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8c5b837e05
Firstly, the old methods all routed to the CompletableFuture method. However, the CF method could not guarantee that if the caller was off-main that the future would be "completed" on-main. Since the callback methods used the CF one, this meant that the callback methods did not guarantee that the callbacks were to be called on the main thread. Now, all methods route to getChunkAtAsync(x, z, gen, urgent, cb) so that the methods with the callback are guaranteed to invoke the callback on the main thread. The CF behavior remains unchanged; it may still appear to complete on main if invoked off-main. Secondly, remove the scheduleOnMain invocation in the async chunk completion. This unnecessarily delays the callback by 1 tick. Thirdly, add getChunksAtAsync(minX, minZ, maxX, maxZ, ...) which will load chunks within an area. This method is provided as a helper as keeping all chunks loaded within an area can be complicated to implement for plugins (due to the lacking ticket API), and is already implemented internally anyways. Fourthly, remove the ticket addition that occured with getChunkAt and getChunkAtAsync. The ticket addition may delay the unloading of the chunk unnecessarily. It also fixes a very rare timing bug where the future/callback would be completed after the chunk unloads.
127 lines
6.5 KiB
Diff
127 lines
6.5 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Spottedleaf <Spottedleaf@users.noreply.github.com>
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Date: Sat, 11 Jul 2020 05:09:28 -0700
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Subject: [PATCH] Fix GameProfileCache concurrency
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Separate lookup and state access locks prevent lookups
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from stalling simple state access/write calls
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diff --git a/src/main/java/net/minecraft/server/players/GameProfileCache.java b/src/main/java/net/minecraft/server/players/GameProfileCache.java
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index 774d81c702edb76a2f6184d4dc53687de6734a79..34b4166adfae8ff7d1eb73d56a72931b005330a7 100644
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--- a/src/main/java/net/minecraft/server/players/GameProfileCache.java
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+++ b/src/main/java/net/minecraft/server/players/GameProfileCache.java
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@@ -60,6 +60,11 @@ public class GameProfileCache {
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@Nullable
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private Executor executor;
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+ // Paper start - Fix GameProfileCache concurrency
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+ protected final java.util.concurrent.locks.ReentrantLock stateLock = new java.util.concurrent.locks.ReentrantLock();
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+ protected final java.util.concurrent.locks.ReentrantLock lookupLock = new java.util.concurrent.locks.ReentrantLock();
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+ // Paper end - Fix GameProfileCache concurrency
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+
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public GameProfileCache(GameProfileRepository profileRepository, File cacheFile) {
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this.profileRepository = profileRepository;
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this.file = cacheFile;
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@@ -67,11 +72,13 @@ public class GameProfileCache {
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}
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private void safeAdd(GameProfileCache.GameProfileInfo entry) {
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+ try { this.stateLock.lock(); // Paper - Fix GameProfileCache concurrency
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GameProfile gameprofile = entry.getProfile();
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entry.setLastAccess(this.getNextOperation());
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this.profilesByName.put(gameprofile.getName().toLowerCase(Locale.ROOT), entry);
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this.profilesByUUID.put(gameprofile.getId(), entry);
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+ } finally { this.stateLock.unlock(); } // Paper - Fix GameProfileCache concurrency
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}
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private static Optional<GameProfile> lookupGameProfile(GameProfileRepository repository, String name) {
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@@ -128,17 +135,20 @@ public class GameProfileCache {
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// Paper start
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public @Nullable GameProfile getProfileIfCached(String name) {
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+ try { this.stateLock.lock(); // Paper - Fix GameProfileCache concurrency
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GameProfileCache.GameProfileInfo entry = this.profilesByName.get(name.toLowerCase(Locale.ROOT));
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if (entry == null) {
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return null;
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}
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entry.setLastAccess(this.getNextOperation());
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return entry.getProfile();
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+ } finally { this.stateLock.unlock(); } // Paper - Fix GameProfileCache concurrency
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}
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// Paper end
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public Optional<GameProfile> get(String name) {
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String s1 = name.toLowerCase(Locale.ROOT);
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+ boolean stateLocked = true; try { this.stateLock.lock(); // Paper - Fix GameProfileCache concurrency
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GameProfileCache.GameProfileInfo usercache_usercacheentry = (GameProfileCache.GameProfileInfo) this.profilesByName.get(s1);
