Rework sim status update to not need a thread.

Rather than polling at 60Hz (which may be faster than the tick rate,
wasting cycles; and also makes synchronization annoying), collect events
during the tick and emit them after (rate limited, pooling events until
it is time for another event to send).

This can be improved by paying attention to the aircraft update list,
which would allow us to avoid updating aircraft that don't have a status
change. To do that we need to be able to quickly lookup a FlightJs
matching a Flight through, and Flight isn't hashable.

We should also be removing dead events and de-duplicating. Currently
each flight has an update for every tick, but only the latest one
matters. Combat update events also don't matter if the same combat is
new in the update.

https://github.com/dcs-liberation/dcs_liberation/issues/1680

game/ato/flight.py

@@ -11,6 +11,7 @@ from .flightstate import FlightState, Uninitialized
 
 if TYPE_CHECKING:
     from game.dcs.aircrafttype import AircraftType
+    from game.sim.gameupdateevents import GameUpdateEvents
     from game.squadrons import Squadron, Pilot
     from game.theater import ControlPoint, MissionTarget
     from game.transfers import TransferOrder
@@ -147,8 +148,10 @@ class Flight:
     def set_state(self, state: FlightState) -> None:
         self.state = state
 
-    def on_game_tick(self, time: datetime, duration: timedelta) -> None:
-        self.state.on_game_tick(time, duration)
+    def on_game_tick(
+        self, events: GameUpdateEvents, time: datetime, duration: timedelta
+    ) -> None:
+        self.state.on_game_tick(events, time, duration)
 
     def should_halt_sim(self) -> bool:
         return self.state.should_halt_sim()

game/ato/flightstate/completed.py

@@ -1,11 +1,19 @@
+from __future__ import annotations
+
 from datetime import datetime, timedelta
+from typing import TYPE_CHECKING
 
 from .flightstate import FlightState
 from ..starttype import StartType
 
+if TYPE_CHECKING:
+    from game.sim.gameupdateevents import GameUpdateEvents
+
 
 class Completed(FlightState):
-    def on_game_tick(self, time: datetime, duration: timedelta) -> None:
+    def on_game_tick(
+        self, events: GameUpdateEvents, time: datetime, duration: timedelta
+    ) -> None:
         return
 
     @property

game/ato/flightstate/flightstate.py

@@ -9,6 +9,7 @@ from game.ato.starttype import StartType
 if TYPE_CHECKING:
     from game.ato.flight import Flight
     from game.settings import Settings
+    from game.sim.gameupdateevents import GameUpdateEvents
     from game.threatzones import ThreatPoly
 
 
@@ -18,7 +19,9 @@ class FlightState(ABC):
         self.settings = settings
 
     @abstractmethod
-    def on_game_tick(self, time: datetime, duration: timedelta) -> None:
+    def on_game_tick(
+        self, events: GameUpdateEvents, time: datetime, duration: timedelta
+    ) -> None:
         ...
 
     @property

game/ato/flightstate/incombat.py

@@ -11,6 +11,7 @@ from ..starttype import StartType
 
 if TYPE_CHECKING:
     from game.sim.combat import FrozenCombat
+    from game.sim.gameupdateevents import GameUpdateEvents
 
 
 class InCombat(InFlight):
@@ -32,7 +33,9 @@ class InCombat(InFlight):
     def estimate_speed(self) -> Speed:
         return self.previous_state.estimate_speed()
 
-    def on_game_tick(self, time: datetime, duration: timedelta) -> None:
+    def on_game_tick(
+        self, events: GameUpdateEvents, time: datetime, duration: timedelta
+    ) -> None:
         raise RuntimeError("Cannot simulate combat")
 
