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PaperMC/patches/server/0335-Optimize-Hoppers.patch
Spottedleaf 01a13871de
Rewrite chunk system (#8177) 
Patch documentation to come

Issues with the old system that are fixed now:
- World generation does not scale with cpu cores effectively.
- Relies on the main thread for scheduling and maintaining chunk state, dropping chunk load/generate rates at lower tps.
- Unreliable prioritisation of chunk gen/load calls that block the main thread.
- Shutdown logic is utterly unreliable, as it has to wait for all chunks to unload - is it guaranteed that the chunk system is in a state on shutdown that it can reliably do this? Watchdog shutdown also typically failed due to thread checks, which is now resolved.
- Saving of data is not unified (i.e can save chunk data without saving entity data, poses problems for desync if shutdown is really abnormal.
- Entities are not loaded with chunks. This caused quite a bit of headache for Chunk#getEntities API, but now the new chunk system loads entities with chunks so that they are ready whenever the chunk loads in. Effectively brings the behavior back to 1.16 era, but still storing entities in their own separate regionfiles.

The above list is not complete. The patch documentation will complete it.

New chunk system hard relies on starlight and dataconverter, and most importantly the new concurrent utilities in ConcurrentUtil.

Some of the old async chunk i/o interface (i.e the old file io thread reroutes _some_ calls to the new file io thread) is kept for plugin compat reasons. It will be removed in the next major version of minecraft.

The old legacy chunk system patches have been moved to the removed folder in case we need them again.
2022-09-26 01:02:51 -07:00

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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Aikar <aikar@aikar.co>
Date: Wed, 27 Apr 2016 22:09:52 -0400
Subject: [PATCH] Optimize Hoppers
* Removes unnecessary extra calls to .update() that are very expensive
* Lots of itemstack cloning removed. Only clone if the item is actually moved
* Return true when a plugin cancels inventory move item event instead of false, as false causes pulls to cycle through all items.
However, pushes do not exhibit the same behavior, so this is not something plugins could of been relying on.
* Add option (Default on) to cooldown hoppers when they fail to move an item due to full inventory
* Skip subsequent InventoryMoveItemEvents if a plugin does not use the item after first event fire for an iteration
* Don't check for Entities with Inventories if the block above us is also occluding (not just Inventoried)
* Remove Streams from Item Suck In and restore restore 1.12 AABB checks which is simpler and no voxel allocations (was doing TWO Item Suck ins)
diff --git a/src/main/java/net/minecraft/server/MinecraftServer.java b/src/main/java/net/minecraft/server/MinecraftServer.java
index d6ca6ef7262e25620aceda589d21363193c70310..aa52b644b7af9261fdec06b29b7daa7ad8f89b3a 100644
--- a/src/main/java/net/minecraft/server/MinecraftServer.java
+++ b/src/main/java/net/minecraft/server/MinecraftServer.java
@@ -1405,6 +1405,7 @@ public abstract class MinecraftServer extends ReentrantBlockableEventLoop<TickTa
while (iterator.hasNext()) {
ServerLevel worldserver = (ServerLevel) iterator.next();
worldserver.hasPhysicsEvent = org.bukkit.event.block.BlockPhysicsEvent.getHandlerList().getRegisteredListeners().length > 0; // Paper
+ net.minecraft.world.level.block.entity.HopperBlockEntity.skipHopperEvents = worldserver.paperConfig().hopper.disableMoveEvent || org.bukkit.event.inventory.InventoryMoveItemEvent.getHandlerList().getRegisteredListeners().length == 0; // Paper
this.profiler.push(() -> {
return worldserver + " " + worldserver.dimension().location();
diff --git a/src/main/java/net/minecraft/world/item/ItemStack.java b/src/main/java/net/minecraft/world/item/ItemStack.java
index 4b41d2dd00c1b206c1419ba767a3474947664e53..5e0852c4656813272a7ee6cb9c2331410c1b7739 100644
--- a/src/main/java/net/minecraft/world/item/ItemStack.java
+++ b/src/main/java/net/minecraft/world/item/ItemStack.java
@@ -625,11 +625,12 @@ public final class ItemStack {
return this.getItem().interactLivingEntity(this, user, entity, hand);
