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Paper/Spigot-Server-Patches/0250-Add-some-Debug-to-Chunk-Entity-slices.patch

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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Aikar <aikar@aikar.co>
Date: Mon, 23 Jul 2018 22:44:23 -0400
Subject: [PATCH] Add some Debug to Chunk Entity slices
If we detect unexpected state, log and try to recover
This should hopefully avoid duplicate entities ever being created
if the entity was to end up in 2 different chunk slices
diff --git a/src/main/java/net/minecraft/world/entity/Entity.java b/src/main/java/net/minecraft/world/entity/Entity.java
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index 3a46a5001cda7402a97ac8552650cf64e7881fad..102c2bb98a99cdbfcdf1297341dbba91434ee0e3 100644
--- a/src/main/java/net/minecraft/world/entity/Entity.java
+++ b/src/main/java/net/minecraft/world/entity/Entity.java
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@@ -157,6 +157,7 @@ public abstract class Entity implements INamableTileEntity, ICommandListener, ne
}
}
};
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+ public List<Entity> entitySlice = null;
// Paper end
public com.destroystokyo.paper.loottable.PaperLootableInventoryData lootableData; // Paper
diff --git a/src/main/java/net/minecraft/world/level/chunk/Chunk.java b/src/main/java/net/minecraft/world/level/chunk/Chunk.java
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index f56ff8e727c74870229d4d146b13534863f620d6..e4accac8f2e8daa58f9b0c279ffcad9347448bb0 100644
--- a/src/main/java/net/minecraft/world/level/chunk/Chunk.java
+++ b/src/main/java/net/minecraft/world/level/chunk/Chunk.java
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@@ -26,6 +26,8 @@ import net.minecraft.ReportedException;
import net.minecraft.core.BlockPosition;
import net.minecraft.core.IRegistry;
import net.minecraft.nbt.NBTTagCompound;
+import net.minecraft.server.MinecraftServer;
+import net.minecraft.server.level.ChunkProviderServer;
import net.minecraft.server.level.PlayerChunk;
import net.minecraft.server.level.WorldServer;
import net.minecraft.util.EntitySlice;
@@ -551,6 +553,25 @@ public class Chunk implements IChunkAccess {
if (k >= this.entitySlices.length) {
k = this.entitySlices.length - 1;
}
+ // Paper - remove from any old list if its in one
+ List<Entity> nextSlice = this.entitySlices[k]; // the next list to be added to
+ List<Entity> currentSlice = entity.entitySlice;
+ if (nextSlice == currentSlice) {
+ if (World.DEBUG_ENTITIES) MinecraftServer.LOGGER.warn("Entity was already in this chunk!" + entity, new Throwable());
+ return; // ??? silly plugins
+ }
+ if (currentSlice != null && currentSlice.contains(entity)) {
+ // Still in an old chunk...
+ if (World.DEBUG_ENTITIES) MinecraftServer.LOGGER.warn("Entity is still in another chunk!" + entity, new Throwable());
+ Chunk chunk = entity.getCurrentChunk();
+ if (chunk != null) {
+ chunk.removeEntity(entity);
+ } else {
+ removeEntity(entity);
+ }
+ currentSlice.remove(entity); // Just incase the above did not remove from the previous slice
+ }
+ // Paper end
if (!entity.inChunk || entity.getCurrentChunk() != this) entityCounts.increment(entity.getMinecraftKeyString()); // Paper
entity.inChunk = true;
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@@ -560,6 +581,7 @@ public class Chunk implements IChunkAccess {
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entity.chunkZ = this.loc.z;
this.entities.add(entity); // Paper - per chunk entity list
this.entitySlices[k].add(entity);
+ entity.entitySlice = this.entitySlices[k]; // Paper
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this.markDirty(); // Paper
}
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@@ -585,6 +607,10 @@ public class Chunk implements IChunkAccess {
// Paper start
if (entity.currentChunk != null && entity.currentChunk.get() == this) entity.setCurrentChunk(null);
+ if (entitySlices[i] == entity.entitySlice) {
+ entity.entitySlice = null;
+ entity.inChunk = false;
+ }
if (!this.entitySlices[i].remove(entity)) {
return;
}