Performance update to remove several very high counts of temp object creation

src/main/java/net/minecraft/server/EntityLiving.java

@@ -175,7 +175,9 @@ public abstract class EntityLiving extends Entity {
 
             this.extinguish();
         } else {
-            this.setAirTicks(maxAirTicks); // CraftBukkit - update maxAirTicks if no longer 300
+            if (this.getAirTicks() != 300) {
+                this.setAirTicks(maxAirTicks);
+            }
         }
 
         this.aw = this.ax;

src/main/java/net/minecraft/server/EntityTracker.java

@@ -11,9 +11,9 @@ public class EntityTracker {
     private IntHashMap trackedEntities = new IntHashMap();
     private MinecraftServer c;
     private int d;
-    private int e;
+    private World e; // CraftBukkit - change type
 
-    public EntityTracker(MinecraftServer minecraftserver, int i) {
+    public EntityTracker(MinecraftServer minecraftserver, World i) { // CraftBukkit - change method signature
         this.c = minecraftserver;
         this.e = i;
         this.d = minecraftserver.serverConfigurationManager.a();
@@ -94,7 +94,7 @@ public class EntityTracker {
 
             this.a.add(entitytrackerentry);
             this.trackedEntities.a(entity.id, entitytrackerentry);
-            entitytrackerentry.scanPlayers(this.c.getWorldServer(this.e).players);
+            entitytrackerentry.scanPlayers(this.e.players); // CraftBukkit
         }
     }
 
@@ -127,7 +127,7 @@ public class EntityTracker {
         while (iterator.hasNext()) {
             EntityTrackerEntry entitytrackerentry = (EntityTrackerEntry) iterator.next();
 
-            entitytrackerentry.track(this.c.getWorldServer(this.e).players);
+            entitytrackerentry.track(this.e.players); // CraftBukkit
             if (entitytrackerentry.m && entitytrackerentry.tracker instanceof EntityPlayer) {
                 arraylist.add((EntityPlayer) entitytrackerentry.tracker);
             }

src/main/java/net/minecraft/server/MinecraftServer.java

@@ -267,7 +267,7 @@ public class MinecraftServer implements Runnable, ICommandListener, IMinecraftSe
 
             this.server.getPluginManager().callEvent(new WorldInitEvent(world.getWorld()));
 
-            world.tracker = new EntityTracker(this, dimension);
+            world.tracker = new EntityTracker(this, world); // CraftBukkit
             world.addIWorldAccess(new WorldManager(this, world));
             world.difficulty = this.propertyManager.getInt("difficulty", 1);
             world.setSpawnFlags(this.propertyManager.getBoolean("spawn-monsters", true), this.spawnAnimals);

src/main/java/net/minecraft/server/SpawnerCreature.java

@@ -1,5 +1,6 @@
 package net.minecraft.server;
 
+import java.util.ArrayList;
 import java.util.Collection;
 import java.util.HashMap;
 import java.util.Iterator;
@@ -7,11 +8,28 @@ import java.util.List;
 import java.util.Random;
 
 // CraftBukkit
+import org.bukkit.craftbukkit.util.LongAbstractHashtable;
+import org.bukkit.craftbukkit.util.EntryBase;
+import org.bukkit.craftbukkit.util.LongHash;
 import org.bukkit.event.entity.CreatureSpawnEvent.SpawnReason;
 
 public final class SpawnerCreature {
 
-    private static HashMap b = new HashMap();
+    // private static HashMap b = new HashMap(); // CraftBukkit -- moved local to spawnEntities
+    static private class ChunkEntry extends EntryBase {
+        public boolean spawn;
+        public ChunkEntry (int x, int z, boolean spawn) {
+            super(LongHash.toLong(x, z));
+            this.spawn = spawn;
+        }
+        int getX() {
+            return LongHash.msw(key);
+        }
+        int getZ() {
+            return LongHash.lsw(key);
+        }
+    }
+
     protected static final Class[] a = new Class[] { EntitySpider.class, EntityZombie.class, EntitySkeleton.class};
 
     public SpawnerCreature() {}
@@ -28,7 +46,9 @@ public final class SpawnerCreature {
         if (!flag && !flag1) {
             return 0;
         } else {
-            b.clear();
+            // b.clear(); // CraftBukkit
+            LongAbstractHashtable chunkCoords; // CraftBukkit
+            chunkCoords = new LongAbstractHashtable() {};
 
