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103 lines
4.5 KiB
Diff
103 lines
4.5 KiB
Diff
From 8c73232c2470b81a1f291eb84e712488deabb722 Mon Sep 17 00:00:00 2001
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From: egg82 <phantom_zero@ymail.com>
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Date: Tue, 7 Aug 2018 01:24:23 -0600
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Subject: [PATCH] Use ConcurrentHashMap in JsonList
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This is specifically aimed at fixing #471
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Using a ConcurrentHashMap because thread safety
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The performance benefit of Map over ConcurrentMap is negligabe at best in this scenaio, as most operations will be get and not add or remove
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Even without considering the use-case the benefits are still negligable
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Original ideas for the system included an expiration policy and/or handler
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The simpler solution was to use a computeIfPresent in the get method
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This will simultaneously have an O(1) lookup time and automatically expire any values
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Since the get method (nor other similar methods) don't seem to have a critical need to flush the map to disk at any of these points further processing is simply wasteful
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Meaning the original function expired values unrelated to the current value without actually having any explicit need to
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The h method was heavily modified to be much more efficient in its processing
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Also instead of being called on every get, it's now called just before a save
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This will eliminate stale values being flushed to disk
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Modified isEmpty to use the isEmpty() method instead of the slightly confusing size() < 1
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The point of this is readability, but does have a side-benefit of a small microptimization
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Finally, added a couple obfhelpers for the modified code
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diff --git a/src/main/java/net/minecraft/server/JsonList.java b/src/main/java/net/minecraft/server/JsonList.java
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index 734e7ecf63..8570e38f42 100644
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--- a/src/main/java/net/minecraft/server/JsonList.java
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+++ b/src/main/java/net/minecraft/server/JsonList.java
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@@ -35,7 +35,8 @@ public class JsonList<K, V extends JsonListEntry<K>> {
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protected static final Logger LOGGER = LogManager.getLogger();
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protected final Gson b;
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private final File c;
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- private final Map<String, V> d = Maps.newHashMap();
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+ // Paper - replace HashMap is ConcurrentHashMap
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+ private final Map<String, V> d = Maps.newConcurrentMap(); private final Map<String, V> getBackingMap() { return this.d; } // Paper - OBFHELPER
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private boolean e = true;
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private static final ParameterizedType f = new ParameterizedType() {
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public Type[] getActualTypeArguments() {
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@@ -84,8 +85,13 @@ public class JsonList<K, V extends JsonListEntry<K>> {
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@Nullable
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public V get(K k0) {
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- this.h();
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- return (V) this.d.get(this.a(k0)); // CraftBukkit - fix decompile error
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+ // Paper start
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+ // this.h();
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+ // return (V) this.d.get(this.a(k0)); // CraftBukkit - fix decompile error
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+ return (V) this.getBackingMap().computeIfPresent(this.getMappingKey(k0), (k, v) -> {
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+ return v.hasExpired() ? null : v;
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+ });
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+ // Paper end
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}
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public void remove(K k0) {
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@@ -114,9 +120,11 @@ public class JsonList<K, V extends JsonListEntry<K>> {
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// CraftBukkit end
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public boolean isEmpty() {
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- return this.d.size() < 1;
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+ // return this.d.size() < 1; // Paper
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+ return this.getBackingMap().isEmpty(); // Paper - readability is the goal. As an aside, isEmpty() uses only sumCount() and a comparison. size() uses sumCount(), casts, and boolean logic
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}
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+ protected final String getMappingKey(K k0) { return a(k0); } // Paper - OBFHELPER
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protected String a(K k0) {
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return k0.toString();
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}
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@@ -125,8 +133,9 @@ public class JsonList<K, V extends JsonListEntry<K>> {
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return this.d.containsKey(this.a(k0));
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}
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+ private void removeStaleEntries() { h(); } // Paper - OBFHELPER
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private void h() {
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- List<K> list = Lists.newArrayList();
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+ /*List<K> list = Lists.newArrayList();
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Iterator iterator = this.d.values().iterator();
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while (iterator.hasNext()) {
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@@ -143,8 +152,10 @@ public class JsonList<K, V extends JsonListEntry<K>> {
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K k0 = (K) iterator.next(); // CraftBukkit - decompile error
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this.d.remove(this.a(k0));
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- }
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+ }*/
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+ this.getBackingMap().values().removeIf(JsonListEntry::hasExpired);
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+ // Paper end
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}
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protected JsonListEntry<K> a(JsonObject jsonobject) {
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@@ -156,6 +167,7 @@ public class JsonList<K, V extends JsonListEntry<K>> {
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}
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public void save() throws IOException {
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+ this.removeStaleEntries(); // Paper - remove expired values before saving
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Collection<V> collection = this.d.values();
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String s = this.b.toJson(collection);
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BufferedWriter bufferedwriter = null;
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--
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2.25.1
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