem/StructureTemplate.java b/src/main/java/net/minecraft/world/level/levelgen/structure/templatesystem/StructureTemplate.java
index f3fcd345178efd4917ef79cb141275a987f99e58..fcd6b2a438ffc2f039036a45ff88ba46017981f7 100644
--- a/src/main/java/net/minecraft/world/level/levelgen/structure/templatesystem/StructureTemplate.java
+++ b/src/main/java/net/minecraft/world/level/levelgen/structure/templatesystem/StructureTemplate.java
@@ -831,7 +831,7 @@ public class StructureTemplate {
public static final class Palette {
private final List<StructureTemplate.StructureBlockInfo> blocks;
- private final Map<Block, List<StructureTemplate.StructureBlockInfo>> cache = Maps.newHashMap();
+ private final Map<Block, List<StructureTemplate.StructureBlockInfo>> cache = Maps.newConcurrentMap(); // Paper
Palette(List<StructureTemplate.StructureBlockInfo> infos) {
this.blocks = infos;