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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.
163 lines
9.1 KiB
Diff
163 lines
9.1 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Bjarne Koll <lynxplay101@gmail.com>
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Date: Mon, 16 Sep 2024 23:07:29 +0200
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Subject: [PATCH] Remove wall-time / unused skip tick protection
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Spigot still maintains some partial implementation of "tick skipping", a
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practice in which the MinecraftServer.currentTick field is updated not
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by an increment of one per actual tick, but instead set to
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System.currentTimeMillis() / 50. This behaviour means that the tracked
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tick may "skip" a tick value in case a previous tick took more than the
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expected 50ms.
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To compensate for this in important paths, spigot/craftbukkit
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implements "wall-time". Instead of incrementing/decrementing ticks on
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block entities/entities by one for each call to their tick() method,
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they instead increment/decrement important values, like
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an ItemEntity's age or pickupDelay, by the difference of
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`currentTick - lastTick`, where `lastTick` is the value of
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`currentTick` during the last tick() call.
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These "fixes" however do not play nicely with minecraft's simulation
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distance as entities/block entities implementing the above behaviour
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would "catch up" their values when moving from a non-ticking chunk to a
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ticking one as their `lastTick` value remains stuck on the last tick in
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a ticking chunk and hence lead to a large "catch up" once ticked again.
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Paper completely removes the "tick skipping" behaviour (See patch
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"Further-improve-server-tick-loop"), making the above precautions
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completely unnecessary, which also rids paper of the previous described
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incompatibility with non-ticking chunks.
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diff --git a/src/main/java/net/minecraft/world/entity/item/ItemEntity.java b/src/main/java/net/minecraft/world/entity/item/ItemEntity.java
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index 4ce041726661dbbd19f36a516f2fd7f5e3307ef0..0f086af57a5ff08c264dcbf89a8c3931ec73a609 100644
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--- a/src/main/java/net/minecraft/world/entity/item/ItemEntity.java
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+++ b/src/main/java/net/minecraft/world/entity/item/ItemEntity.java
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@@ -60,7 +60,7 @@ public class ItemEntity extends Entity implements TraceableEntity {
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@Nullable
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public UUID target;
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public final float bobOffs;
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- private int lastTick = MinecraftServer.currentTick - 1; // CraftBukkit
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+ // private int lastTick = MinecraftServer.currentTick - 1; // CraftBukkit // Paper - remove anti tick skipping measures / wall time
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public boolean canMobPickup = true; // Paper - Item#canEntityPickup
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private int despawnRate = -1; // Paper - Alternative item-despawn-rate
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public net.kyori.adventure.util.TriState frictionState = net.kyori.adventure.util.TriState.NOT_SET; // Paper - Friction API
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@@ -153,12 +153,11 @@ public class ItemEntity extends Entity implements TraceableEntity {
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this.discard(EntityRemoveEvent.Cause.DESPAWN); // CraftBukkit - add Bukkit remove cause
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} else {
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super.tick();
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- // CraftBukkit start - Use wall time for pickup and despawn timers
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- int elapsedTicks = MinecraftServer.currentTick - this.lastTick;
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- if (this.pickupDelay != 32767) this.pickupDelay -= elapsedTicks;
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- if (this.age != -32768) this.age += elapsedTicks;
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- this.lastTick = MinecraftServer.currentTick;
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- // CraftBukkit end
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+ // Paper start - remove anti tick skipping measures / wall time - revert to vanilla
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+ if (this.pickupDelay > 0 && this.pickupDelay != 32767) {
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+ --this.pickupDelay;
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+ }
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+ // Paper end - remove anti tick skipping measures / wall time - revert to vanilla
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this.xo = this.getX();
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this.yo = this.getY();
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@@ -212,7 +211,7 @@ public class ItemEntity extends Entity implements TraceableEntity {
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this.mergeWithNeighbours();
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}
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- /* CraftBukkit start - moved up
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+ // Paper - remove anti tick skipping measures / wall time - revert to vanilla /* CraftBukkit start - moved up
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if (this.age != -32768) {
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++this.age;
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}
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@@ -243,12 +242,14 @@ public class ItemEntity extends Entity implements TraceableEntity {
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// Spigot start - copied from above
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@Override
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public void inactiveTick() {
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- // CraftBukkit start - Use wall time for pickup and despawn timers
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- int elapsedTicks = MinecraftServer.currentTick - this.lastTick;
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- if (this.pickupDelay != 32767) this.pickupDelay -= elapsedTicks;
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- if (this.age != -32768) this.age += elapsedTicks;
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- this.lastTick = MinecraftServer.currentTick;
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- // CraftBukkit end
