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7fb12d787e
We were missing a synchronize on a get if cached method, however it appears that using a ConcurrentHashMap is a better solution so readers can avoid locking if they just want a cached value. Existing synchronization for writers remains untouched, the ConcurrentHashMap is just so readers can safely read without synchronization
110 lines
4.4 KiB
Diff
110 lines
4.4 KiB
Diff
From a29caf1df2a8c7f8a6201b61dd3487c7525829e5 Mon Sep 17 00:00:00 2001
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From: Aikar <aikar@aikar.co>
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Date: Mon, 16 May 2016 20:47:41 -0400
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Subject: [PATCH] Optimize UserCache / Thread Safe
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Because Techable keeps complaining about how this isn't thread safe,
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easier to do this than replace the entire thing.
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Additionally, move Saving of the User cache to be done async, incase
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the user never changed the default setting for Spigot's save on stop only.
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diff --git a/src/main/java/net/minecraft/server/MinecraftServer.java b/src/main/java/net/minecraft/server/MinecraftServer.java
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index d3d8fffeb0..f142ed9a3b 100644
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--- a/src/main/java/net/minecraft/server/MinecraftServer.java
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+++ b/src/main/java/net/minecraft/server/MinecraftServer.java
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@@ -739,7 +739,7 @@ public abstract class MinecraftServer extends IAsyncTaskHandlerReentrant<TickTas
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// Spigot start
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if (org.spigotmc.SpigotConfig.saveUserCacheOnStopOnly) {
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LOGGER.info("Saving usercache.json");
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- this.getUserCache().c();
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+ this.getUserCache().c(false); // Paper
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}
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// Spigot end
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}
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diff --git a/src/main/java/net/minecraft/server/UserCache.java b/src/main/java/net/minecraft/server/UserCache.java
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index 41be5bf64e..dc5c0afab4 100644
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--- a/src/main/java/net/minecraft/server/UserCache.java
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+++ b/src/main/java/net/minecraft/server/UserCache.java
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@@ -43,8 +43,8 @@ public class UserCache {
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public static final SimpleDateFormat a = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss Z");
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private static boolean c;
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- private final Map<String, UserCache.UserCacheEntry> d = Maps.newHashMap();
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- private final Map<UUID, UserCache.UserCacheEntry> e = Maps.newHashMap();
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+ private final Map<String, UserCache.UserCacheEntry> d = new java.util.concurrent.ConcurrentHashMap<>(); // Paper
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+ private final Map<UUID, UserCache.UserCacheEntry> e = new java.util.concurrent.ConcurrentHashMap<>(); // Paper
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private final Deque<GameProfile> f = new java.util.concurrent.LinkedBlockingDeque<GameProfile>(); // CraftBukkit
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private final GameProfileRepository g;
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protected final Gson b;
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@@ -108,7 +108,7 @@ public class UserCache {
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this.a(gameprofile, (Date) null);
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}
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- private void a(GameProfile gameprofile, Date date) {
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+ private synchronized void a(GameProfile gameprofile, Date date) { // Paper - synchronize
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UUID uuid = gameprofile.getId();
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if (date == null) {
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@@ -121,8 +121,9 @@ public class UserCache {
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UserCache.UserCacheEntry usercache_usercacheentry = new UserCache.UserCacheEntry(gameprofile, date);
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- if (this.e.containsKey(uuid)) {
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+ //if (this.e.containsKey(uuid)) { // Paper
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UserCache.UserCacheEntry usercache_usercacheentry1 = (UserCache.UserCacheEntry) this.e.get(uuid);
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+ if (usercache_usercacheentry1 != null) { // Paper
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this.d.remove(usercache_usercacheentry1.a().getName().toLowerCase(Locale.ROOT));
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this.f.remove(gameprofile);
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@@ -135,7 +136,7 @@ public class UserCache {
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}
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@Nullable
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- public GameProfile getProfile(String s) {
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+ public synchronized GameProfile getProfile(String s) { // Paper - synchronize
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String s1 = s.toLowerCase(Locale.ROOT);
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UserCache.UserCacheEntry usercache_usercacheentry = (UserCache.UserCacheEntry) this.d.get(s1);
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@@ -164,6 +165,7 @@ public class UserCache {
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return usercache_usercacheentry == null ? null : usercache_usercacheentry.a();
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}
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+ @Nullable public GameProfile getProfile(UUID uuid) { return a(uuid); } // Paper - OBFHELPER
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@Nullable
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public GameProfile a(UUID uuid) {
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UserCache.UserCacheEntry usercache_usercacheentry = (UserCache.UserCacheEntry) this.e.get(uuid);
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@@ -220,8 +222,15 @@ public class UserCache {
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}
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+ // Paper start
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public void c() {
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+ c(true);
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+ }
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+ public void c(boolean asyncSave) {
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+ // Paper end
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String s = this.b.toJson(this.a(org.spigotmc.SpigotConfig.userCacheCap));
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+ Runnable save = () -> {
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+
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BufferedWriter bufferedwriter = null;
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try {
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@@ -235,6 +244,14 @@ public class UserCache {
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} finally {
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IOUtils.closeQuietly(bufferedwriter);
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}
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+ // Paper start
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+ };
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+ if (asyncSave) {
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+ MCUtil.scheduleAsyncTask(save);
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+ } else {
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+ save.run();
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+ }
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+ // Paper end
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}
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--
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2.21.0
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