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PaperMC/patches/server/0800-Use-array-for-gamerule-storage.patch
Spottedleaf 8c5b837e05 Rework async chunk api implementation
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.
2024-11-18 23:00:59 -08:00

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2.5 KiB
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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Paul Sauve <paul@technove.co>
Date: Sun, 9 May 2021 16:49:49 -0500
Subject: [PATCH] Use array for gamerule storage
diff --git a/src/main/java/net/minecraft/world/level/GameRules.java b/src/main/java/net/minecraft/world/level/GameRules.java
index 09299e45552eb998fd02123c3921c0653f85083d..4ae47c2c5a6bcfbf932d000a80974463e2d3818d 100644
--- a/src/main/java/net/minecraft/world/level/GameRules.java
+++ b/src/main/java/net/minecraft/world/level/GameRules.java
@@ -129,6 +129,7 @@ public class GameRules {
}));
private final Map<GameRules.Key<?>, GameRules.Value<?>> rules;
private final FeatureFlagSet enabledFeatures;
+ private final GameRules.Value<?>[] gameruleArray; // Paper - Perf: Use array for gamerule storage
private static <T extends GameRules.Value<T>> GameRules.Key<T> register(String name, GameRules.Category category, GameRules.Type<T> type) {
GameRules.Key<T> gamerules_gamerulekey = new GameRules.Key<>(name, category);
@@ -161,10 +162,21 @@ public class GameRules {
private GameRules(Map<GameRules.Key<?>, GameRules.Value<?>> rules, FeatureFlagSet enabledFeatures) {
this.rules = rules;
this.enabledFeatures = enabledFeatures;
+
+ // Paper start - Perf: Use array for gamerule storage
+ int arraySize = GameRules.Key.lastGameRuleIndex + 1;
+ GameRules.Value<?>[] values = new GameRules.Value[arraySize];
+
+ for (Entry<GameRules.Key<?>, GameRules.Value<?>> entry : rules.entrySet()) {
+ values[entry.getKey().gameRuleIndex] = entry.getValue();
+ }
+
+ this.gameruleArray = values;
+ // Paper end - Perf: Use array for gamerule storage
}
public <T extends GameRules.Value<T>> T getRule(GameRules.Key<T> key) {
- T t0 = (T) this.rules.get(key); // CraftBukkit - decompile error
+ T t0 = key == null ? null : (T) this.gameruleArray[key.gameRuleIndex]; // Paper - Perf: Use array for gamerule storage
if (t0 == null) {
throw new IllegalArgumentException("Tried to access invalid game rule");
@@ -232,6 +244,10 @@ public class GameRules {
}
public static final class Key<T extends GameRules.Value<T>> {
+ // Paper start - Perf: Use array for gamerule storage
+ public static int lastGameRuleIndex = 0;
+ public final int gameRuleIndex = lastGameRuleIndex++;
+ // Paper end - Perf: Use array for gamerule storage
final String id;
private final GameRules.Category category;