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 40f2f4d052add3b4270d29c843e49fb621e1bc8d..54803d561d98b0d3fd8aa2060a7a184a00dd9da6 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
@@ -39,7 +39,7 @@ 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 - Sanitise RegionFileCache and make configurable
                 ((RegionFile) this.regionCache.removeLast()).close();
             }