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Paper/patches/server/0067-Use-a-Shared-Random-for-Entities.patch

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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Aikar <aikar@aikar.co>
Date: Tue, 22 Mar 2016 00:33:47 -0400
Subject: [PATCH] Use a Shared Random for Entities
Reduces memory usage and provides ensures more randomness, Especially since a lot of garbage entity objects get created.
diff --git a/src/main/java/net/minecraft/world/entity/Entity.java b/src/main/java/net/minecraft/world/entity/Entity.java
index 0d8590368ed35bd95f3b8abcd34eb172ef8ae43b..9aa25ee1e4e3ad205e9e373bbf95d24bd305e078 100644
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--- a/src/main/java/net/minecraft/world/entity/Entity.java
+++ b/src/main/java/net/minecraft/world/entity/Entity.java
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@@ -153,6 +153,21 @@ public abstract class Entity implements Nameable, EntityAccess, CommandSource, n
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return tag.contains("Bukkit.updateLevel") && tag.getInt("Bukkit.updateLevel") >= level;
}
+ // Paper start
+ public static Random SHARED_RANDOM = new Random() {
+ private boolean locked = false;
+ @Override
+ public synchronized void setSeed(long seed) {
+ if (locked) {
+ LogManager.getLogger().error("Ignoring setSeed on Entity.SHARED_RANDOM", new Throwable());
+ } else {
+ super.setSeed(seed);
+ locked = true;
+ }
+ }
+ };
+ // Paper end
+
private CraftEntity bukkitEntity;
public CraftEntity getBukkitEntity() {
@@ -324,7 +339,7 @@ public abstract class Entity implements Nameable, EntityAccess, CommandSource, n
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this.bb = Entity.INITIAL_AABB;
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this.stuckSpeedMultiplier = Vec3.ZERO;
this.nextStep = 1.0F;
- this.random = new Random();
+ this.random = SHARED_RANDOM; // Paper
this.remainingFireTicks = -this.getFireImmuneTicks();
this.fluidHeight = new Object2DoubleArrayMap(2);
this.firstTick = true;
diff --git a/src/main/java/net/minecraft/world/entity/animal/Squid.java b/src/main/java/net/minecraft/world/entity/animal/Squid.java
index a24c05706ac8f088f1342ca947c5f1ff0fe80366..3093fc37c47bec1a6e884553809277fff1053d8e 100644
--- a/src/main/java/net/minecraft/world/entity/animal/Squid.java
+++ b/src/main/java/net/minecraft/world/entity/animal/Squid.java
@@ -50,7 +50,7 @@ public class Squid extends WaterAnimal {
public Squid(EntityType<? extends Squid> type, Level world) {
super(type, world);
- this.random.setSeed((long) this.getId());
+ //this.random.setSeed((long) this.getId()); // Paper - we set the random to shared, do not clobber the seed
this.tentacleSpeed = 1.0F / (this.random.nextFloat() + 1.0F) * 0.2F;
}