From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Aikar <aikar@aikar.co>
Date: Sat, 13 Sep 2014 23:14:43 -0400
Subject: [PATCH] Configurable Keep Spawn Loaded range per world

This lets you disable it for some worlds and lower it for others.

diff --git a/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java b/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
index 38d25a12c6a52d8a83214e2a0f43a218cf15ceac..ffe9b1a63d78925e1d77b9e730aef42fed6d58fa 100644
--- a/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
+++ b/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
@@ -440,4 +440,10 @@ public class PaperWorldConfig {
                 break;
         }
     }
+
+    public short keepLoadedRange;
+    private void keepLoadedRange() {
+        keepLoadedRange = (short) (getInt("keep-spawn-loaded-range", Math.min(spigotConfig.viewDistance, 10)) * 16);
+        log( "Keep Spawn Loaded Range: " + (keepLoadedRange/16));
+    }
 }
diff --git a/src/main/java/net/minecraft/server/MinecraftServer.java b/src/main/java/net/minecraft/server/MinecraftServer.java
index 9beda5e429b5c520a41d9c7f536dc48dbb6f6f9e..0efe7024493f96bb54e7d8c1ea7b233a1b481a04 100644
--- a/src/main/java/net/minecraft/server/MinecraftServer.java
+++ b/src/main/java/net/minecraft/server/MinecraftServer.java
@@ -716,35 +716,36 @@ public abstract class MinecraftServer extends ReentrantBlockableEventLoop<TickTa
 
     // CraftBukkit start
     public void loadSpawn(ChunkProgressListener worldloadlistener, ServerLevel worldserver) {
-        if (!worldserver.getWorld().getKeepSpawnInMemory()) {
-            return;
-        }
+        ServerChunkCache chunkproviderserver = worldserver.getChunkSource(); // Paper
 
         // WorldServer worldserver = this.E();
         this.forceTicks = true;
         // CraftBukkit end
+        if (worldserver.getWorld().getKeepSpawnInMemory()) { // Paper
 
         MinecraftServer.LOGGER.info("Preparing start region for dimension {}", worldserver.dimension().location());
         BlockPos blockposition = worldserver.getSpawn();
 
         worldloadlistener.updateSpawnPos(new ChunkPos(blockposition));
-        ServerChunkCache chunkproviderserver = worldserver.getChunkSource();
+        //ChunkProviderServer chunkproviderserver = worldserver.getChunkProvider(); // Paper - move up
 
         chunkproviderserver.getLightEngine().setTaskPerBatch(500);
         this.nextTickTime = Util.getMillis();
-        chunkproviderserver.addRegionTicket(TicketType.START, new ChunkPos(blockposition), 11, Unit.INSTANCE);
-
-        while (chunkproviderserver.getTickingGenerated() != 441) {
-            // CraftBukkit start
-            // this.nextTick = SystemUtils.getMonotonicMillis() + 10L;
-            this.executeModerately();
-            // CraftBukkit end
-        }
-
+        // Paper start - configurable spawn reason
+        int radiusBlocks = worldserver.paperConfig.keepLoadedRange;
+        int radiusChunks = radiusBlocks / 16 + ((radiusBlocks & 15) != 0 ? 1 : 0);
+        int totalChunks = ((radiusChunks) * 2 + 1);
+        totalChunks *= totalChunks;
+        worldloadlistener.setChunkRadius(radiusBlocks / 16);
+
+        worldserver.addTicketsForSpawn(radiusBlocks, blockposition);
+        //LOGGER.info("Loaded " + chunkproviderserver.b() + " spawn chunks for world " + worldserver.getWorld().getName()); // Paper
+        // Paper end
         // CraftBukkit start
         // this.nextTick = SystemUtils.getMonotonicMillis() + 10L;
         this.executeModerately();
         // Iterator iterator = this.worldServer.values().iterator();
+        }
 
         if (true) {
             ServerLevel worldserver1 = worldserver;
@@ -767,7 +768,7 @@ public abstract class MinecraftServer extends ReentrantBlockableEventLoop<TickTa
         // this.nextTick = SystemUtils.getMonotonicMillis() + 10L;
         this.executeModerately();
         // CraftBukkit end
-        worldloadlistener.stop();
+        if (worldserver.getWorld().getKeepSpawnInMemory()) worldloadlistener.stop(); // Paper
         chunkproviderserver.getLightEngine().setTaskPerBatch(5);
         // CraftBukkit start
         // this.updateSpawnFlags();
diff --git a/src/main/java/net/minecraft/server/level/ServerLevel.java b/src/main/java/net/minecraft/server/level/ServerLevel.java
index 20b74fc8e1273fcd07ea4417eaedc8bd9aba93b3..b2ddf145ae9f581ec6820deb9cb6a98be87658d7 100644
--- a/src/main/java/net/minecraft/server/level/ServerLevel.java
+++ b/src/main/java/net/minecraft/server/level/ServerLevel.java
@@ -66,6 +66,7 @@ import net.minecraft.network.protocol.game.ClientboundSoundPacket;
 import net.minecraft.network.protocol.game.DebugPackets;
 import net.minecraft.resources.ResourceKey;
 import net.minecraft.resources.ResourceLocation;
+import net.minecraft.server.MCUtil;
 import net.minecraft.server.MinecraftServer;
 import net.minecraft.server.ServerScoreboard;
 import net.minecraft.server.level.progress.ChunkProgressListener;
@@ -1667,12 +1668,88 @@ public class ServerLevel extends net.minecraft.world.level.Level implements Worl
         return ((MapIndex) this.getServer().overworld().getDataStorage().computeIfAbsent(MapIndex::new, "idcounts")).getFreeAuxValueForMap();
     }
 
