From 8eff43ace31acf510f77d2fe38e77627e29c1d08 Mon Sep 17 00:00:00 2001 From: Aikar 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 dfb7d544f..ab46ae8c3 100644 --- a/src/main/java/net/minecraft/server/Entity.java +++ b/src/main/java/net/minecraft/server/Entity.java @@ -49,6 +49,20 @@ 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; } @@ -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 this.fireTicks = -this.getMaxFireTicks(); this.justCreated = true; this.uniqueID = MathHelper.a(this.random); -- 2.20.1