             int i;
             int j;
@@ -43,19 +63,22 @@ public final class SpawnerCreature {
                 for (int l = -b0; l <= b0; ++l) {
                     for (int i1 = -b0; i1 <= b0; ++i1) {
                         boolean flag2 = l == -b0 || l == b0 || i1 == -b0 || i1 == b0;
-                        ChunkCoordIntPair chunkcoordintpair = new ChunkCoordIntPair(l + k, i1 + j);
+                        // CraftBukkit start
+                        long chunkCoord = LongHash.toLong(l + k, i1 + j);
 
                         if (!flag2) {
-                            b.put(chunkcoordintpair, Boolean.valueOf(false));
-                        } else if (!b.containsKey(chunkcoordintpair)) {
-                            b.put(chunkcoordintpair, Boolean.valueOf(true));
+                            chunkCoords.put(new ChunkEntry(l + k, i1 + j, false));
+                        } else if (!chunkCoords.containsKey(chunkCoord)) {
+                            chunkCoords.put(new ChunkEntry(l + k, i1 + j, true));
                         }
+                        // CraftBukkit end
                     }
                 }
             }
 
             i = 0;
             ChunkCoordinates chunkcoordinates = world.getSpawn();
+            ArrayList<EntryBase> entries = chunkCoords.entries(); // CraftBukkit
             EnumCreatureType[] aenumcreaturetype = EnumCreatureType.values();
 
             j = aenumcreaturetype.length;
@@ -63,15 +86,14 @@ public final class SpawnerCreature {
             for (int j1 = 0; j1 < j; ++j1) {
                 EnumCreatureType enumcreaturetype = aenumcreaturetype[j1];
 
-                if ((!enumcreaturetype.d() || flag1) && (enumcreaturetype.d() || flag) && world.a(enumcreaturetype.a()) <= enumcreaturetype.b() * b.size() / 256) {
-                    Iterator iterator = b.keySet().iterator();
+
+                if ((!enumcreaturetype.d() || flag1) && (enumcreaturetype.d() || flag) && world.a(enumcreaturetype.a()) <= enumcreaturetype.b() * entries.size() / 256) {
 
                     label108:
-                    while (iterator.hasNext()) {
-                        ChunkCoordIntPair chunkcoordintpair1 = (ChunkCoordIntPair) iterator.next();
-
-                        if (!((Boolean) b.get(chunkcoordintpair1)).booleanValue()) {
-                            ChunkPosition chunkposition = a(world, chunkcoordintpair1.x * 16, chunkcoordintpair1.z * 16);
+                    for (EntryBase base : entries) {
+                        ChunkEntry entry = (SpawnerCreature.ChunkEntry) base;
+                        if (!entry.spawn) {
+                            ChunkPosition chunkposition = a(world, LongHash.msw(entry.getX()) * 16, entry.getZ() * 16);
                             int k1 = chunkposition.x;
                             int l1 = chunkposition.y;
                             int i2 = chunkposition.z;

src/main/java/net/minecraft/server/World.java

@@ -14,6 +14,8 @@ import java.util.UUID;
 
 import org.bukkit.Bukkit;
 import org.bukkit.Location;
+import org.bukkit.craftbukkit.util.LongHash;
+import org.bukkit.craftbukkit.util.LongHashset;
 import org.bukkit.generator.ChunkGenerator;
 import org.bukkit.craftbukkit.CraftServer;
 import org.bukkit.craftbukkit.CraftWorld;
@@ -74,7 +76,7 @@ public class World implements IBlockAccess {
     private boolean S;
     public boolean allowMonsters; // CraftBukkit - private -> public
     public boolean allowAnimals; // CraftBukkit - private -> public
-    private Set T;
+    private LongHashset T; // CraftBukkit
     private int U;
     int[] H;
     private List V;
@@ -145,7 +147,7 @@ public class World implements IBlockAccess {
         this.R = new ArrayList();
         this.allowMonsters = true;
         this.allowAnimals = true;
-        this.T = new HashSet();
+        this.T = new LongHashset(); // CraftBukkit
         this.U = this.random.nextInt(12000);
         this.H = new int['\u8000'];
         this.V = new ArrayList();
@@ -1856,7 +1858,7 @@ public class World implements IBlockAccess {
     }
 
