Paper/Spigot-Server-Patches/0078-Use-a-Shared-Random-for-Entities.patch

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2018-07-21 22:43:00 +02:00
From ce7ffaa9f437f871b1c1b87d5f22b482e25e9edc 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
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index e16579116..56aa89b45 100644
--- a/src/main/java/net/minecraft/server/Entity.java
+++ b/src/main/java/net/minecraft/server/Entity.java
@@ -50,6 +50,20 @@ public abstract class Entity implements INamableTileEntity, ICommandListener, Ke
// CraftBukkit start
private static final int CURRENT_LEVEL = 2;
+ // 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
static boolean isLevelAtLeast(NBTTagCompound tag, int level) {
return tag.hasKey("Bukkit.updateLevel") && tag.getInt("Bukkit.updateLevel") >= level;
}
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@@ -182,7 +196,7 @@ public abstract class Entity implements INamableTileEntity, ICommandListener, Ke
this.length = 1.8F;
this.aA = 1.0F;
this.aB = 1.0F;
- this.random = new Random();
+ this.random = SHARED_RANDOM; // Paper
2016-11-17 03:23:38 +01:00
this.fireTicks = -this.getMaxFireTicks();
this.justCreated = true;
this.uniqueID = MathHelper.a(this.random);
--
2.18.0