From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: BuildTools <46540330+willkroboth@users.noreply.github.com>
Date: Fri, 19 Aug 2022 16:11:51 -0400
Subject: [PATCH] Add method isTickingWorlds() to Bukkit.


diff --git a/src/main/java/org/bukkit/Bukkit.java b/src/main/java/org/bukkit/Bukkit.java
index ac6a49e39790aa9f12c7d98990f4cac297200cb0..ef36d793ab77c7b7208f8f5994815599cff470d1 100644
--- a/src/main/java/org/bukkit/Bukkit.java
+++ b/src/main/java/org/bukkit/Bukkit.java
@@ -774,12 +774,26 @@ public final class Bukkit {
         return server.getWorlds();
     }
 
+    // Paper start
+    /**
+     * Gets whether the worlds are being ticked right now.
+     *
+     * @return true if the worlds are being ticked, false otherwise.
+     */
+    public static boolean isTickingWorlds(){
+        return server.isTickingWorlds();
+    }
+    // Paper end
+
     /**
      * Creates or loads a world with the given name using the specified
      * options.
      * <p>
      * If the world is already loaded, it will just return the equivalent of
      * getWorld(creator.name()).
+     * <p>
+     * Do note that un/loading worlds mid-tick may have potential side effects, we strongly recommend
+     * ensuring that you're not un/loading worlds midtick by checking {@link Bukkit#isTickingWorlds()}
      *
      * @param creator the options to use when creating the world
      * @return newly created or loaded world
@@ -791,6 +805,9 @@ public final class Bukkit {
 
     /**
      * Unloads a world with the given name.
+     * <p>
+     * Do note that un/loading worlds mid-tick may have potential side effects, we strongly recommend
+     * ensuring that you're not un/loading worlds midtick by checking {@link Bukkit#isTickingWorlds()}
      *
      * @param name Name of the world to unload
      * @param save whether to save the chunks before unloading
@@ -802,6 +819,9 @@ public final class Bukkit {
 
     /**
      * Unloads the given world.
+     * <p>
+     * Do note that un/loading worlds mid-tick may have potential side effects, we strongly recommend
+     * ensuring that you're not un/loading worlds midtick by checking {@link Bukkit#isTickingWorlds()}
      *
      * @param world the world to unload
      * @param save whether to save the chunks before unloading
diff --git a/src/main/java/org/bukkit/Server.java b/src/main/java/org/bukkit/Server.java
index 18f4ae463f0e1406842c451b91f333a1bfabae69..5b225bbb128893d67251a96ab318035802a0cf76 100644
--- a/src/main/java/org/bukkit/Server.java
+++ b/src/main/java/org/bukkit/Server.java
@@ -647,34 +647,55 @@ public interface Server extends PluginMessageRecipient, net.kyori.adventure.audi
     @NotNull
     public List<World> getWorlds();
 
+    // Paper start
+    /**
+     * Gets whether the worlds are being ticked right now.
+     *
+     * @return true if the worlds are being ticked, false otherwise.
+     */
+    public boolean isTickingWorlds();
+    // Paper end
+
     /**
      * Creates or loads a world with the given name using the specified
      * options.
      * <p>
      * If the world is already loaded, it will just return the equivalent of
      * getWorld(creator.name()).
+     * <p>
+     * Do note that un/loading worlds mid-tick may have potential side effects, we strongly recommend
+     * ensuring that you're not un/loading worlds midtick by checking {@link Bukkit#isTickingWorlds()}
      *
      * @param creator the options to use when creating the world
      * @return newly created or loaded world
+     * @throws IllegalStateException when {@link #isTickingWorlds() isTickingWorlds} is true
      */
     @Nullable
     public World createWorld(@NotNull WorldCreator creator);
 
     /**
      * Unloads a world with the given name.
+     * <p>
+     * Do note that un/loading worlds mid-tick may have potential side effects, we strongly recommend
+     * ensuring that you're not un/loading worlds midtick by checking {@link Bukkit#isTickingWorlds()}
      *
      * @param name Name of the world to unload
      * @param save whether to save the chunks before unloading
      * @return true if successful, false otherwise
+     * @throws IllegalStateException when {@link #isTickingWorlds() isTickingWorlds} is true
      */
     public boolean unloadWorld(@NotNull String name, boolean save);
 
     /**
      * Unloads the given world.
+     * <p>
+     * Do note that un/loading worlds mid-tick may have potential side effects, we strongly recommend
+     * ensuring that you're not un/loading worlds midtick by checking {@link Bukkit#isTickingWorlds()}
      *
      * @param world the world to unload
      * @param save whether to save the chunks before unloading
      * @return true if successful, false otherwise
+     * @throws IllegalStateException when {@link #isTickingWorlds() isTickingWorlds} is true
      */
     public boolean unloadWorld(@NotNull World world, boolean save);