+    // Paper start - helper function for configurable spawn radius
+    public void addTicketsForSpawn(int radiusInBlocks, BlockPos spawn) {
+        // In order to respect vanilla behavior, which is ensuring everything but the spawn border can tick, we add tickets
+        // with level 31 for the non-border spawn chunks
+        ServerChunkCache chunkproviderserver = this.getChunkSource();
+        int tickRadius = radiusInBlocks - 16;
+
+        // add ticking chunks
+        for (int x = -tickRadius; x <= tickRadius; x += 16) {
+            for (int z = -tickRadius; z <= tickRadius; z += 16) {
+                // radius of 2 will have the current chunk be level 31
+                chunkproviderserver.addRegionTicket(TicketType.START, new ChunkPos(spawn.add(x, 0, z)), 2, Unit.INSTANCE);
+            }
+        }
+
+        // add border chunks
+
+        // add border along x axis (including corner chunks)
+        for (int x = -radiusInBlocks; x <= radiusInBlocks; x += 16) {
+            // top
+            chunkproviderserver.addRegionTicket(TicketType.START, new ChunkPos(spawn.add(x, 0, radiusInBlocks)), 1, Unit.INSTANCE); // level 32
+            // bottom
+            chunkproviderserver.addRegionTicket(TicketType.START, new ChunkPos(spawn.add(x, 0, -radiusInBlocks)), 1, Unit.INSTANCE); // level 32
+        }
+
+        // add border along z axis (excluding corner chunks)
+        for (int z = -radiusInBlocks + 16; z < radiusInBlocks; z += 16) {
+            // right
+            chunkproviderserver.addRegionTicket(TicketType.START, new ChunkPos(spawn.add(radiusInBlocks, 0, z)), 1, Unit.INSTANCE); // level 32
+            // left
+            chunkproviderserver.addRegionTicket(TicketType.START, new ChunkPos(spawn.add(-radiusInBlocks, 0, z)), 1, Unit.INSTANCE); // level 32
+        }
+
+        MCUtil.getSpiralOutChunks(spawn, radiusInBlocks >> 4).forEach(pair -> {
+            getChunkSource().getChunkAtMainThread(pair.x, pair.z);
+        });
+    }
+    public void removeTicketsForSpawn(int radiusInBlocks, BlockPos spawn) {
+        // In order to respect vanilla behavior, which is ensuring everything but the spawn border can tick, we added tickets
+        // with level 31 for the non-border spawn chunks
+        ServerChunkCache chunkproviderserver = this.getChunkSource();
+        int tickRadius = radiusInBlocks - 16;
+
+        // remove ticking chunks
+        for (int x = -tickRadius; x <= tickRadius; x += 16) {
+            for (int z = -tickRadius; z <= tickRadius; z += 16) {
+                // radius of 2 will have the current chunk be level 31
+                chunkproviderserver.removeRegionTicket(TicketType.START, new ChunkPos(spawn.add(x, 0, z)), 2, Unit.INSTANCE);
+            }
+        }
+
+        // remove border chunks
+
+        // remove border along x axis (including corner chunks)
+        for (int x = -radiusInBlocks; x <= radiusInBlocks; x += 16) {
+            // top
+            chunkproviderserver.removeRegionTicket(TicketType.START, new ChunkPos(spawn.add(x, 0, radiusInBlocks)), 1, Unit.INSTANCE); // level 32
+            // bottom
+            chunkproviderserver.removeRegionTicket(TicketType.START, new ChunkPos(spawn.add(x, 0, -radiusInBlocks)), 1, Unit.INSTANCE); // level 32
+        }
+
+        // remove border along z axis (excluding corner chunks)
+        for (int z = -radiusInBlocks + 16; z < radiusInBlocks; z += 16) {
+            // right
+            chunkproviderserver.removeRegionTicket(TicketType.START, new ChunkPos(spawn.add(radiusInBlocks, 0, z)), 1, Unit.INSTANCE); // level 32
+            // left
+            chunkproviderserver.removeRegionTicket(TicketType.START, new ChunkPos(spawn.add(-radiusInBlocks, 0, z)), 1, Unit.INSTANCE); // level 32
+        }
+    }
+    // Paper end
+
     public void setDefaultSpawnPos(BlockPos pos, float angle) {
-        ChunkPos chunkcoordintpair = new ChunkPos(new BlockPos(this.levelData.getXSpawn(), 0, this.levelData.getZSpawn()));
+        // Paper - configurable spawn radius
+        BlockPos prevSpawn = this.getSpawn();
+        //ChunkCoordIntPair chunkcoordintpair = new ChunkCoordIntPair(new BlockPosition(this.worldData.a(), 0, this.worldData.c()));
 
