public LocationEvent(Skier skier, DateTimeOffset time)
{
SkierId = skier.Id;
Latitude = skier.Location.Latitude;
Longitude = skier.Location.Longitude;
EventTime = time;
}
private void LoadUnloadSkiers(SimulatedChairlift lift, long currentTime)
{
for (int i = 0; i < lift.ChairLift.PassengerCount && lift.SkiersWaiting.Count > 0; i++)
{
Skier skier = lift.SkiersWaiting.Dequeue();
skier.StartTimeForCurrentStage = currentTime;
skier.Location = lift.ChairLift.Top; // TODO: interpolate location between bottom and top
Debug.Assert(!lift.SkiersRiding.Contains(skier));
lift.SkiersRiding.Enqueue(skier);
}
for (int i = 0; i < lift.ChairLift.PassengerCount && lift.SkiersRiding.Count > 0; i++)
{
Skier skier = lift.SkiersRiding.Peek();
if (currentTime - skier.StartTimeForCurrentStage >= lift.ChairLift.TimeToTop)
{
skier = lift.SkiersRiding.Dequeue();
skier.StartTimeForCurrentStage = currentTime;
skier.Location = lift.ChairLift.Top;
// TODO: randomize new chairlift target
Debug.Assert(!lift.SkiersSkiingToThisLift.Contains(skier));
lift.SkiersSkiingToThisLift.Add(skier);
}
Debug.Assert(lift.SkiersRiding.Contains(skier) ^ lift.SkiersSkiingToThisLift.Contains(skier));
}
lift.LastLoadTime = currentTime;
}
private void ReportOut(long currentTime, List <SimulatedChairlift> simulatedLifts, Skier reference, Stopwatch watch)
{
Console.WriteLine($"------------{currentTime}");
string ridingLift = simulatedLifts.SingleOrDefault(l => l.SkiersRiding.Contains(reference))?.ChairLift.Name ?? "<none>";
string waitingLift = simulatedLifts.SingleOrDefault(l => l.SkiersWaiting.Contains(reference))?.ChairLift.Name ?? "<none>";
string skiiingToLift = simulatedLifts.SingleOrDefault(l => l.SkiersSkiingToThisLift.Contains(reference))?.ChairLift.Name ?? "<none>";
if (ridingLift != "<none>" && waitingLift != "<none>" ||
ridingLift != "<none>" && skiiingToLift != "<none>" ||
waitingLift != "<none>" && skiiingToLift != "<none>")
{
Debug.Assert(false);
}
Console.WriteLine($"{reference.Id}\t{reference.Location.Latitude}\t{waitingLift}\t{ridingLift}\t{skiiingToLift}\t{watch.ElapsedMilliseconds}");
string line = "waiting";
foreach (var lift in simulatedLifts)
{
line += $"\t{lift.SkiersWaiting.Count}";
}
Console.WriteLine(line);
line = "riding";
foreach (var lift in simulatedLifts)
{
line += $"\t{lift.SkiersRiding.Count}";
}
Console.WriteLine(line);
}
public void Start()
{
Random random = new Random();
List <SimulatedChairlift> simulatedLifts = Lifts.Select(l => new SimulatedChairlift(l)).ToList();
// TODO: add new skiers gradually
List <Skier> skiers = new List <Skier>(_skierCount);
for (int i = 0; i < _skierCount; i++)
{
// TODO: skew towards easier runs
int lift = random.Next(0, Lifts.Length);
Skier skier = new Skier {
Location = simulatedLifts[lift].ChairLift.Bottom
};
simulatedLifts[lift].SkiersWaiting.Enqueue(skier);
skiers.Add(skier);
}
Skier reference = simulatedLifts[0].SkiersWaiting.Peek();
long currentTime = 0;
Stopwatch watch = new Stopwatch();
while (true)
{
watch.Restart();
foreach (SimulatedChairlift lift in simulatedLifts)
{
if (currentTime - lift.LastLoadTime >= lift.ChairLift.TimeBetweenLoads)
{
LoadUnloadSkiers(lift, currentTime);
}
// TODO: variability in time-to-bottom
Func <Skier, bool> doneWithRunPredicate = s => currentTime - s.StartTimeForCurrentStage >= lift.ChairLift.AverageTimeDown;
MoveSkiersToWaiting(currentTime, lift, doneWithRunPredicate);
}
currentTime++;
watch.Stop();
if (watch.Elapsed < _oneSecond)
{
Thread.Sleep(_oneSecond - watch.Elapsed);
}
if (currentTime % _reportPeriod == 0)
{
// Create a real timeline for events by assuming the simulation starts at 8 AM and goes on in real time
DateTimeOffset now = DateTimeOffset.Now;
DateTimeOffset eventTime = new DateTimeOffset(now.Year, now.Month, now.Day, 8, 0, 0, now.Offset);
eventTime = eventTime.Add(TimeSpan.FromSeconds(currentTime));
// Create a copy of the list and of the data since we'll send this in the background and want
// a stable view of the state of the simulation
SendLocationEvents(skiers.Select(s => new LocationEvent(s, eventTime)).ToList());
}
if (currentTime % 4 == 0)
{
ReportOut(currentTime, simulatedLifts, reference, watch);
}
CheckInput(currentTime, simulatedLifts);
}
}
