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Paper/CraftBukkit-Patches/0010-LongHash-Tweaks.patch

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From 0c3794fe2fabe95056ec884d1b83e4ac4560b699 Mon Sep 17 00:00:00 2001
From: md_5 <md_5@live.com.au>
Date: Fri, 21 Jun 2013 17:13:47 +1000
Subject: [PATCH] LongHash Tweaks
Tweaks the LongHash algorithm and provides a large array based map to look up values centered around the origin, ie the access normally seen on a Minecraft server.
diff --git a/src/main/java/org/bukkit/craftbukkit/util/LongHash.java b/src/main/java/org/bukkit/craftbukkit/util/LongHash.java
index 691cafd..9d54472 100644
--- a/src/main/java/org/bukkit/craftbukkit/util/LongHash.java
+++ b/src/main/java/org/bukkit/craftbukkit/util/LongHash.java
@@ -10,6 +10,6 @@ public class LongHash {
}
public static int lsw(long l) {
- return (int) (l & 0xFFFFFFFF) + Integer.MIN_VALUE;
+ return (int) (l) + Integer.MIN_VALUE; // Spigot - remove redundant &
}
}
diff --git a/src/main/java/org/bukkit/craftbukkit/util/LongHashSet.java b/src/main/java/org/bukkit/craftbukkit/util/LongHashSet.java
index 22c96c5..7f659b7 100644
--- a/src/main/java/org/bukkit/craftbukkit/util/LongHashSet.java
+++ b/src/main/java/org/bukkit/craftbukkit/util/LongHashSet.java
@@ -31,6 +31,7 @@ public class LongHashSet {
private int elements;
private long[] values;
private int modCount;
+ private org.spigotmc.FlatMap<Boolean> flat = new org.spigotmc.FlatMap<Boolean>(); // Spigot
public LongHashSet() {
this(INITIAL_SIZE);
@@ -56,10 +57,30 @@ public class LongHashSet {
}
public boolean contains(int msw, int lsw) {
+ // Spigot start
+ if ( elements == 0 )
+ {
+ return false;
+ }
+ if ( flat.contains( msw, lsw ) )
+ {
+ return true;
+ }
+ // Spigot end
return contains(LongHash.toLong(msw, lsw));
}
public boolean contains(long value) {
+ // Spigot start
+ if ( elements == 0 )
+ {
+ return false;
+ }
+ if ( flat.contains( value ) )
+ {
+ return true;
+ }
+ // Spigot end
int hash = hash(value);
int index = (hash & 0x7FFFFFFF) % values.length;
int offset = 1;
@@ -82,6 +103,7 @@ public class LongHashSet {
}
public boolean add(long value) {
+ flat.put( value, Boolean.TRUE ); // Spigot
int hash = hash(value);
int index = (hash & 0x7FFFFFFF) % values.length;
int offset = 1;
@@ -125,10 +147,18 @@ public class LongHashSet {
}
public void remove(int msw, int lsw) {
- remove(LongHash.toLong(msw, lsw));
+ // Spigot start
+ flat.remove(msw, lsw);
+ remove0(LongHash.toLong(msw, lsw));
}
public boolean remove(long value) {
+ flat.remove(value);
+ return remove0(value);
+ }
+
+ private boolean remove0(long value) {
+ // Spigot end
int hash = hash(value);
int index = (hash & 0x7FFFFFFF) % values.length;
int offset = 1;
@@ -161,6 +191,7 @@ public class LongHashSet {
freeEntries = values.length;
modCount++;
+ flat = new org.spigotmc.FlatMap<Boolean>();
}
public long[] toArray() {
diff --git a/src/main/java/org/bukkit/craftbukkit/util/LongObjectHashMap.java b/src/main/java/org/bukkit/craftbukkit/util/LongObjectHashMap.java
index 01861cc..2e5b436 100644
--- a/src/main/java/org/bukkit/craftbukkit/util/LongObjectHashMap.java
