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/com/destroystokyo/paper/PaperConfig.java b/src/main/java/com/destroystokyo/paper/PaperConfig.java
index de5d6b692e3e05fcf704c01dc602197992991386..1096b7462480c6c130545c03df8d8bed9c09ab79 100644
--- a/src/main/java/com/destroystokyo/paper/PaperConfig.java
+++ b/src/main/java/com/destroystokyo/paper/PaperConfig.java
@@ -232,4 +232,9 @@ public class PaperConfig {
     private static void loadPermsBeforePlugins() {
         loadPermsBeforePlugins = getBoolean("settings.load-permissions-yml-before-plugins", true);
     }
+
+    public static int regionFileCacheSize = 256;
+    private static void regionFileCacheSize() {
+        regionFileCacheSize = Math.max(getInt("settings.region-file-cache-size", 256), 4);
+    }
 }
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 e506fa1153cabfb93c7bece73e6fe0fafbb958c9..f973792c8ee4523eb4efdf31d0a97cb3358e1b3b 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
@@ -35,7 +35,7 @@ public class RegionFileStorage implements AutoCloseable {
         if (regionfile != null) {
             return regionfile;
         } else {
-            if (this.regionCache.size() >= 256) {
+            if (this.regionCache.size() >= com.destroystokyo.paper.PaperConfig.regionFileCacheSize) { // Paper - configurable
                 ((RegionFile) this.regionCache.removeLast()).close();
             }