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Firstly, the old methods all routed to the CompletableFuture method. However, the CF method could not guarantee that if the caller was off-main that the future would be "completed" on-main. Since the callback methods used the CF one, this meant that the callback methods did not guarantee that the callbacks were to be called on the main thread. Now, all methods route to getChunkAtAsync(x, z, gen, urgent, cb) so that the methods with the callback are guaranteed to invoke the callback on the main thread. The CF behavior remains unchanged; it may still appear to complete on main if invoked off-main. Secondly, remove the scheduleOnMain invocation in the async chunk completion. This unnecessarily delays the callback by 1 tick. Thirdly, add getChunksAtAsync(minX, minZ, maxX, maxZ, ...) which will load chunks within an area. This method is provided as a helper as keeping all chunks loaded within an area can be complicated to implement for plugins (due to the lacking ticket API), and is already implemented internally anyways. Fourthly, remove the ticket addition that occured with getChunkAt and getChunkAtAsync. The ticket addition may delay the unloading of the chunk unnecessarily. It also fixes a very rare timing bug where the future/callback would be completed after the chunk unloads.
41 lines
2.5 KiB
Diff
41 lines
2.5 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: etil2jz <blanchot.arthur@protonmail.ch>
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Date: Sat, 2 Apr 2022 23:29:24 +0200
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Subject: [PATCH] Fix NBT pieces overriding a block entity during worldgen
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deadlock
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By checking if the world passed into StructureTemplate's placeInWorld
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is not a WorldGenRegion, we can bypass the deadlock entirely.
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See https://bugs.mojang.com/browse/MC-246262
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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
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index b120949667ae0169a667b329b3cabbd79a0a5bda..734f511d197bc6bf2b02588069eb02c0224781f5 100644
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--- a/src/main/java/net/minecraft/world/level/levelgen/structure/templatesystem/StructureTemplate.java
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+++ b/src/main/java/net/minecraft/world/level/levelgen/structure/templatesystem/StructureTemplate.java
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@@ -303,7 +303,11 @@ public class StructureTemplate {
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if (definedstructure_blockinfo.nbt != null) {
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tileentity = world.getBlockEntity(blockposition2);
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- Clearable.tryClear(tileentity);
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+ // Paper start - Fix NBT pieces overriding a block entity during worldgen deadlock
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+ if (!(world instanceof net.minecraft.world.level.WorldGenLevel)) {
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+ Clearable.tryClear(tileentity);
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+ }
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+ // Paper end - Fix NBT pieces overriding a block entity during worldgen deadlock
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world.setBlock(blockposition2, Blocks.BARRIER.defaultBlockState(), 20);
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}
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// CraftBukkit start
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@@ -430,7 +434,11 @@ public class StructureTemplate {
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if (pair1.getSecond() != null) {
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tileentity = world.getBlockEntity(blockposition6);
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if (tileentity != null) {
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- tileentity.setChanged();
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+ // Paper start - Fix NBT pieces overriding a block entity during worldgen deadlock
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+ if (!(world instanceof net.minecraft.world.level.WorldGenLevel)) {
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+ tileentity.setChanged();
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+ }
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+ // Paper end - Fix NBT pieces overriding a block entity during worldgen deadlock
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}
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}
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}
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