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Paper/Spigot-Server-Patches/0502-Optimize-isOutsideRange-to-use-distance-maps.patch
Aikar f0409edcd7
Drop Close region files patch, doesn't add any value. 
Upon further knowledge of the system, it is known that region files
are closing properly, as well as this didn't help native memory use anyways.

This patch also caused issues compiling on a newer JDK being able to
release the jar to java 8 users.
2020-06-08 17:07:23 -04:00

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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Spottedleaf <Spottedleaf@users.noreply.github.com>
Date: Tue, 5 May 2020 20:40:53 -0700
Subject: [PATCH] Optimize isOutsideRange to use distance maps
Use a distance map to find the players in range quickly
diff --git a/src/main/java/net/minecraft/server/ChunkMapDistance.java b/src/main/java/net/minecraft/server/ChunkMapDistance.java
index 4e0ea454f00c69f03023f01c1d4bd2eda5553a02..353b186060b2c0417a49ab3865ea5972c859b016 100644
--- a/src/main/java/net/minecraft/server/ChunkMapDistance.java
+++ b/src/main/java/net/minecraft/server/ChunkMapDistance.java
@@ -31,7 +31,7 @@ public abstract class ChunkMapDistance {
private final Long2ObjectMap<ObjectSet<EntityPlayer>> c = new Long2ObjectOpenHashMap();
public final Long2ObjectOpenHashMap<ArraySetSorted<Ticket<?>>> tickets = new Long2ObjectOpenHashMap();
private final ChunkMapDistance.a e = new ChunkMapDistance.a();
- private final ChunkMapDistance.b f = new ChunkMapDistance.b(8);
+ public static final int MOB_SPAWN_RANGE = 8; //private final ChunkMapDistance.b f = new ChunkMapDistance.b(8); // Paper - no longer used
private final ChunkMapDistance.c g = new ChunkMapDistance.c(33);
// Paper start use a queue, but still keep unique requirement
public final java.util.Queue<PlayerChunk> pendingChunkUpdates = new java.util.ArrayDeque<PlayerChunk>() {
@@ -50,6 +50,8 @@ public abstract class ChunkMapDistance {
private final Executor m;
private long currentTick;
+ PlayerChunkMap chunkMap; // Paper
+
protected ChunkMapDistance(Executor executor, Executor executor1) {
executor1.getClass();
Mailbox<Runnable> mailbox = Mailbox.a("player ticket throttler", executor1::execute);
@@ -94,7 +96,7 @@ public abstract class ChunkMapDistance {
protected abstract PlayerChunk a(long i, int j, @Nullable PlayerChunk playerchunk, int k);
public boolean a(PlayerChunkMap playerchunkmap) {
- this.f.a();
+ //this.f.a(); // Paper - no longer used
this.g.a();
int i = Integer.MAX_VALUE - this.e.a(Integer.MAX_VALUE);
boolean flag = i != 0;
@@ -230,7 +232,7 @@ public abstract class ChunkMapDistance {
((ObjectSet) this.c.computeIfAbsent(i, (j) -> {
return new ObjectOpenHashSet();
})).add(entityplayer);
- this.f.b(i, 0, true);
+ //this.f.b(i, 0, true); // Paper - no longer used
this.g.b(i, 0, true);
}
@@ -242,7 +244,7 @@ public abstract class ChunkMapDistance {
objectset.remove(entityplayer);
if (objectset.isEmpty()) {
this.c.remove(i);
- this.f.b(i, Integer.MAX_VALUE, false);
+ //this.f.b(i, Integer.MAX_VALUE, false); // Paper - no longer used
this.g.b(i, Integer.MAX_VALUE, false);
}
@@ -266,13 +268,17 @@ public abstract class ChunkMapDistance {
}
public int b() {
- this.f.a();
- return this.f.a.size();
+ // Paper start - use distance map to implement
+ // note: this is the spawn chunk count
+ return this.chunkMap.playerChunkTickRangeMap.size();
+ // Paper end - use distance map to implement
}
public boolean d(long i) {