     @property

game/ato/flightstate/inflight.py

@@ -17,6 +17,7 @@ from gen.flights.flightplan import LoiterFlightPlan
 if TYPE_CHECKING:
     from game.ato.flight import Flight
     from game.settings import Settings
+    from game.sim.gameupdateevents import GameUpdateEvents
 
 
 class InFlight(FlightState, ABC):
@@ -88,7 +89,9 @@ class InFlight(FlightState, ABC):
     def advance_to_next_waypoint(self) -> None:
         self.flight.set_state(self.next_waypoint_state())
 
-    def on_game_tick(self, time: datetime, duration: timedelta) -> None:
+    def on_game_tick(
+        self, events: GameUpdateEvents, time: datetime, duration: timedelta
+    ) -> None:
         self.elapsed_time += duration
         if self.elapsed_time > self.total_time_to_next_waypoint:
             self.advance_to_next_waypoint()

game/ato/flightstate/navigating.py

@@ -1,5 +1,6 @@
 from __future__ import annotations
 
+from datetime import datetime, timedelta
 from typing import TYPE_CHECKING
 
 from dcs import Point
@@ -9,7 +10,7 @@ from game.ato.starttype import StartType
 from game.utils import Distance, LBS_TO_KG, Speed, meters
 
 if TYPE_CHECKING:
-    pass
+    from game.sim.gameupdateevents import GameUpdateEvents
 
 
 def lerp(v0: float, v1: float, t: float) -> float:
@@ -17,6 +18,12 @@ def lerp(v0: float, v1: float, t: float) -> float:
 
 
 class Navigating(InFlight):
+    def on_game_tick(
+        self, events: GameUpdateEvents, time: datetime, duration: timedelta
+    ) -> None:
+        super().on_game_tick(events, time, duration)
+        events.update_flight(self.flight)
+
     def progress(self) -> float:
         return (
             self.elapsed_time.total_seconds()

game/ato/flightstate/startup.py

@@ -11,6 +11,7 @@ from ..starttype import StartType
 if TYPE_CHECKING:
     from game.ato.flight import Flight
     from game.settings import Settings
+    from game.sim.gameupdateevents import GameUpdateEvents
 
 
 class StartUp(FlightState):
@@ -18,7 +19,9 @@ class StartUp(FlightState):
         super().__init__(flight, settings)
         self.completion_time = now + flight.flight_plan.estimate_startup()
 
-    def on_game_tick(self, time: datetime, duration: timedelta) -> None:
+    def on_game_tick(
+        self, events: GameUpdateEvents, time: datetime, duration: timedelta
+    ) -> None:
         if time < self.completion_time:
             return
         self.flight.set_state(Taxi(self.flight, self.settings, time))

game/ato/flightstate/takeoff.py

@@ -12,6 +12,7 @@ from ...utils import LBS_TO_KG
 if TYPE_CHECKING:
     from game.ato.flight import Flight
     from game.settings import Settings
+    from game.sim.gameupdateevents import GameUpdateEvents
 
 
 class Takeoff(FlightState):
@@ -20,7 +21,9 @@ class Takeoff(FlightState):
         # TODO: Not accounted for in FlightPlan, can cause discrepancy without loiter.
         self.completion_time = now + timedelta(seconds=30)
 
-    def on_game_tick(self, time: datetime, duration: timedelta) -> None:
+    def on_game_tick(
+        self, events: GameUpdateEvents, time: datetime, duration: timedelta
+    ) -> None:
         if time < self.completion_time:
             return
         self.flight.set_state(Navigating(self.flight, self.settings, waypoint_index=0))

game/ato/flightstate/taxi.py

@@ -11,6 +11,7 @@ from ..starttype import StartType
 if TYPE_CHECKING:
     from game.ato.flight import Flight
     from game.settings import Settings
+    from game.sim.gameupdateevents import GameUpdateEvents
 
 
 class Taxi(FlightState):
@@ -18,7 +19,9 @@ class Taxi(FlightState):
         super().__init__(flight, settings)
         self.completion_time = now + flight.flight_plan.estimate_ground_ops()
 