}
- public ItemStack copy() {
- if (this.isEmpty()) {
+ public ItemStack copy() { return cloneItemStack(false); } // Paper
+ public ItemStack cloneItemStack(boolean origItem) { // Paper
+ if (!origItem && this.isEmpty()) { // Paper
return ItemStack.EMPTY;
} else {
- ItemStack itemstack = new ItemStack(this.getItem(), this.count);
+ ItemStack itemstack = new ItemStack(origItem ? this.item : this.getItem(), this.count); // Paper
itemstack.setPopTime(this.getPopTime());
if (this.tag != null) {
diff --git a/src/main/java/net/minecraft/world/level/block/entity/BlockEntity.java b/src/main/java/net/minecraft/world/level/block/entity/BlockEntity.java
index 06beb18e5e1950aeb6cb427876fcc4c5ea95adb2..b0174aedb7358af1e80278e2f5f13e00c35ab3c6 100644
--- a/src/main/java/net/minecraft/world/level/block/entity/BlockEntity.java
+++ b/src/main/java/net/minecraft/world/level/block/entity/BlockEntity.java
@@ -26,6 +26,7 @@ import co.aikar.timings.MinecraftTimings; // Paper
import co.aikar.timings.Timing; // Paper
public abstract class BlockEntity {
+ static boolean IGNORE_TILE_UPDATES = false; // Paper
public Timing tickTimer = MinecraftTimings.getTileEntityTimings(this); // Paper
// CraftBukkit start - data containers
@@ -162,6 +163,7 @@ public abstract class BlockEntity {
public void setChanged() {
if (this.level != null) {
+ if (IGNORE_TILE_UPDATES) return; // Paper
BlockEntity.setChanged(this.level, this.worldPosition, this.blockState);
}
diff --git a/src/main/java/net/minecraft/world/level/block/entity/Hopper.java b/src/main/java/net/minecraft/world/level/block/entity/Hopper.java
index a05acf709735b40ca86f978508c63a86065fd405..6a1405a8630e90db3b5a3c9152259ba6f5f0c784 100644
--- a/src/main/java/net/minecraft/world/level/block/entity/Hopper.java
+++ b/src/main/java/net/minecraft/world/level/block/entity/Hopper.java
@@ -14,6 +14,8 @@ public interface Hopper extends Container {
return SUCK;
}
+ default net.minecraft.core.BlockPos getBlockPosition() { return new net.minecraft.core.BlockPos(getLevelX(), getLevelY(), getLevelZ()); } // Paper
+
double getLevelX();
double getLevelY();
diff --git a/src/main/java/net/minecraft/world/level/block/entity/HopperBlockEntity.java b/src/main/java/net/minecraft/world/level/block/entity/HopperBlockEntity.java
index a507d7f65a94e49ecd18cd18797b156474558390..a7ac6b528aecae528a17af157f8ec29371e4484c 100644
--- a/src/main/java/net/minecraft/world/level/block/entity/HopperBlockEntity.java
+++ b/src/main/java/net/minecraft/world/level/block/entity/HopperBlockEntity.java
@@ -3,7 +3,6 @@ package net.minecraft.world.level.block.entity;
import java.util.Iterator;
import java.util.List;
import java.util.function.BooleanSupplier;
-import java.util.stream.Collectors;
import java.util.stream.IntStream;
import javax.annotation.Nullable;
import net.minecraft.core.BlockPos;
@@ -32,7 +31,6 @@ import net.minecraft.world.level.block.state.BlockState;
import net.minecraft.world.phys.AABB;
import net.minecraft.world.phys.shapes.BooleanOp;
import net.minecraft.world.phys.shapes.Shapes;
-import org.bukkit.Bukkit;
import org.bukkit.craftbukkit.entity.CraftHumanEntity;
import org.bukkit.craftbukkit.inventory.CraftItemStack;
import org.bukkit.entity.HumanEntity;
@@ -190,6 +188,158 @@ public class HopperBlockEntity extends RandomizableContainerBlockEntity implemen
return false;
}
+ // Paper start - Optimize Hoppers
+ private static boolean skipPullModeEventFire = false;
+ private static boolean skipPushModeEventFire = false;
+ public static boolean skipHopperEvents = false;
+
+ private static boolean hopperPush(Level level, BlockPos pos, Container destination, Direction enumdirection, HopperBlockEntity hopper) {
+ skipPushModeEventFire = skipHopperEvents;
+ boolean foundItem = false;
+ for (int i = 0; i < hopper.getContainerSize(); ++i) {
+ ItemStack item = hopper.getItem(i);
+ if (!item.isEmpty()) {
+ foundItem = true;
+ ItemStack origItemStack = item;
+ ItemStack itemstack = origItemStack;
+
+ final int origCount = origItemStack.getCount();
+ final int moved = Math.min(level.spigotConfig.hopperAmount, origCount);
+ origItemStack.setCount(moved);
+
+ // We only need to fire the event once to give protection plugins a chance to cancel this event
+ // Because nothing uses getItem, every event call should end up the same result.
