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Replace ThreadLocal with ConcurrentHashMap in CommandSourceStack (#6325)

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This object is created so often that it likely creates problems with the
ThreadLocalMap because the weak references can't be cleaned up fast
enough. This has manifest as lag seemingly caused by WorldEdit:
https://github.com/EngineHub/WorldEdit/issues/1668
This commit is contained in:
Octavia Togami 2021-08-21 20:45:40 -07:00
parent 889718222e
commit 1291aa829a
1 changed files with 15 additions and 4 deletions
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19
patches/server/Thread-Safe-Vanilla-Command-permission-checking.patch
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@ -17,11 +17,11 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
if (source instanceof CommandSourceStack) {
try {
- ((CommandSourceStack) source).currentCommand = this;
+ ((CommandSourceStack) source).currentCommand.set(this); // Paper
+ ((CommandSourceStack) source).currentCommand.put(Thread.currentThread(), this); // Paper
return this.requirement.test(source);
} finally {
- ((CommandSourceStack) source).currentCommand = null;
+ ((CommandSourceStack) source).currentCommand.set(null); // Paper
+ ((CommandSourceStack) source).currentCommand.remove(Thread.currentThread()); // Paper
}
}
// CraftBukkit end
@ -29,12 +29,23 @@ diff --git a/src/main/java/net/minecraft/commands/CommandSourceStack.java b/src/
index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
--- a/src/main/java/net/minecraft/commands/CommandSourceStack.java
+++ b/src/main/java/net/minecraft/commands/CommandSourceStack.java
@@ -0,0 +0,0 @@ import com.mojang.brigadier.suggestion.Suggestions;
import com.mojang.brigadier.suggestion.SuggestionsBuilder;
import java.util.Collection;
import java.util.Iterator;
+import java.util.Map;
import java.util.Set;
import java.util.concurrent.CompletableFuture;
+import java.util.concurrent.ConcurrentHashMap;
import java.util.function.BinaryOperator;
import java.util.stream.Stream;
import javax.annotation.Nullable;
@@ -0,0 +0,0 @@ public class CommandSourceStack implements SharedSuggestionProvider, com.destroy
private final ResultConsumer<CommandSourceStack> consumer;
private final EntityAnchorArgument.Anchor anchor;
private final Vec2 rotation;
- public volatile CommandNode currentCommand; // CraftBukkit
+ public ThreadLocal<CommandNode> currentCommand = new ThreadLocal<>(); // CraftBukkit // Paper
+ public Map<Thread, CommandNode> currentCommand = new ConcurrentHashMap<>(); // CraftBukkit // Paper
public CommandSourceStack(CommandSource output, Vec3 pos, Vec2 rot, ServerLevel world, int level, String name, Component displayName, MinecraftServer server, @Nullable Entity entity) {
this(output, pos, rot, world, level, name, displayName, server, entity, false, (commandcontext, flag, j) -> {
@ -44,7 +55,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
// CraftBukkit start
- CommandNode currentCommand = this.currentCommand;
+ // Paper start - fix concurrency issue
+ CommandNode currentCommand = this.currentCommand.get();
+ CommandNode currentCommand = this.currentCommand.get(Thread.currentThread());
if (currentCommand != null) {
return this.hasPermission(level, org.bukkit.craftbukkit.command.VanillaCommandWrapper.getPermission(currentCommand));
+ // Paper end