PaperMC/Spigot-Server-Patches/0536-Fix-AdvancementDataPlayer-leak-due-from-quitting-ear.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Spottedleaf <spottedleaf@spottedleaf.dev>
Date: Mon, 13 Jul 2020 06:22:54 -0700
Subject: [PATCH] Fix AdvancementDataPlayer leak due from quitting early in
 login

Move the criterion storage to the AdvancementDataPlayer object
itself, so the criterion object stores no references - and thus
needs no cleanup.

diff --git a/src/main/java/net/minecraft/advancements/critereon/CriterionTriggerAbstract.java b/src/main/java/net/minecraft/advancements/critereon/CriterionTriggerAbstract.java
index c2ee816af000f0c94782d704e6372cd93fd34bb3..c6388223daa26b200dc16cd562bcef19a5a59c8f 100644
--- a/src/main/java/net/minecraft/advancements/critereon/CriterionTriggerAbstract.java
+++ b/src/main/java/net/minecraft/advancements/critereon/CriterionTriggerAbstract.java
@@ -16,25 +16,25 @@ import net.minecraft.world.level.storage.loot.LootTableInfo;
 
 public abstract class CriterionTriggerAbstract<T extends CriterionInstanceAbstract> implements CriterionTrigger<T> {
 
-    private final Map<AdvancementDataPlayer, Set<CriterionTrigger.a<T>>> a = Maps.newIdentityHashMap();
+    //private final Map<AdvancementDataPlayer, Set<CriterionTrigger.a<T>>> a = Maps.newIdentityHashMap(); // Paper - moved into AdvancementDataPlayer to fix memory leak
 
     public CriterionTriggerAbstract() {}
 
     @Override
     public final void a(AdvancementDataPlayer advancementdataplayer, CriterionTrigger.a<T> criteriontrigger_a) {
-        ((Set) this.a.computeIfAbsent(advancementdataplayer, (advancementdataplayer1) -> {
+        (advancementdataplayer.criterionData.computeIfAbsent(this, (advancementdataplayer1) -> { // Paper - fix AdvancementDataPlayer leak
             return Sets.newHashSet();
         })).add(criteriontrigger_a);
     }
 
     @Override
     public final void b(AdvancementDataPlayer advancementdataplayer, CriterionTrigger.a<T> criteriontrigger_a) {
-        Set<CriterionTrigger.a<T>> set = (Set) this.a.get(advancementdataplayer);
+        Set<CriterionTrigger.a<T>> set = (Set) advancementdataplayer.criterionData.get(this); // Paper - fix AdvancementDataPlayer leak
 
         if (set != null) {
             set.remove(criteriontrigger_a);
             if (set.isEmpty()) {
-                this.a.remove(advancementdataplayer);
+                advancementdataplayer.criterionData.remove(this); // Paper - fix AdvancementDataPlayer leak
             }
         }
 
@@ -42,7 +42,7 @@ public abstract class CriterionTriggerAbstract<T extends CriterionInstanceAbstra
 
     @Override
     public final void a(AdvancementDataPlayer advancementdataplayer) {
-        this.a.remove(advancementdataplayer);
+        advancementdataplayer.criterionData.remove(this); // Paper - fix AdvancementDataPlayer leak
     }
 
     protected abstract T b(JsonObject jsonobject, CriterionConditionEntity.b criterionconditionentity_b, LootDeserializationContext lootdeserializationcontext);
@@ -56,7 +56,7 @@ public abstract class CriterionTriggerAbstract<T extends CriterionInstanceAbstra
 
     protected void a(EntityPlayer entityplayer, Predicate<T> predicate) {
         AdvancementDataPlayer advancementdataplayer = entityplayer.getAdvancementData();
-        Set<CriterionTrigger.a<T>> set = (Set) this.a.get(advancementdataplayer);
+        Set<CriterionTrigger.a<T>> set = (Set) advancementdataplayer.criterionData.get(this); // Paper - fix AdvancementDataPlayer leak
 
         if (set != null && !set.isEmpty()) {
             LootTableInfo loottableinfo = CriterionConditionEntity.b(entityplayer, entityplayer);
@@ -67,7 +67,7 @@ public abstract class CriterionTriggerAbstract<T extends CriterionInstanceAbstra
 
             while (iterator.hasNext()) {
                 criteriontrigger_a = (CriterionTrigger.a) iterator.next();
-                T t0 = (CriterionInstanceAbstract) criteriontrigger_a.a();
+                T t0 = (T) criteriontrigger_a.a(); // Paper - decompile fix
 
                 if (t0.b().a(loottableinfo) && predicate.test(t0)) {
                     if (list == null) {
diff --git a/src/main/java/net/minecraft/server/AdvancementDataPlayer.java b/src/main/java/net/minecraft/server/AdvancementDataPlayer.java
index e1d3f7e63c731f9376900a86abe17282e9b55ded..8e760445885f6ab92f60db0ee2a02d098b5e5f03 100644
--- a/src/main/java/net/minecraft/server/AdvancementDataPlayer.java
+++ b/src/main/java/net/minecraft/server/AdvancementDataPlayer.java
@@ -39,6 +39,7 @@ import net.minecraft.advancements.CriterionInstance;
 import net.minecraft.advancements.CriterionProgress;
 import net.minecraft.advancements.CriterionTrigger;
 import net.minecraft.advancements.CriterionTriggers;
+import net.minecraft.advancements.critereon.CriterionTriggerAbstract;
 import net.minecraft.network.chat.ChatMessage;
 import net.minecraft.network.chat.ChatMessageType;
 import net.minecraft.network.protocol.game.PacketPlayOutAdvancements;
@@ -69,6 +70,10 @@ public class AdvancementDataPlayer {
     private Advancement l;
     private boolean m = true;
 
+    // Paper start - fix advancement data player leakage
+    public final Map<CriterionTriggerAbstract, Set<CriterionTrigger.a>> criterionData = Maps.newIdentityHashMap();
+    // Paper end - fix advancement data player leakage
+
     public AdvancementDataPlayer(DataFixer datafixer, PlayerList playerlist, AdvancementDataWorld advancementdataworld, File file, EntityPlayer entityplayer) {
         this.d = datafixer;
         this.e = playerlist;