         this.levelData.setSpawn(pos, angle);
-        this.getChunkSource().removeRegionTicket(TicketType.START, chunkcoordintpair, 11, Unit.INSTANCE);
-        this.getChunkSource().addRegionTicket(TicketType.START, new ChunkPos(pos), 11, Unit.INSTANCE);
+        if (this.keepSpawnInMemory) {
+            // if this keepSpawnInMemory is false a plugin has already removed our tickets, do not re-add
+            this.removeTicketsForSpawn(this.paperConfig.keepLoadedRange, prevSpawn);
+            this.addTicketsForSpawn(this.paperConfig.keepLoadedRange, pos);
+        }
         this.getServer().getPlayerList().broadcastAll(new ClientboundSetDefaultSpawnPositionPacket(pos, angle));
     }
 
diff --git a/src/main/java/net/minecraft/server/level/progress/ChunkProgressListener.java b/src/main/java/net/minecraft/server/level/progress/ChunkProgressListener.java
index 2860a16c80e56edb333115f6f64f65d0e56feb11..85863211a666b299cae8a3791c182ae5094b94d9 100644
--- a/src/main/java/net/minecraft/server/level/progress/ChunkProgressListener.java
+++ b/src/main/java/net/minecraft/server/level/progress/ChunkProgressListener.java
@@ -11,4 +11,6 @@ public interface ChunkProgressListener {
     void onStatusChange(ChunkPos pos, @Nullable ChunkStatus status);
 
     void stop();
+
+    void setChunkRadius(int radius); // Paper - allow changing chunk radius
 }
diff --git a/src/main/java/net/minecraft/server/level/progress/LoggerChunkProgressListener.java b/src/main/java/net/minecraft/server/level/progress/LoggerChunkProgressListener.java
index 4a541f0b2582430abda6e5ff8f492e37fc903483..e810843fae13d3e83e8f509810b781859217c48b 100644
--- a/src/main/java/net/minecraft/server/level/progress/LoggerChunkProgressListener.java
+++ b/src/main/java/net/minecraft/server/level/progress/LoggerChunkProgressListener.java
@@ -12,16 +12,24 @@ import org.apache.logging.log4j.Logger;
 public class LoggerChunkProgressListener implements ChunkProgressListener {
 
     private static final Logger LOGGER = LogManager.getLogger();
-    private final int maxCount;
+    private int maxCount; // Paper - remove final
     private int count;
     private long startTime;
     private long nextTickTime = Long.MAX_VALUE;
 
     public LoggerChunkProgressListener(int radius) {
+        // Paper start - Allow changing radius later for configurable spawn patch
+        this.setChunkRadius(radius); // Move to method
+    }
+
+    @Override
+    public void setChunkRadius(int radius) {
+        // Paper - copied from above
         int j = radius * 2 + 1;
 
         this.maxCount = j * j;
     }
+    // Paper end
 
     @Override
     public void updateSpawnPos(ChunkPos spawnPos) {
diff --git a/src/main/java/org/bukkit/craftbukkit/CraftWorld.java b/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
index 6e9e2149d854f26826d030ee6e655ca8fa7b5141..0cb0021fac211996c5bdbb2cfc8f54addc3b49f6 100644
--- a/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
+++ b/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
@@ -1954,15 +1954,21 @@ public class CraftWorld implements World {
 
     @Override
     public void setKeepSpawnInMemory(boolean keepLoaded) {
+        // Paper start - Configurable spawn radius
+        if (keepLoaded == world.keepSpawnInMemory) {
+            // do nothing, nothing has changed
+            return;
+        }
         world.keepSpawnInMemory = keepLoaded;
         // Grab the worlds spawn chunk
-        BlockPos chunkcoordinates = this.world.getSpawn();
+        BlockPos prevSpawn = this.world.getSpawn();
         if (keepLoaded) {
-            world.getChunkSource().addRegionTicket(TicketType.START, new ChunkPos(chunkcoordinates), 11, Unit.INSTANCE);
+            world.addTicketsForSpawn(world.paperConfig.keepLoadedRange, prevSpawn);
         } else {
-            // TODO: doesn't work well if spawn changed....
-            world.getChunkSource().removeRegionTicket(TicketType.START, new ChunkPos(chunkcoordinates), 11, Unit.INSTANCE);
+            // TODO: doesn't work well if spawn changed.... // paper - resolved
+            world.removeTicketsForSpawn(world.paperConfig.keepLoadedRange, prevSpawn);
         }
+        // Paper end
     }
 
     @Override