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Leaf/leaf-server/minecraft-patches/features/0158-PaperPR-Add-ticket-on-player-join-to-avoid-chunk-loa.patch
2025-05-19 18:07:37 +02:00

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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Jason Penilla <11360596+jpenilla@users.noreply.github.com>
Date: Fri, 13 Sep 2024 14:32:32 -0700
Subject: [PATCH] PaperPR: Add ticket on player join to avoid chunk
load-unload-load cycle
Original license: GPLv3
Original project: https://github.com/PaperMC/Paper
Paper pull request: https://github.com/PaperMC/Paper/pull/11398
Adding the entity will add and then immediately remove an entity load ticket, which would result in the chunk loading and then unloading before being loaded again once the player chunk loader reacts (delay can vary based on rate limit configs)
By adding a ticket with a short removal delay we attempt to keep the chunk loaded until the player chunk loader reacts, but this is not a guarantee due to the aforementioned rate limit configs. Plugins should still handle load/unload events as normal, however this will reduce redundant calls.
The delay is currently set to 2 seconds, however, we may want to adjust this before merging (for example the player chunk unload delay is 5 seconds)
fixes Paper#9581
diff --git a/ca/spottedleaf/moonrise/patches/chunk_system/player/RegionizedPlayerChunkLoader.java b/ca/spottedleaf/moonrise/patches/chunk_system/player/RegionizedPlayerChunkLoader.java
index 2fef24acfaceab21aad6be50e6b29701fa460bfb..e0b61e2cde3010f8dcd2cc764814e94ab6907c77 100644
--- a/ca/spottedleaf/moonrise/patches/chunk_system/player/RegionizedPlayerChunkLoader.java
+++ b/ca/spottedleaf/moonrise/patches/chunk_system/player/RegionizedPlayerChunkLoader.java
@@ -47,6 +47,7 @@ public final class RegionizedPlayerChunkLoader {
public static final TicketType<Long> PLAYER_TICKET = TicketType.create("chunk_system:player_ticket", Long::compareTo);
public static final TicketType<Long> PLAYER_TICKET_DELAYED = TicketType.create("chunk_system:player_ticket_delayed", Long::compareTo, 5 * 20);
+ public static final TicketType<net.minecraft.util.Unit> PLAYER_JOIN = TicketType.create("chunk_system:player_join", (a, b) -> 0, 5 * 20); // Paper - Add ticket on player join to avoid chunk load-unload-load cycle
public static final int MIN_VIEW_DISTANCE = 2;
public static final int MAX_VIEW_DISTANCE = 32;
diff --git a/net/minecraft/server/players/PlayerList.java b/net/minecraft/server/players/PlayerList.java
index 3591de34443069f3f163f8d17df6372c3068611d..842cb6efc8aa7c68b7b9cba144d8540679850f23 100644
--- a/net/minecraft/server/players/PlayerList.java
+++ b/net/minecraft/server/players/PlayerList.java
@@ -432,6 +432,13 @@ public abstract class PlayerList {
// this.broadcastAll(ClientboundPlayerInfoUpdatePacket.createPlayerInitializing(List.of(player))); // CraftBukkit - replaced with loop below
// Paper start - Fire PlayerJoinEvent when Player is actually ready; correctly register player BEFORE PlayerJoinEvent, so the entity is valid and doesn't require tick delay hacks
player.supressTrackerForLogin = true;
+ // Paper start - Add ticket on player join to avoid chunk load-unload-load cycle
+ serverLevel.moonrise$getChunkTaskScheduler().chunkHolderManager.addTicketAtLevel(
+ ca.spottedleaf.moonrise.patches.chunk_system.player.RegionizedPlayerChunkLoader.PLAYER_JOIN,
+ player.chunkPosition(),
+ ca.spottedleaf.moonrise.patches.chunk_system.player.RegionizedPlayerChunkLoader.TICK_TICKET_LEVEL,
+ net.minecraft.util.Unit.INSTANCE);
+ // Paper end - Add ticket on player join to avoid chunk load-unload-load cycle
serverLevel.addNewPlayer(player);
this.server.getCustomBossEvents().onPlayerConnect(player); // see commented out section below serverLevel.addPlayerJoin(player);
// Paper end - Fire PlayerJoinEvent when Player is actually ready