- this.f.a();
- return this.f.a.containsKey(i);
+ // Paper start - use distance map to implement
+ // note: this is the is spawn chunk method
+ return this.chunkMap.playerChunkTickRangeMap.getObjectsInRange(i) != null;
+ // Paper end - use distance map to implement
}
public String c() {
diff --git a/src/main/java/net/minecraft/server/ChunkProviderServer.java b/src/main/java/net/minecraft/server/ChunkProviderServer.java
index ba99e9949c6fdfc4f49b6b6716100eb51697227d..7a275bf3260f9fbefc41883c5ebdc1eb2196daf0 100644
--- a/src/main/java/net/minecraft/server/ChunkProviderServer.java
+++ b/src/main/java/net/minecraft/server/ChunkProviderServer.java
@@ -725,6 +725,36 @@ public class ChunkProviderServer extends IChunkProvider {
boolean flag1 = this.world.getGameRules().getBoolean(GameRules.DO_MOB_SPAWNING) && !world.getPlayers().isEmpty(); // CraftBukkit
if (!flag) {
+ // Paper start - optimize isOutisdeRange
+ PlayerChunkMap playerChunkMap = this.playerChunkMap;
+ for (EntityPlayer player : this.world.players) {
+ if (!player.affectsSpawning || player.isSpectator()) {
+ playerChunkMap.playerMobSpawnMap.remove(player);
+ continue;
+ }
+
+ int viewDistance = this.playerChunkMap.getEffectiveViewDistance();
+
+ // copied and modified from isOutisdeRange
+ int chunkRange = world.spigotConfig.mobSpawnRange;
+ chunkRange = (chunkRange > viewDistance) ? (byte)viewDistance : chunkRange;
+ chunkRange = (chunkRange > ChunkMapDistance.MOB_SPAWN_RANGE) ? ChunkMapDistance.MOB_SPAWN_RANGE : chunkRange;
+
+ com.destroystokyo.paper.event.entity.PlayerNaturallySpawnCreaturesEvent event = new com.destroystokyo.paper.event.entity.PlayerNaturallySpawnCreaturesEvent(player.getBukkitEntity(), (byte)chunkRange);
+ event.callEvent();
+ if (event.isCancelled() || event.getSpawnRadius() < 0 || playerChunkMap.playerChunkTickRangeMap.getLastViewDistance(player) == -1) {
+ playerChunkMap.playerMobSpawnMap.remove(player);
+ continue;
+ }
+
+ int range = Math.min(event.getSpawnRadius(), 32); // limit to max view distance
+ int chunkX = net.minecraft.server.MCUtil.getChunkCoordinate(player.locX());
+ int chunkZ = net.minecraft.server.MCUtil.getChunkCoordinate(player.locZ());
+
+ playerChunkMap.playerMobSpawnMap.addOrUpdate(player, chunkX, chunkZ, range);
+ player.lastEntitySpawnRadiusSquared = (double)((range << 4) * (range << 4)); // used in isOutsideRange
+ }
+ // Paper end - optimize isOutisdeRange
this.world.getMethodProfiler().enter("pollingChunks");
int k = this.world.getGameRules().getInt(GameRules.RANDOM_TICK_SPEED);
BlockPosition blockposition = this.world.getSpawn();
@@ -759,15 +789,7 @@ public class ChunkProviderServer extends IChunkProvider {
this.world.timings.countNaturalMobs.stopTiming(); // Paper - timings
this.world.getMethodProfiler().exit();
- //Paper start - call player naturally spawn event
- int chunkRange = world.spigotConfig.mobSpawnRange;
- chunkRange = (chunkRange > world.spigotConfig.viewDistance) ? (byte) world.spigotConfig.viewDistance : chunkRange;
- chunkRange = Math.min(chunkRange, 8);
- for (EntityPlayer entityPlayer : this.world.players) {
- entityPlayer.playerNaturallySpawnedEvent = new com.destroystokyo.paper.event.entity.PlayerNaturallySpawnCreaturesEvent(entityPlayer.getBukkitEntity(), (byte) chunkRange);
- entityPlayer.playerNaturallySpawnedEvent.callEvent();
- };
- // Paper end
+ // Paper - replaced by above
final int[] chunksTicked = {0}; this.playerChunkMap.forEachVisibleChunk((playerchunk) -> { // Paper - safe iterator incase chunk loads, also no wrapping
