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/net/minecraft/server/MinecraftServer.java b/src/main/java/net/minecraft/server/MinecraftServer.java
index ddbe9061b518711ed4bb2e30a90817293fd7fb7d..7263a7f8b01c6afdaf67cfd6cc67f6a45c0aee08 100644
--- a/src/main/java/net/minecraft/server/MinecraftServer.java
+++ b/src/main/java/net/minecraft/server/MinecraftServer.java
@@ -768,30 +768,33 @@ public abstract class MinecraftServer extends ReentrantBlockableEventLoop<TickTa
 
     // CraftBukkit start
     public void prepareLevels(ChunkProgressListener worldloadlistener, ServerLevel worldserver) {
+        ServerChunkCache chunkproviderserver = worldserver.getChunkSource(); // Paper - Configurable Keep Spawn Loaded range per world
         // WorldServer worldserver = this.overworld();
         this.forceTicks = true;
         // CraftBukkit end
+        if (worldserver.getWorld().getKeepSpawnInMemory()) { // Paper - Configurable Keep Spawn Loaded range per world
 
         MinecraftServer.LOGGER.info("Preparing start region for dimension {}", worldserver.dimension().location());
         BlockPos blockposition = worldserver.getSharedSpawnPos();
 
         worldloadlistener.updateSpawnPos(new ChunkPos(blockposition));
-        ServerChunkCache chunkproviderserver = worldserver.getChunkSource();
+        //ChunkProviderServer chunkproviderserver = worldserver.getChunkProvider(); // Paper - Configurable Keep Spawn Loaded range per world; move up
 
         this.nextTickTimeNanos = Util.getNanos();
-        // CraftBukkit start
-        if (worldserver.getWorld().getKeepSpawnInMemory()) {
-            chunkproviderserver.addRegionTicket(TicketType.START, new ChunkPos(blockposition), 11, Unit.INSTANCE);
+        // Paper start - Configurable Keep Spawn Loaded range per world
+        int radiusBlocks = worldserver.paperConfig().spawn.keepSpawnLoadedRange * 16;
+        int radiusChunks = radiusBlocks / 16 + ((radiusBlocks & 15) != 0 ? 1 : 0);
+        int totalChunks = ((radiusChunks) * 2 + 1);
+        totalChunks *= totalChunks;
+        worldloadlistener.setChunkRadius(radiusBlocks / 16);
 
-            while (chunkproviderserver.getTickingGenerated() != 441) {
-                // this.nextTickTimeNanos = SystemUtils.getNanos() + MinecraftServer.PREPARE_LEVELS_DEFAULT_DELAY_NANOS;
-                this.executeModerately();
-            }
-        }
+        worldserver.addTicketsForSpawn(radiusBlocks, blockposition);
+        // Paper end - Configurable Keep Spawn Loaded range per world
 
         // this.nextTickTimeNanos = SystemUtils.getNanos() + MinecraftServer.PREPARE_LEVELS_DEFAULT_DELAY_NANOS;
         this.executeModerately();
         // Iterator iterator = this.levels.values().iterator();
+        } // Paper - Configurable Keep Spawn Loaded range per world
 
         if (true) {
             ServerLevel worldserver1 = worldserver;
@@ -814,7 +817,7 @@ public abstract class MinecraftServer extends ReentrantBlockableEventLoop<TickTa
         // this.nextTickTimeNanos = SystemUtils.getNanos() + MinecraftServer.PREPARE_LEVELS_DEFAULT_DELAY_NANOS;
         this.executeModerately();
         // CraftBukkit end
-        worldloadlistener.stop();
+        if (worldserver.getWorld().getKeepSpawnInMemory()) worldloadlistener.stop(); // Paper - Configurable Keep Spawn Loaded range per world
         // CraftBukkit start
         // this.updateMobSpawningFlags();
         worldserver.setSpawnSettings(this.isSpawningMonsters(), this.isSpawningAnimals());
diff --git a/src/main/java/net/minecraft/server/level/ServerLevel.java b/src/main/java/net/minecraft/server/level/ServerLevel.java
index 4e7e3935a0040f48a1dc8f32e3da6d5a3ba154cb..514b3af4f8ac04744ae44cad7c01086a3f821d5f 100644
--- a/src/main/java/net/minecraft/server/level/ServerLevel.java
+++ b/src/main/java/net/minecraft/server/level/ServerLevel.java
@@ -1640,12 +1640,84 @@ public class ServerLevel extends Level implements WorldGenLevel {
         return ((MapIndex) this.getServer().overworld().getDataStorage().computeIfAbsent(MapIndex.factory(), "idcounts")).getFreeAuxValueForMap();
     }
 
