mirror of
https://github.com/PaperMC/Waterfall.git
synced 2024-11-05 01:59:37 +01:00
272 lines
8.0 KiB
Diff
272 lines
8.0 KiB
Diff
From 983fddb8db3706b766527f8328ed7556dbb58639 Mon Sep 17 00:00:00 2001
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From: Techcable <Techcable@techcable.net>
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Date: Mon, 25 Apr 2016 23:46:00 -0700
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Subject: [PATCH] Reduce the overhead of lots and lots of teams with the same
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names
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Featherboard (and other bad plugins) use persistent scoreboards (scoreboard.dat), causing every team ever to be sent to waterfall. This is bad, and takes tons of memory.
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Uses String.intern() to avoid duplicating strings
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Uses a sorted array to avoid the overhead of the hashset in a team.
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diff --git a/api/src/main/java/io/github/waterfallmc/waterfall/utils/LowMemorySet.java b/api/src/main/java/io/github/waterfallmc/waterfall/utils/LowMemorySet.java
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new file mode 100644
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index 0000000..a1b6981
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--- /dev/null
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+++ b/api/src/main/java/io/github/waterfallmc/waterfall/utils/LowMemorySet.java
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@@ -0,0 +1,151 @@
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+package io.github.waterfallmc.waterfall.utils;
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+
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+import java.util.AbstractSet;
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+import java.util.ArrayList;
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+import java.util.Collection;
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+import java.util.Collections;
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+import java.util.Iterator;
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+import java.util.List;
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+import java.util.Set;
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+import java.util.function.Consumer;
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+import java.util.function.Predicate;
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+import java.util.stream.Stream;
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+
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+import static com.google.common.base.Preconditions.checkNotNull;
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+
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+/**
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+ * A set that uses a <a href=>binary search</a> to find objects in a <a href=https://en.wikipedia.org/wiki/Sorted_array>sorted array</a>.
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+ * Avoids the memory cost of {@link java.util.HashSet}, while maintaining reasonable {@link Set#contains}
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+ * <b>Insertions are O(N)!</b>
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+ */
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+public class LowMemorySet<T extends Comparable<T>> extends AbstractSet<T> implements Set<T> {
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+ private final List<T> backing;
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+
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+ private LowMemorySet(List<T> list) {
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+ this.backing = checkNotNull(list, "Null list");
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+ this.sort(); // We have to sort any initial elements
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+ }
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+
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+ public static <T extends Comparable<T>> LowMemorySet<T> create() {
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+ return new LowMemorySet<>(new ArrayList<T>());
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+ }
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+
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+ public static <T extends Comparable<T>> LowMemorySet<T> copyOf(Collection<T> c) {
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+ return new LowMemorySet<>(new ArrayList<>(c));
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+ }
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+
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+ @SuppressWarnings({"unchecked", "rawtypes"})
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+ private int indexOf(Object o) {
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+ return Collections.binarySearch((List) backing, o);
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+ }
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+
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+ private void sort() {
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+ backing.sort(null);
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+ }
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+
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+ @Override
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+ public int size() {
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+ return backing.size();
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+ }
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+
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+ @Override
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+ public boolean contains(Object o) {
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+ return indexOf(o) >= 0;
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+ }
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+
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+ @Override
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+ public Iterator<T> iterator() {
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+ Iterator<T> backing = this.backing.iterator();
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+ return new Iterator<T>() {
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+ @Override
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+ public boolean hasNext() {
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+ return backing.hasNext();
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+ }
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+
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+ @Override
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+ public T next() {
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+ return backing.next();
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+ }
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+
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+ @Override
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+ public void remove() {
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+ backing.remove();
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+ }
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+
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+ @Override
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+ public void forEachRemaining(Consumer<? super T> action) {
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+ backing.forEachRemaining(action);
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+ }
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+ };
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+ }
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+
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+ @Override
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+ public Object[] toArray() {
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+ return backing.toArray();
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+ }
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+
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+ @Override
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+ public <T1> T1[] toArray(T1[] a) {
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+ return backing.toArray(a);
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+ }
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+
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+ @Override
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+ public boolean add(T t) {
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+ if (contains(t)) return false;
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+ backing.add(t);
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+ this.sort();
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+ return true;
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+ }
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+
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+ @Override
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+ public boolean remove(Object o) {
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+ int index = indexOf(o);
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+ if (index < 0) return false;
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+ T old = backing.remove(index);
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+ assert old == o;
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+ return old != null;
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+ }
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+
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+ @Override
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+ public boolean removeAll(Collection<?> c) {
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+ return backing.removeIf(c::contains);
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+ }
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+
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+ @Override
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+ public boolean retainAll(Collection<?> c) {
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+ return backing.removeIf((o) -> !c.contains(o));
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+ }
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+