Optional<Chunk> optional = ((Either) playerchunk.b().getNow(PlayerChunk.UNLOADED_CHUNK)).left();
@@ -781,10 +803,10 @@ public class ChunkProviderServer extends IChunkProvider {
this.world.getMethodProfiler().exit();
ChunkCoordIntPair chunkcoordintpair = playerchunk.i();
- if (!this.playerChunkMap.isOutsideOfRange(chunkcoordintpair)) {
+ if (!this.playerChunkMap.isOutsideOfRange(playerchunk, chunkcoordintpair, false)) { // Paper - optimise isOutsideOfRange
// Paper end
chunk.setInhabitedTime(chunk.getInhabitedTime() + j);
- if (flag1 && (this.allowMonsters || this.allowAnimals) && this.world.getWorldBorder().isInBounds(chunk.getPos()) && !this.playerChunkMap.isOutsideOfRange(chunkcoordintpair, true)) { // Spigot
+ if (flag1 && (this.allowMonsters || this.allowAnimals) && this.world.getWorldBorder().isInBounds(chunk.getPos()) && !this.playerChunkMap.isOutsideOfRange(playerchunk, chunkcoordintpair, true)) { // Spigot // Paper - optimise isOutsideOfRange
this.world.getMethodProfiler().enter("spawner");
this.world.timings.mobSpawn.startTiming(); // Spigot
EnumCreatureType[] aenumcreaturetype1 = aenumcreaturetype;
diff --git a/src/main/java/net/minecraft/server/EntityPlayer.java b/src/main/java/net/minecraft/server/EntityPlayer.java
index 79c2187b7383336e7574709e6d4ad805e557976f..0560eca744cb2032bb6a3faf5aeafa95a7a6815e 100644
--- a/src/main/java/net/minecraft/server/EntityPlayer.java
+++ b/src/main/java/net/minecraft/server/EntityPlayer.java
@@ -109,6 +109,8 @@ public class EntityPlayer extends EntityHuman implements ICrafting {
public final com.destroystokyo.paper.util.misc.PooledLinkedHashSets.PooledObjectLinkedOpenHashSet<EntityPlayer> cachedSingleHashSet; // Paper
+ double lastEntitySpawnRadiusSquared; // Paper - optimise isOutsideRange, this field is in blocks
+
public EntityPlayer(MinecraftServer minecraftserver, WorldServer worldserver, GameProfile gameprofile, PlayerInteractManager playerinteractmanager) {
super((World) worldserver, gameprofile);
playerinteractmanager.player = this;
diff --git a/src/main/java/net/minecraft/server/PlayerChunk.java b/src/main/java/net/minecraft/server/PlayerChunk.java
index afc92dd031cdaf725b85c0b301d5a5a21da54720..6980d19f36c18cdbed6679dbdf04afd694e078b6 100644
--- a/src/main/java/net/minecraft/server/PlayerChunk.java
+++ b/src/main/java/net/minecraft/server/PlayerChunk.java
@@ -44,6 +44,18 @@ public class PlayerChunk {
long lastAutoSaveTime; // Paper - incremental autosave
long inactiveTimeStart; // Paper - incremental autosave
+ // Paper start - optimise isOutsideOfRange
+ // cached here to avoid a map lookup
+ com.destroystokyo.paper.util.misc.PooledLinkedHashSets.PooledObjectLinkedOpenHashSet<EntityPlayer> playersInMobSpawnRange;
+ com.destroystokyo.paper.util.misc.PooledLinkedHashSets.PooledObjectLinkedOpenHashSet<EntityPlayer> playersInChunkTickRange;
+
+ void updateRanges() {
+ long key = net.minecraft.server.MCUtil.getCoordinateKey(this.location);
+ this.playersInMobSpawnRange = this.chunkMap.playerMobSpawnMap.getObjectsInRange(key);
+ this.playersInChunkTickRange = this.chunkMap.playerChunkTickRangeMap.getObjectsInRange(key);
+ }
+ // Paper end - optimise isOutsideOfRange
+
public PlayerChunk(ChunkCoordIntPair chunkcoordintpair, int i, LightEngine lightengine, PlayerChunk.c playerchunk_c, PlayerChunk.d playerchunk_d) {
this.statusFutures = new AtomicReferenceArray(PlayerChunk.CHUNK_STATUSES.size());
