105 lines
4.5 KiB
Diff
105 lines
4.5 KiB
Diff
From 6b6ec7e713ac57a04dc7004e164eb3cd80d364ca Mon Sep 17 00:00:00 2001
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From: Aikar <aikar@aikar.co>
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Date: Tue, 8 Mar 2016 19:13:54 -0500
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Subject: [PATCH] Optimize Navigation Listener
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Mojang was abusing a WeakHashMap to do clean up. However this has some
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scary object life concerns as you could have a NavigationListener being
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ticked even after the entity it was bound to was removed from world.
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Switching this to an Array List gives superior iteration performance
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at a slight cost to removal performance.
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Additionally, change listener registration to be done upon world add
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instead of immediate up creation.
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This provides benefit of only registering and ticking REAL Navigation
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objects, and not invalid entities (cancelled entity spawns for example)
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Gives us a much leaner NavigationListener list.
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diff --git a/src/main/java/net/minecraft/server/NavigationAbstract.java b/src/main/java/net/minecraft/server/NavigationAbstract.java
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index 7d794b9..aa18f54 100644
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--- a/src/main/java/net/minecraft/server/NavigationAbstract.java
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+++ b/src/main/java/net/minecraft/server/NavigationAbstract.java
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@@ -32,7 +32,7 @@ public abstract class NavigationAbstract {
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this.b = world;
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this.g = entityinsentient.getAttributeInstance(GenericAttributes.FOLLOW_RANGE);
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this.s = this.a();
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- this.b.C().a(this);
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+ //this.b.C().a(this); // Paper - Optimized Nav Listener - registered on world add
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}
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protected abstract Pathfinder a();
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diff --git a/src/main/java/net/minecraft/server/NavigationListener.java b/src/main/java/net/minecraft/server/NavigationListener.java
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index 39a4032..3c277cb 100644
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--- a/src/main/java/net/minecraft/server/NavigationListener.java
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+++ b/src/main/java/net/minecraft/server/NavigationListener.java
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@@ -1,16 +1,19 @@
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package net.minecraft.server;
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+import java.util.ArrayList; // Paper
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+import java.util.List; // Paper
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import java.util.WeakHashMap;
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public class NavigationListener implements IWorldAccess {
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private static final Object a = new Object();
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- private final WeakHashMap<NavigationAbstract, Object> b = new WeakHashMap();
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+ private final List<NavigationAbstract> navigators = new ArrayList<>(); // Paper
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public NavigationListener() {}
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public void a(NavigationAbstract navigationabstract) {
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- this.b.put(navigationabstract, NavigationListener.a);
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+ //this.b.put(navigationabstract, NavigationListener.a); // Paper
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+ System.err.println("Unexpected NavigationListener add"); // Paper
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}
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public void a(World world, BlockPosition blockposition, IBlockData iblockdata, IBlockData iblockdata1, int i) {
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@@ -19,10 +22,15 @@ public class NavigationListener implements IWorldAccess {
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// NavigationAbstract[] anavigationabstract = (NavigationAbstract[]) this.b.keySet().toArray(new NavigationAbstract[0]);
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// NavigationAbstract[] anavigationabstract1 = anavigationabstract;
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// int j = anavigationabstract.length;
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+ // Spigot end
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- for (NavigationAbstract navigationabstract : this.b.keySet()) {
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- // NavigationAbstract navigationabstract = anavigationabstract1[k];
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- // Spigot end
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+ // Paper start
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+ // DO NOT USE AN ITERATOR! This must be a for (;;) to avoid CME.
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+ // This is perfectly safe, as additions are ok to be done in this iteration
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+ // And Removals are queued instead of immediate.
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+ for (int k = 0; k < this.navigators.size(); ++k) {
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+ NavigationAbstract navigationabstract = this.navigators.get(k);
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+ // Paper end
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if (navigationabstract != null && !navigationabstract.i()) {
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PathEntity pathentity = navigationabstract.k();
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@@ -57,9 +65,21 @@ public class NavigationListener implements IWorldAccess {
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public void a(int i, boolean flag, double d0, double d1, double d2, double d3, double d4, double d5, int... aint) {}
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- public void a(Entity entity) {}
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+ public void a(Entity entity) {
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+ // Paper start
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+ if (entity instanceof EntityInsentient) {
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+ this.navigators.add(((EntityInsentient) entity).navigation);
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+ }
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+ // Paper end
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+ }
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- public void b(Entity entity) {}
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+ public void b(Entity entity) {
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+ // Paper start
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+ if (entity instanceof EntityInsentient) {
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+ this.navigators.remove(((EntityInsentient) entity).navigation);
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+ }
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+ // Paper end
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+ }
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public void a(SoundEffect soundeffect, BlockPosition blockposition) {}
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--
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2.7.4
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