From fe90f3351f14e18c2f52fd111ca191e0d3b14940 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 saving


diff --git a/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java b/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
index b854061983..58109e1308 100644
--- a/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
+++ b/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
@@ -494,4 +494,19 @@ public class PaperWorldConfig {
         keepLoadedRange = (short) (getInt("keep-spawn-loaded-range", Math.min(spigotConfig.viewDistance, 10)) * 16);
         log( "Keep Spawn Loaded Range: " + (keepLoadedRange/16));
     }
+
+    public int autoSavePeriod = -1;
+    private void autoSavePeriod() {
+        autoSavePeriod = getInt("auto-save-interval", -1);
+        if (autoSavePeriod > 0) {
+            log("Auto Save Interval: " +autoSavePeriod + " (" + (autoSavePeriod / 20) + "s)");
+        } else if (autoSavePeriod < 0) {
+            autoSavePeriod = net.minecraft.server.MinecraftServer.getServer().autosavePeriod;
+        }
+    }
+
+    public int maxAutoSaveChunksPerTick = 24;
+    private void maxAutoSaveChunksPerTick() {
+        maxAutoSaveChunksPerTick = getInt("max-auto-save-chunks-per-tick", 24);
+    }
 }
diff --git a/src/main/java/net/minecraft/server/Chunk.java b/src/main/java/net/minecraft/server/Chunk.java
index 5bf781bb63..e2a48695df 100644
--- a/src/main/java/net/minecraft/server/Chunk.java
+++ b/src/main/java/net/minecraft/server/Chunk.java
@@ -42,7 +42,7 @@ public class Chunk implements IChunkAccess {
     private TickList<Block> o;
     private TickList<FluidType> p;
     private boolean q;
-    private long lastSaved;
+    public long lastSaved; // Paper
     private volatile boolean s;
     private long t;
     @Nullable
diff --git a/src/main/java/net/minecraft/server/MinecraftServer.java b/src/main/java/net/minecraft/server/MinecraftServer.java
index b401ff7695..485725c0ae 100644
--- a/src/main/java/net/minecraft/server/MinecraftServer.java
+++ b/src/main/java/net/minecraft/server/MinecraftServer.java
@@ -155,6 +155,7 @@ public abstract class MinecraftServer extends IAsyncTaskHandlerReentrant<TickTas
     public static int currentTick = 0; // Paper - Further improve tick loop
     public java.util.Queue<Runnable> processQueue = new java.util.concurrent.ConcurrentLinkedQueue<Runnable>();
     public int autosavePeriod;
+    public boolean serverAutoSave = false; // Paper
     public File bukkitDataPackFolder;
     public CommandDispatcher vanillaCommandDispatcher;
     private boolean forceTicks;
@@ -1071,14 +1072,28 @@ public abstract class MinecraftServer extends IAsyncTaskHandlerReentrant<TickTas
             this.serverPing.b().a(agameprofile);
         }
 
-        if (autosavePeriod > 0 && this.ticks % autosavePeriod == 0) { // CraftBukkit
+        //if (autosavePeriod > 0 && this.ticks % autosavePeriod == 0) { // CraftBukkit // Paper - move down
             MinecraftServer.LOGGER.debug("Autosave started");
+            serverAutoSave = (autosavePeriod > 0 && this.ticks % autosavePeriod == 0); // Paper
             this.methodProfiler.enter("save");
+            if (autosavePeriod > 0 && this.ticks % autosavePeriod == 0) { // Paper
             this.playerList.savePlayers();
-            this.saveChunks(true, false, false);
+            }// Paper
+            // Paper start
+            for (WorldServer world : getWorlds()) {
+                if (world.paperConfig.autoSavePeriod > 0) {
+                    try {
+                        world.save(null, false, world.isSavingDisabled());
+                    } catch (ExceptionWorldConflict exceptionWorldConflict) {
+                        MinecraftServer.LOGGER.warn(exceptionWorldConflict.getMessage());
+                    }
+                }
+            }
+            // Paper end
+
             this.methodProfiler.exit();
             MinecraftServer.LOGGER.debug("Autosave finished");
-        }
+        //} // Paper
 