this.fullChunkFuture = PlayerChunk.UNLOADED_CHUNK_FUTURE;
@@ -60,6 +72,7 @@ public class PlayerChunk {
this.n = this.oldTicketLevel;
this.a(i);
this.chunkMap = (PlayerChunkMap)playerchunk_d; // Paper
+ this.updateRanges(); // Paper - optimise isOutsideOfRange
}
// Paper start
diff --git a/src/main/java/net/minecraft/server/PlayerChunkMap.java b/src/main/java/net/minecraft/server/PlayerChunkMap.java
index f09bb1329cf993034661fb8cfbf87571fe5f1ebe..74b868d7cec0260a10ca7718f48308f4ec54d56b 100644
--- a/src/main/java/net/minecraft/server/PlayerChunkMap.java
+++ b/src/main/java/net/minecraft/server/PlayerChunkMap.java
@@ -153,6 +153,17 @@ public class PlayerChunkMap extends IChunkLoader implements PlayerChunk.d {
final com.destroystokyo.paper.util.misc.PlayerAreaMap[] playerEntityTrackerTrackMaps;
final int[] entityTrackerTrackRanges;
// Paper end - use distance map to optimise tracker
+ // Paper start - optimise PlayerChunkMap#isOutsideRange
+ // A note about the naming used here:
+ // Previously, mojang used a "spawn range" of 8 for controlling both ticking and
+ // mob spawn range. However, spigot makes the spawn range configurable by
+ // checking if the chunk is in the tick range (8) and the spawn range
+ // obviously this means a spawn range > 8 cannot be implemented
+
+ // these maps are named after spigot's uses
+ public final com.destroystokyo.paper.util.misc.PlayerAreaMap playerMobSpawnMap; // this map is absent from updateMaps since it's controlled at the start of the chunkproviderserver tick
+ public final com.destroystokyo.paper.util.misc.PlayerAreaMap playerChunkTickRangeMap;
+ // Paper end - optimise PlayerChunkMap#isOutsideRange
void addPlayerToDistanceMaps(EntityPlayer player) {
int chunkX = MCUtil.getChunkCoordinate(player.locX());
@@ -166,6 +177,9 @@ public class PlayerChunkMap extends IChunkLoader implements PlayerChunk.d {
trackMap.add(player, chunkX, chunkZ, Math.min(trackRange, this.getEffectiveViewDistance()));
}
// Paper end - use distance map to optimise entity tracker
+ // Paper start - optimise PlayerChunkMap#isOutsideRange
+ this.playerChunkTickRangeMap.add(player, chunkX, chunkZ, ChunkMapDistance.MOB_SPAWN_RANGE);
+ // Paper end - optimise PlayerChunkMap#isOutsideRange
}
void removePlayerFromDistanceMaps(EntityPlayer player) {
@@ -174,6 +188,10 @@ public class PlayerChunkMap extends IChunkLoader implements PlayerChunk.d {
this.playerEntityTrackerTrackMaps[i].remove(player);
}
// Paper end - use distance map to optimise tracker
+ // Paper start - optimise PlayerChunkMap#isOutsideRange
+ this.playerMobSpawnMap.remove(player);
+ this.playerChunkTickRangeMap.remove(player);
+ // Paper end - optimise PlayerChunkMap#isOutsideRange
}
void updateMaps(EntityPlayer player) {
@@ -188,6 +206,9 @@ public class PlayerChunkMap extends IChunkLoader implements PlayerChunk.d {
trackMap.update(player, chunkX, chunkZ, Math.min(trackRange, this.getEffectiveViewDistance()));
}
// Paper end - use distance map to optimise entity tracker
+ // Paper start - optimise PlayerChunkMap#isOutsideRange
+ this.playerChunkTickRangeMap.update(player, chunkX, chunkZ, ChunkMapDistance.MOB_SPAWN_RANGE);
+ // Paper end - optimise PlayerChunkMap#isOutsideRange
}
@@ -220,7 +241,7 @@ public class PlayerChunkMap extends IChunkLoader implements PlayerChunk.d {
this.mailboxWorldGen = this.p.a(threadedmailbox, false);
this.mailboxMain = this.p.a(mailbox, false);
this.lightEngine = new LightEngineThreaded(ilightaccess, this, this.world.getWorldProvider().f(), threadedmailbox1, this.p.a(threadedmailbox1, false));