-    def on_game_tick(self, time: datetime, duration: timedelta) -> None:
+    def on_game_tick(
+        self, events: GameUpdateEvents, time: datetime, duration: timedelta
+    ) -> None:
         if time < self.completion_time:
             return
         self.flight.set_state(Takeoff(self.flight, self.settings, time))

game/ato/flightstate/uninitialized.py

@@ -1,12 +1,20 @@
+from __future__ import annotations
+
 from datetime import datetime, timedelta
+from typing import TYPE_CHECKING
 
 from gen.flights.traveltime import TotEstimator
 from .flightstate import FlightState
 from ..starttype import StartType
 
+if TYPE_CHECKING:
+    from game.sim.gameupdateevents import GameUpdateEvents
+
 
 class Uninitialized(FlightState):
-    def on_game_tick(self, time: datetime, duration: timedelta) -> None:
+    def on_game_tick(
+        self, events: GameUpdateEvents, time: datetime, duration: timedelta
+    ) -> None:
         raise RuntimeError("Attempted to simulate flight that is not fully initialized")
 
     @property

game/ato/flightstate/waitingforstart.py

@@ -13,6 +13,7 @@ from .taxi import Taxi
 if TYPE_CHECKING:
     from game.ato.flight import Flight
     from game.settings import Settings
+    from game.sim.gameupdateevents import GameUpdateEvents
 
 
 class WaitingForStart(FlightState):
@@ -29,7 +30,9 @@ class WaitingForStart(FlightState):
     def start_type(self) -> StartType:
         return self.flight.start_type
 
-    def on_game_tick(self, time: datetime, duration: timedelta) -> None:
+    def on_game_tick(
+        self, events: GameUpdateEvents, time: datetime, duration: timedelta
+    ) -> None:
         if time < self.start_time:
             return
 

game/sim/aircraftsimulation.py

@@ -18,35 +18,36 @@ from game.ato.flightstate import (
 from game.ato.starttype import StartType
 from gen.flights.traveltime import TotEstimator
 from .combat import CombatInitiator, FrozenCombat
-from .gameupdatecallbacks import GameUpdateCallbacks
 
 if TYPE_CHECKING:
     from game import Game
+    from .gameupdateevents import GameUpdateEvents
 
 
 class AircraftSimulation:
-    def __init__(self, game: Game, callbacks: GameUpdateCallbacks) -> None:
+    def __init__(self, game: Game) -> None:
         self.game = game
-        self.callbacks = callbacks
         self.combats: list[FrozenCombat] = []
 
     def begin_simulation(self) -> None:
         self.reset()
         self.set_initial_flight_states()
 
-    def on_game_tick(self, time: datetime, duration: timedelta) -> bool:
+    def on_game_tick(
+        self, events: GameUpdateEvents, time: datetime, duration: timedelta
+    ) -> None:
         for flight in self.iter_flights():
-            flight.on_game_tick(time, duration)
+            flight.on_game_tick(events, time, duration)
 
         # Finish updating all flights before checking for combat so that the new
         # positions are used.
-        CombatInitiator(self.game, self.combats, self.callbacks).update_active_combats()
+        CombatInitiator(self.game, self.combats, events).update_active_combats()
 
         # After updating all combat states, check for halts.
         for flight in self.iter_flights():
             if flight.should_halt_sim():
-                return True
-        return False
+                events.complete_simulation()
+                return
 
     def set_initial_flight_states(self) -> None:
         now = self.game.conditions.start_time

game/sim/combat/combatinitiator.py

@@ -12,7 +12,7 @@ from .atip import AtIp
 from .defendingsam import DefendingSam
 from .joinablecombat import JoinableCombat
 from .samengagementzones import SamEngagementZones
-from ..gameupdatecallbacks import GameUpdateCallbacks
+from ..gameupdateevents import GameUpdateEvents
 
 if TYPE_CHECKING:
     from game import Game
@@ -22,11 +22,11 @@ if TYPE_CHECKING:
 