+ if (!skipPushModeEventFire) {
+ itemstack = callPushMoveEvent(destination, itemstack, hopper);
+ if (itemstack == null) { // cancelled
+ origItemStack.setCount(origCount);
+ return false;
+ }
+ }
+ final ItemStack itemstack2 = addItem(hopper, destination, itemstack, enumdirection);
+ final int remaining = itemstack2.getCount();
+ if (remaining != moved) {
+ origItemStack = origItemStack.cloneItemStack(true);
+ origItemStack.setCount(origCount);
+ if (!origItemStack.isEmpty()) {
+ origItemStack.setCount(origCount - moved + remaining);
+ }
+ hopper.setItem(i, origItemStack);
+ destination.setChanged();
+ return true;
+ }
+ origItemStack.setCount(origCount);
+ }
+ }
+ if (foundItem && level.paperConfig().hopper.cooldownWhenFull) { // Inventory was full - cooldown
+ hopper.setCooldown(level.spigotConfig.hopperTransfer);
+ }
+ return false;
+ }
+
+ private static boolean hopperPull(Level level, Hopper ihopper, Container iinventory, ItemStack origItemStack, int i) {
+ ItemStack itemstack = origItemStack;
+ final int origCount = origItemStack.getCount();
+ final int moved = Math.min(level.spigotConfig.hopperAmount, origCount);
+ itemstack.setCount(moved);
+
+ if (!skipPullModeEventFire) {
+ itemstack = callPullMoveEvent(ihopper, iinventory, itemstack);
+ if (itemstack == null) { // cancelled
+ origItemStack.setCount(origCount);
+ // Drastically improve performance by returning true.
+ // No plugin could of relied on the behavior of false as the other call
+ // site for IMIE did not exhibit the same behavior
+ return true;
+ }
+ }
+
+ final ItemStack itemstack2 = addItem(iinventory, ihopper, itemstack, null);
+ final int remaining = itemstack2.getCount();
+ if (remaining != moved) {
+ origItemStack = origItemStack.cloneItemStack(true);
+ origItemStack.setCount(origCount);
+ if (!origItemStack.isEmpty()) {
+ origItemStack.setCount(origCount - moved + remaining);
+ }
+ IGNORE_TILE_UPDATES = true;
+ iinventory.setItem(i, origItemStack);
+ IGNORE_TILE_UPDATES = false;
+ iinventory.setChanged();
+ return true;
+ }
+ origItemStack.setCount(origCount);
+
+ if (level.paperConfig().hopper.cooldownWhenFull) {
+ cooldownHopper(ihopper);
+ }
+
+ return false;
+ }
+
+ private static ItemStack callPushMoveEvent(Container iinventory, ItemStack itemstack, HopperBlockEntity hopper) {
+ Inventory destinationInventory = getInventory(iinventory);
+ InventoryMoveItemEvent event = new InventoryMoveItemEvent(hopper.getOwner(false).getInventory(),
+ CraftItemStack.asCraftMirror(itemstack), destinationInventory, true);
+ boolean result = event.callEvent();
+ if (!event.calledGetItem && !event.calledSetItem) {
+ skipPushModeEventFire = true;
+ }
+ if (!result) {
+ cooldownHopper(hopper);
+ return null;
+ }
+
+ if (event.calledSetItem) {
+ return CraftItemStack.asNMSCopy(event.getItem());
+ } else {
+ return itemstack;
+ }
+ }
+
+ private static ItemStack callPullMoveEvent(Hopper hopper, Container iinventory, ItemStack itemstack) {
+ Inventory sourceInventory = getInventory(iinventory);
+ Inventory destination = getInventory(hopper);
+
+ InventoryMoveItemEvent event = new InventoryMoveItemEvent(sourceInventory,
+ // Mirror is safe as we no plugins ever use this item
+ CraftItemStack.asCraftMirror(itemstack), destination, false);
+ boolean result = event.callEvent();
+ if (!event.calledGetItem && !event.calledSetItem) {
+ skipPullModeEventFire = true;
+ }
+ if (!result) {
+ cooldownHopper(hopper);
+ return null;
+ }
+
+ if (event.calledSetItem) {
+ return CraftItemStack.asNMSCopy(event.getItem());
+ } else {
+ return itemstack;
+ }
+ }
+
+ private static Inventory getInventory(Container iinventory) {
+ Inventory sourceInventory;// Have to special case large chests as they work oddly
+ if (iinventory instanceof CompoundContainer) {
