From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Alfie Cleveland <alfeh@me.com>
Date: Fri, 25 Nov 2016 13:22:40 +0000
Subject: [PATCH] Cache user authenticator threads


diff --git a/src/main/java/net/minecraft/server/network/ServerLoginPacketListenerImpl.java b/src/main/java/net/minecraft/server/network/ServerLoginPacketListenerImpl.java
index 5054c3208d1723a33a96d23edcbc9f1483b879e5..72bc5648706380639440456fc938d9350e12f1cc 100644
--- a/src/main/java/net/minecraft/server/network/ServerLoginPacketListenerImpl.java
+++ b/src/main/java/net/minecraft/server/network/ServerLoginPacketListenerImpl.java
@@ -122,6 +122,18 @@ public class ServerLoginPacketListenerImpl implements TickablePacketListener, Se
 
     }
 
+    // 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 -> {
+                Thread ret = new Thread(r, "User Authenticator #" + threadId.incrementAndGet());
+
+                ret.setUncaughtExceptionHandler(new DefaultUncaughtExceptionHandler(LOGGER));
+
+                return ret;
+            }
+    );
+    // Paper end
     // Spigot start
     public void initUUID()
     {
@@ -258,8 +270,8 @@ public class ServerLoginPacketListenerImpl implements TickablePacketListener, Se
                 this.connection.send(new ClientboundHelloPacket("", this.server.getKeyPair().getPublic().getEncoded(), this.nonce));
             } else {
                 // Spigot start
-                new Thread("User Authenticator #" + ServerLoginPacketListenerImpl.UNIQUE_THREAD_ID.incrementAndGet()) {
-
+            // Paper start - Cache authenticator threads
+            authenticatorPool.execute(new Runnable() {
                     @Override
                     public void run() {
                         try {
@@ -270,7 +282,8 @@ public class ServerLoginPacketListenerImpl implements TickablePacketListener, Se
                             server.server.getLogger().log(java.util.logging.Level.WARNING, "Exception verifying " + ServerLoginPacketListenerImpl.this.gameProfile.getName(), ex);
                         }
                     }
-                }.start();
+            });
+            // Paper end
                 // Spigot end
             }
 
@@ -313,7 +326,8 @@ public class ServerLoginPacketListenerImpl implements TickablePacketListener, Se
             throw new IllegalStateException("Protocol error", cryptographyexception);
         }
 
-        Thread thread = new Thread("User Authenticator #" + ServerLoginPacketListenerImpl.UNIQUE_THREAD_ID.incrementAndGet()) {
+        // Paper start - Cache authenticator threads
+        authenticatorPool.execute(new Runnable() {
             public void run() {
                 GameProfile gameprofile = ServerLoginPacketListenerImpl.this.gameProfile;
 
@@ -358,10 +372,8 @@ public class ServerLoginPacketListenerImpl implements TickablePacketListener, Se
 
                 return ServerLoginPacketListenerImpl.this.server.getPreventProxyConnections() && socketaddress instanceof InetSocketAddress ? ((InetSocketAddress) socketaddress).getAddress() : null;
             }
-        };
-
-        thread.setUncaughtExceptionHandler(new DefaultUncaughtExceptionHandler(ServerLoginPacketListenerImpl.LOGGER));
-        thread.start();
+        });
+        // Paper end
     }
 
     // Spigot start