+++ b/src/main/java/org/bukkit/craftbukkit/util/LongObjectHashMap.java
@@ -28,6 +28,7 @@ public class LongObjectHashMap<V> implements Cloneable, Serializable {
private transient V[][] values;
private transient int modCount;
private transient int size;
+ private transient org.spigotmc.FlatMap<V> flat = new org.spigotmc.FlatMap<V>(); // Spigot
public LongObjectHashMap() {
initialize();
@@ -61,6 +62,17 @@ public class LongObjectHashMap<V> implements Cloneable, Serializable {
}
public V get(long key) {
+ // Spigot start
+ if ( size == 0 )
+ {
+ return null;
+ }
+ V val = flat.get( key );
+ if ( val != null )
+ {
+ return val;
+ }
+ // Spigot end
int index = (int) (keyIndex(key) & (BUCKET_SIZE - 1));
long[] inner = keys[index];
if (inner == null) return null;
@@ -78,6 +90,7 @@ public class LongObjectHashMap<V> implements Cloneable, Serializable {
}
public V put(long key, V value) {
+ flat.put(key, value); // Spigot
int index = (int) (keyIndex(key) & (BUCKET_SIZE - 1));
long[] innerKeys = keys[index];
V[] innerValues = values[index];
@@ -124,6 +137,7 @@ public class LongObjectHashMap<V> implements Cloneable, Serializable {
}
public V remove(long key) {
+ flat.remove(key); // Spigot
int index = (int) (keyIndex(key) & (BUCKET_SIZE - 1));
long[] inner = keys[index];
if (inner == null) {
@@ -174,6 +188,7 @@ public class LongObjectHashMap<V> implements Cloneable, Serializable {
size = 0;
Arrays.fill(keys, null);
Arrays.fill(values, null);
+ flat = new org.spigotmc.FlatMap<V>();
}
public Set<Long> keySet() {
diff --git a/src/main/java/org/spigotmc/FlatMap.java b/src/main/java/org/spigotmc/FlatMap.java
new file mode 100644
index 0000000..9416f6e
--- /dev/null
+++ b/src/main/java/org/spigotmc/FlatMap.java
@@ -0,0 +1,64 @@
+package org.spigotmc;
+
+import org.bukkit.craftbukkit.util.LongHash;
+
+public class FlatMap<V>
+{
+
+ private static final int FLAT_LOOKUP_SIZE = 512;
+ private final Object[][] flatLookup = new Object[ FLAT_LOOKUP_SIZE * 2 ][ FLAT_LOOKUP_SIZE * 2 ];
+
+ public void put(long msw, long lsw, V value)
+ {
+ long acx = Math.abs( msw );
+ long acz = Math.abs( lsw );
+ if ( acx < FLAT_LOOKUP_SIZE && acz < FLAT_LOOKUP_SIZE )
+ {
+ flatLookup[(int) ( msw + FLAT_LOOKUP_SIZE )][(int) ( lsw + FLAT_LOOKUP_SIZE )] = value;
+ }
+ }
+
+ public void put(long key, V value)
+ {
+ put( LongHash.msw( key ), LongHash.lsw( key ), value );
+
+ }
+
+ public void remove(long key)
+ {
+ put( key, null );
+ }
+
+ public void remove(long msw, long lsw)
+ {
+ put( msw, lsw, null );
+ }
+
+ public boolean contains(long msw, long lsw)
+ {
+ return get( msw, lsw ) != null;
+ }
+
+ public boolean contains(long key)
+ {
+ return get( key ) != null;
+ }
+
+ public V get(long msw, long lsw)
+ {
+ long acx = Math.abs( msw );
+ long acz = Math.abs( lsw );
+ if ( acx < FLAT_LOOKUP_SIZE && acz < FLAT_LOOKUP_SIZE )
+ {
+ return (V) flatLookup[(int) ( msw + FLAT_LOOKUP_SIZE )][(int) ( lsw + FLAT_LOOKUP_SIZE )];
+ } else
+ {
+ return null;
+ }
+ }
+
+ public V get(long key)
+ {
+ return get( LongHash.msw( key ), LongHash.lsw( key ) );
+ }
+}
--
1.9.1
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