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Optimize entity tracker passenger checks (#6361)

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When a ServerEntity instance is first constructed, it uses a pre-Java 9 empty collection,
but passengers use Guava ImmutableList. When comparing the two collections via Object#equals
we miss out on an opportunity to reduce the check to little more than a reference equality
check (which is very fast).
This commit is contained in:
Andrew Steinborn 2021-08-09 18:36:45 +00:00
parent 68db0c9853
commit 3a2986e746
1 changed files with 19 additions and 0 deletions
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patches/server/Optimize-entity-tracker-passenger-checks.patch Normal file
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@ -0,0 +1,19 @@
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Andrew Steinborn <git@steinborn.me>
Date: Sun, 8 Aug 2021 00:52:54 -0400
Subject: [PATCH] Optimize entity tracker passenger checks
diff --git a/src/main/java/net/minecraft/server/level/ServerEntity.java b/src/main/java/net/minecraft/server/level/ServerEntity.java
index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
--- a/src/main/java/net/minecraft/server/level/ServerEntity.java
+++ b/src/main/java/net/minecraft/server/level/ServerEntity.java
@@ -0,0 +0,0 @@ public class ServerEntity {
this.trackedPlayers = trackedPlayers;
// CraftBukkit end
this.ap = Vec3.ZERO;
- this.lastPassengers = Collections.emptyList();
+ this.lastPassengers = com.google.common.collect.ImmutableList.of(); // Paper - optimize passenger checks
this.level = worldserver;
this.broadcast = consumer;
this.entity = entity;