 class CombatInitiator:
     def __init__(
-        self, game: Game, combats: list[FrozenCombat], callbacks: GameUpdateCallbacks
+        self, game: Game, combats: list[FrozenCombat], events: GameUpdateEvents
     ) -> None:
         self.game = game
         self.combats = combats
-        self.callbacks = callbacks
+        self.events = events
 
     def update_active_combats(self) -> None:
         blue_a2a = AircraftEngagementZones.from_ato(self.game.blue.ato)
@@ -64,7 +64,7 @@ class CombatInitiator:
             logging.info(f"{flight} is joining existing combat {joined}")
             joined.join(flight)
             own_a2a.remove_flight(flight)
-            self.callbacks.on_combat_changed(joined)
+            self.events.update_combat(joined)
         elif (combat := self.check_flight_for_new_combat(flight, a2a, sam)) is not None:
             logging.info(f"Interrupting simulation because {combat.because()}")
             combat.update_flight_states()
@@ -75,7 +75,7 @@ class CombatInitiator:
             a2a.update_for_combat(combat)
             own_a2a.update_for_combat(combat)
             self.combats.append(combat)
-            self.callbacks.on_add_combat(combat)
+            self.events.new_combat(combat)
 
     def check_flight_for_joined_combat(
         self, flight: Flight

game/sim/gameloop.py

@@ -7,6 +7,7 @@ from typing import TYPE_CHECKING
 
 from .gamelooptimer import GameLoopTimer
 from .gameupdatecallbacks import GameUpdateCallbacks
+from .gameupdateevents import GameUpdateEvents
 from .missionsimulation import MissionSimulation, SimulationAlreadyCompletedError
 from .simspeedsetting import SimSpeedSetting
 
@@ -20,7 +21,9 @@ class GameLoop:
         self.game = game
         self.callbacks = callbacks
         self.timer = GameLoopTimer(self.tick)
-        self.sim = MissionSimulation(self.game, self.callbacks)
+        self.sim = MissionSimulation(self.game)
+        self.events = GameUpdateEvents()
+        self.last_update_time = datetime.now()
         self.started = False
         self.completed = False
 
@@ -53,7 +56,7 @@ class GameLoop:
         self.pause()
         logging.info("Running sim to first contact")
         while not self.completed:
-            self.tick()
+            self.tick(suppress_events=True)
 
     def pause_and_generate_miz(self, output: Path) -> None:
         self.pause()
@@ -68,13 +71,25 @@ class GameLoop:
         self.sim.process_results(debriefing)
         self.completed = True
 
-    def tick(self) -> None:
+    def send_update(self, rate_limit: bool) -> None:
+        now = datetime.now()
+        time_since_update = now - self.last_update_time
+        if not rate_limit or time_since_update >= timedelta(seconds=1 / 60):
+            self.callbacks.on_update(self.events)
+            self.events = GameUpdateEvents()
+            self.last_update_time = now
+
+    def tick(self, suppress_events: bool = False) -> None:
         if not self.started:
             raise RuntimeError("Attempted to tick game loop before initialization")
         try:
-            self.completed = self.sim.tick()
+            self.sim.tick(self.events)
+            self.completed = self.events.simulation_complete
+            if not suppress_events:
+                self.send_update(rate_limit=True)
             if self.completed:
                 self.pause()
+                self.send_update(rate_limit=False)
                 logging.info(f"Simulation completed at {self.sim.time}")
                 self.callbacks.on_simulation_complete()
         except SimulationAlreadyCompletedError:

game/sim/gameupdatecallbacks.py

@@ -2,10 +2,8 @@ from __future__ import annotations
 
 from collections.abc import Callable
 from dataclasses import dataclass
-from typing import TYPE_CHECKING
 
-if TYPE_CHECKING:
-    from game.sim.combat import FrozenCombat
+from game.sim.gameupdateevents import GameUpdateEvents
 
