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Remove wall-time / unused skip tick protection (#11412)

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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.
This commit is contained in:
Bjarne Koll 2024-09-19 16:36:07 +02:00 • committed by GitHub
parent 5c82955733
commit c5a10665b8
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GPG key ID: B5690EEEBB952194
794 changed files with 402 additions and 282 deletions
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patches/server/0678-Make-some-itemstacks-nonnull.patch Normal file
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@ -0,0 +1,28 @@
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Jake Potrebic <jake.m.potrebic@gmail.com>
Date: Tue, 15 Mar 2022 01:38:15 -0700
Subject: [PATCH] Make some itemstacks nonnull
diff --git a/src/main/java/org/bukkit/craftbukkit/inventory/CraftInventoryPlayer.java b/src/main/java/org/bukkit/craftbukkit/inventory/CraftInventoryPlayer.java
index 972fe4237461f07f78b60845b2ebfefb06698ded..9d74577af071954e1e37201a96368c1360076209 100644
--- a/src/main/java/org/bukkit/craftbukkit/inventory/CraftInventoryPlayer.java
+++ b/src/main/java/org/bukkit/craftbukkit/inventory/CraftInventoryPlayer.java
@@ -155,13 +155,13 @@ public class CraftInventoryPlayer extends CraftInventory implements org.bukkit.i
case OFF_HAND:
return this.getItemInOffHand();
case FEET:
- return this.getBoots();
+ return java.util.Objects.requireNonNullElseGet(this.getBoots(), () -> new ItemStack(org.bukkit.Material.AIR)); // Paper - make nonnull
case LEGS:
- return this.getLeggings();
+ return java.util.Objects.requireNonNullElseGet(this.getLeggings(), () -> new ItemStack(org.bukkit.Material.AIR)); // Paper - make nonnull
case CHEST:
- return this.getChestplate();
+ return java.util.Objects.requireNonNullElseGet(this.getChestplate(), () -> new ItemStack(org.bukkit.Material.AIR)); // Paper - make nonnull
case HEAD:
- return this.getHelmet();
+ return java.util.Objects.requireNonNullElseGet(this.getHelmet(), () -> new ItemStack(org.bukkit.Material.AIR)); // Paper - make nonnull
default:
throw new IllegalArgumentException("Not implemented. This is a bug");
}