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 diff --git a/src/main/java/net/minecraft/server/players/PlayerList.java b/src/main/java/net/minecraft/server/players/PlayerList.java index 3273c3f06c142d4e3c947ca846459f4a8e5eefd8..940896725c32981ddd2d5a23d72a87ba3e5e0fee 100644 --- a/src/main/java/net/minecraft/server/players/PlayerList.java +++ b/src/main/java/net/minecraft/server/players/PlayerList.java @@ -634,7 +634,7 @@ public abstract class PlayerList { } else if (!this.isWhiteListed(gameprofile, event)) { // Paper - ProfileWhitelistVerifyEvent //ichatmutablecomponent = Component.translatable("multiplayer.disconnect.not_whitelisted"); // Paper //event.disallow(PlayerLoginEvent.Result.KICK_WHITELIST, net.kyori.adventure.text.serializer.legacy.LegacyComponentSerializer.legacySection().deserialize(org.spigotmc.SpigotConfig.whitelistMessage)); // Spigot // Paper - Adventure - moved to isWhitelisted - } else if (this.getIpBans().isBanned(socketaddress) && !this.getIpBans().get(socketaddress).hasExpired()) { + } else if (this.getIpBans().isBanned(socketaddress) && getIpBans().get(socketaddress) != null && !this.getIpBans().get(socketaddress).hasExpired()) { // Paper - fix NPE with temp ip bans IpBanListEntry ipbanentry = this.ipBans.get(socketaddress); ichatmutablecomponent = Component.translatable("multiplayer.disconnect.banned_ip.reason", ipbanentry.getReason()); diff --git a/src/main/java/net/minecraft/server/players/StoredUserList.java b/src/main/java/net/minecraft/server/players/StoredUserList.java index 7e81907bfdca225413e8191e37969990e6f4cf2c..c038da20b76c0b7b1c18471b20be01e849d29f3a 100644 --- a/src/main/java/net/minecraft/server/players/StoredUserList.java +++ b/src/main/java/net/minecraft/server/players/StoredUserList.java @@ -30,7 +30,7 @@ public abstract class StoredUserList> { private static final Logger LOGGER = LogUtils.getLogger(); private static final Gson GSON = (new GsonBuilder()).setPrettyPrinting().create(); private final File file; - private final Map map = Maps.newHashMap(); + private final Map map = Maps.newConcurrentMap(); // Paper - Use ConcurrentHashMap in JsonList public StoredUserList(File file) { this.file = file; @@ -53,8 +53,11 @@ public abstract class StoredUserList> { @Nullable public V get(K key) { - this.removeExpired(); - return (V) this.map.get(this.getKeyForUser(key)); // CraftBukkit - fix decompile error + // Paper start - Use ConcurrentHashMap in JsonList + return (V) this.map.computeIfPresent(this.getKeyForUser(key), (k, v) -> { + return v.hasExpired() ? null : v; + }); + // Paper end - Use ConcurrentHashMap in JsonList } public void remove(K key) { @@ -77,7 +80,7 @@ public abstract class StoredUserList> { } public boolean isEmpty() { - return this.map.size() < 1; + return this.map.isEmpty(); // Paper - Use ConcurrentHashMap in JsonList } protected String getKeyForUser(K profile) { @@ -90,25 +93,7 @@ public abstract class StoredUserList> { } private void removeExpired() { - List list = Lists.newArrayList(); - Iterator iterator = this.map.values().iterator(); - - while (iterator.hasNext()) { - V v0 = (V) iterator.next(); // CraftBukkit - decompile error - - if (v0.hasExpired()) { - list.add(v0.getUser()); - } - } - - iterator = list.iterator(); - - while (iterator.hasNext()) { - K k0 = (K) iterator.next(); // CraftBukkit - decompile error - - this.map.remove(this.getKeyForUser(k0)); - } - + this.map.values().removeIf(StoredUserEntry::hasExpired); // Paper - Use ConcurrentHashMap in JsonList } protected abstract StoredUserEntry createEntry(JsonObject json); @@ -118,6 +103,7 @@ public abstract class StoredUserList> { } public void save() throws IOException { + this.removeExpired(); // Paper - remove expired values before saving JsonArray jsonarray = new JsonArray(); Stream stream = this.map.values().stream().map((jsonlistentry) -> { // CraftBukkit - decompile error JsonObject jsonobject = new JsonObject();