From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Kevin Raneri <kevin.raneri@gmail.com>
Date: Mon, 30 Sep 2024 09:50:55 -0700
Subject: [PATCH] Configurable Entity Despawn Time


diff --git a/src/main/java/net/minecraft/world/entity/Entity.java b/src/main/java/net/minecraft/world/entity/Entity.java
index 8be1b051543cda2b2e9e3d337834757e53f442de..ed5b00620527c1776722d25b1b45f1544802a341 100644
--- a/src/main/java/net/minecraft/world/entity/Entity.java
+++ b/src/main/java/net/minecraft/world/entity/Entity.java
@@ -432,6 +432,7 @@ public abstract class Entity implements SyncedDataHolder, Nameable, EntityAccess
     private UUID originWorld;
     public boolean freezeLocked = false; // Paper - Freeze Tick Lock API
     public boolean fixedPose = false; // Paper - Expand Pose API
+    private final int despawnTime; // Paper - entity despawn time limit
 
     public void setOrigin(@javax.annotation.Nonnull Location location) {
         this.origin = location.toVector();
@@ -614,6 +615,7 @@ public abstract class Entity implements SyncedDataHolder, Nameable, EntityAccess
 
     public Entity(EntityType<?> type, Level world) {
         this.id = Entity.ENTITY_COUNTER.incrementAndGet();
+        this.despawnTime = type == EntityType.PLAYER ? -1 : world.paperConfig().entities.spawning.despawnTime.getOrDefault(type, io.papermc.paper.configuration.type.number.IntOr.Disabled.DISABLED).or(-1); // Paper - entity despawn time limit
         this.passengers = ImmutableList.of();
         this.deltaMovement = Vec3.ZERO;
         this.bb = Entity.INITIAL_AABB;
@@ -912,6 +914,12 @@ public abstract class Entity implements SyncedDataHolder, Nameable, EntityAccess
     }
 
     public void tick() {
+        // Paper start - entity despawn time limit
+        if (this.despawnTime >= 0 && this.tickCount >= this.despawnTime) {
+            this.discard(org.bukkit.event.entity.EntityRemoveEvent.Cause.DESPAWN);
+            return;
+        }
+        // Paper end - entity despawn time limit
         this.baseTick();
     }