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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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46
patches/server/0477-Add-BlockPreDispenseEvent.patch Normal file
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@ -0,0 +1,46 @@
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Madeline Miller <mnmiller1@me.com>
Date: Sun, 17 Jan 2021 13:16:09 +1000
Subject: [PATCH] Add BlockPreDispenseEvent
diff --git a/src/main/java/net/minecraft/world/level/block/DispenserBlock.java b/src/main/java/net/minecraft/world/level/block/DispenserBlock.java
index 94bcbaf7daf7dfe566f508d1170a433930d9d49a..f6edfea463b3725d3a79aca38825e86dbf82175c 100644
--- a/src/main/java/net/minecraft/world/level/block/DispenserBlock.java
+++ b/src/main/java/net/minecraft/world/level/block/DispenserBlock.java
@@ -110,6 +110,7 @@ public class DispenserBlock extends BaseEntityBlock {
DispenseItemBehavior idispensebehavior = this.getDispenseMethod(world, itemstack);
if (idispensebehavior != DispenseItemBehavior.NOOP) {
+ if (!org.bukkit.craftbukkit.event.CraftEventFactory.handleBlockPreDispenseEvent(world, pos, itemstack, i)) return; // Paper - Add BlockPreDispenseEvent
DispenserBlock.eventFired = false; // CraftBukkit - reset event status
tileentitydispenser.setItem(i, idispensebehavior.dispense(sourceblock, itemstack));
}
diff --git a/src/main/java/net/minecraft/world/level/block/DropperBlock.java b/src/main/java/net/minecraft/world/level/block/DropperBlock.java
index 91b514967405115f22edf4255775361a672e5c2f..ddecf443df3679e3098eb54edd19585a0512e342 100644
--- a/src/main/java/net/minecraft/world/level/block/DropperBlock.java
+++ b/src/main/java/net/minecraft/world/level/block/DropperBlock.java
@@ -71,6 +71,7 @@ public class DropperBlock extends DispenserBlock {
ItemStack itemstack1;
if (iinventory == null) {
+ if (!org.bukkit.craftbukkit.event.CraftEventFactory.handleBlockPreDispenseEvent(world, pos, itemstack, i)) return; // Paper - Add BlockPreDispenseEvent
itemstack1 = DropperBlock.DISPENSE_BEHAVIOUR.dispense(sourceblock, itemstack);
} else {
// CraftBukkit start - Fire event when pushing items into other inventories
diff --git a/src/main/java/org/bukkit/craftbukkit/event/CraftEventFactory.java b/src/main/java/org/bukkit/craftbukkit/event/CraftEventFactory.java
index 9e67dc35ea12149265517b951a96828460b2ca67..251b605396b77b0c449972c1da75978f57587e1a 100644
--- a/src/main/java/org/bukkit/craftbukkit/event/CraftEventFactory.java
+++ b/src/main/java/org/bukkit/craftbukkit/event/CraftEventFactory.java
@@ -2134,5 +2134,11 @@ public class CraftEventFactory {
io.papermc.paper.event.block.BlockFailedDispenseEvent event = new io.papermc.paper.event.block.BlockFailedDispenseEvent(block);
return event.callEvent();
}
+
+ public static boolean handleBlockPreDispenseEvent(ServerLevel serverLevel, BlockPos pos, ItemStack itemStack, int slot) {
+ org.bukkit.block.Block block = CraftBlock.at(serverLevel, pos);
+ io.papermc.paper.event.block.BlockPreDispenseEvent event = new io.papermc.paper.event.block.BlockPreDispenseEvent(block, org.bukkit.craftbukkit.inventory.CraftItemStack.asCraftMirror(itemStack), slot);
+ return event.callEvent();
+ }
// Paper end
}