From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Jake Potrebic <jake.m.potrebic@gmail.com>
Date: Tue, 22 Mar 2022 12:44:30 -0700
Subject: [PATCH] Throw exception on world create while being ticked

There are no plans to support creating worlds while worlds are
being ticked themselvess.

diff --git a/src/main/java/net/minecraft/server/MinecraftServer.java b/src/main/java/net/minecraft/server/MinecraftServer.java
index 0420e92207a8b106d9b70f92774b21bb1dc19b25..91771afb413b56ff84697f4d1264e2e97ee5c132 100644
--- a/src/main/java/net/minecraft/server/MinecraftServer.java
+++ b/src/main/java/net/minecraft/server/MinecraftServer.java
@@ -311,6 +311,7 @@ public abstract class MinecraftServer extends ReentrantBlockableEventLoop<TickTa
     // Spigot end
     public final io.papermc.paper.configuration.PaperConfigurations paperConfigurations; // Paper - add paper configuration files
     public static long currentTickLong = 0L; // Paper - track current tick as a long
+    public boolean isIteratingOverLevels = false; // Paper - Throw exception on world create while being ticked
 
     public static <S extends MinecraftServer> S spin(Function<Thread, S> serverFactory) {
         AtomicReference<S> atomicreference = new AtomicReference();
@@ -1555,7 +1556,7 @@ public abstract class MinecraftServer extends ReentrantBlockableEventLoop<TickTa
         this.getFunctions().tick();
         MinecraftTimings.commandFunctionsTimer.stopTiming(); // Spigot // Paper
         this.profiler.popPush("levels");
-        Iterator iterator = this.getAllLevels().iterator();
+        //Iterator iterator = this.getAllLevels().iterator(); // Paper - Throw exception on world create while being ticked; moved down
 
         // CraftBukkit start
         // Run tasks that are waiting on processing
@@ -1587,6 +1588,8 @@ public abstract class MinecraftServer extends ReentrantBlockableEventLoop<TickTa
         // Paper end - Perf: Optimize time updates
         MinecraftTimings.timeUpdateTimer.stopTiming(); // Spigot // Paper
 
+        this.isIteratingOverLevels = true; // Paper - Throw exception on world create while being ticked
+        Iterator iterator = this.getAllLevels().iterator(); // Paper - Throw exception on world create while being ticked; move down
         while (iterator.hasNext()) {
             ServerLevel worldserver = (ServerLevel) iterator.next();
             worldserver.hasPhysicsEvent = org.bukkit.event.block.BlockPhysicsEvent.getHandlerList().getRegisteredListeners().length > 0; // Paper - BlockPhysicsEvent
@@ -1627,6 +1630,7 @@ public abstract class MinecraftServer extends ReentrantBlockableEventLoop<TickTa
             this.profiler.pop();
             worldserver.explosionDensityCache.clear(); // Paper - Optimize explosions
         }
+        this.isIteratingOverLevels = false; // Paper - Throw exception on world create while being ticked
 
         this.profiler.popPush("connection");
         MinecraftTimings.connectionTimer.startTiming(); // Spigot // Paper
diff --git a/src/main/java/org/bukkit/craftbukkit/CraftServer.java b/src/main/java/org/bukkit/craftbukkit/CraftServer.java
index fbfc9e45e7740c0560affb2f1c135032fa5aecc9..6a4ade9e6d741fbc5ca878047df6a35cf24a8461 100644
--- a/src/main/java/org/bukkit/craftbukkit/CraftServer.java
+++ b/src/main/java/org/bukkit/craftbukkit/CraftServer.java
@@ -904,6 +904,11 @@ public final class CraftServer implements Server {
         return new ArrayList<World>(this.worlds.values());
     }
 
+    @Override
+    public boolean isTickingWorlds() {
+        return console.isIteratingOverLevels;
+    }
+
     public DedicatedPlayerList getHandle() {
         return this.playerList;
     }
@@ -1166,6 +1171,7 @@ public final class CraftServer implements Server {
     @Override
     public World createWorld(WorldCreator creator) {
         Preconditions.checkState(this.console.getAllLevels().iterator().hasNext(), "Cannot create additional worlds on STARTUP");
+        //Preconditions.checkState(!this.console.isIteratingOverLevels, "Cannot create a world while worlds are being ticked"); // Paper - Cat - Temp disable. We'll see how this goes.
         Preconditions.checkArgument(creator != null, "WorldCreator cannot be null");
 
         String name = creator.name();
@@ -1342,6 +1348,7 @@ public final class CraftServer implements Server {
 
     @Override
     public boolean unloadWorld(World world, boolean save) {
+        //Preconditions.checkState(!this.console.isIteratingOverLevels, "Cannot unload a world while worlds are being ticked"); // Paper - Cat - Temp disable. We'll see how this goes.
         if (world == null) {
             return false;
         }