Paper/Spigot-Server-Patches/0087-Sanitise-RegionFileCache-and-make-configurable.patch

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From f66ef986b6349909793d94ae5f6087a3eb8302c0 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 492df2c8e..0778f53e2 100644
--- a/src/main/java/com/destroystokyo/paper/PaperConfig.java
+++ b/src/main/java/com/destroystokyo/paper/PaperConfig.java
@@ -228,4 +228,9 @@ 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 = getInt("settings.region-file-cache-size", 256);
+ }
}
diff --git a/src/main/java/net/minecraft/server/RegionFileCache.java b/src/main/java/net/minecraft/server/RegionFileCache.java
index 5dbd1d517..964996976 100644
--- a/src/main/java/net/minecraft/server/RegionFileCache.java
+++ b/src/main/java/net/minecraft/server/RegionFileCache.java
@@ -9,10 +9,12 @@ import java.io.IOException;
import java.util.Iterator;
import java.util.Map;
import javax.annotation.Nullable;
+import com.destroystokyo.paper.PaperConfig; // Paper
+import java.util.LinkedHashMap; // Paper
public class RegionFileCache {
- public static final Map<File, RegionFile> cache = Maps.newHashMap();
+ public static final Map<File, RegionFile> cache = new LinkedHashMap(PaperConfig.regionFileCacheSize, 0.75f, true); // Paper - HashMap -> LinkedHashMap
public static synchronized RegionFile a(File file, int i, int j) {
File file1 = new File(file, "region");
@@ -27,7 +29,7 @@ public class RegionFileCache {
}
if (RegionFileCache.cache.size() >= 256) {
- a();
+ trimCache();
}
RegionFile regionfile1 = new RegionFile(file2);
@@ -60,6 +62,22 @@ public class RegionFileCache {
}
// CraftBukkit end
+ // Paper Start
+ private static synchronized void trimCache() {
+ Iterator<Map.Entry<File, RegionFile>> itr = RegionFileCache.cache.entrySet().iterator();
+ int count = RegionFileCache.cache.size() - PaperConfig.regionFileCacheSize;
+ while (count-- >= 0 && itr.hasNext()) {
+ try {
+ itr.next().getValue().close();
+ } catch (IOException ioexception) {
+ ioexception.printStackTrace();
+ ServerInternalException.reportInternalException(ioexception);
+ }
+ itr.remove();
+ }
+ }
+ // Paper End
+
public static synchronized void a() {
Iterator iterator = RegionFileCache.cache.values().iterator();
--
2.20.0