Paper/patches/server/1048-Incremental-chunk-and-player-saving.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Shane Freeder <theboyetronic@gmail.com>
Date: Sun, 9 Jun 2019 03:53:22 +0100
Subject: [PATCH] Incremental chunk and player saving

Feature patch

diff --git a/src/main/java/net/minecraft/server/MinecraftServer.java b/src/main/java/net/minecraft/server/MinecraftServer.java
index ca70815b73199835b88c9d68c8a01699536d320f..be6e64d5c858961b19eb7b1b028530c1eb4c68d7 100644
--- a/src/main/java/net/minecraft/server/MinecraftServer.java
+++ b/src/main/java/net/minecraft/server/MinecraftServer.java
@@ -1007,7 +1007,7 @@ public abstract class MinecraftServer extends ReentrantBlockableEventLoop<TickTa
 
         try {
             this.isSaving = true;
-            this.getPlayerList().saveAll();
+            this.getPlayerList().saveAll(); // Paper - Incremental chunk and player saving; diff on change
             flag3 = this.saveAllChunks(suppressLogs, flush, force);
         } finally {
             this.isSaving = false;
@@ -1655,9 +1655,29 @@ public abstract class MinecraftServer extends ReentrantBlockableEventLoop<TickTa
         }
 
         --this.ticksUntilAutosave;
-        if (this.autosavePeriod > 0 && this.ticksUntilAutosave <= 0) { // CraftBukkit
-            this.autoSave();
+        // Paper start - Incremental chunk and player saving
+        final ProfilerFiller profiler = Profiler.get();
+        int playerSaveInterval = io.papermc.paper.configuration.GlobalConfiguration.get().playerAutoSave.rate;
+        if (playerSaveInterval < 0) {
+            playerSaveInterval = autosavePeriod;
+        }
+        profiler.push("save");
+        final boolean fullSave = autosavePeriod > 0 && this.tickCount % autosavePeriod == 0;
+        try {
+            this.isSaving = true;
+            if (playerSaveInterval > 0) {
+                this.playerList.saveAll(playerSaveInterval);
+            }
+            for (final ServerLevel level : this.getAllLevels()) {
+                if (level.paperConfig().chunks.autoSaveInterval.value() > 0) {
+                    level.saveIncrementally(fullSave);
+                }
+            }
+        } finally {
+            this.isSaving = false;
         }
+        profiler.pop();
+        // Paper end - Incremental chunk and player saving
 
         ProfilerFiller gameprofilerfiller = Profiler.get();
 
diff --git a/src/main/java/net/minecraft/server/level/ServerLevel.java b/src/main/java/net/minecraft/server/level/ServerLevel.java
index d81be1069ef6ce51789df38ce21f125b6d524945..dc523c3017939d4a206f28617e5aacd83e5d2334 100644
--- a/src/main/java/net/minecraft/server/level/ServerLevel.java
+++ b/src/main/java/net/minecraft/server/level/ServerLevel.java
@@ -1353,6 +1353,30 @@ public class ServerLevel extends Level implements ServerEntityGetter, WorldGenLe
         return !this.server.isUnderSpawnProtection(this, pos, player) && this.getWorldBorder().isWithinBounds(pos);
     }
 
+    // Paper start - Incremental chunk and player saving
+    public void saveIncrementally(boolean doFull) {
+        ServerChunkCache chunkproviderserver = this.getChunkSource();
+
+        if (doFull) {
+            org.bukkit.Bukkit.getPluginManager().callEvent(new org.bukkit.event.world.WorldSaveEvent(getWorld()));
+        }
+
+        if (doFull) {
+            this.saveLevelData(true);
+        }
+        // chunk autosave is already called by the ChunkSystem during unload processing (ChunkMap#processUnloads)
+        // Copied from save()
+        // CraftBukkit start - moved from MinecraftServer.saveChunks
+        if (doFull) { // Paper
+            ServerLevel worldserver1 = this;
+            this.serverLevelData.setWorldBorder(worldserver1.getWorldBorder().createSettings());
+            this.serverLevelData.setCustomBossEvents(this.server.getCustomBossEvents().save(this.registryAccess()));
+            this.convertable.saveDataTag(this.server.registryAccess(), this.serverLevelData, this.server.getPlayerList().getSingleplayerData());
+        }
+        // CraftBukkit end
+    }
+    // Paper end - Incremental chunk and player saving
+
     public void save(@Nullable ProgressListener progressListener, boolean flush, boolean savingDisabled) {
         // Paper start - add close param
         this.save(progressListener, flush, savingDisabled, false);
diff --git a/src/main/java/net/minecraft/server/level/ServerPlayer.java b/src/main/java/net/minecraft/server/level/ServerPlayer.java
index 2b6c5b2387b67f25d8877849ccbfaaa77eab51d3..05981a075898794b899f1327bff1e7ca8ef8fc13 100644
--- a/src/main/java/net/minecraft/server/level/ServerPlayer.java
+++ b/src/main/java/net/minecraft/server/level/ServerPlayer.java
@@ -221,6 +221,7 @@ import org.bukkit.inventory.MainHand;
 public class ServerPlayer extends net.minecraft.world.entity.player.Player implements ca.spottedleaf.moonrise.patches.chunk_system.player.ChunkSystemServerPlayer { // Paper - rewrite chunk system
 
     private static final Logger LOGGER = LogUtils.getLogger();
+    public long lastSave = MinecraftServer.currentTick; // Paper - Incremental chunk and player saving
     private static final int NEUTRAL_MOB_DEATH_NOTIFICATION_RADII_XZ = 32;
     private static final int NEUTRAL_MOB_DEATH_NOTIFICATION_RADII_Y = 10;
     private static final int FLY_STAT_RECORDING_SPEED = 25;
diff --git a/src/main/java/net/minecraft/server/players/PlayerList.java b/src/main/java/net/minecraft/server/players/PlayerList.java
index 47664c545e3f58719f55366bac05732dbfe3c00a..a03ff473a683611670ee274b0eec5a395ee6981a 100644
--- a/src/main/java/net/minecraft/server/players/PlayerList.java
+++ b/src/main/java/net/minecraft/server/players/PlayerList.java
@@ -518,6 +518,7 @@ public abstract class PlayerList {
 
     protected void save(ServerPlayer player) {
         if (!player.getBukkitEntity().isPersistent()) return; // CraftBukkit
+        player.lastSave = MinecraftServer.currentTick; // Paper - Incremental chunk and player saving
         this.playerIo.save(player);
         ServerStatsCounter serverstatisticmanager = (ServerStatsCounter) player.getStats(); // CraftBukkit
 
@@ -1152,9 +1153,21 @@ public abstract class PlayerList {
     }
 
     public void saveAll() {
+        // Paper start - Incremental chunk and player saving
+        this.saveAll(-1);
+    }
+
+    public void saveAll(int interval) {
         io.papermc.paper.util.MCUtil.ensureMain("Save Players" , () -> { // Paper - Ensure main
+        int numSaved = 0;
+        long now = MinecraftServer.currentTick;
         for (int i = 0; i < this.players.size(); ++i) {
-            this.save((ServerPlayer) this.players.get(i));
+            final ServerPlayer player = this.players.get(i);
+            if (interval == -1 || now - player.lastSave >= interval) {
+                this.save(player);
+                if (interval != -1 && ++numSaved >= io.papermc.paper.configuration.GlobalConfiguration.get().playerAutoSave.maxPerTick()) { break; }
+            }
+            // Paper end - Incremental chunk and player saving
         }
 
         return null; }); // Paper - ensure main