+ sourceInventory = new org.bukkit.craftbukkit.inventory.CraftInventoryDoubleChest((CompoundContainer) iinventory);
+ } else if (iinventory instanceof BlockEntity) {
+ sourceInventory = ((BlockEntity) iinventory).getOwner(false).getInventory();
+ } else {
+ sourceInventory = iinventory.getOwner().getInventory();
+ }
+ return sourceInventory;
+ }
+
+ private static void cooldownHopper(Hopper hopper) {
+ if (hopper instanceof HopperBlockEntity blockEntity) {
+ blockEntity.setCooldown(blockEntity.getLevel().spigotConfig.hopperTransfer);
+ } else if (hopper instanceof MinecartHopper blockEntity) {
+ blockEntity.setCooldown(blockEntity.getLevel().spigotConfig.hopperTransfer / 2);
+ }
+ }
+ // Paper end
private static boolean ejectItems(Level world, BlockPos blockposition, BlockState iblockdata, Container iinventory, HopperBlockEntity hopper) { // CraftBukkit
Container iinventory1 = HopperBlockEntity.getAttachedContainer(world, blockposition, iblockdata);
@@ -202,6 +352,7 @@ public class HopperBlockEntity extends RandomizableContainerBlockEntity implemen
if (HopperBlockEntity.isFullContainer(iinventory1, enumdirection)) {
return false;
} else {
+ return hopperPush(world, blockposition, iinventory1, enumdirection, hopper); /* // Paper - disable rest
for (int i = 0; i < iinventory.getContainerSize(); ++i) {
if (!iinventory.getItem(i).isEmpty()) {
ItemStack itemstack = iinventory.getItem(i).copy();
@@ -239,7 +390,7 @@ public class HopperBlockEntity extends RandomizableContainerBlockEntity implemen
}
}
- return false;
+ return false;*/ // Paper - end commenting out replaced block for Hopper Optimizations
}
}
}
@@ -249,27 +400,68 @@ public class HopperBlockEntity extends RandomizableContainerBlockEntity implemen
}
private static boolean isFullContainer(Container inventory, Direction direction) {
- return HopperBlockEntity.getSlots(inventory, direction).allMatch((i) -> {
- ItemStack itemstack = inventory.getItem(i);
-
- return itemstack.getCount() >= itemstack.getMaxStackSize();
- });
+ return allMatch(inventory, direction, STACK_SIZE_TEST); // Paper - no streams
}
private static boolean isEmptyContainer(Container inv, Direction facing) {
- return HopperBlockEntity.getSlots(inv, facing).allMatch((i) -> {
- return inv.getItem(i).isEmpty();
- });
+ // Paper start
+ return allMatch(inv, facing, IS_EMPTY_TEST);
+ }
+ private static boolean allMatch(Container iinventory, Direction enumdirection, java.util.function.BiPredicate<ItemStack, Integer> test) {
+ if (iinventory instanceof WorldlyContainer) {
+ for (int i : ((WorldlyContainer) iinventory).getSlotsForFace(enumdirection)) {
+ if (!test.test(iinventory.getItem(i), i)) {
+ return false;
+ }
+ }
+ } else {
+ int size = iinventory.getContainerSize();
+ for (int i = 0; i < size; i++) {
+ if (!test.test(iinventory.getItem(i), i)) {
+ return false;
+ }
+ }
+ }
+ return true;
}
+ private static boolean anyMatch(Container iinventory, Direction enumdirection, java.util.function.BiPredicate<ItemStack, Integer> test) {
+ if (iinventory instanceof WorldlyContainer) {
+ for (int i : ((WorldlyContainer) iinventory).getSlotsForFace(enumdirection)) {
+ if (test.test(iinventory.getItem(i), i)) {
+ return true;
+ }
+ }
+ } else {
+ int size = iinventory.getContainerSize();
+ for (int i = 0; i < size; i++) {
+ if (test.test(iinventory.getItem(i), i)) {
+ return true;
+ }
+ }
+ }
+ return true;
+ }
+ private static final java.util.function.BiPredicate<ItemStack, Integer> STACK_SIZE_TEST = (itemstack, i) -> itemstack.getCount() >= itemstack.getMaxStackSize();
+ private static final java.util.function.BiPredicate<ItemStack, Integer> IS_EMPTY_TEST = (itemstack, i) -> itemstack.isEmpty();
+ // Paper end
+
public static boolean suckInItems(Level world, Hopper hopper) {
Container iinventory = HopperBlockEntity.getSourceContainer(world, hopper);
if (iinventory != null) {
