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01c4820450
Paper/patches/server/0286-Mob-Spawner-API-Enhancements.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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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: William Blake Galbreath <blake.galbreath@gmail.com>
Date: Fri, 19 Apr 2019 12:41:13 -0500
Subject: [PATCH] Mob Spawner API Enhancements
== AT ==
public net.minecraft.world.level.BaseSpawner isNearPlayer(Lnet/minecraft/world/level/Level;Lnet/minecraft/core/BlockPos;)Z
public net.minecraft.world.level.BaseSpawner delay(Lnet/minecraft/world/level/Level;Lnet/minecraft/core/BlockPos;)V
public net.minecraft.world.level.BaseSpawner setNextSpawnData(Lnet/minecraft/world/level/Level;Lnet/minecraft/core/BlockPos;Lnet/minecraft/world/level/SpawnData;)V
diff --git a/src/main/java/net/minecraft/world/level/BaseSpawner.java b/src/main/java/net/minecraft/world/level/BaseSpawner.java
index 1d0964a7f544735a0213d5c7832c71f53db139a9..b90127f9f805fdb5bb43a4b8ad2b10499b0b6b78 100644
--- a/src/main/java/net/minecraft/world/level/BaseSpawner.java
+++ b/src/main/java/net/minecraft/world/level/BaseSpawner.java
@@ -237,7 +237,13 @@ public abstract class BaseSpawner {
}
public void load(@Nullable Level world, BlockPos pos, CompoundTag nbt) {
+ // Paper start - use larger int if set
+ if (nbt.contains("Paper.Delay")) {
+ this.spawnDelay = nbt.getInt("Paper.Delay");
+ } else {
this.spawnDelay = nbt.getShort("Delay");
+ }
+ // Paper end
boolean flag = nbt.contains("SpawnData", 10);
if (flag) {
@@ -260,9 +266,15 @@ public abstract class BaseSpawner {
this.spawnPotentials = SimpleWeightedRandomList.single(this.nextSpawnData != null ? this.nextSpawnData : new SpawnData());
}
+ // Paper start - use ints if set
+ if (nbt.contains("Paper.MinSpawnDelay", net.minecraft.nbt.Tag.TAG_ANY_NUMERIC)) {
+ this.minSpawnDelay = nbt.getInt("Paper.MinSpawnDelay");
+ this.maxSpawnDelay = nbt.getInt("Paper.MaxSpawnDelay");
+ this.spawnCount = nbt.getShort("SpawnCount");
+ } else // Paper end
if (nbt.contains("MinSpawnDelay", 99)) {
- this.minSpawnDelay = nbt.getShort("MinSpawnDelay");
- this.maxSpawnDelay = nbt.getShort("MaxSpawnDelay");
+ this.minSpawnDelay = nbt.getInt("MinSpawnDelay"); // Paper - short -> int
+ this.maxSpawnDelay = nbt.getInt("MaxSpawnDelay"); // Paper - short -> int
this.spawnCount = nbt.getShort("SpawnCount");
}
@@ -279,9 +291,20 @@ public abstract class BaseSpawner {
}
public CompoundTag save(CompoundTag nbt) {
- nbt.putShort("Delay", (short) this.spawnDelay);
- nbt.putShort("MinSpawnDelay", (short) this.minSpawnDelay);
- nbt.putShort("MaxSpawnDelay", (short) this.maxSpawnDelay);
+ // Paper start
+ if (spawnDelay > Short.MAX_VALUE) {
+ nbt.putInt("Paper.Delay", this.spawnDelay);
+ }
+ nbt.putShort("Delay", (short) Math.min(Short.MAX_VALUE, this.spawnDelay));
+
+ if (minSpawnDelay > Short.MAX_VALUE || maxSpawnDelay > Short.MAX_VALUE) {
+ nbt.putInt("Paper.MinSpawnDelay", this.minSpawnDelay);
+ nbt.putInt("Paper.MaxSpawnDelay", this.maxSpawnDelay);
+ }
+
+ nbt.putShort("MinSpawnDelay", (short) Math.min(Short.MAX_VALUE, this.minSpawnDelay));
