From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Aikar <aikar@aikar.co>
Date: Sat, 7 Jan 2017 15:24:46 -0500
Subject: [PATCH] Provide E/TE/Chunk count stat methods

Provides counts without the ineffeciency of using .getEntities().size()
which creates copy of the collections.

diff --git a/src/main/java/net/minecraft/world/level/Level.java b/src/main/java/net/minecraft/world/level/Level.java
index 926e4f9760e07ab66405132de2e96306211e5b9c..7800276dea6176ed489809d589b850252fc9333b 100644
--- a/src/main/java/net/minecraft/world/level/Level.java
+++ b/src/main/java/net/minecraft/world/level/Level.java
@@ -114,7 +114,7 @@ public abstract class Level implements LevelAccessor, AutoCloseable {
     public static final int TICKS_PER_DAY = 24000;
     public static final int MAX_ENTITY_SPAWN_Y = 20000000;
     public static final int MIN_ENTITY_SPAWN_Y = -20000000;
-    protected final List<TickingBlockEntity> blockEntityTickers = Lists.newArrayList();
+    public final List<TickingBlockEntity> blockEntityTickers = Lists.newArrayList(); // Paper - public
     protected final NeighborUpdater neighborUpdater;
     private final List<TickingBlockEntity> pendingBlockEntityTickers = Lists.newArrayList();
     private boolean tickingBlockEntities;
diff --git a/src/main/java/org/bukkit/craftbukkit/CraftWorld.java b/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
index 95b3bcd4cfcedc358096831bc59a7effd186a063..aac9eee069b16ab70b7553c6c324149011c94f8e 100644
--- a/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
+++ b/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
@@ -164,6 +164,56 @@ public class CraftWorld extends CraftRegionAccessor implements World {
     private final CraftPersistentDataContainer persistentDataContainer = new CraftPersistentDataContainer(CraftWorld.DATA_TYPE_REGISTRY);
     private net.kyori.adventure.pointer.Pointers adventure$pointers; // Paper - implement pointers
 
+    // Paper start - Provide fast information methods
+    @Override
+    public int getEntityCount() {
+        int ret = 0;
+        for (net.minecraft.world.entity.Entity entity : world.getEntities().getAll()) {
+            if (entity.isChunkLoaded()) {
+                ++ret;
+            }
+        }
+        return ret;
+    }
+
+    @Override
+    public int getTileEntityCount() {
+        // We don't use the full world tile entity list, so we must iterate chunks
+        int size = 0;
+        for (ChunkHolder playerchunk : io.papermc.paper.chunk.system.ChunkSystem.getVisibleChunkHolders(this.world)) {
+            net.minecraft.world.level.chunk.LevelChunk chunk = playerchunk.getTickingChunk();
+            if (chunk == null) {
+                continue;
+            }
+            size += chunk.blockEntities.size();
+        }
+        return size;
+    }
+
+    @Override
+    public int getTickableTileEntityCount() {
+        return world.blockEntityTickers.size();
+    }
+
+    @Override
+    public int getChunkCount() {
+        int ret = 0;
+
+        for (ChunkHolder chunkHolder : io.papermc.paper.chunk.system.ChunkSystem.getVisibleChunkHolders(this.world)) {
+            if (chunkHolder.getTickingChunk() != null) {
+                ++ret;
+            }
+        }
+
+        return ret;
+    }
+
+    @Override
+    public int getPlayerCount() {
+        return world.players().size();
+    }
+    // Paper end
+
     private static final Random rand = new Random();
 
     public CraftWorld(ServerLevel world, ChunkGenerator gen, BiomeProvider biomeProvider, Environment env) {