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+ @Override
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+ public boolean addAll(Collection<? extends T> c) {
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+ if (containsAll(c)) return false;
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+ backing.addAll(c);
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+ this.sort();
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+ return true;
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+ }
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+
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+ @Override
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+ public void clear() {
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+ backing.clear();
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+ }
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+
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+ @Override
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+ public void forEach(Consumer<? super T> action) {
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+ backing.forEach(action);
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+ }
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+
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+ @Override
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+ public Stream<T> stream() {
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+ return backing.stream();
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+ }
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+
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+ @Override
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+ public Stream<T> parallelStream() {
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+ return backing.parallelStream();
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+ }
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+
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+ @Override
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+ public boolean removeIf(Predicate<? super T> filter) {
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+ return backing.removeIf(filter);
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+ }
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+}
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diff --git a/api/src/main/java/net/md_5/bungee/api/score/Team.java b/api/src/main/java/net/md_5/bungee/api/score/Team.java
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index 4166037..f0f019b 100644
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--- a/api/src/main/java/net/md_5/bungee/api/score/Team.java
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+++ b/api/src/main/java/net/md_5/bungee/api/score/Team.java
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@@ -1,11 +1,12 @@
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package net.md_5.bungee.api.score;
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+import lombok.*;
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+
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import java.util.Collection;
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import java.util.Collections;
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-import java.util.HashSet;
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import java.util.Set;
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-import lombok.Data;
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-import lombok.NonNull;
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+
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+import io.github.waterfallmc.waterfall.utils.LowMemorySet;
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@Data
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public class Team
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@@ -20,7 +21,7 @@ public class Team
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private String nameTagVisibility;
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private String collisionRule;
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private byte color;
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- private Set<String> players = new HashSet<>();
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+ private Set<String> players = LowMemorySet.create();
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public Collection<String> getPlayers()
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{
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@@ -29,7 +30,7 @@ public class Team
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public void addPlayer(String name)
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{
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- players.add( name );
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+ players.add(name.intern());
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}
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public void removePlayer(String name)
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diff --git a/api/src/test/java/io/github/waterfallmc/waterfall/utils/LowMemorySetTest.java b/api/src/test/java/io/github/waterfallmc/waterfall/utils/LowMemorySetTest.java
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new file mode 100644
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index 0000000..5aa306a
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--- /dev/null
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+++ b/api/src/test/java/io/github/waterfallmc/waterfall/utils/LowMemorySetTest.java
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@@ -0,0 +1,56 @@
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+package io.github.waterfallmc.waterfall.utils;
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+
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+import com.google.common.collect.ImmutableList;
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+import com.google.common.collect.ImmutableMap;
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+
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+import org.junit.Test;
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+
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+import static org.junit.Assert.*;
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+
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+public class LowMemorySetTest {
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+
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+ private static final ImmutableList<String> ELEMENTS = ImmutableList.of("test", "bob", "road", "food", "sleep", "sore-thought", "pain");
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+
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+ @Test
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+ public void testContains() {
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+ LowMemorySet<String> set = LowMemorySet.copyOf(ELEMENTS);
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+ assertTrue(set.contains("test"));
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+ assertTrue(set.contains("bob"));
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+ assertFalse(set.contains("stupid"));
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+ assertFalse(set.contains("head"));
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+ }
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+
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+ @Test
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+ public void testRemove() {
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+ LowMemorySet<String> set = LowMemorySet.copyOf(ELEMENTS);
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+ assertTrue(set.contains("test"));
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+ set.remove("test");
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+ assertFalse(set.contains("test"));
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+ assertTrue(set.contains("bob"));
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+ set.remove("bob");
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+ assertFalse(set.contains("bob"));
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+ assertTrue(ELEMENTS.size() - set.size() == 2);
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+ assertTrue(set.contains("road"));
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+ assertTrue(set.contains("food"));
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+ assertTrue(set.contains("pain"));
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+ set.removeAll(ImmutableList.of("road", "food", "pain"));
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+ assertFalse(set.contains("road"));
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+ assertFalse(set.contains("food"));
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+ assertFalse(set.contains("pain"));
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+ assertTrue(ELEMENTS.size() - set.size() == 5);
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+ }
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+
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+ @Test
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+ public void testAdd() {
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+ LowMemorySet<String> set = LowMemorySet.copyOf(ELEMENTS);
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+ assertFalse(set.contains("Techcable"));
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+ set.add("Techcable");
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+ assertTrue(set.contains("Techcable"));
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+ set.addAll(ImmutableList.of("Techcable", "PhanaticD", "Dragonslayer293", "Aikar"));
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+ assertTrue(set.contains("Techcable"));
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+ assertTrue(set.contains("PhanaticD"));
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+ assertTrue(set.contains("Aikar"));
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+ assertFalse(set.contains("md_5"));
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+ }
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+
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+}
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--
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2.7.4
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