Paper/patches/server/0081-Sanitise-RegionFileCache-and-make-configurable.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Antony Riley <antony@cyberiantiger.org>
Date: Tue, 29 Mar 2016 08:22:55 +0300
Subject: [PATCH] Sanitise RegionFileCache and make configurable.

RegionFileCache prior to this patch would close every single open region
file upon reaching a size of 256.
This patch modifies that behaviour so it closes the the least recently
used RegionFile.
The implementation uses a LinkedHashMap as an LRU cache (modified from HashMap).
The maximum size of the RegionFileCache is also made configurable.

diff --git a/src/main/java/net/minecraft/world/level/chunk/storage/RegionFileStorage.java b/src/main/java/net/minecraft/world/level/chunk/storage/RegionFileStorage.java
index 8fc4eb15732536c5f8c49c7914071d3c7667f340..81710e2853a75a47edd0abf3f5b30f8558b5abcd 100644
--- a/src/main/java/net/minecraft/world/level/chunk/storage/RegionFileStorage.java
+++ b/src/main/java/net/minecraft/world/level/chunk/storage/RegionFileStorage.java
@@ -37,7 +37,7 @@ public final class RegionFileStorage implements AutoCloseable {
         if (regionfile != null) {
             return regionfile;
         } else {
-            if (this.regionCache.size() >= 256) {
+            if (this.regionCache.size() >= io.papermc.paper.configuration.GlobalConfiguration.get().misc.regionFileCacheSize) { // Paper - configurable
                 ((RegionFile) this.regionCache.removeLast()).close();
             }