     protected void k() {
-        this.T.clear();
+        // this.T.clear(); // CraftBukkit -- removed
         // MethodProfiler.a("buildList"); // CraftBukkit -- not in production code
 
         int i;
@@ -1870,7 +1872,7 @@ public class World implements IBlockAccess {
 
             for (j = -b0; j <= b0; ++j) {
                 for (int i1 = -b0; i1 <= b0; ++i1) {
-                    this.T.add(new ChunkCoordIntPair(j + k, i1 + l));
+                    this.T.add(LongHash.toLong(j + k, i1 + l)); // CraftBukkit
                 }
             }
         }
@@ -1883,15 +1885,19 @@ public class World implements IBlockAccess {
         int j1 = 0;
 
         // MethodProfiler.a(); // CraftBukkit -- not in production code
-        Iterator iterator = this.T.iterator();
+        // Iterator iterator = this.T.iterator(); CraftBukkit == removed
 
-        while (iterator.hasNext()) {
-            ChunkCoordIntPair chunkcoordintpair = (ChunkCoordIntPair) iterator.next();
-            int k1 = chunkcoordintpair.x * 16;
+        // CraftBukkit start
+        for (long chunkCoord : this.T.popAll()) {
+            int chunkX = LongHash.msw(chunkCoord);
+            int chunkZ = LongHash.lsw(chunkCoord);
+            // ChunkCoordIntPair chunkcoordintpair = (ChunkCoordIntPair) iterator.next();
+            int k1 = chunkX * 16;
 
-            j = chunkcoordintpair.z * 16;
+            j = chunkZ * 16;
             // MethodProfiler.a("getChunk"); // CraftBukkit -- not in production code
-            Chunk chunk = this.getChunkAt(chunkcoordintpair.x, chunkcoordintpair.z);
+            Chunk chunk = this.getChunkAt(chunkX, chunkZ);
+            // CraftBukkit end
 
             // MethodProfiler.b("tickChunk"); // CraftBukkit -- not in production code
             chunk.i();

src/main/java/org/bukkit/craftbukkit/CraftServer.java

@@ -535,7 +535,7 @@ public final class CraftServer implements Server {
 
         internal.worldMaps = console.worlds.get(0).worldMaps;
 
-        internal.tracker = new EntityTracker(console, dimension);
+        internal.tracker = new EntityTracker(console, internal); // CraftBukkit
         internal.addIWorldAccess((IWorldAccess) new WorldManager(console, internal));
         internal.difficulty = 1;
         internal.setSpawnFlags(true, true);

src/main/java/org/bukkit/craftbukkit/util/EntryBase.java

@@ -0,0 +1,8 @@
+package org.bukkit.craftbukkit.util;
+
+public  class EntryBase {
+    protected long key;
+    public EntryBase(long key) {
+        this.key = key;
+    }
+}

