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Deal with a race condition. #312
1) A car tries to spawn, but fails because there's something in the way 2) The player makes live edits 3) The retry occurs, but the path has become invalid due to edits Need to make the detection of this more efficient later.
This commit is contained in:
Dustin Carlino
parent
e55dfd68dd
commit
50c9c3236d
@ -435,79 +435,114 @@ impl Sim {
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self.trips.start_trip(self.time, id, trip_spec, &mut ctx);
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}
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Command::SpawnCar(create_car, retry_if_no_room) => {
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// create_car contains a Path, which is expensive to clone. We need different parts
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// of create_car after attempting start_car_on_lane. Make copies just of those
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// here. In no case do we ever clone the path.
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let id = create_car.vehicle.id;
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let maybe_route = create_car.maybe_route;
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let trip_and_person = create_car.trip_and_person;
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let maybe_parked_car = create_car.maybe_parked_car.clone();
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let req = create_car.req.clone();
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if let Some(create_car) = self.driving.start_car_on_lane(
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self.time,
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create_car,
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map,
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&self.intersections,
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&self.parking,
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&mut self.scheduler,
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) {
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// Starting the car failed for some reason.
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if retry_if_no_room {
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// TODO Record this in the trip log
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self.scheduler.push(
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self.time + BLIND_RETRY_TO_SPAWN,
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Command::SpawnCar(create_car, retry_if_no_room),
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);
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} else {
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// Buses don't use Command::SpawnCar, so this must exist.
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let (trip, person) = create_car.trip_and_person.unwrap();
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// Have to redeclare for the borrow checker
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let mut ctx = Ctx {
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parking: &mut self.parking,
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intersections: &mut self.intersections,
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cap: &mut self.cap,
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scheduler: &mut self.scheduler,
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map,
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};
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self.trips.cancel_trip(
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self.time,
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trip,
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format!(
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"no room to spawn car for {} by {}, not retrying",
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trip, person
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),
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Some(create_car.vehicle),
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&mut ctx,
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);
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}
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} else {
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// Creating the car succeeded.
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if let Some((trip, person)) = trip_and_person {
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self.trips.agent_starting_trip_leg(AgentID::Car(id), trip);
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events.push(Event::TripPhaseStarting(
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trip,
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person,
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Some(req),
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if id.1 == VehicleType::Car {
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TripPhaseType::Driving
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} else {
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TripPhaseType::Biking
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},
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));
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}
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if let Some(parked_car) = maybe_parked_car {
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if let ParkingSpot::Offstreet(b, _) = parked_car.spot {
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// Buses don't start in parking garages, so trip must exist
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events.push(Event::PersonLeavesBuilding(trip_and_person.unwrap().1, b));
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// If this SpawnCar is being retried and the map was live-edited since the first
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// attempt, the path might've become invalid. TODO Skip this check
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// most of the time.
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let constraints = create_car.vehicle.vehicle_type.to_constraints();
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let mut ok = true;
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for step in create_car.router.get_path().get_steps() {
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match step.as_traversable() {
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Traversable::Lane(l) => {
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if !constraints.can_use(ctx.map.get_l(l), ctx.map) {
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ok = false;
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break;
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}
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}
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Traversable::Turn(t) => {
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if ctx.map.maybe_get_t(t).is_none() {
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ok = false;
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break;
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}
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}
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self.parking.remove_parked_car(parked_car);
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}
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if let Some(route) = maybe_route {
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self.transit.bus_created(id, route);
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}
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if !ok {
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self.trips.cancel_trip(
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self.time,
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create_car.trip_and_person.unwrap().0,
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"path is no longer valid after map edits".to_string(),
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Some(create_car.vehicle),
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&mut ctx,
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);
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} else {
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// create_car contains a Path, which is expensive to clone. We need different
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// parts of create_car after attempting start_car_on_lane.
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// Make copies just of those here. In no case do we ever
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// clone the path.
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let id = create_car.vehicle.id;
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let maybe_route = create_car.maybe_route;
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let trip_and_person = create_car.trip_and_person;
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let maybe_parked_car = create_car.maybe_parked_car.clone();
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let req = create_car.req.clone();
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if let Some(create_car) = self.driving.start_car_on_lane(
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self.time,
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create_car,
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map,
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&self.intersections,
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&self.parking,
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&mut self.scheduler,
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) {
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// Starting the car failed for some reason.
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if retry_if_no_room {
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// TODO Record this in the trip log
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self.scheduler.push(
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self.time + BLIND_RETRY_TO_SPAWN,
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Command::SpawnCar(create_car, retry_if_no_room),
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);
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} else {
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// Buses don't use Command::SpawnCar, so this must exist.
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let (trip, person) = create_car.trip_and_person.unwrap();
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// Have to redeclare for the borrow checker
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let mut ctx = Ctx {
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parking: &mut self.parking,
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intersections: &mut self.intersections,
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cap: &mut self.cap,
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scheduler: &mut self.scheduler,
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map,
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};
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self.trips.cancel_trip(
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self.time,
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trip,
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format!(
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"no room to spawn car for {} by {}, not retrying",
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trip, person
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),
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Some(create_car.vehicle),
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&mut ctx,
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);
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}
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} else {
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// Creating the car succeeded.
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if let Some((trip, person)) = trip_and_person {
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self.trips.agent_starting_trip_leg(AgentID::Car(id), trip);
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events.push(Event::TripPhaseStarting(
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trip,
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person,
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Some(req),
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if id.1 == VehicleType::Car {
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TripPhaseType::Driving
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} else {
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TripPhaseType::Biking
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},
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));
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}
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if let Some(parked_car) = maybe_parked_car {
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if let ParkingSpot::Offstreet(b, _) = parked_car.spot {
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// Buses don't start in parking garages, so trip must exist
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events.push(Event::PersonLeavesBuilding(
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trip_and_person.unwrap().1,
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b,
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));
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}
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self.parking.remove_parked_car(parked_car);
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}
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if let Some(route) = maybe_route {
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self.transit.bus_created(id, route);
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}
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self.analytics
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.record_demand(self.driving.get_path(id).unwrap(), map);
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}
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self.analytics
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.record_demand(self.driving.get_path(id).unwrap(), map);
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}
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}
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Command::SpawnPed(create_ped) => {
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