- this.chunkDistanceManager = new PlayerChunkMap.a(executor, iasynctaskhandler);
+ this.chunkDistanceManager = new PlayerChunkMap.a(executor, iasynctaskhandler); this.chunkDistanceManager.chunkMap = this; // Paper
this.l = supplier;
this.m = new VillagePlace(new File(this.w, "poi"), datafixer, this.world); // Paper
this.setViewDistance(i);
@@ -263,6 +284,38 @@ public class PlayerChunkMap extends IChunkLoader implements PlayerChunk.d {
this.playerEntityTrackerTrackMaps[ordinal] = new com.destroystokyo.paper.util.misc.PlayerAreaMap(this.pooledLinkedPlayerHashSets);
}
// Paper end - use distance map to optimise entity tracker
+ // Paper start - optimise PlayerChunkMap#isOutsideRange
+ this.playerChunkTickRangeMap = new com.destroystokyo.paper.util.misc.PlayerAreaMap(this.pooledLinkedPlayerHashSets,
+ (EntityPlayer player, int rangeX, int rangeZ, int currPosX, int currPosZ, int prevPosX, int prevPosZ,
+ com.destroystokyo.paper.util.misc.PooledLinkedHashSets.PooledObjectLinkedOpenHashSet<EntityPlayer> newState) -> {
+ PlayerChunk playerChunk = PlayerChunkMap.this.getUpdatingChunk(MCUtil.getCoordinateKey(rangeX, rangeZ));
+ if (playerChunk != null) {
+ playerChunk.playersInChunkTickRange = newState;
+ }
+ },
+ (EntityPlayer player, int rangeX, int rangeZ, int currPosX, int currPosZ, int prevPosX, int prevPosZ,
+ com.destroystokyo.paper.util.misc.PooledLinkedHashSets.PooledObjectLinkedOpenHashSet<EntityPlayer> newState) -> {
+ PlayerChunk playerChunk = PlayerChunkMap.this.getUpdatingChunk(MCUtil.getCoordinateKey(rangeX, rangeZ));
+ if (playerChunk != null) {
+ playerChunk.playersInChunkTickRange = newState;
+ }
+ });
+ this.playerMobSpawnMap = new com.destroystokyo.paper.util.misc.PlayerAreaMap(this.pooledLinkedPlayerHashSets,
+ (EntityPlayer player, int rangeX, int rangeZ, int currPosX, int currPosZ, int prevPosX, int prevPosZ,
+ com.destroystokyo.paper.util.misc.PooledLinkedHashSets.PooledObjectLinkedOpenHashSet<EntityPlayer> newState) -> {
+ PlayerChunk playerChunk = PlayerChunkMap.this.getUpdatingChunk(MCUtil.getCoordinateKey(rangeX, rangeZ));
+ if (playerChunk != null) {
+ playerChunk.playersInMobSpawnRange = newState;
+ }
+ },
+ (EntityPlayer player, int rangeX, int rangeZ, int currPosX, int currPosZ, int prevPosX, int prevPosZ,
+ com.destroystokyo.paper.util.misc.PooledLinkedHashSets.PooledObjectLinkedOpenHashSet<EntityPlayer> newState) -> {
+ PlayerChunk playerChunk = PlayerChunkMap.this.getUpdatingChunk(MCUtil.getCoordinateKey(rangeX, rangeZ));
+ if (playerChunk != null) {
+ playerChunk.playersInMobSpawnRange = newState;
+ }
+ });
+ // Paper end - optimise PlayerChunkMap#isOutsideRange
}
public void updatePlayerMobTypeMap(Entity entity) {
@@ -282,6 +335,7 @@ public class PlayerChunkMap extends IChunkLoader implements PlayerChunk.d {
return entityPlayer.mobCounts[enumCreatureType.ordinal()];
}
+ private static double getDistanceSquaredFromChunk(ChunkCoordIntPair chunkPos, Entity entity) { return a(chunkPos, entity); } // Paper - OBFHELPER
private static double a(ChunkCoordIntPair chunkcoordintpair, Entity entity) {
double d0 = (double) (chunkcoordintpair.x * 16 + 8);
double d1 = (double) (chunkcoordintpair.z * 16 + 8);
@@ -460,6 +514,7 @@ public class PlayerChunkMap extends IChunkLoader implements PlayerChunk.d {
} else {
if (playerchunk != null) {
playerchunk.a(j);
+ playerchunk.updateRanges(); // Paper - optimise isOutsideOfRange
}
if (playerchunk != null) {