src/main/java/org/bukkit/craftbukkit/util/LongAbstractHashtable.java

@@ -0,0 +1,115 @@
+package org.bukkit.craftbukkit.util;
+
+import net.minecraft.server.Chunk;
+import net.minecraft.server.MinecraftServer;
+
+import java.util.ArrayList;
+
+import static org.bukkit.craftbukkit.util.Java15Compat.Arrays_copyOf;
+
+public abstract class LongAbstractHashtable extends LongHash {
+
+    EntryBase[][][] values = new EntryBase[256][][];
+    EntryBase cache = null;
+
+    public void put(int msw, int lsw, EntryBase entry) {
+        put(entry);
+    }
+
+    public EntryBase getEntry(int msw, int lsw) {
+        return getEntry(toLong(msw, lsw));
+    }
+
+    public synchronized void put(EntryBase entry) {
+        int mainIdx = (int) (entry.key & 255);
+        EntryBase[][] outer = this.values[mainIdx];
+        if (outer == null) this.values[mainIdx] = outer = new EntryBase[256][];
+
+        int outerIdx = (int) ((entry.key >> 32) & 255);
+        EntryBase[] inner = outer[outerIdx];
+
+        if (inner == null) {
+            outer[outerIdx] = inner = new EntryBase[5];
+            inner[0] = this.cache = entry;
+        } else {
+            int i;
+            for (i = 0; i < inner.length; i++) {
+                if (inner[i] == null || inner[i].key == entry.key) {
+                    inner[i] = this.cache = entry;
+                    return;
+                }
+            }
+
+            outer[outerIdx] = inner = Arrays_copyOf(inner, i + i);
+            inner[i] = entry;
+        }
+    }
+
+    public synchronized EntryBase getEntry(long key) {
+        return containsKey(key) ? cache : null;
+    }
+
+    public synchronized boolean containsKey(long key) {
+        if (this.cache != null && cache.key == key) return true;
+
+        int outerIdx = (int) ((key >> 32) & 255);
+        EntryBase[][] outer = this.values[(int) (key & 255)];
+        if (outer == null) return false;
+
+        EntryBase[] inner = outer[outerIdx];
+        if (inner == null) return false;
+
+        for (int i = 0; i < inner.length; i++) {
+            EntryBase e = inner[i];
+            if (e == null) {
+                return false;
+            } else if (e.key == key) {
+                this.cache = e;
+                return true;
+            }
+        }
+        return false;
+    }
+
+    public synchronized void remove(long key) {
+        EntryBase[][] outer = this.values[(int) (key & 255)];
+        if (outer == null) return;
+
+        EntryBase[] inner = outer[(int) ((key >> 32) & 255)];
+        if (inner == null) return;
+
+        for (int i = 0; i < inner.length; i++) {
+            if (inner[i] == null) continue;
+
+            if (inner[i].key == key) {
+                for (i++; i < inner.length; i++) {
+                    if (inner[i] == null) break;
+                    inner[i-1] = inner[i];
+                }
+
+                inner[i-1] = null;
+                this.cache = null;
+                return;
+            }
+        }
+    }
+
+    public synchronized ArrayList<EntryBase> entries() {
+        ArrayList<EntryBase> ret = new ArrayList<EntryBase>();
+
+        for (EntryBase[][] outer: this.values) {
+            if (outer == null) continue;
+
+            for (EntryBase[] inner: outer) {
+                if (inner == null) continue;
+
+                for (EntryBase entry: inner) {
+                    if (entry == null) break;
+
+                    ret.add(entry);
+                }
+            }
+        }
+        return ret;
+    }
+}

src/main/java/org/bukkit/craftbukkit/util/LongHash.java

@@ -1,15 +1,15 @@
 package org.bukkit.craftbukkit.util;
 
 public abstract class LongHash {
-    static long toLong(int msw, int lsw) {
+    public static long toLong(int msw, int lsw) {
         return ((long) msw << 32) + lsw - Integer.MIN_VALUE;
     }
 
-    static int msw(long l) {
+    public static int msw(long l) {
         return (int) (l >> 32);
     }
 
-    static int lsw(long l) {
+    public static int lsw(long l) {
         return (int) (l & 0xFFFFFFFF) + Integer.MIN_VALUE;
     }
 

src/main/java/org/bukkit/craftbukkit/util/LongHashset.java

@@ -125,6 +125,31 @@ public class LongHashset extends LongHash {
         return 0;
     }
 
+    public long[] popAll() {
+        int index = 0;
+        rl.lock();
+        try {
+            long[] ret = new long[this.count];
+            for (long[][] outer: this.values) {
+                if (outer == null) continue;
+
+                for (int oIdx = outer.length - 1; oIdx >= 0; oIdx--) {
+                    long[] inner = outer[oIdx];
+                    if (inner == null) continue;
+
+                    for (long entry: inner) {
+                        ret[index++] = entry;
+                    }
+                    outer[oIdx] = null;
+                }
+            }
+            count = 0;
+            return ret;
+        } finally {
+            rl.unlock();
+        }
+    }
+
     public long[] keys() {
         int index = 0;
         rl.lock();

src/main/java/org/bukkit/craftbukkit/util/LongHashtable.java

@@ -5,136 +5,40 @@ import net.minecraft.server.Chunk;
 import net.minecraft.server.MinecraftServer;
 import static org.bukkit.craftbukkit.util.Java15Compat.Arrays_copyOf;
 
