From 5932dddd728efb8aad079283e90ce638dfe95471 Mon Sep 17 00:00:00 2001
From: vemacs <d@nkmem.es>
Date: Wed, 23 Nov 2016 08:31:45 -0500
Subject: [PATCH] Cache user authenticator threads


diff --git a/src/main/java/net/minecraft/server/LoginListener.java b/src/main/java/net/minecraft/server/LoginListener.java
index a22f4c55e9..b6e8296824 100644
--- a/src/main/java/net/minecraft/server/LoginListener.java
+++ b/src/main/java/net/minecraft/server/LoginListener.java
@@ -93,6 +93,12 @@ public class LoginListener implements PacketLoginInListener, ITickable {
 
     }
 
+    // Paper start - Cache authenticator threads
+    private static final AtomicInteger threadId = new AtomicInteger(0);
+    private static final java.util.concurrent.ExecutorService authenticatorPool = java.util.concurrent.Executors.newCachedThreadPool(
+            r -> new Thread(r, "User Authenticator #" + threadId.incrementAndGet())
+    );
+    // Paper end
     // Spigot start
     public void initUUID()
     {
@@ -169,8 +175,8 @@ public class LoginListener implements PacketLoginInListener, ITickable {
             this.networkManager.sendPacket(new PacketLoginOutEncryptionBegin("", this.server.G().getPublic(), this.e));
         } else {
             // Spigot start
-            new Thread("User Authenticator #" + LoginListener.b.incrementAndGet()) {
-
+            // Paper start - Cache authenticator threads
+            authenticatorPool.execute(new Runnable() {
                 @Override
                 public void run() {
                     try {
@@ -182,7 +188,8 @@ public class LoginListener implements PacketLoginInListener, ITickable {
                         server.server.getLogger().log(java.util.logging.Level.WARNING, "Exception verifying " + i.getName(), ex);
                     }
                 }
-            }.start();
+            });
+            // Paper end
             // Spigot end
         }
 
@@ -198,7 +205,8 @@ public class LoginListener implements PacketLoginInListener, ITickable {
             this.loginKey = packetlogininencryptionbegin.a(privatekey);
             this.g = LoginListener.EnumProtocolState.AUTHENTICATING;
             this.networkManager.a(this.loginKey);
-            Thread thread = new Thread("User Authenticator #" + LoginListener.b.incrementAndGet()) {
+            // Paper start - Cache authenticator threads
+            authenticatorPool.execute(new Runnable() {
                 public void run() {
                     GameProfile gameprofile = LoginListener.this.i;
 
@@ -245,10 +253,8 @@ public class LoginListener implements PacketLoginInListener, ITickable {
 
                     return LoginListener.this.server.U() && socketaddress instanceof InetSocketAddress ? ((InetSocketAddress) socketaddress).getAddress() : null;
                 }
-            };
-
-            thread.setUncaughtExceptionHandler(new DefaultUncaughtExceptionHandler(LoginListener.c));
-            thread.start();
+            });
+            // Paper end
         }
     }
 
-- 
2.18.0