 
 # Ought to be frozen but mypy can't handle that:
@@ -13,5 +11,4 @@ if TYPE_CHECKING:
 @dataclass
 class GameUpdateCallbacks:
     on_simulation_complete: Callable[[], None]
-    on_add_combat: Callable[[FrozenCombat], None]
-    on_combat_changed: Callable[[FrozenCombat], None]
+    on_update: Callable[[GameUpdateEvents], None]

game/sim/gameupdateevents.py

@@ -0,0 +1,27 @@
+from __future__ import annotations
+
+from typing import TYPE_CHECKING
+
+if TYPE_CHECKING:
+    from game.ato import Flight
+    from game.sim.combat import FrozenCombat
+
+
+class GameUpdateEvents:
+    def __init__(self) -> None:
+        self.simulation_complete = False
+        self.new_combats: list[FrozenCombat] = []
+        self.updated_combats: list[FrozenCombat] = []
+        self.updated_flights: list[Flight] = []
+
+    def complete_simulation(self) -> None:
+        self.simulation_complete = True
+
+    def new_combat(self, combat: FrozenCombat) -> None:
+        self.new_combats.append(combat)
+
+    def update_combat(self, combat: FrozenCombat) -> None:
+        self.updated_combats.append(combat)
+
+    def update_flight(self, flight: Flight) -> None:
+        self.updated_flights.append(flight)

game/sim/missionsimulation.py

@@ -9,11 +9,11 @@ from game.debriefing import Debriefing
 from game.missiongenerator import MissionGenerator
 from game.unitmap import UnitMap
 from .aircraftsimulation import AircraftSimulation
-from .gameupdatecallbacks import GameUpdateCallbacks
 from .missionresultsprocessor import MissionResultsProcessor
 
 if TYPE_CHECKING:
     from game import Game
+    from .gameupdateevents import GameUpdateEvents
 
 
 TICK = timedelta(seconds=1)
@@ -25,10 +25,10 @@ class SimulationAlreadyCompletedError(RuntimeError):
 
 
 class MissionSimulation:
-    def __init__(self, game: Game, callbacks: GameUpdateCallbacks) -> None:
+    def __init__(self, game: Game) -> None:
         self.game = game
         self.unit_map: Optional[UnitMap] = None
-        self.aircraft_simulation = AircraftSimulation(self.game, callbacks)
+        self.aircraft_simulation = AircraftSimulation(self.game)
         self.completed = False
         self.time = self.game.conditions.start_time
 
@@ -36,12 +36,13 @@ class MissionSimulation:
         self.time = self.game.conditions.start_time
         self.aircraft_simulation.begin_simulation()
 
-    def tick(self) -> bool:
+    def tick(self, events: GameUpdateEvents) -> GameUpdateEvents:
         self.time += TICK
         if self.completed:
             raise RuntimeError("Simulation already completed")
-        self.completed = self.aircraft_simulation.on_game_tick(self.time, TICK)
-        return self.completed
+        self.aircraft_simulation.on_game_tick(events, self.time, TICK)
+        self.completed = events.simulation_complete
+        return events
 
     def generate_miz(self, output: Path) -> None:
         self.unit_map = MissionGenerator(self.game, self.time).generate_miz(output)

qt_ui/models.py

@@ -17,6 +17,7 @@ from game.ato.flight import Flight
 from game.ato.flighttype import FlightType
 from game.ato.package import Package
 from game.game import Game
+from game.sim.gameupdateevents import GameUpdateEvents
 from game.squadrons.squadron import Pilot, Squadron
 from game.theater.missiontarget import MissionTarget
 from game.transfers import PendingTransfers, TransferOrder
@@ -211,7 +212,7 @@ class PackageModel(QAbstractListModel):
         for flight in self.package.flights:
             yield flight
 
-    def on_sim_update(self) -> None:
+    def on_sim_update(self, _events: GameUpdateEvents) -> None:
         self.dataChanged.emit(self.index(0), self.index(self.rowCount()))
 
 
@@ -311,7 +312,7 @@ class AtoModel(QAbstractListModel):
         for package in self.ato.packages:
             yield self.package_models.acquire(package)
 
