PaperMC/patches/server/0470-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/SimpleCriterionTrigger.java b/src/main/java/net/minecraft/advancements/critereon/SimpleCriterionTrigger.java
index 06fc39b19385d36fd0c5bb9a7042a238eb6e8a57..bb1f0e9dbcb792d015d1cb65664a96fdd3e0489e 100644
--- a/src/main/java/net/minecraft/advancements/critereon/SimpleCriterionTrigger.java
+++ b/src/main/java/net/minecraft/advancements/critereon/SimpleCriterionTrigger.java
@@ -14,22 +14,24 @@ import net.minecraft.server.level.ServerPlayer;
 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>>> players = Maps.newIdentityHashMap();
+    //private final Map<PlayerAdvancements, Set<CriterionTrigger.Listener<T>>> players = Maps.newIdentityHashMap(); // Paper - moved into AdvancementDataPlayer to fix memory leak
+
+    public SimpleCriterionTrigger() {}
 
     @Override
     public final void addPlayerListener(PlayerAdvancements manager, CriterionTrigger.Listener<T> conditions) {
-        this.players.computeIfAbsent(manager, (managerx) -> {
+        manager.criterionData.computeIfAbsent(this, (managerx) -> { // Paper - fix AdvancementDataPlayer leak
             return Sets.newHashSet();
         }).add(conditions);
     }
 
     @Override
     public final void removePlayerListener(PlayerAdvancements manager, CriterionTrigger.Listener<T> conditions) {
-        Set<CriterionTrigger.Listener<T>> set = this.players.get(manager);
+        Set<CriterionTrigger.Listener<T>> set = (Set) manager.criterionData.get(this); // Paper - fix AdvancementDataPlayer leak
         if (set != null) {
             set.remove(conditions);
             if (set.isEmpty()) {
-                this.players.remove(manager);
+                manager.criterionData.remove(this); // Paper - fix AdvancementDataPlayer leak
             }
         }
 
@@ -37,7 +39,7 @@ public abstract class SimpleCriterionTrigger<T extends AbstractCriterionTriggerI
 
     @Override
     public final void removePlayerListeners(PlayerAdvancements tracker) {
-        this.players.remove(tracker);
+        tracker.criterionData.remove(this); // Paper - fix AdvancementDataPlayer leak
     }
 
     protected abstract T createInstance(JsonObject obj, EntityPredicate.Composite playerPredicate, DeserializationContext predicateDeserializer);
@@ -50,7 +52,7 @@ public abstract class SimpleCriterionTrigger<T extends AbstractCriterionTriggerI
 
     protected void trigger(ServerPlayer player, Predicate<T> predicate) {
         PlayerAdvancements playerAdvancements = player.getAdvancements();
-        Set<CriterionTrigger.Listener<T>> set = this.players.get(playerAdvancements);
+        Set<CriterionTrigger.Listener<T>> set = (Set) playerAdvancements.criterionData.get(this); // Paper - fix AdvancementDataPlayer leak
         if (set != null && !set.isEmpty()) {
             LootContext lootContext = EntityPredicate.createContext(player, player);
             List<CriterionTrigger.Listener<T>> list = null;
diff --git a/src/main/java/net/minecraft/server/PlayerAdvancements.java b/src/main/java/net/minecraft/server/PlayerAdvancements.java
index 736e604205c0dcbe2cf1f1e0d507f53a9c0d941b..a4f2eb219cc57303cc6642e6782700591e423cf4 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.Component;
 import net.minecraft.network.protocol.game.ClientboundSelectAdvancementsTabPacket;
@@ -69,6 +70,8 @@ public class PlayerAdvancements {
     private Advancement lastSelectedTab;
     private boolean isFirstPacket = true;
 
+    public final Map<SimpleCriterionTrigger, Set<CriterionTrigger.Listener>> criterionData = Maps.newIdentityHashMap(); // Paper - fix advancement data player leakage
+
     public PlayerAdvancements(DataFixer dataFixer, PlayerList playerManager, ServerAdvancementManager advancementLoader, File advancementFile, ServerPlayer owner) {
         this.dataFixer = dataFixer;
         this.playerList = playerManager;