Direction enumdirection = Direction.DOWN;
- return HopperBlockEntity.isEmptyContainer(iinventory, enumdirection) ? false : HopperBlockEntity.getSlots(iinventory, enumdirection).anyMatch((i) -> {
- return HopperBlockEntity.a(hopper, iinventory, i, enumdirection, world); // Spigot
+ // Paper start - optimize hoppers and remove streams
+ skipPullModeEventFire = skipHopperEvents;
+ return !HopperBlockEntity.isEmptyContainer(iinventory, enumdirection) && anyMatch(iinventory, enumdirection, (item, i) -> {
+ // Logic copied from below to avoid extra getItem calls
+ if (!item.isEmpty() && canTakeItemFromContainer(iinventory, item, i, enumdirection)) {
+ return hopperPull(world, hopper, iinventory, item, i);
+ } else {
+ return false;
+ }
+ // Paper end
});
} else {
Iterator iterator = HopperBlockEntity.getItemsAtAndAbove(world, hopper).iterator();
@@ -288,10 +480,12 @@ public class HopperBlockEntity extends RandomizableContainerBlockEntity implemen
}
}
+ // Paper - method unused as logic is inlined above
private static boolean a(Hopper ihopper, Container iinventory, int i, Direction enumdirection, Level world) { // Spigot
ItemStack itemstack = iinventory.getItem(i);
- if (!itemstack.isEmpty() && HopperBlockEntity.canTakeItemFromContainer(iinventory, itemstack, i, enumdirection)) {
+ if (!itemstack.isEmpty() && HopperBlockEntity.canTakeItemFromContainer(iinventory, itemstack, i, enumdirection)) { // If this logic changes, update above. this is left inused incase reflective plugins
+ return hopperPull(world, ihopper, iinventory, itemstack, i); /* // Paper - disable rest
ItemStack itemstack1 = itemstack.copy();
// ItemStack itemstack2 = addItem(iinventory, ihopper, iinventory.removeItem(i, 1), (EnumDirection) null);
// CraftBukkit start - Call event on collection of items from inventories into the hopper
@@ -328,7 +522,7 @@ public class HopperBlockEntity extends RandomizableContainerBlockEntity implemen
}
itemstack1.shrink(origCount - itemstack2.getCount()); // Spigot
- iinventory.setItem(i, itemstack1);
+ iinventory.setItem(i, itemstack1);*/ // Paper - end commenting out replaced block for Hopper Optimizations
}
return false;
@@ -337,7 +531,7 @@ public class HopperBlockEntity extends RandomizableContainerBlockEntity implemen
public static boolean addItem(Container inventory, ItemEntity itemEntity) {
boolean flag = false;
// CraftBukkit start
- InventoryPickupItemEvent event = new InventoryPickupItemEvent(inventory.getOwner().getInventory(), (org.bukkit.entity.Item) itemEntity.getBukkitEntity());
+ InventoryPickupItemEvent event = new InventoryPickupItemEvent(getInventory(inventory), (org.bukkit.entity.Item) itemEntity.getBukkitEntity()); // Paper - use getInventory() to avoid snapshot creation
itemEntity.level.getCraftServer().getPluginManager().callEvent(event);
if (event.isCancelled()) {
return false;
@@ -396,7 +590,9 @@ public class HopperBlockEntity extends RandomizableContainerBlockEntity implemen
stack = stack.split(to.getMaxStackSize());
}
// Spigot end
+ IGNORE_TILE_UPDATES = true; // Paper
to.setItem(slot, stack);
+ IGNORE_TILE_UPDATES = false; // Paper
stack = ItemStack.EMPTY;
flag = true;
} else if (HopperBlockEntity.canMergeItems(itemstack1, stack)) {
@@ -447,18 +643,23 @@ public class HopperBlockEntity extends RandomizableContainerBlockEntity implemen
}
public static List<ItemEntity> getItemsAtAndAbove(Level world, Hopper hopper) {
- return (List) hopper.getSuckShape().toAabbs().stream().flatMap((axisalignedbb) -> {
- return world.getEntitiesOfClass(ItemEntity.class, axisalignedbb.move(hopper.getLevelX() - 0.5D, hopper.getLevelY() - 0.5D, hopper.getLevelZ() - 0.5D), EntitySelector.ENTITY_STILL_ALIVE).stream();
- }).collect(Collectors.toList());
+ // Paper start - Optimize item suck in. remove streams, restore 1.12 checks. Seriously checking the bowl?!
