From 5bb81d3a9a3dcc78fc00d4c1b487d6b827df3578 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 39ca7d5870..865dfa2b05 100644 --- a/src/main/java/net/minecraft/server/Entity.java +++ b/src/main/java/net/minecraft/server/Entity.java @@ -54,6 +54,20 @@ 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; } @@ -189,7 +203,7 @@ public abstract class Entity implements INamableTileEntity, ICommandListener, Ke this.B = Vec3D.a; this.av = 1.0F; this.aw = 1.0F; - this.random = new Random(); + this.random = SHARED_RANDOM; // Paper this.fireTicks = -this.getMaxFireTicks(); this.justCreated = true; this.uniqueID = MathHelper.a(this.random); -- 2.22.0