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0708fa363b
Upstream has released updates that appears to apply and compile correctly. This update has not been tested by PaperMC and as with ANY update, please do your own testing CraftBukkit Changes:eb2e6578SPIGOT-5116: Fix concurrent modification exception inside ChunkMapDistance989f9b3dSPIGOT-4849: Fix server crash when accessing chunks during chunk load/unload/populate eventsf554183cSPIGOT-5171: Don't fire PlayerTeleportEvent if not actually moving2349feb8SPIGOT-5163: Cancelling PlayerBucketFillEvent visually removes the targeted block Spigot Changes: 9a643a6a Remove DataWatcher Locking
103 lines
4.5 KiB
Diff
103 lines
4.5 KiB
Diff
From 7fa3516421d9d62ad415369eb24d8b79439f8d20 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 734e7ecf6..8570e38f4 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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2.22.0
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