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 c8d8d766de86dc3e47b06a355b28d2279820c570..a60b40d8cc802456374625af216c27998f8348b3 100644
--- a/src/main/java/net/minecraft/server/network/ServerLoginPacketListenerImpl.java
+++ b/src/main/java/net/minecraft/server/network/ServerLoginPacketListenerImpl.java
@@ -117,6 +117,18 @@ public class ServerLoginPacketListenerImpl implements ServerLoginPacketListener
 
     }
 
+    // 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()
     {
@@ -209,8 +221,8 @@ public class ServerLoginPacketListenerImpl implements ServerLoginPacketListener
             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 {
@@ -221,7 +233,8 @@ public class ServerLoginPacketListenerImpl implements ServerLoginPacketListener
                         server.server.getLogger().log(java.util.logging.Level.WARNING, "Exception verifying " + ServerLoginPacketListenerImpl.this.gameProfile.getName(), ex);
                     }
                 }
-            }.start();
+            });
+            // Paper end
             // Spigot end
         }
 
@@ -250,7 +263,8 @@ public class ServerLoginPacketListenerImpl implements ServerLoginPacketListener
             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;
 
@@ -295,10 +309,8 @@ public class ServerLoginPacketListenerImpl implements ServerLoginPacketListener
 
                 return ServerLoginPacketListenerImpl.this.server.getPreventProxyConnections() && socketaddress instanceof InetSocketAddress ? ((InetSocketAddress) socketaddress).getAddress() : null;
             }
-        };
-
-        thread.setUncaughtExceptionHandler(new DefaultUncaughtExceptionHandler(ServerLoginPacketListenerImpl.LOGGER));
-        thread.start();
+        });
+        // Paper end
     }
 
     // Spigot start