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Paper/patches/server/0742-Mitigate-effects-of-WorldCreator-keepSpawnLoaded-ret.patch
Bjarne Koll c5a10665b8
Remove wall-time / unused skip tick protection (#11412)
Spigot still maintains some partial implementation of "tick skipping", a
practice in which the MinecraftServer.currentTick field is updated not
by an increment of one per actual tick, but instead set to
System.currentTimeMillis() / 50. This behaviour means that the tracked
tick may "skip" a tick value in case a previous tick took more than the
expected 50ms.

To compensate for this in important paths, spigot/craftbukkit
implements "wall-time". Instead of incrementing/decrementing ticks on
block entities/entities by one for each call to their tick() method,
they instead increment/decrement important values, like
an ItemEntity's age or pickupDelay, by the difference of
`currentTick - lastTick`, where `lastTick` is the value of
`currentTick` during the last tick() call.

These "fixes" however do not play nicely with minecraft's simulation
distance as entities/block entities implementing the above behaviour
would "catch up" their values when moving from a non-ticking chunk to a
ticking one as their `lastTick` value remains stuck on the last tick in
a ticking chunk and hence lead to a large "catch up" once ticked again.

Paper completely removes the "tick skipping" behaviour (See patch
"Further-improve-server-tick-loop"), making the above precautions
completely unnecessary, which also rids paper of the previous described
incompatibility with non-ticking chunks.
2024-09-19 16:36:07 +02:00

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1.6 KiB
Diff

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Shane Freeder <theboyetronic@gmail.com>
Date: Mon, 19 Sep 2022 00:13:02 +0100
Subject: [PATCH] Mitigate effects of WorldCreator#keepSpawnLoaded ret type
change
TODO: Remove in 1.21?
diff --git a/src/main/java/org/bukkit/craftbukkit/util/Commodore.java b/src/main/java/org/bukkit/craftbukkit/util/Commodore.java
index 157fbe09ab22f3218d9d3f72e8c0a5a3d727eaeb..cae5c865388aca8041233ca52b25ecf68cd37494 100644
--- a/src/main/java/org/bukkit/craftbukkit/util/Commodore.java
+++ b/src/main/java/org/bukkit/craftbukkit/util/Commodore.java
@@ -440,6 +440,12 @@ public class Commodore {
super.visitMethodInsn(Opcodes.INVOKEVIRTUAL, runtimeCbPkgPrefix() + "advancement/CraftAdvancement", "getDisplay0", desc, false);
return;
}
+ if (owner.equals("org/bukkit/WorldCreator") && name.equals("keepSpawnLoaded") && desc.equals("(Lnet/kyori/adventure/util/TriState;)V")) {
+ super.visitMethodInsn(opcode, owner, name, "(Lnet/kyori/adventure/util/TriState;)Lorg/bukkit/WorldCreator;", itf);
+ // new method has a return, so, make sure we pop it
+ super.visitInsn(Opcodes.POP);
+ return;
+ }
// Paper end
// Paper start - ItemFactory#getSpawnEgg (paper had original method that returned ItemStack, upstream added identical but returned Material)