137 lines
6.5 KiB
Diff
137 lines
6.5 KiB
Diff
From 0000000000000000000000000000000000000000 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/players/JsonList.java b/src/main/java/net/minecraft/server/players/JsonList.java
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index 52256f72b00d3b868ef1a60e15a3836197c769d9..cd35b833d3047a38be980ee550641e87bd3b9b01 100644
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--- a/src/main/java/net/minecraft/server/players/JsonList.java
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+++ b/src/main/java/net/minecraft/server/players/JsonList.java
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@@ -12,6 +12,8 @@ import java.io.BufferedReader;
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import java.io.BufferedWriter;
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import java.io.File;
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import java.io.IOException;
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+import java.lang.reflect.ParameterizedType; // Paper
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+import java.lang.reflect.Type; // Paper
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import java.nio.charset.StandardCharsets;
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import java.util.Collection;
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import java.util.Iterator;
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@@ -28,7 +30,22 @@ public abstract class JsonList<K, V extends JsonListEntry<K>> {
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protected static final Logger LOGGER = LogManager.getLogger();
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private static final Gson b = (new GsonBuilder()).setPrettyPrinting().create();
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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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+ return new Type[]{JsonListEntry.class};
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+ }
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+
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+ public Type getRawType() {
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+ return List.class;
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+ }
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+
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+ public Type getOwnerType() {
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+ return null;
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+ }
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+ };
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public JsonList(File file) {
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this.c = file;
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@@ -51,8 +68,13 @@ public abstract 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.g();
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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.g();
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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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@@ -81,9 +103,11 @@ public abstract 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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@@ -92,8 +116,9 @@ public abstract 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() { g(); } // Paper - OBFHELPER
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private void g() {
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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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@@ -110,8 +135,10 @@ public abstract 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 abstract JsonListEntry<K> a(JsonObject jsonobject);
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@@ -121,6 +148,7 @@ public abstract 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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JsonArray jsonarray = new JsonArray();
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this.d.values().stream().map((jsonlistentry) -> {
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diff --git a/src/main/java/net/minecraft/server/players/PlayerList.java b/src/main/java/net/minecraft/server/players/PlayerList.java
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index 80934fc662b33b1c88dd7a3033792d612a7c7930..2299581fa889c0e8ddc6b2cc1d3551d02ff8dc2d 100644
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--- a/src/main/java/net/minecraft/server/players/PlayerList.java
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+++ b/src/main/java/net/minecraft/server/players/PlayerList.java
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@@ -618,7 +618,7 @@ public abstract class PlayerList {
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} else if (!this.isWhitelisted(gameprofile, event)) { // Paper
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//chatmessage = new ChatMessage("multiplayer.disconnect.not_whitelisted"); // Paper
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//event.disallow(PlayerLoginEvent.Result.KICK_WHITELIST, org.spigotmc.SpigotConfig.whitelistMessage); // Spigot // Paper - moved to isWhitelisted
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- } else if (getIPBans().isBanned(socketaddress) && !getIPBans().get(socketaddress).hasExpired()) {
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+ } else if (getIPBans().isBanned(socketaddress) && getIPBans().get(socketaddress) != null && !getIPBans().get(socketaddress).hasExpired()) { // Paper - fix NPE with temp ip bans
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IpBanEntry ipbanentry = this.l.get(socketaddress);
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chatmessage = new ChatMessage("multiplayer.disconnect.banned_ip.reason", new Object[]{ipbanentry.getReason()});
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