+ nbt.putShort("MaxSpawnDelay", (short) Math.min(Short.MAX_VALUE, this.maxSpawnDelay));
+ // Paper end
nbt.putShort("SpawnCount", (short) this.spawnCount);
nbt.putShort("MaxNearbyEntities", (short) this.maxNearbyEntities);
nbt.putShort("RequiredPlayerRange", (short) this.requiredPlayerRange);
diff --git a/src/main/java/org/bukkit/craftbukkit/block/CraftCreatureSpawner.java b/src/main/java/org/bukkit/craftbukkit/block/CraftCreatureSpawner.java
index 9b2b6697d0b64da2bc99dc646f552c2689d5a1fc..146dde200845abcbe11015dda2c826a1aa711e42 100644
--- a/src/main/java/org/bukkit/craftbukkit/block/CraftCreatureSpawner.java
+++ b/src/main/java/org/bukkit/craftbukkit/block/CraftCreatureSpawner.java
@@ -29,7 +29,7 @@ import org.bukkit.craftbukkit.entity.CraftEntityType;
import org.bukkit.entity.EntitySnapshot;
import org.bukkit.entity.EntityType;
-public class CraftCreatureSpawner extends CraftBlockEntityState<SpawnerBlockEntity> implements CreatureSpawner {
+public class CraftCreatureSpawner extends CraftBlockEntityState<SpawnerBlockEntity> implements CreatureSpawner, org.bukkit.craftbukkit.spawner.PaperSharedSpawnerLogic { // Paper - more spawner API
public CraftCreatureSpawner(World world, SpawnerBlockEntity tileEntity) {
super(world, tileEntity);
@@ -291,4 +291,38 @@ public class CraftCreatureSpawner extends CraftBlockEntityState<SpawnerBlockEnti
new HashMap<>(nms.slotDropChances().entrySet().stream().collect(Collectors.toMap((entry) -> CraftEquipmentSlot.getSlot(entry.getKey()), Map.Entry::getValue)))
)).orElse(null);
}
+
+ // Paper start - more spawner API
+ @Override
+ public boolean isActivated() {
+ requirePlaced();
+ return org.bukkit.craftbukkit.spawner.PaperSharedSpawnerLogic.super.isActivated();
+ }
+
+ @Override
+ public void resetTimer() {
+ requirePlaced();
+ org.bukkit.craftbukkit.spawner.PaperSharedSpawnerLogic.super.resetTimer();
+ }
+
+ @Override
+ public void setNextSpawnData(final SpawnData spawnData) {
+ this.getSpawner().setNextSpawnData(this.isPlaced() ? this.getInternalWorld() : null, this.getInternalPosition(), spawnData);
+ }
+
+ @Override
+ public BaseSpawner getSpawner() {
+ return this.getSnapshot().getSpawner();
+ }
+
+ @Override
+ public net.minecraft.core.BlockPos getInternalPosition() {
+ return this.getPosition();
+ }
+
+ @Override
+ public net.minecraft.world.level.Level getInternalWorld() {
+ return this.world.getHandle();
+ }
+ // Paper end - more spawner API
}
diff --git a/src/main/java/org/bukkit/craftbukkit/entity/CraftMinecartMobSpawner.java b/src/main/java/org/bukkit/craftbukkit/entity/CraftMinecartMobSpawner.java
index 72e34dbfadcebb26a0707ce095b0d270f4d1d97c..e8ece01669373ecf6552d33b2ed72668524e2650 100644
--- a/src/main/java/org/bukkit/craftbukkit/entity/CraftMinecartMobSpawner.java
+++ b/src/main/java/org/bukkit/craftbukkit/entity/CraftMinecartMobSpawner.java
@@ -16,7 +16,7 @@ import org.bukkit.entity.EntitySnapshot;
import org.bukkit.entity.EntityType;
import org.bukkit.entity.minecart.SpawnerMinecart;
-final class CraftMinecartMobSpawner extends CraftMinecart implements SpawnerMinecart {
+final class CraftMinecartMobSpawner extends CraftMinecart implements SpawnerMinecart, org.bukkit.craftbukkit.spawner.PaperSharedSpawnerLogic { // Paper - more spawner API
