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8c5b837e05
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.
27 lines
1.5 KiB
Diff
27 lines
1.5 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: Tue, 8 Aug 2023 17:29:33 -0700
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Subject: [PATCH] Fix race condition on UpgradeData.BlockFixers class init
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The CHUNKY_FIXERS field is modified during the constructors
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of the BlockFixers, but the code that uses CHUNKY_FIXERS does
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not properly ensure that BlockFixers has been initialised before
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using it, leading to a possible race condition where instances of
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BlockFixers are accessed before they have initialised correctly.
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We can force the class to initialise fully before accessing the
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field by calling any method on the class, and for convenience
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we use values().
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diff --git a/src/main/java/net/minecraft/world/level/chunk/UpgradeData.java b/src/main/java/net/minecraft/world/level/chunk/UpgradeData.java
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index ce3d79ebc7f933d0b34b3f8f71bbec872076847a..ce84851c0c2bf9a066fd5e07be8635d3dcaea0b9 100644
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--- a/src/main/java/net/minecraft/world/level/chunk/UpgradeData.java
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+++ b/src/main/java/net/minecraft/world/level/chunk/UpgradeData.java
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@@ -153,6 +153,7 @@ public class UpgradeData {
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Fluid fluid = tick.type() == Fluids.EMPTY ? level.getFluidState(tick.pos()).getType() : tick.type();
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level.scheduleTick(tick.pos(), fluid, tick.delay(), tick.priority());
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});
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+ UpgradeData.BlockFixers.values(); // Paper - force the class init so that we don't access CHUNKY_FIXERS before all BlockFixers are initialised
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CHUNKY_FIXERS.forEach(logic -> logic.processChunk(level));
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}
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