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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 b7df4d8eb3ccb9e8dc85898352f41c5c20abcb34..6cbb797cb0de4b26d8ddd7f0bf567f49bd36f9c0 100644
--- a/src/main/java/net/minecraft/world/entity/Entity.java
+++ b/src/main/java/net/minecraft/world/entity/Entity.java
@@ -143,6 +143,21 @@ public abstract class Entity implements INamableTileEntity, ICommandListener, ne
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
+
private CraftEntity bukkitEntity;
public CraftEntity getBukkitEntity() {
@@ -272,7 +287,7 @@ public abstract class Entity implements INamableTileEntity, ICommandListener, ne
this.x = Vec3D.ORIGIN;
this.am = 1.0F;
this.an = 1.0F;
- this.random = new Random();
+ this.random = SHARED_RANDOM; // Paper
this.fireTicks = -this.getMaxFireTicks();
this.M = new Object2DoubleArrayMap(2);
this.justCreated = true;
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