CraftMinecartMobSpawner(CraftServer server, MinecartSpawner entity) {
super(server, entity);
}
@@ -171,4 +171,21 @@ final class CraftMinecartMobSpawner extends CraftMinecart implements SpawnerMine
public String toString() {
return "CraftMinecartMobSpawner";
}
+
+ // Paper start - more spawner API
+ @Override
+ public net.minecraft.world.level.BaseSpawner getSpawner() {
+ return this.getHandle().getSpawner();
+ }
+
+ @Override
+ public net.minecraft.world.level.Level getInternalWorld() {
+ return this.getHandle().level();
+ }
+
+ @Override
+ public net.minecraft.core.BlockPos getInternalPosition() {
+ return this.getHandle().blockPosition();
+ }
+ // Paper end - more spawner API
}
diff --git a/src/main/java/org/bukkit/craftbukkit/spawner/PaperSharedSpawnerLogic.java b/src/main/java/org/bukkit/craftbukkit/spawner/PaperSharedSpawnerLogic.java
new file mode 100644
index 0000000000000000000000000000000000000000..b1d08dc4c4257a6f5cd70dfdddade58ff7eedb4b
--- /dev/null
+++ b/src/main/java/org/bukkit/craftbukkit/spawner/PaperSharedSpawnerLogic.java
@@ -0,0 +1,56 @@
+package org.bukkit.craftbukkit.spawner;
+
+import com.google.common.base.Preconditions;
+import java.util.Optional;
+import net.minecraft.core.BlockPos;
+import net.minecraft.core.registries.BuiltInRegistries;
+import net.minecraft.nbt.CompoundTag;
+import net.minecraft.world.entity.Entity;
+import net.minecraft.world.entity.EntityType;
+import net.minecraft.world.level.BaseSpawner;
+import net.minecraft.world.level.Level;
+import net.minecraft.world.level.SpawnData;
+import org.bukkit.craftbukkit.inventory.CraftItemStack;
+import org.bukkit.inventory.ItemStack;
+import org.bukkit.spawner.Spawner;
+
+/**
+ * A common parent interface for both the {@link org.bukkit.craftbukkit.block.CraftCreatureSpawner} and minecart mob spawner.
+ */
+public interface PaperSharedSpawnerLogic extends Spawner {
+
+ BaseSpawner getSpawner();
+
+ Level getInternalWorld();
+
+ BlockPos getInternalPosition();
+
+ default boolean isActivated() {
+ return this.getSpawner().isNearPlayer(this.getInternalWorld(), this.getInternalPosition());
+ }
+
+ default void resetTimer() {
+ this.getSpawner().delay(this.getInternalWorld(), this.getInternalPosition());
+ }
+
+ default void setNextSpawnData(SpawnData spawnData) {
+ this.getSpawner().setNextSpawnData(this.getInternalWorld(), this.getInternalPosition(), spawnData);
+ }
+
+ default void setSpawnedItem(final ItemStack itemStack) {
+ Preconditions.checkArgument(itemStack != null && !itemStack.getType().isAir(), "spawners cannot spawn air");
+
+ final net.minecraft.world.item.ItemStack item = CraftItemStack.asNMSCopy(itemStack);
+ final CompoundTag entity = new CompoundTag();
+ entity.putString(Entity.ID_TAG, BuiltInRegistries.ENTITY_TYPE.getKey(EntityType.ITEM).toString());
+ entity.put("Item", item.save(this.getInternalWorld().registryAccess()));
+
+ this.setNextSpawnData(
+ new net.minecraft.world.level.SpawnData(
+ entity,
+ java.util.Optional.empty(),
+ Optional.ofNullable(this.getSpawner().nextSpawnData).flatMap(SpawnData::equipment)
+ )
+ );
+ }
+}
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