Leaf/patches/server/0048-Faster-sequencing-of-futures-for-chunk-structure-gen.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Dreeam <61569423+Dreeam-qwq@users.noreply.github.com>
Date: Tue, 2 Jan 2024 21:13:53 -0500
Subject: [PATCH] Faster sequencing of futures for chunk structure gen

Replace `thenApply` with `thenCompose`. Once one task is completed then the next task starts immediately,
to prevent blocking threads while waiting to complete all tasks

diff --git a/src/main/java/net/minecraft/Util.java b/src/main/java/net/minecraft/Util.java
index 169edd91e25f3c1d27f8a9e2bca58a6143c8a891..3212768d1d8e8922bd88de407add163868837b42 100644
--- a/src/main/java/net/minecraft/Util.java
+++ b/src/main/java/net/minecraft/Util.java
@@ -409,9 +409,11 @@ public class Util {
             return futures.get(0).thenApply(List::of);
         } else {
             CompletableFuture<Void> completableFuture = CompletableFuture.allOf(futures.toArray(new CompletableFuture[0]));
-            return completableFuture.thenApply((void_) -> {
-                return futures.stream().map(CompletableFuture::join).toList();
-            });
+            // Leaf start - Faster sequencing of futures for chunk structure gen
+            return completableFuture.thenCompose((void_) ->
+                    CompletableFuture.supplyAsync(() ->
+                            futures.stream().map(CompletableFuture::join).toList()));
+            // Leaf end
         }
     }