Paper/Spigot-Server-Patches/0070-Use-a-Shared-Random-for-Entities.patch

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From 21c88e53a02069dab8e9e1606d4c6d62eeac08ff 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/server/Entity.java b/src/main/java/net/minecraft/server/Entity.java
index d95d9c7203..4f81321b94 100644
--- a/src/main/java/net/minecraft/server/Entity.java
+++ b/src/main/java/net/minecraft/server/Entity.java
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@@ -58,6 +58,21 @@ public abstract class Entity implements INamableTileEntity, ICommandListener, Ke
return tag.hasKey("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
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+
private CraftEntity bukkitEntity;
public CraftEntity getBukkitEntity() {
@@ -192,7 +207,7 @@ public abstract class Entity implements INamableTileEntity, ICommandListener, Ke
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this.y = Vec3D.a;
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this.av = 1.0F;
this.aw = 1.0F;
- this.random = new Random();
+ this.random = SHARED_RANDOM; // Paper
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this.fireTicks = -this.getMaxFireTicks();
this.justCreated = true;
this.uniqueID = MathHelper.a(this.random);
--
2.25.0