141 lines
5.3 KiB
Diff
141 lines
5.3 KiB
Diff
From 03b486fc7abc3ecea870b646c13a2a5797ea4796 Mon Sep 17 00:00:00 2001
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From: md_5 <md_5@live.com.au>
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Date: Sat, 23 Mar 2013 09:29:43 +1100
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Subject: [PATCH] LongHash Tweaks.
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This commit adds a flat array based cache to the LongHash(Set/Map) classes leading to excellent efficiency for servers where most activity is centered around the origin (0,0)
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---
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.../java/org/bukkit/craftbukkit/util/FlatMap.java | 34 ++++++++++++++++++++++
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.../org/bukkit/craftbukkit/util/LongHashSet.java | 8 ++++-
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.../bukkit/craftbukkit/util/LongObjectHashMap.java | 5 ++++
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3 files changed, 46 insertions(+), 1 deletion(-)
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create mode 100644 src/main/java/org/bukkit/craftbukkit/util/FlatMap.java
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diff --git a/src/main/java/org/bukkit/craftbukkit/util/FlatMap.java b/src/main/java/org/bukkit/craftbukkit/util/FlatMap.java
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new file mode 100644
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index 0000000..e8a7725
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--- /dev/null
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+++ b/src/main/java/org/bukkit/craftbukkit/util/FlatMap.java
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@@ -0,0 +1,34 @@
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+package org.bukkit.craftbukkit.util;
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+
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+public class FlatMap<V> {
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+
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+ private static final int FLAT_LOOKUP_SIZE = 512;
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+ private final Object[][] flatLookup = new Object[FLAT_LOOKUP_SIZE * 2][FLAT_LOOKUP_SIZE * 2];
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+
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+ public void put(long msw, long lsw, V value) {
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+ long acx = Math.abs(msw);
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+ long acz = Math.abs(lsw);
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+ if (acx < FLAT_LOOKUP_SIZE && acz < FLAT_LOOKUP_SIZE) {
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+ flatLookup[(int) (msw + FLAT_LOOKUP_SIZE)][(int) (lsw + FLAT_LOOKUP_SIZE)] = value;
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+ }
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+ }
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+
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+ public void put(long key, V value) {
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+ put(LongHash.msw(key), LongHash.lsw(key), value);
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+
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+ }
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+
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+ public V get(long msw, long lsw) {
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+ long acx = Math.abs(msw);
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+ long acz = Math.abs(lsw);
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+ if (acx < FLAT_LOOKUP_SIZE && acz < FLAT_LOOKUP_SIZE) {
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+ return (V) flatLookup[(int) (msw + FLAT_LOOKUP_SIZE)][(int) (lsw + FLAT_LOOKUP_SIZE)];
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+ } else {
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+ return null;
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+ }
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+ }
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+
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+ public V get(long key) {
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+ return get(LongHash.msw(key), LongHash.lsw(key));
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+ }
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+}
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diff --git a/src/main/java/org/bukkit/craftbukkit/util/LongHashSet.java b/src/main/java/org/bukkit/craftbukkit/util/LongHashSet.java
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index 22c96c5..331d570 100644
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--- a/src/main/java/org/bukkit/craftbukkit/util/LongHashSet.java
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+++ b/src/main/java/org/bukkit/craftbukkit/util/LongHashSet.java
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@@ -31,6 +31,8 @@ public class LongHashSet {
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private int elements;
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private long[] values;
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private int modCount;
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+ private static final Object PRESENT = new Object();
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+ private final FlatMap<Object> flat = new FlatMap<Object>();
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public LongHashSet() {
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this(INITIAL_SIZE);
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@@ -56,10 +58,12 @@ public class LongHashSet {
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}
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public boolean contains(int msw, int lsw) {
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+ if (flat.get(msw, lsw) != null) return true; // Spigot
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return contains(LongHash.toLong(msw, lsw));
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}
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public boolean contains(long value) {
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+ if (flat.get(value) != null) return true; // Spigot
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int hash = hash(value);
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int index = (hash & 0x7FFFFFFF) % values.length;
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int offset = 1;
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@@ -82,6 +86,7 @@ public class LongHashSet {
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}
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public boolean add(long value) {
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+ flat.put(value, PRESENT); // Spigot
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int hash = hash(value);
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int index = (hash & 0x7FFFFFFF) % values.length;
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int offset = 1;
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@@ -125,10 +130,11 @@ public class LongHashSet {
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}
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public void remove(int msw, int lsw) {
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+ flat.put(msw, lsw, null); // Spigot
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remove(LongHash.toLong(msw, lsw));
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}
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- public boolean remove(long value) {
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+ private boolean remove(long value) { // Spigot
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int hash = hash(value);
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int index = (hash & 0x7FFFFFFF) % values.length;
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int offset = 1;
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diff --git a/src/main/java/org/bukkit/craftbukkit/util/LongObjectHashMap.java b/src/main/java/org/bukkit/craftbukkit/util/LongObjectHashMap.java
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index 01861cc..dbd33fa 100644
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--- a/src/main/java/org/bukkit/craftbukkit/util/LongObjectHashMap.java
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+++ b/src/main/java/org/bukkit/craftbukkit/util/LongObjectHashMap.java
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@@ -28,6 +28,7 @@ public class LongObjectHashMap<V> implements Cloneable, Serializable {
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private transient V[][] values;
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private transient int modCount;
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private transient int size;
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+ private final FlatMap<V> flat = new FlatMap<V>(); // Spigot
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public LongObjectHashMap() {
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initialize();
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@@ -61,6 +62,8 @@ public class LongObjectHashMap<V> implements Cloneable, Serializable {
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}
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public V get(long key) {
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+ V val = flat.get(key); // Spigot
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+ if (val != null) return val; // Spigot
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int index = (int) (keyIndex(key) & (BUCKET_SIZE - 1));
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long[] inner = keys[index];
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if (inner == null) return null;
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@@ -78,6 +81,7 @@ public class LongObjectHashMap<V> implements Cloneable, Serializable {
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}
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public V put(long key, V value) {
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+ flat.put(key, value); // Spigot
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int index = (int) (keyIndex(key) & (BUCKET_SIZE - 1));
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long[] innerKeys = keys[index];
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V[] innerValues = values[index];
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@@ -124,6 +128,7 @@ public class LongObjectHashMap<V> implements Cloneable, Serializable {
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}
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public V remove(long key) {
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+ flat.put(key, null); // Spigot
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int index = (int) (keyIndex(key) & (BUCKET_SIZE - 1));
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long[] inner = keys[index];
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if (inner == null) {
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--
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1.8.2.1
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