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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
No known key found for this signature in database
GPG key ID: B5690EEEBB952194
794 changed files with 402 additions and 282 deletions
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38
patches/server/0524-Add-EntityBlockStorage-clearEntities.patch Normal file
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@ -0,0 +1,38 @@
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Owen1212055 <23108066+Owen1212055@users.noreply.github.com>
Date: Mon, 5 Apr 2021 18:12:29 -0400
Subject: [PATCH] Add EntityBlockStorage#clearEntities()
diff --git a/src/main/java/net/minecraft/world/level/block/entity/BeehiveBlockEntity.java b/src/main/java/net/minecraft/world/level/block/entity/BeehiveBlockEntity.java
index b345403cdf5b2828f99708fef65136594a3331c3..ef8a0236ab4fb648c4bb2a8cfc90e3cefe8f9f1d 100644
--- a/src/main/java/net/minecraft/world/level/block/entity/BeehiveBlockEntity.java
+++ b/src/main/java/net/minecraft/world/level/block/entity/BeehiveBlockEntity.java
@@ -151,6 +151,11 @@ public class BeehiveBlockEntity extends BlockEntity {
return this.stored.size();
}
+ // Paper start - Add EntityBlockStorage clearEntities
+ public void clearBees() {
+ this.stored.clear();
+ }
+ // Paper end - Add EntityBlockStorage clearEntities
public static int getHoneyLevel(BlockState state) {
return (Integer) state.getValue(BeehiveBlock.HONEY_LEVEL);
}
diff --git a/src/main/java/org/bukkit/craftbukkit/block/CraftBeehive.java b/src/main/java/org/bukkit/craftbukkit/block/CraftBeehive.java
index fbacbef0dd51037fa0af56fedeea50a5c7bed8c7..1a2a05160ba51d9c75f1ae6ae61d944d81428722 100644
--- a/src/main/java/org/bukkit/craftbukkit/block/CraftBeehive.java
+++ b/src/main/java/org/bukkit/craftbukkit/block/CraftBeehive.java
@@ -95,4 +95,11 @@ public class CraftBeehive extends CraftBlockEntityState<BeehiveBlockEntity> impl
public CraftBeehive copy(Location location) {
return new CraftBeehive(this, location);
}
+
+ // Paper start - Add EntityBlockStorage clearEntities
+ @Override
+ public void clearEntities() {
+ getSnapshot().clearBees();
+ }
+ // Paper end
}