+ double d0 = hopper.getLevelX();
+ double d1 = hopper.getLevelY();
+ double d2 = hopper.getLevelZ();
+ AABB bb = new AABB(d0 - 0.5D, d1, d2 - 0.5D, d0 + 0.5D, d1 + 1.5D, d2 + 0.5D);
+ return world.getEntitiesOfClass(ItemEntity.class, bb, Entity::isAlive);
+ // Paper end
}
@Nullable
public static Container getContainerAt(Level world, BlockPos pos) {
- return HopperBlockEntity.getContainerAt(world, (double) pos.getX() + 0.5D, (double) pos.getY() + 0.5D, (double) pos.getZ() + 0.5D);
+ return HopperBlockEntity.getContainerAt(world, (double) pos.getX() + 0.5D, (double) pos.getY() + 0.5D, (double) pos.getZ() + 0.5D, true); // Paper
}
+ public static Container getContainerAt(Level world, double x, double y, double z) { return getContainerAt(world, x, y, z, false); } // Paper - overload to default false
@Nullable
- private static Container getContainerAt(Level world, double x, double y, double z) {
+ private static Container getContainerAt(Level world, double x, double y, double z, boolean optimizeEntities) {
Object object = null;
BlockPos blockposition = new BlockPos(x, y, z);
if ( !world.spigotConfig.hopperCanLoadChunks && !world.hasChunkAt( blockposition ) ) return null; // Spigot
@@ -478,7 +679,7 @@ public class HopperBlockEntity extends RandomizableContainerBlockEntity implemen
}
}
- if (object == null) {
+ if (object == null && (!optimizeEntities || !world.paperConfig().hopper.ignoreOccludingBlocks || !org.bukkit.craftbukkit.util.CraftMagicNumbers.getMaterial(block).isOccluding())) { // Paper
List<Entity> list = world.getEntities((Entity) null, new AABB(x - 0.5D, y - 0.5D, z - 0.5D, x + 0.5D, y + 0.5D, z + 0.5D), EntitySelector.CONTAINER_ENTITY_SELECTOR);
if (!list.isEmpty()) {
diff --git a/src/main/java/net/minecraft/world/level/block/entity/RandomizableContainerBlockEntity.java b/src/main/java/net/minecraft/world/level/block/entity/RandomizableContainerBlockEntity.java
index e3bee2df77d87630e96621470e940d9d9e152e7f..d559f93a9a09bac414dd5d58afccad42c127f09b 100644
--- a/src/main/java/net/minecraft/world/level/block/entity/RandomizableContainerBlockEntity.java
+++ b/src/main/java/net/minecraft/world/level/block/entity/RandomizableContainerBlockEntity.java
@@ -95,12 +95,19 @@ public abstract class RandomizableContainerBlockEntity extends BaseContainerBloc
@Override
public boolean isEmpty() {
this.unpackLootTable((Player)null);
- return this.getItems().stream().allMatch(ItemStack::isEmpty);
+ // Paper start
+ for (ItemStack itemStack : this.getItems()) {
+ if (!itemStack.isEmpty()) {
+ return false;
+ }
+ }
+ // Paper end
+ return true;
}
@Override
public ItemStack getItem(int slot) {
- this.unpackLootTable((Player)null);
+ if (slot == 0) this.unpackLootTable((Player) null); // Paper
return this.getItems().get(slot);
}
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