Paper/Spigot-API-Patches/0123-Add-async-chunk-load-API.patch

From b242c5647547578b7d9d41871ce3e6f9a3e07931 Mon Sep 17 00:00:00 2001
From: Aikar <aikar@aikar.co>
Date: Mon, 29 Feb 2016 17:43:33 -0600
Subject: [PATCH] Add async chunk load API


diff --git a/src/main/java/org/bukkit/World.java b/src/main/java/org/bukkit/World.java
index 5e6cb56ab..dbbcfec99 100644
--- a/src/main/java/org/bukkit/World.java
+++ b/src/main/java/org/bukkit/World.java
@@ -137,6 +137,78 @@ public interface World extends PluginMessageRecipient, Metadatable {
      */
     public Chunk getChunkAt(Block block);
 
+    /**
+     * Used by {@link World#getChunkAtAsync(Location,ChunkLoadCallback)} methods
+     * to request a {@link Chunk} to be loaded, with this callback receiving
+     * the chunk when it is finished.
+     *
+     * This callback will be executed on synchronously on the main thread.
+     *
+     * Timing and order this callback is fired is intentionally not defined and
+     * and subject to change.
+     */
+    public static interface ChunkLoadCallback {
+        public void onLoad(Chunk chunk);
+    }
+
+    /**
+     * Requests a {@link Chunk} to be loaded at the given coordinates
+     *
+     * This method makes no guarantee on how fast the chunk will load,
+     * and will return the chunk to the callback at a later time.
+     *
+     * You should use this method if you need a chunk but do not need it
+     * immediately, and you wish to let the server control the speed
+     * of chunk loads, keeping performance in mind.
+     *
+     * The {@link ChunkLoadCallback} will always be executed synchronously
+     * on the main Server Thread.
+     *
+     * @param x Chunk X-coordinate of the chunk - (world coordinate / 16)
+     * @param z Chunk Z-coordinate of the chunk - (world coordinate / 16)
+     * @param cb Callback to receive the chunk when it is loaded.
+     *           will be executed synchronously
+     */
+    public void getChunkAtAsync(int x, int z, ChunkLoadCallback cb);
+
+    /**
+     * Requests a {@link Chunk} to be loaded at the given {@link Location}
+     *
+     * This method makes no guarantee on how fast the chunk will load,
+     * and will return the chunk to the callback at a later time.
+     *
+     * You should use this method if you need a chunk but do not need it
+     * immediately, and you wish to let the server control the speed
+     * of chunk loads, keeping performance in mind.
+     *
+     * The {@link ChunkLoadCallback} will always be executed synchronously
+     * on the main Server Thread.
+     *
+     * @param location Location of the chunk
+     * @param cb Callback to receive the chunk when it is loaded.
+     *           will be executed synchronously
+     */
+    public void getChunkAtAsync(Location location, ChunkLoadCallback cb);
+
+    /**
+     * Requests {@link Chunk} to be loaded that contains the given {@link Block}
+     *
+     * This method makes no guarantee on how fast the chunk will load,
+     * and will return the chunk to the callback at a later time.
+     *
+     * You should use this method if you need a chunk but do not need it
+     * immediately, and you wish to let the server control the speed
+     * of chunk loads, keeping performance in mind.
+     *
+     * The {@link ChunkLoadCallback} will always be executed synchronously
+     * on the main Server Thread.
+     *
+     * @param block Block to get the containing chunk from
+     * @param cb Callback to receive the chunk when it is loaded.
+     *           will be executed synchronously
+     */
+    public void getChunkAtAsync(Block block, ChunkLoadCallback cb);
+
     /**
      * Checks if the specified {@link Chunk} is loaded
      *
-- 
2.18.0