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boolean flag = false;
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@@ -154,8 +164,12 @@ public class GameProfileCache {
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if (usercache_usercacheentry != null) {
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usercache_usercacheentry.setLastAccess(this.getNextOperation());
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optional = Optional.of(usercache_usercacheentry.getProfile());
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+ stateLocked = false; this.stateLock.unlock(); // Paper - Fix GameProfileCache concurrency
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} else {
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+ stateLocked = false; this.stateLock.unlock(); // Paper - Fix GameProfileCache concurrency
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+ try { this.lookupLock.lock(); // Paper - Fix GameProfileCache concurrency
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optional = GameProfileCache.lookupGameProfile(this.profileRepository, name); // CraftBukkit - use correct case for offline players
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+ } finally { this.lookupLock.unlock(); } // Paper - Fix GameProfileCache concurrency
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if (optional.isPresent()) {
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this.add((GameProfile) optional.get());
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flag = false;
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@@ -167,6 +181,7 @@ public class GameProfileCache {
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}
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return optional;
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+ } finally { if (stateLocked) { this.stateLock.unlock(); } } // Paper - Fix GameProfileCache concurrency
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}
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public CompletableFuture<Optional<GameProfile>> getAsync(String username) {
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@@ -191,6 +206,7 @@ public class GameProfileCache {
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}
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public Optional<GameProfile> get(UUID uuid) {
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+ try { this.stateLock.lock(); // Paper - Fix GameProfileCache concurrency
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GameProfileCache.GameProfileInfo usercache_usercacheentry = (GameProfileCache.GameProfileInfo) this.profilesByUUID.get(uuid);
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if (usercache_usercacheentry == null) {
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@@ -199,6 +215,7 @@ public class GameProfileCache {
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usercache_usercacheentry.setLastAccess(this.getNextOperation());
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return Optional.of(usercache_usercacheentry.getProfile());
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}
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+ } finally { this.stateLock.unlock(); } // Paper - Fix GameProfileCache concurrency
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}
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public void setExecutor(Executor executor) {
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@@ -279,7 +296,7 @@ public class GameProfileCache {
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JsonArray jsonarray = new JsonArray();
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DateFormat dateformat = GameProfileCache.createDateFormat();
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- this.getTopMRUProfiles(org.spigotmc.SpigotConfig.userCacheCap).forEach((usercache_usercacheentry) -> { // Spigot
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+ this.listTopMRUProfiles(org.spigotmc.SpigotConfig.userCacheCap).forEach((usercache_usercacheentry) -> { // Spigot // Paper - Fix GameProfileCache concurrency
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jsonarray.add(GameProfileCache.writeGameProfile(usercache_usercacheentry, dateformat));
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});
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String s = this.gson.toJson(jsonarray);
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@@ -320,8 +337,19 @@ public class GameProfileCache {
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}
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private Stream<GameProfileCache.GameProfileInfo> getTopMRUProfiles(int limit) {
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- return ImmutableList.copyOf(this.profilesByUUID.values()).stream().sorted(Comparator.comparing(GameProfileCache.GameProfileInfo::getLastAccess).reversed()).limit((long) limit);
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+ // Paper start - Fix GameProfileCache concurrency
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+ return this.listTopMRUProfiles(limit).stream();
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+ }
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+
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+ private List<GameProfileCache.GameProfileInfo> listTopMRUProfiles(int limit) {
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+ try {
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+ this.stateLock.lock();
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+ return this.profilesByUUID.values().stream().sorted(Comparator.comparing(GameProfileCache.GameProfileInfo::getLastAccess).reversed()).limit(limit).toList();
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+ } finally {
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+ this.stateLock.unlock();
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+ }
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}
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+ // Paper end - Fix GameProfileCache concurrency
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private static JsonElement writeGameProfile(GameProfileCache.GameProfileInfo entry, DateFormat dateFormat) {
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JsonObject jsonobject = new JsonObject();
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