Paper/nms-patches/RegionFileCache.patch

--- a/net/minecraft/server/RegionFileCache.java
+++ b/net/minecraft/server/RegionFileCache.java
@@ -74,19 +74,29 @@
         RegionFileCache.a.clear();
     }
 
-    public static DataInputStream d(File file, int i, int j) {
+    // CraftBukkit start - call sites hoisted for synchronization
+    public static synchronized NBTTagCompound d(File file, int i, int j) throws IOException {
         RegionFile regionfile = a(file, i, j);
 
-        return regionfile.a(i & 31, j & 31);
+        DataInputStream datainputstream = regionfile.a(i & 31, j & 31);
+
+        if (datainputstream == null) {
+            return null;
+        }
+
+        return NBTCompressedStreamTools.a(datainputstream);
     }
 
-    public static DataOutputStream e(File file, int i, int j) {
+    public static synchronized void e(File file, int i, int j, NBTTagCompound nbttagcompound) throws IOException {
         RegionFile regionfile = a(file, i, j);
 
-        return regionfile.b(i & 31, j & 31);
+        DataOutputStream dataoutputstream = regionfile.b(i & 31, j & 31);
+        NBTCompressedStreamTools.a(nbttagcompound, (java.io.DataOutput) dataoutputstream);
+        dataoutputstream.close();
     }
+    // CraftBukkit end
 
-    public static boolean f(File file, int i, int j) {
+    public static synchronized boolean f(File file, int i, int j) { // PAIL chunkExists; CraftBukkit
         RegionFile regionfile = b(file, i, j);
 
         return regionfile != null ? regionfile.c(i & 31, j & 31) : false;