added deep frozen state where chunk tickets will not be expiring as well, preventing chunks from unloading. Fixes #204

src/main/java/carpet/commands/TickCommand.java

@@ -43,7 +43,8 @@ public class TickCommand
                                                 c.getSource(),
                                                 getInteger(c,"ticks"),
                                                 getString(c, "tail command")))))).
-                then(literal("freeze").executes( (c)-> toggleFreeze(c.getSource()))).
+                then(literal("freeze").executes( (c)-> toggleFreeze(c.getSource(), false)).
+                        then(literal("deep").executes( (c)-> toggleFreeze(c.getSource(), true)))).
                 then(literal("step").
                         executes((c) -> step(1)).
                         then(argument("ticks", integer(1,72000)).
@@ -95,15 +96,18 @@ public class TickCommand
         return 1;
     }
 
-    private static int toggleFreeze(ServerCommandSource source)
+    private static int toggleFreeze(ServerCommandSource source, boolean isDeep)
     {
         TickSpeed.is_paused = !TickSpeed.is_paused;
         if (TickSpeed.is_paused)
         {
-            Messenger.m(source, "gi Game is paused");
+            TickSpeed.deepFreeze = isDeep;
+            Messenger.m(source, "gi Game is "+(isDeep?"deeply ":"")+"frozen");
+
         }
         else
         {
+            TickSpeed.deepFreeze = false;
             Messenger.m(source, "gi Game runs normally");
         }
         return 1;

src/main/java/carpet/helpers/TickSpeed.java

@@ -25,6 +25,7 @@ public class TickSpeed
     public static ServerCommandSource tick_warp_sender = null;
     public static int player_active_timeout = 0;
     public static boolean process_entities = true;
+    public static boolean deepFreeze = false;
     public static boolean is_paused = false;
     public static boolean is_superHot = false;
 

src/main/java/carpet/mixins/ChunkTicketManager_tickMixin.java

@@ -0,0 +1,23 @@
+package carpet.mixins;
+
+import carpet.helpers.TickSpeed;
+import net.minecraft.server.world.ChunkTicketManager;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.Shadow;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Inject;
+import org.spongepowered.asm.mixin.injection.callback.CallbackInfo;
+
+@Mixin(ChunkTicketManager.class)
+public class ChunkTicketManager_tickMixin
+{
+    @Shadow private long age;
+
+    @Inject(method = "purge", at = @At("HEAD"), cancellable = true)
+    private void pauseTicketSystem(CallbackInfo ci)
+    {
+        // pausing expiry of tickets
+        // that will prevent also chunks from unloading, so require a deep frozen state
+        if (!TickSpeed.process_entities && TickSpeed.deepFreeze) age--;
+    }
+}

src/main/java/carpet/mixins/MinecraftServer_tickspeedMixin.java

@@ -120,7 +120,7 @@ public abstract class MinecraftServer_tickspeedMixin extends ReentrantThreadExec
 
             this.profiler.startTick();
             this.profiler.push("tick");
-            this.tick(TickSpeed.time_warp_start_time != 0 ? ()->true : this::shouldKeepTicking);
+            this.tick(TickSpeed.time_warp_start_time != 0 ? ()->!hasRunningTasks() : this::shouldKeepTicking);
             this.profiler.swap("nextTickWait");
             this.field_19249 = true;
             this.field_19248 = Math.max(Util.getMeasuringTimeMs() + /*50L*/ msThisTick, this.timeReference);