From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001 From: egg82 Date: Tue, 7 Aug 2018 01:24:23 -0600 Subject: [PATCH] Use ConcurrentHashMap in JsonList This is specifically aimed at fixing #471 Using a ConcurrentHashMap because thread safety 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 Even without considering the use-case the benefits are still negligable Original ideas for the system included an expiration policy and/or handler The simpler solution was to use a computeIfPresent in the get method This will simultaneously have an O(1) lookup time and automatically expire any values 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 Meaning the original function expired values unrelated to the current value without actually having any explicit need to The h method was heavily modified to be much more efficient in its processing Also instead of being called on every get, it's now called just before a save This will eliminate stale values being flushed to disk Modified isEmpty to use the isEmpty() method instead of the slightly confusing size() < 1 The point of this is readability, but does have a side-benefit of a small microptimization Finally, added a couple obfhelpers for the modified code diff --git a/src/main/java/net/minecraft/server/JsonList.java b/src/main/java/net/minecraft/server/JsonList.java index da21918ce0339a0eb8f65ce7791a04ceb12749b7..1fc0139cb9694ddea41f57d95774c3b47e8530c5 100644 --- a/src/main/java/net/minecraft/server/JsonList.java +++ b/src/main/java/net/minecraft/server/JsonList.java @@ -12,6 +12,8 @@ import java.io.BufferedReader; import java.io.BufferedWriter; import java.io.File; import java.io.IOException; +import java.lang.reflect.ParameterizedType; // Paper +import java.lang.reflect.Type; // Paper import java.nio.charset.StandardCharsets; import java.util.Collection; import java.util.Iterator; @@ -26,7 +28,22 @@ public abstract class JsonList> { protected static final Logger LOGGER = LogManager.getLogger(); private static final Gson b = (new GsonBuilder()).setPrettyPrinting().create(); private final File c; - private final Map d = Maps.newHashMap(); + // Paper - replace HashMap is ConcurrentHashMap + private final Map d = Maps.newConcurrentMap(); private final Map getBackingMap() { return this.d; } // Paper - OBFHELPER + private boolean e = true; + private static final ParameterizedType f = new ParameterizedType() { + public Type[] getActualTypeArguments() { + return new Type[]{JsonListEntry.class}; + } + + public Type getRawType() { + return List.class; + } + + public Type getOwnerType() { + return null; + } + }; public JsonList(File file) { this.c = file; @@ -49,8 +66,13 @@ public abstract class JsonList> { @Nullable public V get(K k0) { - this.g(); - return (V) this.d.get(this.a(k0)); // CraftBukkit - fix decompile error + // Paper start + // this.g(); + // return (V) this.d.get(this.a(k0)); // CraftBukkit - fix decompile error + return (V) this.getBackingMap().computeIfPresent(this.getMappingKey(k0), (k, v) -> { + return v.hasExpired() ? null : v; + }); + // Paper end } public void remove(K k0) { @@ -79,9 +101,11 @@ public abstract class JsonList> { // CraftBukkit end public boolean isEmpty() { - return this.d.size() < 1; + // return this.d.size() < 1; // Paper + 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 } + protected final String getMappingKey(K k0) { return a(k0); } // Paper - OBFHELPER protected String a(K k0) { return k0.toString(); } @@ -90,8 +114,9 @@ public abstract class JsonList> { return this.d.containsKey(this.a(k0)); } + private void removeStaleEntries() { g(); } // Paper - OBFHELPER private void g() { - List list = Lists.newArrayList(); + /*List list = Lists.newArrayList(); Iterator iterator = this.d.values().iterator(); while (iterator.hasNext()) { @@ -108,8 +133,10 @@ public abstract class JsonList> { K k0 = (K) iterator.next(); // CraftBukkit - decompile error this.d.remove(this.a(k0)); - } + }*/ + this.getBackingMap().values().removeIf(JsonListEntry::hasExpired); + // Paper end } protected abstract JsonListEntry a(JsonObject jsonobject); @@ -119,6 +146,7 @@ public abstract class JsonList> { } public void save() throws IOException { + this.removeStaleEntries(); // Paper - remove expired values before saving JsonArray jsonarray = new JsonArray(); this.d.values().stream().map((jsonlistentry) -> { diff --git a/src/main/java/net/minecraft/server/PlayerList.java b/src/main/java/net/minecraft/server/PlayerList.java index 020cd10518328b81495e44b816446c96bfe1bdcc..304ef7279f649dd8c51a68084b839c3092e5872e 100644 --- a/src/main/java/net/minecraft/server/PlayerList.java +++ b/src/main/java/net/minecraft/server/PlayerList.java @@ -546,7 +546,7 @@ public abstract class PlayerList { } else if (!this.isWhitelisted(gameprofile, event)) { // Paper chatmessage = new ChatMessage("multiplayer.disconnect.not_whitelisted"); //event.disallow(PlayerLoginEvent.Result.KICK_WHITELIST, org.spigotmc.SpigotConfig.whitelistMessage); // Spigot // Paper - moved to isWhitelisted - } else if (getIPBans().isBanned(socketaddress) && !getIPBans().get(socketaddress).hasExpired()) { + } else if (getIPBans().isBanned(socketaddress) && getIPBans().get(socketaddress) != null && !getIPBans().get(socketaddress).hasExpired()) { // Paper - fix NPE with temp ip bans IpBanEntry ipbanentry = this.l.get(socketaddress); chatmessage = new ChatMessage("multiplayer.disconnect.banned_ip.reason", new Object[]{ipbanentry.getReason()});