From 0000000000000000000000000000000000000000 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/world/entity/Entity.java b/src/main/java/net/minecraft/world/entity/Entity.java index 78fd9e84e24b163b4918ba0580abca18806f4988..8e746391d6e3393a19e0f0cb3b28b6722df55510 100644 --- a/src/main/java/net/minecraft/world/entity/Entity.java +++ b/src/main/java/net/minecraft/world/entity/Entity.java @@ -155,6 +155,21 @@ public abstract class Entity implements Nameable, EntityAccess, CommandSource, i return tag.contains("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) { + LOGGER.error("Ignoring setSeed on Entity.SHARED_RANDOM", new Throwable()); + } else { + super.setSeed(seed); + locked = true; + } + } + }; + // Paper end + private CraftEntity bukkitEntity; public CraftEntity getBukkitEntity() { @@ -342,7 +357,7 @@ public abstract class Entity implements Nameable, EntityAccess, CommandSource, i this.bb = Entity.INITIAL_AABB; this.stuckSpeedMultiplier = Vec3.ZERO; this.nextStep = 1.0F; - this.random = new Random(); + this.random = SHARED_RANDOM; // Paper this.remainingFireTicks = -this.getFireImmuneTicks(); this.fluidHeight = new Object2DoubleArrayMap(2); this.fluidOnEyes = new HashSet(); diff --git a/src/main/java/net/minecraft/world/entity/animal/Squid.java b/src/main/java/net/minecraft/world/entity/animal/Squid.java index 8e63ab510e4c2e458da726ca67be4d3b5274e7b7..a51424d29ac353cf1bec4d1484db0acb63bebba5 100644 --- a/src/main/java/net/minecraft/world/entity/animal/Squid.java +++ b/src/main/java/net/minecraft/world/entity/animal/Squid.java @@ -46,7 +46,7 @@ public class Squid extends WaterAnimal { public Squid(EntityType type, Level world) { super(type, world); - this.random.setSeed((long) this.getId()); + //this.random.setSeed((long) this.getId()); // Paper - we set the random to shared, do not clobber the seed this.tentacleSpeed = 1.0F / (this.random.nextFloat() + 1.0F) * 0.2F; }