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+ // Paper start - remove anti tick skipping measures / wall time - copied from above
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+ if (this.pickupDelay > 0 && this.pickupDelay != 32767) {
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+ --this.pickupDelay;
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+ }
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+ if (this.age != -32768) {
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+ ++this.age;
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+ }
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+ // Paper end - remove anti tick skipping measures / wall time - copied from above
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if (!this.level().isClientSide && this.age >= this.despawnRate) { // Spigot // Paper - Alternative item-despawn-rate
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// CraftBukkit start - fire ItemDespawnEvent
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diff --git a/src/main/java/net/minecraft/world/entity/monster/Zombie.java b/src/main/java/net/minecraft/world/entity/monster/Zombie.java
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index 94b3ba2688676e92d9d093b63d92cab39d5d2f02..a12461907278cfbfa3b1c0aa74b9f07a31768b8a 100644
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--- a/src/main/java/net/minecraft/world/entity/monster/Zombie.java
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+++ b/src/main/java/net/minecraft/world/entity/monster/Zombie.java
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@@ -98,7 +98,7 @@ public class Zombie extends Monster {
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private boolean canBreakDoors;
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private int inWaterTime;
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public int conversionTime;
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- private int lastTick = MinecraftServer.currentTick; // CraftBukkit - add field
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+ // private int lastTick = MinecraftServer.currentTick; // CraftBukkit - add field // Paper - remove anti tick skipping measures / wall time
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private boolean shouldBurnInDay = true; // Paper - Add more Zombie API
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public Zombie(EntityType<? extends Zombie> type, Level world) {
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@@ -217,10 +217,7 @@ public class Zombie extends Monster {
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public void tick() {
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if (!this.level().isClientSide && this.isAlive() && !this.isNoAi()) {
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if (this.isUnderWaterConverting()) {
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- // CraftBukkit start - Use wall time instead of ticks for conversion
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- int elapsedTicks = MinecraftServer.currentTick - this.lastTick;
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- this.conversionTime -= elapsedTicks;
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- // CraftBukkit end
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+ --this.conversionTime; // Paper - remove anti tick skipping measures / wall time
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if (this.conversionTime < 0) {
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this.doUnderWaterConversion();
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}
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@@ -237,7 +234,7 @@ public class Zombie extends Monster {
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}
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super.tick();
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- this.lastTick = MinecraftServer.currentTick; // CraftBukkit
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+ // this.lastTick = MinecraftServer.currentTick; // CraftBukkit // Paper - remove anti tick skipping measures / wall time
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}
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@Override
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@@ -278,7 +275,7 @@ public class Zombie extends Monster {
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}
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// Paper end - Add more Zombie API
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public void startUnderWaterConversion(int ticksUntilWaterConversion) {
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- this.lastTick = MinecraftServer.currentTick; // CraftBukkit
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+ // this.lastTick = MinecraftServer.currentTick; // CraftBukkit // Paper - remove anti tick skipping measures / wall time
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this.conversionTime = ticksUntilWaterConversion;
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this.getEntityData().set(Zombie.DATA_DROWNED_CONVERSION_ID, true);
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}
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diff --git a/src/main/java/net/minecraft/world/level/block/entity/BrewingStandBlockEntity.java b/src/main/java/net/minecraft/world/level/block/entity/BrewingStandBlockEntity.java
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index 2bafacd7bc56186d9105d2031180f8c4a6940018..4ea29e8f2b39d7b44e0461d6a2cdd3fc257abd44 100644
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--- a/src/main/java/net/minecraft/world/level/block/entity/BrewingStandBlockEntity.java
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+++ b/src/main/java/net/minecraft/world/level/block/entity/BrewingStandBlockEntity.java
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@@ -55,7 +55,7 @@ public class BrewingStandBlockEntity extends BaseContainerBlockEntity implements
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public int fuel;
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protected final ContainerData dataAccess;
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// CraftBukkit start - add fields and methods
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- private int lastTick = MinecraftServer.currentTick;
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+ // private int lastTick = MinecraftServer.currentTick; // Paper - remove anti tick skipping measures / wall time
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public List<HumanEntity> transaction = new java.util.ArrayList<HumanEntity>();
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private int maxStack = MAX_STACK;
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@@ -170,12 +170,10 @@ public class BrewingStandBlockEntity extends BaseContainerBlockEntity implements
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boolean flag1 = blockEntity.brewTime > 0;
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ItemStack itemstack1 = (ItemStack) blockEntity.items.get(3);
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- // CraftBukkit start - Use wall time instead of ticks for brewing
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- int elapsedTicks = MinecraftServer.currentTick - blockEntity.lastTick;
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- blockEntity.lastTick = MinecraftServer.currentTick;
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+ // Paper - remove anti tick skipping measures / wall time
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if (flag1) {
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- blockEntity.brewTime -= elapsedTicks;
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+ --blockEntity.brewTime; // Paper - remove anti tick skipping measures / wall time - revert to vanilla
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boolean flag2 = blockEntity.brewTime <= 0; // == -> <=
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// CraftBukkit end
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