From 4bbc098121fe0157622312f0ae244fb124d1db4b Mon Sep 17 00:00:00 2001
From: William Blake Galbreath <blake.galbreath@gmail.com>
Date: Wed, 22 May 2019 22:30:08 -0500
Subject: [PATCH] Tick loop config options

---
 .../net/minecraft/server/MinecraftServer.java | 31 +++++++++++++------
 .../java/net/pl3x/purpur/PurpurConfig.java    |  7 +++++
 2 files changed, 28 insertions(+), 10 deletions(-)

diff --git a/src/main/java/net/minecraft/server/MinecraftServer.java b/src/main/java/net/minecraft/server/MinecraftServer.java
index fc57f154f..0a4d37cd4 100644
--- a/src/main/java/net/minecraft/server/MinecraftServer.java
+++ b/src/main/java/net/minecraft/server/MinecraftServer.java
@@ -865,16 +865,21 @@ public abstract class MinecraftServer extends IAsyncTaskHandlerReentrant<TickTas
                 long start = System.nanoTime(), curTime, tickSection = start; // Paper - Further improve server tick loop
                 lastTick = start - TICK_TIME; // Paper
                 while (this.isRunning) {
-                    long i = ((curTime = System.nanoTime()) / (1000L * 1000L)) - this.nextTick; // Paper
-
-                    if (i > 5000L && this.nextTick - this.lastOverloadTime >= 30000L) { // CraftBukkit
-                        long j = i / 50L;
-
-                        if (server.getWarnOnOverload()) // CraftBukkit
-                            MinecraftServer.LOGGER.warn("Can't keep up! Is the server overloaded? Running {}ms or {} ticks behind", i, j);
-                        this.nextTick += j * 50L;
-                        this.lastOverloadTime = this.nextTick;
+                    // Purpur start - tick overload
+                    curTime = System.nanoTime();
+                    if (net.pl3x.purpur.PurpurConfig.enableTickOverload) {
+                        long i = ((curTime) / (1000L * 1000L)) - this.nextTick; // Paper
+
+                        if (i > 5000L && this.nextTick - this.lastOverloadTime >= 30000L) { // CraftBukkit
+                            long j = i / 50L;
+
+                            if (server.getWarnOnOverload()) // CraftBukkit
+                                MinecraftServer.LOGGER.warn("Can't keep up! Is the server overloaded? Running {}ms or {} ticks behind", i, j);
+                            this.nextTick += j * 50L;
+                            this.lastOverloadTime = this.nextTick;
+                        }
                     }
+                    // Purpur end - tick overload
 
                     if ( ++MinecraftServer.currentTick % SAMPLE_INTERVAL == 0 )
                     {
@@ -905,7 +910,13 @@ public abstract class MinecraftServer extends IAsyncTaskHandlerReentrant<TickTas
                     this.a(this::canSleepForTick);
                     this.methodProfiler.exitEnter("nextTickWait");
                     this.ac = true;
-                    this.ab = Math.max(SystemUtils.getMonotonicMillis() + 50L, this.nextTick);
+                    // Purpur start - tps catchup
+                    if (net.pl3x.purpur.PurpurConfig.enableTPSCatchup) {
+                        this.ab = Math.max(SystemUtils.getMonotonicMillis() + 50L, this.nextTick);
+                    } else {
+                        this.ab = this.nextTick = curTime / 1000000L + 50L;
+                    }
+                    // Purpur end - tps catchup
                     this.sleepForTick();
                     this.methodProfiler.exit();
                     this.methodProfiler.b();
diff --git a/src/main/java/net/pl3x/purpur/PurpurConfig.java b/src/main/java/net/pl3x/purpur/PurpurConfig.java
index 38f9d3a3a..99b7abd6d 100644
--- a/src/main/java/net/pl3x/purpur/PurpurConfig.java
+++ b/src/main/java/net/pl3x/purpur/PurpurConfig.java
@@ -103,6 +103,13 @@ public class PurpurConfig {
         return config.getString(path, config.getString(path));
     }
 
+    public static boolean enableTickOverload = false;
+    public static boolean enableTPSCatchup = false;
+    private static void tickLoopSettings() {
+        enableTickOverload = getBoolean("settings.enable-tick-overload", enableTickOverload);
+        enableTPSCatchup = getBoolean("settings.enable-tps-catchup", enableTPSCatchup);
+    }
+
     public static boolean requireShiftToMount = true;
     private static void requireShiftToMount() {
         requireShiftToMount = getBoolean("settings.mobs.require-shift-to-mount", requireShiftToMount);
-- 
2.20.1