PaperMC/patches/server/0823-Optimize-player-lookups-for-beacons.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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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Spottedleaf <Spottedleaf@users.noreply.github.com>
Date: Thu, 6 Jul 2023 20:17:37 -0700
Subject: [PATCH] Optimize player lookups for beacons
For larger ranges, it's better to iterate over the player list
than the entity slices.
diff --git a/src/main/java/net/minecraft/world/level/block/entity/BeaconBlockEntity.java b/src/main/java/net/minecraft/world/level/block/entity/BeaconBlockEntity.java
index 2a7d896dd9a02acf6e3596e2e2e7ed50f4b88377..0e0d178f2793ab014358f534c8dc53218b89f083 100644
--- a/src/main/java/net/minecraft/world/level/block/entity/BeaconBlockEntity.java
+++ b/src/main/java/net/minecraft/world/level/block/entity/BeaconBlockEntity.java
@@ -333,7 +333,22 @@ public class BeaconBlockEntity extends BlockEntity implements MenuProvider, Name
double d0 = blockEntity != null ? blockEntity.getEffectRange() : (i * 10 + 10); // Paper - Custom beacon ranges
AABB axisalignedbb = (new AABB(blockposition)).inflate(d0).expandTowards(0.0D, (double) world.getHeight(), 0.0D);
- List<Player> list = world.getEntitiesOfClass(Player.class, axisalignedbb);
+ // Paper start - Perf: optimize player lookup for beacons
+ List<Player> list;
+ if (d0 <= 128.0) {
+ list = world.getEntitiesOfClass(Player.class, axisalignedbb);
+ } else {
+ list = new java.util.ArrayList<>();
+ for (Player player : world.players()) {
+ if (player.isSpectator()) {
+ continue;
+ }
+ if (player.getBoundingBox().intersects(axisalignedbb)) {
+ list.add(player);
+ }
+ }
+ }
+ // Paper end - Perf: optimize player lookup for beacons
return list;
}