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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).
20 lines
992 B
Diff
20 lines
992 B
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Andrew Steinborn <git@steinborn.me>
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Date: Sun, 8 Aug 2021 00:52:54 -0400
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Subject: [PATCH] Optimize entity tracker passenger checks
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diff --git a/src/main/java/net/minecraft/server/level/ServerEntity.java b/src/main/java/net/minecraft/server/level/ServerEntity.java
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index 2f3e69ad809199ffc2661d524bb627ec8dbc2e80..e5cae2fb67541785072324e5434820ee4b169556 100644
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--- a/src/main/java/net/minecraft/server/level/ServerEntity.java
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+++ b/src/main/java/net/minecraft/server/level/ServerEntity.java
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@@ -74,7 +74,7 @@ public class ServerEntity {
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this.trackedPlayers = trackedPlayers;
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// CraftBukkit end
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this.ap = Vec3.ZERO;
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- this.lastPassengers = Collections.emptyList();
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+ this.lastPassengers = com.google.common.collect.ImmutableList.of(); // Paper - optimize passenger checks
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this.level = worldserver;
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this.broadcast = consumer;
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this.entity = entity;
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