patches/server/0961-Lazily-create-LootContext-for-criterions.patch


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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: MrPowerGamerBR <git@mrpowergamerbr.com>
Date: Tue, 21 Nov 2023 12:16:39 -0300
Subject: [PATCH] Lazily create LootContext for criterions

For each player on each tick, enter block triggers are invoked, and these create loot contexts that are promptly thrown away since the trigger doesn't pass the predicate

To avoid this, we now lazily create the LootContext if the criterion passes the predicate AND if any of the listener triggers require a loot context instance

diff --git a/src/main/java/net/minecraft/advancements/critereon/SimpleCriterionTrigger.java b/src/main/java/net/minecraft/advancements/critereon/SimpleCriterionTrigger.java
index 670e59432979740caf283d839c2f42c9748fe215..9c95c83e74c84e15c8d03503fc3cd0ee10044fd3 100644
--- a/src/main/java/net/minecraft/advancements/critereon/SimpleCriterionTrigger.java
+++ b/src/main/java/net/minecraft/advancements/critereon/SimpleCriterionTrigger.java
@@ -44,14 +44,14 @@ public abstract class SimpleCriterionTrigger<T extends SimpleCriterionTrigger.Si
         PlayerAdvancements playerAdvancements = player.getAdvancements();
         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);
+            LootContext lootContext = null; // EntityPredicate.createContext(player, player); // Paper - Perf: lazily create LootContext for criterions
             List<CriterionTrigger.Listener<T>> list = null;
 
             for (CriterionTrigger.Listener<T> listener : set) {
                 T simpleInstance = listener.trigger();
                 if (predicate.test(simpleInstance)) {
                     Optional<ContextAwarePredicate> optional = simpleInstance.player();
-                    if (optional.isEmpty() || optional.get().matches(lootContext)) {
+                    if (optional.isEmpty() || optional.get().matches(lootContext = (lootContext == null ? EntityPredicate.createContext(player, player) : lootContext))) { // Paper - Perf: lazily create LootContext for criterions
                         if (list == null) {
                             list = Lists.newArrayList();
                         }