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/SimpleCriterionTrigger.java b/src/main/java/net/minecraft/advancements/critereon/SimpleCriterionTrigger.java
index 31650e41b37e322d2e8a4d4a3deec95851e72675..a645c79af856d2484a4ce7aa2885a32358b9a480 100644
--- a/src/main/java/net/minecraft/advancements/critereon/SimpleCriterionTrigger.java
+++ b/src/main/java/net/minecraft/advancements/critereon/SimpleCriterionTrigger.java
@@ -16,25 +16,25 @@ import net.minecraft.world.level.storage.loot.LootContext;
 
 public abstract class SimpleCriterionTrigger<T extends AbstractCriterionTriggerInstance> implements CriterionTrigger<T> {
 
-    private final Map<PlayerAdvancements, Set<CriterionTrigger.Listener<T>>> a = Maps.newIdentityHashMap();
+    //private final Map<AdvancementDataPlayer, Set<CriterionTrigger.a<T>>> a = Maps.newIdentityHashMap(); // Paper - moved into AdvancementDataPlayer to fix memory leak
 
     public SimpleCriterionTrigger() {}
 
     @Override
     public final void a(PlayerAdvancements advancementdataplayer, CriterionTrigger.Listener<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(PlayerAdvancements advancementdataplayer, CriterionTrigger.Listener<T> criteriontrigger_a) {
-        Set<CriterionTrigger.Listener<T>> set = (Set) this.a.get(advancementdataplayer);
+        Set<CriterionTrigger.Listener<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 SimpleCriterionTrigger<T extends AbstractCriterionTriggerI
 
     @Override
     public final void removePlayerListeners(PlayerAdvancements tracker) {
-        this.a.remove(tracker);
+        advancementdataplayer.criterionData.remove(this); // Paper - fix AdvancementDataPlayer leak
     }
 
     protected abstract T createInstance(JsonObject obj, EntityPredicate.Composite playerPredicate, DeserializationContext predicateDeserializer);
@@ -56,7 +56,7 @@ public abstract class SimpleCriterionTrigger<T extends AbstractCriterionTriggerI
 
     protected void trigger(ServerPlayer player, Predicate<T> tester) {
         PlayerAdvancements advancementdataplayer = player.getAdvancements();
-        Set<CriterionTrigger.Listener<T>> set = (Set) this.a.get(advancementdataplayer);
+        Set<CriterionTrigger.Listener<T>> set = (Set) advancementdataplayer.criterionData.get(this); // Paper - fix AdvancementDataPlayer leak
 
         if (set != null && !set.isEmpty()) {
             LootContext loottableinfo = EntityPredicate.createContext(player, player);
@@ -67,7 +67,7 @@ public abstract class SimpleCriterionTrigger<T extends AbstractCriterionTriggerI
 
             while (iterator.hasNext()) {
                 criteriontrigger_a = (CriterionTrigger.Listener) iterator.next();
-                T t0 = (AbstractCriterionTriggerInstance) criteriontrigger_a.a();
+                T t0 = (T) criteriontrigger_a.a(); // Paper - decompile fix
 
                 if (t0.getPlayerPredicate().matches(loottableinfo) && tester.test(t0)) {
                     if (list == null) {
diff --git a/src/main/java/net/minecraft/server/PlayerAdvancements.java b/src/main/java/net/minecraft/server/PlayerAdvancements.java
index af8553f1b22e24fbeb732937fbbffc95cb9dfe90..acb41cc3965154c5b515cd8e808bf2cf5dc850e4 100644
--- a/src/main/java/net/minecraft/server/PlayerAdvancements.java
+++ b/src/main/java/net/minecraft/server/PlayerAdvancements.java
@@ -39,6 +39,7 @@ import net.minecraft.advancements.Criterion;
 import net.minecraft.advancements.CriterionProgress;
 import net.minecraft.advancements.CriterionTrigger;
 import net.minecraft.advancements.CriterionTriggerInstance;
+import net.minecraft.advancements.critereon.SimpleCriterionTrigger;
 import net.minecraft.network.chat.ChatType;
 import net.minecraft.network.chat.TranslatableComponent;
 import net.minecraft.network.protocol.game.ClientboundSelectAdvancementsTabPacket;
@@ -69,6 +70,10 @@ public class PlayerAdvancements {
     private Advancement lastSelectedTab;
     private boolean isFirstPacket = true;
 
+    // Paper start - fix advancement data player leakage
+    public final Map<SimpleCriterionTrigger, Set<CriterionTrigger.Listener>> criterionData = Maps.newIdentityHashMap();
+    // Paper end - fix advancement data player leakage
+
     public PlayerAdvancements(DataFixer datafixer, PlayerList playerlist, ServerAdvancementManager advancementdataworld, File file, ServerPlayer entityplayer) {
         this.dataFixer = datafixer;
         this.playerList = playerlist;