Backport 1.20's 'pause-when-empty-seconds' server property

dependencies.gradle

@@ -61,7 +61,7 @@ dependencies {
     transformedModCompileOnly(deobf("https://forum.industrial-craft.net/core/attachment/4316-advancedsolarpanel-1-7-10-3-5-1-jar/"))
     transformedModCompileOnly(rfg.deobf("curse.maven:candycraft-251118:2330488"))
 
-    devOnlyNonPublishable(deobf("https://github.com/makamys/CoreTweaks/releases/download/0.3.3.2/CoreTweaks-1.7.10-0.3.3.2+nomixin.jar"))
+    transformedModCompileOnly(deobf("https://github.com/makamys/CoreTweaks/releases/download/0.3.3.2/CoreTweaks-1.7.10-0.3.3.2+nomixin.jar"))
 }
 
 // Replace when RFG support deobfuscation from notch mappings

src/main/java/com/mitchej123/hodgepodge/config/TweaksConfig.java

@@ -128,6 +128,10 @@ public class TweaksConfig {
     @Config.DefaultInt(900)
     public static int autoSaveInterval;
 
+    @Config.Comment("Backports 1.20's 'pause-when-empty-seconds' server property")
+    @Config.DefaultBoolean(true)
+    public static boolean pauseWhenEmpty;
+
     @Config.Comment("Reduces water opacity from 3 to 1, to match modern")
     @Config.DefaultBoolean(false)
     public static boolean useLighterWater;
@@ -306,5 +310,4 @@ public class TweaksConfig {
     @Config.Comment("Avoids droping items on container close, and instead places them in the player inventory. (Inspired from EFR)")
     @Config.DefaultBoolean(true)
     public static boolean avoidDroppingItemsWhenClosing;
-
 }

src/main/java/com/mitchej123/hodgepodge/mixins/Mixins.java

@@ -418,6 +418,11 @@ public enum Mixins {
             .addMixinClasses("minecraft.server.MixinMinecraftServer_AutoSaveInterval")
             .setApplyIf(() -> TweaksConfig.autoSaveInterval != 900)),
 
+    PAUSE_WHEN_EMPTY(new Builder("Pauses the server when noone is online after X seconds; Servers Only").setPhase(Phase.EARLY).setSide(Side.SERVER)
+            .addTargetedMod(TargetedMod.VANILLA)
+            .addMixinClasses("minecraft.server.MixinMinecraftServer_PauseWhenEmpty")
+            .setApplyIf(() -> TweaksConfig.pauseWhenEmpty)),
+
     LIGHTER_WATER(new Builder("Decreases water opacity from 3 to 1, like in modern").setPhase(Phase.EARLY)
             .setSide(Side.BOTH).addTargetedMod(TargetedMod.VANILLA).addMixinClasses("minecraft.MixinBlock_LighterWater")
             .setApplyIf(() -> TweaksConfig.useLighterWater)),

src/main/java/com/mitchej123/hodgepodge/mixins/early/minecraft/server/MixinMinecraftServer_PauseWhenEmpty.java

@@ -0,0 +1,64 @@
+package com.mitchej123.hodgepodge.mixins.early.minecraft.server;
+
+import com.mitchej123.hodgepodge.Common;
+import com.mitchej123.hodgepodge.Hodgepodge;
+import net.minecraft.server.MinecraftServer;
+import net.minecraft.server.dedicated.DedicatedServer;
+import net.minecraft.server.dedicated.PropertyManager;
+import org.apache.logging.log4j.LogManager;
+import org.apache.logging.log4j.Logger;
+import org.spongepowered.asm.logging.ILogger;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.Shadow;
+import org.spongepowered.asm.mixin.Unique;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Inject;
+import org.spongepowered.asm.mixin.injection.callback.CallbackInfoReturnable;
+
+import java.io.File;
+import java.net.Proxy;
+
+@Mixin(DedicatedServer.class)
+public abstract class MixinMinecraftServer_PauseWhenEmpty extends MinecraftServer {
+    @Shadow private PropertyManager settings;
+
+    @Unique
+    private int hodgepodge$pauseWhenEmptySeconds = 0;
+    @Unique
+    private int hodgepodge$emptyTicks = 0;
+
+    public MixinMinecraftServer_PauseWhenEmpty(File workDir, Proxy proxy) {
+        super(workDir, proxy);
+    }
+
+    @Inject(method = "startServer", at = @At(value = "INVOKE", target = "Lcpw/mods/fml/common/FMLCommonHandler;onServerStarted()V", shift = At.Shift.AFTER))
+    public void hodgepodge$setupServer(CallbackInfoReturnable<Boolean> cir){
+        hodgepodge$pauseWhenEmptySeconds = settings.getIntProperty("pause-when-empty-seconds", 0);
+    }
+
+    @Override
+    public void tick(){
+        int pauseTicks = hodgepodge$pauseWhenEmptySeconds * 20;
+        if (pauseTicks > 0){
+            if (getCurrentPlayerCount() == 0){
+                this.hodgepodge$emptyTicks++;
+            } else {
+                this.hodgepodge$emptyTicks = 0;
+            }
+
+            if (hodgepodge$emptyTicks >= pauseTicks){
+                if (hodgepodge$emptyTicks == pauseTicks){
+                    Common.log.info("Server empty for {} seconds, saving and pausing", hodgepodge$pauseWhenEmptySeconds);
+                    this.serverConfigManager.saveAllPlayerData();
+                    this.saveAllWorlds(true);
+                }
+
+                // to process new connections
+                this.func_147137_ag().networkTick();
+                return;
+            }
+        }
+
+        super.tick();
+    }
+}

src/main/resources/META-INF/hodgepodge_at.cfg

@@ -23,4 +23,6 @@ public net.minecraft.client.resources.SimpleReloadableResourceManager field_1105
 public net.minecraft.entity.EntityList field_75624_e # classToIDMapping
 public net.minecraft.world.WorldServer func_73053_d()V # wakeAllPlayers()
 
+protected net.minecraft.server.MinecraftServer field_71318_t # serverConfigManager
+
 public net.minecraft.server.management.PlayerManager$PlayerInstance