-    def on_sim_update(self) -> None:
+    def on_sim_update(self, _events: GameUpdateEvents) -> None:
         self.dataChanged.emit(self.index(0), self.index(self.rowCount()))
 
 

qt_ui/simcontroller.py

@@ -8,11 +8,10 @@ from typing import Callable, Optional, TYPE_CHECKING
 from PySide2.QtCore import QObject, Signal
 
 from game.polldebriefingfilethread import PollDebriefingFileThread
-from game.sim.combat import FrozenCombat
 from game.sim.gameloop import GameLoop
 from game.sim.gameupdatecallbacks import GameUpdateCallbacks
+from game.sim.gameupdateevents import GameUpdateEvents
 from game.sim.simspeedsetting import SimSpeedSetting
-from qt_ui.simupdatethread import SimUpdateThread
 
 if TYPE_CHECKING:
     from game import Game
@@ -20,19 +19,15 @@ if TYPE_CHECKING:
 
 
 class SimController(QObject):
-    sim_update = Signal()
+    sim_update = Signal(GameUpdateEvents)
     sim_speed_reset = Signal(SimSpeedSetting)
     simulation_complete = Signal()
-    on_add_combat = Signal(FrozenCombat)
-    on_combat_changed = Signal(FrozenCombat)
 
     def __init__(self, game: Optional[Game]) -> None:
         super().__init__()
         self.game_loop: Optional[GameLoop] = None
         self.recreate_game_loop(game)
         self.started = False
-        self._sim_update_thread = SimUpdateThread(self.sim_update.emit)
-        self._sim_update_thread.start()
 
     @property
     def completed(self) -> bool:
@@ -54,12 +49,8 @@ class SimController(QObject):
         self.recreate_game_loop(game)
         self.sim_speed_reset.emit(SimSpeedSetting.PAUSED)
 
-    def shut_down(self) -> None:
-        self._sim_update_thread.stop()
-
     def recreate_game_loop(self, game: Optional[Game]) -> None:
         if self.game_loop is not None:
-            self._sim_update_thread.on_sim_pause()
             self.game_loop.pause()
         self.game_loop = None
         if game is not None:
@@ -67,8 +58,7 @@ class SimController(QObject):
                 game,
                 GameUpdateCallbacks(
                     self.on_simulation_complete,
-                    self.on_add_combat.emit,
-                    self.on_combat_changed.emit,
+                    self.sim_update.emit,
                 ),
             )
         self.started = False
@@ -81,17 +71,11 @@ class SimController(QObject):
             self.game_loop.start()
             self.started = True
         self.game_loop.set_simulation_speed(simulation_speed)
-        if simulation_speed is SimSpeedSetting.PAUSED:
-            self._sim_update_thread.on_sim_pause()
-        else:
-            self._sim_update_thread.on_sim_unpause()
 
     def run_to_first_contact(self) -> None:
         self.game_loop.run_to_first_contact()
-        self.sim_update.emit()
 
     def generate_miz(self, output: Path) -> None:
-        self._sim_update_thread.on_sim_pause()
         self.game_loop.pause_and_generate_miz(output)
 
     def wait_for_debriefing(
@@ -104,14 +88,11 @@ class SimController(QObject):
     def debrief_current_state(
         self, state_path: Path, force_end: bool = False
     ) -> Debriefing:
-        self._sim_update_thread.on_sim_pause()
         return self.game_loop.pause_and_debrief(state_path, force_end)
 
     def process_results(self, debriefing: Debriefing) -> None:
-        self._sim_update_thread.on_sim_pause()
         return self.game_loop.complete_with_results(debriefing)
 
     def on_simulation_complete(self) -> None:
         logging.debug("Simulation complete")
-        self._sim_update_thread.on_sim_pause()
         self.simulation_complete.emit()