+    // Paper start - Configurable Keep Spawn Loaded range per world
+    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.offset(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.offset(x, 0, radiusInBlocks)), 1, Unit.INSTANCE); // level 32
+            // bottom
+            chunkproviderserver.addRegionTicket(TicketType.START, new ChunkPos(spawn.offset(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.offset(radiusInBlocks, 0, z)), 1, Unit.INSTANCE); // level 32
+            // left
+            chunkproviderserver.addRegionTicket(TicketType.START, new ChunkPos(spawn.offset(-radiusInBlocks, 0, z)), 1, Unit.INSTANCE); // level 32
+        }
+    }
+    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.offset(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.offset(x, 0, radiusInBlocks)), 1, Unit.INSTANCE); // level 32
+            // bottom
+            chunkproviderserver.removeRegionTicket(TicketType.START, new ChunkPos(spawn.offset(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.offset(radiusInBlocks, 0, z)), 1, Unit.INSTANCE); // level 32
+            // left
+            chunkproviderserver.removeRegionTicket(TicketType.START, new ChunkPos(spawn.offset(-radiusInBlocks, 0, z)), 1, Unit.INSTANCE); // level 32
+        }
+    }
+    // Paper end - Configurable Keep Spawn Loaded range per world
+
     public void setDefaultSpawnPos(BlockPos pos, float angle) {
-        ChunkPos chunkcoordintpair = new ChunkPos(new BlockPos(this.levelData.getXSpawn(), 0, this.levelData.getZSpawn()));
+        // Paper start - Configurable Keep Spawn Loaded range per world
+        BlockPos prevSpawn = this.getSharedSpawnPos();
+        //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().spawn.keepSpawnLoadedRange * 16, prevSpawn);
+            this.addTicketsForSpawn(this.paperConfig().spawn.keepSpawnLoadedRange * 16, 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 1b565b2809c2d367e21971c5154f35c9763995e6..4792eaa30464f4c4ca7f2d6cf20f734beed81f23 100644
--- a/src/main/java/net/minecraft/server/level/progress/ChunkProgressListener.java
+++ b/src/main/java/net/minecraft/server/level/progress/ChunkProgressListener.java
@@ -12,4 +12,6 @@ public interface ChunkProgressListener {
     void start();
 
     void stop();
+
+    void setChunkRadius(int radius); // Paper - Configurable Keep Spawn Loaded range per world
 }
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 4d2348df25410a0b5364eec066880326d6667dad..3754cda7e7731935893359d84f3ae06157a347c6 100644
--- a/src/main/java/net/minecraft/server/level/progress/LoggerChunkProgressListener.java
+++ b/src/main/java/net/minecraft/server/level/progress/LoggerChunkProgressListener.java
@@ -11,12 +11,19 @@ import org.slf4j.Logger;
 
 public class LoggerChunkProgressListener implements ChunkProgressListener {
     private static final Logger LOGGER = LogUtils.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 - Configurable Keep Spawn Loaded range per world
+        this.setChunkRadius(radius); // Move to method
+    }
+
+    @Override
+    public void setChunkRadius(int radius) {
+        // Paper end - Configurable Keep Spawn Loaded range per world
         int i = radius * 2 + 1;
         this.maxCount = i * i;
     }
diff --git a/src/main/java/org/bukkit/craftbukkit/CraftWorld.java b/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
index 83530c6823710e387f453898fc0d81392cd2fcd8..6bb9d76f8c5f3dc683caecfbb7c7c2ca41cba659 100644
--- a/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
+++ b/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
@@ -1391,15 +1391,21 @@ public class CraftWorld extends CraftRegionAccessor implements World {
 
     @Override
     public void setKeepSpawnInMemory(boolean keepLoaded) {
+        // Paper start - Configurable spawn radius
+        if (keepLoaded == this.world.keepSpawnInMemory) {
+            // do nothing, nothing has changed
+            return;
+        }
         this.world.keepSpawnInMemory = keepLoaded;
         // Grab the worlds spawn chunk
         BlockPos chunkcoordinates = this.world.getSharedSpawnPos();
         if (keepLoaded) {
-            this.world.getChunkSource().addRegionTicket(TicketType.START, new ChunkPos(chunkcoordinates), 11, Unit.INSTANCE);
+            this.world.addTicketsForSpawn(this.world.paperConfig().spawn.keepSpawnLoadedRange * 16, chunkcoordinates);
         } else {
-            // TODO: doesn't work well if spawn changed....
-            this.world.getChunkSource().removeRegionTicket(TicketType.START, new ChunkPos(chunkcoordinates), 11, Unit.INSTANCE);
+            // TODO: doesn't work well if spawn changed.... // Paper - resolved
+            this.world.removeTicketsForSpawn(this.world.paperConfig().spawn.keepSpawnLoadedRange * 16, chunkcoordinates);
         }
+        // Paper end
     }
 
     @Override