/// <summary>
/// This is the thread that will cause the car to move forward forever
/// until it finishes its trip or crashes.
/// </summary>
/// <param name="ThreadParameter">Any parameter that the thread needs</param>
protected void Go(object ThreadParameter)
{
if (ThreadParameter is Wind windy)
{
string ThreadTypeInfo = "";
switch (windy.Model)
{
case ThreadingModel.ManualThreads:
{
ThreadTypeInfo = $"Using new ParameterizedThreadStart thread {Thread.CurrentThread.ManagedThreadId}.";
}
break;
case ThreadingModel.ThreadPoolThreads:
{
ThreadTypeInfo = $"Using ThreadPool thread {Thread.CurrentThread.ManagedThreadId}.";
}
break;
case ThreadingModel.TaskThreads:
{
ThreadTypeInfo = $"Using TaskThreads thread {Thread.CurrentThread.ManagedThreadId}.";
}
break;
}
Console.WriteLine($"Started to drive car {CarId}, travelling in the {Direction.ToString()} direction, enter intersection every {MilesTillIntersection} miles.\r\nThe wind is coming out of the {windy.WindDirection.ToString()} at {windy.Speed} MPH.{ThreadTypeInfo}");
}
// Signal that this thread has started. We don't want to let
// the cars start the race until ALL cars have started their
// thread and are ready to go.
CarIsReadyToGo.Set();
// If the caller wants ALL cars to start at the same time
// then all threads will block on the ManualResetEvent.
// When "Set" is called, ALL threads/cars will start/unblock
// at the same time
StartAllCars.WaitOne();
while ((MilesTravelled < MilesLengthOfTrip) && !CarCrashed)
{
MoveOneStep();
}
if (CarCrashed)
{
Console.WriteLine($"Vehicle {CarId} CRASHED in the intersection after {MilesTravelled} miles of a {MilesLengthOfTrip} mile trip");
}
else
{
Console.WriteLine($"Vehicle {CarId} successfully completed the {MilesLengthOfTrip} mile trip");
// Create BOGUS event to have this car removed from list of all cars
// because it has completed the trip.
TripCompleted = true;
CarEnteredOrExitedIntersectionEvent?.Invoke(this);
}
}
/// <summary>
/// Move the car forward one step and tell event listener when the car entered or exited the intersection
/// </summary>
protected void MoveOneStep()
{
++MilesTravelled;
Thread.Sleep(MovementSleep);
// Check if this car needs a pit stop
if ((MilesTravelled % MilesTillPitStop) == 0)
{
// Try to enter pit area. If there is a spot available
// then the car can enter, otherwise it MUST wait for
// one of the cars already in the pit area to get out.
PitStop.WaitOne();
// Count the number of times the car has entered the pit area during the race.
++NumberOfPitStopMade;
// Spend some time in the pit area
Thread.Sleep(MovementSleep);
// Leave the pit area to allow other cars to enter
PitStop.Release();
}
// Check if we are in intersection
if ((MilesTravelled % MilesTillIntersection) == 0)
{
// Wait at stop sign before entering the intersection
if (WaitAtStopSign)
{
StopSign.WaitOne();
}
InIntersection = true;
// Indiate this car entered the intersection
CarEnteredOrExitedIntersectionEvent?.Invoke(this);
// If the car crashed, then it was already removed from the intersection
if (!CarCrashed)
{
// Car spends some time in the intersection
Thread.Sleep(MovementSleep);
InIntersection = false;
// Indiate this car left the intersection
CarEnteredOrExitedIntersectionEvent?.Invoke(this);
}
// Tell any other car waiting at the stop sign
// that we exited the intersection and it's ok for them
// to enter.
if (WaitAtStopSign)
{
StopSign.Set();
}
}
}