-public class LongHashtable<V> extends LongHash {
-    Object[][][] values = new Object[256][][];
-    Entry cache = null;
+public class LongHashtable<V> extends LongAbstractHashtable {
 
     public void put(int msw, int lsw, V value) {
         put(toLong(msw, lsw), value);
-        if (value instanceof Chunk) {
-            Chunk c = (Chunk) value;
-            if (msw != c.x || lsw != c.z) {
-                MinecraftServer.log.info("Chunk (" + c.x + ", " + c.z + ") stored at  (" + msw + ", " + lsw + ")");
-                Throwable x = new Throwable();
-                x.fillInStackTrace();
-                x.printStackTrace();
-            }
-        }
     }
 
     public V get(int msw, int lsw) {
-        V value = get(toLong(msw, lsw));
-        if (value instanceof Chunk) {
-            Chunk c = (Chunk) value;
-            if (msw != c.x || lsw != c.z) {
-                MinecraftServer.log.info("Chunk (" + c.x + ", " + c.z + ") stored at  (" + msw + ", " + lsw + ")");
-                Throwable x = new Throwable();
-                x.fillInStackTrace();
-                x.printStackTrace();
-            }
-        }
-        return value;
+        return get(toLong(msw, lsw));
     }
 
     public synchronized void put(long key, V value) {
-        int mainIdx = (int) (key & 255);
-        Object[][] outer = this.values[mainIdx];
-        if (outer == null) this.values[mainIdx] = outer = new Object[256][];
-
-        int outerIdx = (int) ((key >> 32) & 255);
-        Object[] inner = outer[outerIdx];
-
-        if (inner == null) {
-            outer[outerIdx] = inner = new Object[5];
-            inner[0] = this.cache = new Entry(key, value);
-        } else {
-            int i;
-            for (i = 0; i < inner.length; i++) {
-                if (inner[i] == null || ((Entry) inner[i]).key == key) {
-                    inner[i] = this.cache = new Entry(key, value);
-                    return;
-                }
-            }
-
-            outer[outerIdx] = inner = Arrays_copyOf(inner, i + i);
-            inner[i] = new Entry(key, value);
-        }
+        put(new Entry(key, value));
     }
 
     public synchronized V get(long key) {
-        return containsKey(key) ? (V) cache.value : null;
-    }
-
-    public synchronized boolean containsKey(long key) {
-        if (this.cache != null && cache.key == key) return true;
-
-        int outerIdx = (int) ((key >> 32) & 255);
-        Object[][] outer = this.values[(int) (key & 255)];
-        if (outer == null) return false;
-
-        Object[] inner = outer[outerIdx];
-        if (inner == null) return false;
-
-        for (int i = 0; i < inner.length; i++) {
-            Entry e = (Entry) inner[i];
-            if (e == null) {
-                return false;
-            } else if (e.key == key) {
-                this.cache = e;
-                return true;
-            }
-        }
-        return false;
-    }
-
-    public synchronized void remove(long key) {
-        Object[][] outer = this.values[(int) (key & 255)];
-        if (outer == null) return;
-
-        Object[] inner = outer[(int) ((key >> 32) & 255)];
-        if (inner == null) return;
-
-        for (int i = 0; i < inner.length; i++) {
-            if (inner[i] == null) continue;
-
-            if (((Entry) inner[i]).key == key) {
-                for (i++; i < inner.length; i++) {
-                    if (inner[i] == null) break;
-                    inner[i-1] = inner[i];
-                }
-
-                inner[i-1] = null;
-                this.cache = null;
-                return;
-            }
-        }
+        Entry entry = ((Entry)getEntry(key));
+        return entry != null ? entry.value : null;
     }
 
     public synchronized ArrayList<V> values() {
         ArrayList<V> ret = new ArrayList<V>();
 
-        for (Object[][] outer: this.values) {
-            if (outer == null) continue;
+        ArrayList<EntryBase> entries = entries();
 
-            for (Object[] inner: outer) {
-                if (inner == null) continue;
-
-                for (Object entry: inner) {
-                    if (entry == null) break;
-
-                    ret.add((V) ((Entry) entry).value);
-                }
-            }
+        for(EntryBase entry : entries) {
+            ret.add(((Entry)entry).value);
         }
         return ret;
     }
 
-    private class Entry {
-        long key;
-        Object value;
-
-        Entry(long k, Object v) {
-            this.key = k;
+    private class Entry extends EntryBase {
+        V value;
+        Entry(long k, V v) {
+            super(k);
             this.value = v;
         }
     }