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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/level/ChunkMapDistance.java b/src/main/java/net/minecraft/server/level/ChunkMapDistance.java
index 60fcea78bf617559114b1ca1c0bf2d4cd9075a8c..335666db1854e8aa4b2ba71d5bdc2658305cb70a 100644
--- a/src/main/java/net/minecraft/server/level/ChunkMapDistance.java
+++ b/src/main/java/net/minecraft/server/level/ChunkMapDistance.java
@@ -37,7 +37,7 @@ public abstract class ChunkMapDistance {
private final Long2ObjectMap<ObjectSet<EntityPlayer>> c = new Long2ObjectOpenHashMap();
public final Long2ObjectOpenHashMap<ArraySetSorted<Ticket<?>>> tickets = new Long2ObjectOpenHashMap();
private final ChunkMapDistance.a ticketLevelTracker = 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>() {
@@ -56,6 +56,8 @@ 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);
@@ -100,7 +102,7 @@ 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.ticketLevelTracker.a(Integer.MAX_VALUE);
boolean flag = i != 0;
@@ -236,7 +238,7 @@ public abstract class ChunkMapDistance {
((ObjectSet) this.c.computeIfAbsent(i, (j) -> {
return new ObjectOpenHashSet();
})).add(entityplayer);
- this.f.update(i, 0, true);
+ //this.f.update(i, 0, true); // Paper - no longer used
this.g.update(i, 0, true);
}
@@ -248,7 +250,7 @@ public abstract class ChunkMapDistance {
if (objectset != null) objectset.remove(entityplayer); // Paper - some state corruption happens here, don't crash, clean up gracefully.
if (objectset == null || objectset.isEmpty()) { // Paper
this.c.remove(i);
- this.f.update(i, Integer.MAX_VALUE, false);
+ //this.f.update(i, Integer.MAX_VALUE, false); // Paper - no longer used
this.g.update(i, Integer.MAX_VALUE, false);
}
@@ -272,13 +274,17 @@ 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/level/ChunkProviderServer.java b/src/main/java/net/minecraft/server/level/ChunkProviderServer.java
index fc7140e0eb11e4bec99e453647fce200bca0ed7f..46a2e89df71654024102427859c385fc2e09cae7 100644
--- a/src/main/java/net/minecraft/server/level/ChunkProviderServer.java
+++ b/src/main/java/net/minecraft/server/level/ChunkProviderServer.java
@@ -753,6 +753,37 @@ 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
+ player.playerNaturallySpawnedEvent = event;
+ }
+ // Paper end - optimize isOutisdeRange
this.world.getMethodProfiler().enter("pollingChunks");
int k = this.world.getGameRules().getInt(GameRules.RANDOM_TICK_SPEED);
boolean flag2 = world.ticksPerAnimalSpawns != 0L && worlddata.getTime() % world.ticksPerAnimalSpawns == 0L; // CraftBukkit
@@ -782,15 +813,7 @@ public class ChunkProviderServer extends IChunkProvider {
this.world.getMethodProfiler().exit();
//List<PlayerChunk> list = Lists.newArrayList(this.playerChunkMap.f()); // Paper
//Collections.shuffle(list); // Paper
- //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.getPlayers()) {
- entityPlayer.playerNaturallySpawnedEvent = new com.destroystokyo.paper.event.entity.PlayerNaturallySpawnCreaturesEvent(entityPlayer.getBukkitEntity(), (byte) chunkRange);
- entityPlayer.playerNaturallySpawnedEvent.callEvent();
- };
- // Paper end
+ // Paper - moved up
this.world.timings.chunkTicks.startTiming(); // Paper
final int[] chunksTicked = {0}; this.playerChunkMap.forEachVisibleChunk((playerchunk) -> { // Paper - safe iterator incase chunk loads, also no wrapping
Optional<Chunk> optional = ((Either) playerchunk.a().getNow(PlayerChunk.UNLOADED_CHUNK)).left();
@@ -807,9 +830,9 @@ public class ChunkProviderServer extends IChunkProvider {
Chunk chunk = (Chunk) optional1.get();
ChunkCoordIntPair chunkcoordintpair = playerchunk.i();
- if (!this.playerChunkMap.isOutsideOfRange(chunkcoordintpair)) {
+ if (!this.playerChunkMap.isOutsideOfRange(playerchunk, chunkcoordintpair, false)) { // Paper - optimise isOutsideOfRange
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
SpawnerCreature.a(this.world, chunk, spawnercreature_d, this.allowAnimals, this.allowMonsters, flag2);
}
diff --git a/src/main/java/net/minecraft/server/level/EntityPlayer.java b/src/main/java/net/minecraft/server/level/EntityPlayer.java
index 39fb3a1445338c3ac1642b8e518eb8d1031f9a5c..62ed75ae7ec492d8502776fdf3cf3ee461a38a53 100644
--- a/src/main/java/net/minecraft/server/level/EntityPlayer.java
+++ b/src/main/java/net/minecraft/server/level/EntityPlayer.java
@@ -250,6 +250,8 @@ 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(worldserver, worldserver.getSpawn(), worldserver.v(), gameprofile);
this.spawnDimension = World.OVERWORLD;
diff --git a/src/main/java/net/minecraft/server/level/PlayerChunk.java b/src/main/java/net/minecraft/server/level/PlayerChunk.java
index 445dba8ed210407664904b707c36c78a76f25510..25484cac9c62e49de39fbbf506fcb3edc4ba6e65 100644
--- a/src/main/java/net/minecraft/server/level/PlayerChunk.java
+++ b/src/main/java/net/minecraft/server/level/PlayerChunk.java
@@ -70,6 +70,18 @@ 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;
@@ -86,6 +98,7 @@ 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/level/PlayerChunkMap.java b/src/main/java/net/minecraft/server/level/PlayerChunkMap.java
index 9fc74f08b912ff885c9478167c7ef173c32f1654..a6bb8e3b9e73f81bfa92ac13df27e9c44dd9e311 100644
--- a/src/main/java/net/minecraft/server/level/PlayerChunkMap.java
+++ b/src/main/java/net/minecraft/server/level/PlayerChunkMap.java
@@ -210,6 +210,17 @@ public class PlayerChunkMap extends IChunkLoader implements PlayerChunk.d {
return MinecraftServer.getServer().applyTrackingRangeScale(vanilla);
}
// 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());
@@ -223,6 +234,9 @@ 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) {
@@ -231,6 +245,10 @@ 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) {
@@ -245,6 +263,9 @@ 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
}
// Paper end
@@ -276,7 +297,7 @@ 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.getDimensionManager().hasSkyLight(), 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, flag, this.world); // Paper
this.setViewDistance(i);
@@ -320,6 +341,38 @@ 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) {
@@ -339,6 +392,7 @@ 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);
@@ -517,6 +571,7 @@ public class PlayerChunkMap extends IChunkLoader implements PlayerChunk.d {
} else {
if (playerchunk != null) {
playerchunk.a(j);
+ playerchunk.updateRanges(); // Paper - optimise isOutsideOfRange
}
if (playerchunk != null) {
@@ -1495,30 +1550,53 @@ 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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