qt_ui/simupdatethread.py

@@ -1,45 +0,0 @@
-from threading import Event, Thread, Timer
-from typing import Callable
-
-
-class SimUpdateThread(Thread):
-    def __init__(self, update_callback: Callable[[], None]) -> None:
-        super().__init__()
-        self.update_callback = update_callback
-        self.running = False
-        self.should_shutdown = False
-        self._interrupt = Event()
-        self._timer = self._make_timer()
-
-    def run(self) -> None:
-        while True:
-            self._interrupt.wait()
-            self._interrupt.clear()
-            if self.should_shutdown:
-                return
-            if self.running:
-                self.update_callback()
-            self._timer = self._make_timer()
-            self._timer.start()
-
-    def on_sim_pause(self) -> None:
-        self._timer.cancel()
-        self._timer = self._make_timer()
-        self.running = False
-
-    def on_sim_unpause(self) -> None:
-        if not self.running:
-            self.running = True
-            self._timer.start()
-
-    def stop(self) -> None:
-        self.should_shutdown = True
-        self._interrupt.set()
-
-    def on_timer_elapsed(self) -> None:
-        self._timer = self._make_timer()
-        self._timer.start()
-        self._interrupt.set()
-
-    def _make_timer(self) -> Timer:
-        return Timer(1 / 60, lambda: self._interrupt.set())

qt_ui/widgets/QConditionsWidget.py

@@ -12,6 +12,7 @@ from PySide2.QtWidgets import (
 from dcs.weather import CloudPreset, Weather as PydcsWeather
 
 import qt_ui.uiconstants as CONST
+from game.sim.gameupdateevents import GameUpdateEvents
 from game.utils import mps
 from game.weather import Conditions, TimeOfDay
 from qt_ui.simcontroller import SimController
@@ -55,7 +56,7 @@ class QTimeTurnWidget(QGroupBox):
 
         sim_controller.sim_update.connect(self.on_sim_update)
 
-    def on_sim_update(self) -> None:
+    def on_sim_update(self, _events: GameUpdateEvents) -> None:
         time = self.sim_controller.current_time_in_sim
         if time is None:
             self.date_display.setText("")

qt_ui/widgets/map/model/mapmodel.py

@@ -13,6 +13,7 @@ from game.sim.combat import FrozenCombat
 from game.sim.combat.aircombat import AirCombat
 from game.sim.combat.atip import AtIp
 from game.sim.combat.defendingsam import DefendingSam
+from game.sim.gameupdateevents import GameUpdateEvents
 from game.theater import (
     ConflictTheater,
 )
@@ -106,8 +107,6 @@ class MapModel(QObject):
             self.set_flight_selection
         )
         sim_controller.sim_update.connect(self.on_sim_update)
-        sim_controller.on_add_combat.connect(self.on_add_combat)
-        sim_controller.on_combat_changed.connect(self.on_combat_changed)
         self.reset()
 
     def clear(self) -> None:
@@ -128,9 +127,17 @@ class MapModel(QObject):
         self._ip_combats = []
         self.cleared.emit()
 
-    def on_sim_update(self) -> None:
+    def on_sim_update(self, events: GameUpdateEvents) -> None:
+        # TODO: Only update flights with changes.
+        # We have the signal of which flights have updates, but no fast lookup for
+        # Flight -> FlightJs since Flight isn't hashable. Faster to update every flight
+        # than do do the O(n^2) filtered update.
         for flight in self._flights.values():
             flight.positionChanged.emit()
+        for combat in events.new_combats:
+            self.on_add_combat(combat)
+        for combat in events.updated_combats:
+            self.on_combat_changed(combat)
 
     def set_package_selection(self, index: int) -> None:
         self.deselect_current_flight()

qt_ui/windows/QLiberationWindow.py

@@ -404,7 +404,6 @@ class QLiberationWindow(QMainWindow):
             QMessageBox.Yes | QMessageBox.No,
         )
         if result == QMessageBox.Yes:
-            self.sim_controller.shut_down()
             super().closeEvent(event)
             self.dialog = None
         else: