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34 lines
2.1 KiB
Diff
34 lines
2.1 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Spottedleaf <Spottedleaf@users.noreply.github.com>
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Date: Mon, 15 May 2023 00:20:59 -0700
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Subject: [PATCH] Fix concurrenct access to lookups field in RegistryOps
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The concurrent access occurs on the Netty IO threads when
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serializing packets. Thus, it seems it was an oversight of
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the implementator of this function as there are typically
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more than one Netty IO thread.
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Fixes https://github.com/PaperMC/Folia/issues/11
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diff --git a/src/main/java/net/minecraft/resources/RegistryOps.java b/src/main/java/net/minecraft/resources/RegistryOps.java
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index 7709eeac907c4895a264cec0a3d453aa8b194c18..c7cfc3ca58f9439142fe5828117f6d576d7df10e 100644
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--- a/src/main/java/net/minecraft/resources/RegistryOps.java
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+++ b/src/main/java/net/minecraft/resources/RegistryOps.java
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@@ -19,11 +19,14 @@ public class RegistryOps<T> extends DelegatingOps<T> {
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private static RegistryOps.RegistryInfoLookup memoizeLookup(final RegistryOps.RegistryInfoLookup registryInfoGetter) {
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return new RegistryOps.RegistryInfoLookup() {
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- private final Map<ResourceKey<? extends Registry<?>>, Optional<? extends RegistryOps.RegistryInfo<?>>> lookups = new HashMap<>();
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+ // The concurrent access occurs on the Netty IO threads when serializing packets.
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+ // Thus, it seems it was an oversight of the implementator of this function as there
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+ // are typically more than one Netty IO thread.
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+ private final Map<ResourceKey<? extends Registry<?>>, Optional<? extends RegistryOps.RegistryInfo<?>>> lookups = new java.util.concurrent.ConcurrentHashMap<>(); // Paper - fix concurrent access to lookups field
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@Override
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public <T> Optional<RegistryOps.RegistryInfo<T>> lookup(ResourceKey<? extends Registry<? extends T>> registryRef) {
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- return this.lookups.computeIfAbsent(registryRef, registryInfoGetter::lookup);
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+ return (Optional<RegistryOps.RegistryInfo<T>>)this.lookups.computeIfAbsent(registryRef, registryInfoGetter::lookup); // Paper - fix concurrent access to lookups field
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}
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};
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}
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