         this.methodProfiler.enter("snooper");
         if (((DedicatedServer) this).getDedicatedServerProperties().snooperEnabled && !this.snooper.d() && this.ticks > 100) { // Spigot
diff --git a/src/main/java/net/minecraft/server/PlayerChunkMap.java b/src/main/java/net/minecraft/server/PlayerChunkMap.java
index d85220b66c..c4ad039ffd 100644
--- a/src/main/java/net/minecraft/server/PlayerChunkMap.java
+++ b/src/main/java/net/minecraft/server/PlayerChunkMap.java
@@ -293,15 +293,32 @@ public class PlayerChunkMap extends IChunkLoader implements PlayerChunk.d {
             });
             PlayerChunkMap.LOGGER.info("ThreadedAnvilChunkStorage ({}): All chunks are saved", this.x.getName());
         } else {
-            this.visibleChunks.values().stream().filter(PlayerChunk::hasBeenLoaded).forEach((playerchunk) -> {
+            // Paper start
+            int savedThisTick = 0;
+            for (PlayerChunk playerchunk : this.visibleChunks.values()) {
+                if (!playerchunk.hasBeenLoaded()) continue;
+                // Paper end
                 IChunkAccess ichunkaccess = (IChunkAccess) playerchunk.getChunkSave().getNow(null); // CraftBukkit - decompile error
 
                 if (ichunkaccess instanceof ProtoChunkExtension || ichunkaccess instanceof Chunk) {
-                    this.saveChunk(ichunkaccess);
+                    // paper start
+                    boolean shouldSave = true;
+
+                    if (ichunkaccess instanceof Chunk) {
+                        shouldSave = ((Chunk) ichunkaccess).lastSaved + world.paperConfig.autoSavePeriod <= world.getTime();
+                    }
+
+                    if (shouldSave && this.saveChunk(ichunkaccess)) {
+                        ++savedThisTick;
                     playerchunk.m();
                 }
 
-            });
+                    if (savedThisTick >= world.paperConfig.maxAutoSaveChunksPerTick) {
+                        return;
+                    }
+                }
+            };
+            // paper end
         }
 
     }
diff --git a/src/main/java/net/minecraft/server/WorldServer.java b/src/main/java/net/minecraft/server/WorldServer.java
index d086af67f9..52523789b2 100644
--- a/src/main/java/net/minecraft/server/WorldServer.java
+++ b/src/main/java/net/minecraft/server/WorldServer.java
@@ -755,8 +755,9 @@ public class WorldServer extends World {
         ChunkProviderServer chunkproviderserver = this.getChunkProvider();
 
         if (!flag1) {
-            org.bukkit.Bukkit.getPluginManager().callEvent(new org.bukkit.event.world.WorldSaveEvent(getWorld())); // CraftBukkit
+            if (flag || server.serverAutoSave) org.bukkit.Bukkit.getPluginManager().callEvent(new org.bukkit.event.world.WorldSaveEvent(getWorld())); // CraftBukkit // Paper - full saves only
             try (co.aikar.timings.Timing ignored = timings.worldSave.startTiming()) { // Paper
+            if (flag || server.serverAutoSave) { // Paper
             if (iprogressupdate != null) {
                 iprogressupdate.a(new ChatMessage("menu.savingLevel", new Object[0]));
             }
@@ -765,6 +766,7 @@ public class WorldServer extends World {
             if (iprogressupdate != null) {
                 iprogressupdate.c(new ChatMessage("menu.savingChunks", new Object[0]));
             }
+            } // Paper
 
             timings.worldSaveChunks.startTiming(); // Paper
             chunkproviderserver.save(flag);
-- 
2.22.0