@@ -1397,30 +1452,53 @@ public class PlayerChunkMap extends IChunkLoader implements PlayerChunk.d {
return isOutsideOfRange(chunkcoordintpair, false);
}
- boolean isOutsideOfRange(ChunkCoordIntPair chunkcoordintpair, boolean reducedRange) {
- int chunkRange = world.spigotConfig.mobSpawnRange;
- chunkRange = (chunkRange > world.spigotConfig.viewDistance) ? (byte) world.spigotConfig.viewDistance : chunkRange;
- chunkRange = (chunkRange > 8) ? 8 : chunkRange;
+ // Paper start - optimise isOutsideOfRange
+ final boolean isOutsideOfRange(ChunkCoordIntPair chunkcoordintpair, boolean reducedRange) {
+ return this.isOutsideOfRange(this.getUpdatingChunk(chunkcoordintpair.pair()), chunkcoordintpair, reducedRange);
+ }
- final int finalChunkRange = chunkRange; // Paper for lambda below
- //double blockRange = (reducedRange) ? Math.pow(chunkRange << 4, 2) : 16384.0D; // Paper - use from event
- // Spigot end
- long i = chunkcoordintpair.pair();
+ final boolean isOutsideOfRange(PlayerChunk playerchunk, ChunkCoordIntPair chunkcoordintpair, boolean reducedRange) {
+ // this function is so hot that removing the map lookup call can have an order of magnitude impact on its performance
+ // tested and confirmed via System.nanoTime()
+ com.destroystokyo.paper.util.misc.PooledLinkedHashSets.PooledObjectLinkedOpenHashSet<EntityPlayer> playersInRange = reducedRange ? playerchunk.playersInMobSpawnRange : playerchunk.playersInChunkTickRange;
- return !this.chunkDistanceManager.d(i) ? true : this.playerMap.a(i).noneMatch((entityplayer) -> {
- // Paper start -
- com.destroystokyo.paper.event.entity.PlayerNaturallySpawnCreaturesEvent event;
- double blockRange = 16384.0D;
- if (reducedRange) {
- event = entityplayer.playerNaturallySpawnedEvent;
- if (event == null || event.isCancelled()) return false;
- blockRange = (double) ((event.getSpawnRadius() << 4) * (event.getSpawnRadius() << 4));
- }
+ if (playersInRange == null) {
+ return true;
+ }
- return (!entityplayer.isSpectator() && a(chunkcoordintpair, (Entity) entityplayer) < blockRange); // Spigot
- // Paper end
- });
+ Object[] backingSet = playersInRange.getBackingSet();
+
+ if (reducedRange) {
+ for (int i = 0, len = backingSet.length; i < len; ++i) {
+ Object raw = backingSet[i];
+ if (!(raw instanceof EntityPlayer)) {
+ continue;
+ }
+ EntityPlayer player = (EntityPlayer) raw;
+ // don't check spectator and whatnot, already handled by mob spawn map update
+ if (player.lastEntitySpawnRadiusSquared > getDistanceSquaredFromChunk(chunkcoordintpair, player)) {
+ return false; // in range
+ }
+ }
+ } else {
+ final double range = (ChunkMapDistance.MOB_SPAWN_RANGE * 16) * (ChunkMapDistance.MOB_SPAWN_RANGE * 16);
+ // before spigot, mob spawn range was actually mob spawn range + tick range, but it was split
+ for (int i = 0, len = backingSet.length; i < len; ++i) {
+ Object raw = backingSet[i];
+ if (!(raw instanceof EntityPlayer)) {
+ continue;
+ }
+ EntityPlayer player = (EntityPlayer) raw;
+ // don't check spectator and whatnot, already handled by mob spawn map update
+ if (range > getDistanceSquaredFromChunk(chunkcoordintpair, player)) {
+ return false; // in range
+ }
+ }
+ }
+ // no players in range
+ return true;
}
+ // Paper end - optimise isOutsideOfRange
private boolean b(EntityPlayer entityplayer) {
return entityplayer.isSpectator() && !this.world.getGameRules().getBoolean(GameRules.SPECTATORS_GENERATE_CHUNKS);
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