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Program.cs
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Program.cs
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using System;
using System.Collections.Generic;
using System.Linq;
using System.Reactive.Linq;
namespace VehicleEventHandling
{
public class Program
{
public static event EventHandler<FieldEventArgs<Journey, Vehicle>> CurrentVehicleChanged;
static void Main(string[] args)
{
var journey = new Journey("J1");
var journey2 = new Journey("J2");
var vehicle1 = new Vehicle { Name = "V1" };
var vehicle2 = new Vehicle { Name = "V2" };
var handler = new VehicleHandler();
//TODO: ---- Replace this:
handler.Start();
CurrentVehicleChanged += handler.OnJourneyCurrentVehicleChanged;
// ----
/* output:
J1 CurrentVehicleChanged from null to V1
J2 CurrentVehicleChanged from null to V2
Handling vehicle: V1 assigned to journey: J1
Handling vehicle: V2 assigned to journey: J2
Handling vehicle: V1 assigned to journey: J1
Handling vehicle: V2 assigned to journey: J2
Handling vehicle: V1 assigned to journey: J1
Handling vehicle: V2 assigned to journey: J2
J1 CurrentVehicleChanged from V1 to null <--- J1 doesn't have vehicle assigned and is not handled for next 3 seconds
Handling vehicle: V2 assigned to journey: J2
Handling vehicle: V2 assigned to journey: J2
Handling vehicle: V2 assigned to journey: J2
J1 CurrentVehicleChanged from null to V2
J2 CurrentVehicleChanged from V2 to V1
Handling vehicle: V1 assigned to journey: J2
Handling vehicle: V2 assigned to journey: J1
Handling vehicle: V1 assigned to journey: J2
Handling vehicle: V2 assigned to journey: J1
Handling vehicle: V1 assigned to journey: J2
Handling vehicle: V2 assigned to journey: J1
J1 CurrentVehicleChanged from V2 to null <--- J1 doesn't have vehicle assigned and is not handled anymore
Handling vehicle: V1 assigned to journey: J2
Handling vehicle: V1 assigned to journey: J2
Handling vehicle: V1 assigned to journey: J2
Handling vehicle: V1 assigned to journey: J2
...
*/
//TODO: ---- with this, problem is that this don't stop the observable.interval when the journey.ChangeVehicle(null);"
//var observable = Observable.FromEventPattern<FieldEventArgs<Journey, Vehicle>>(
// h => CurrentVehicleChanged += h,
// h => CurrentVehicleChanged -= h)
// .Do(x => Console.WriteLine($"{x.EventArgs.Item.Name} CurrentVehicleChanged from {x.EventArgs.LastValue?.Name ?? "null"} to {x.EventArgs.Value?.Name ?? "null"}"))
// .Select(x => x.EventArgs.Item)
// .Where(VehicleHandler.Validate)
// .Select(x => x.CurrentVehicle)
// .Distinct()
// .SelectMany(x => Observable.Interval(TimeSpan.FromSeconds(2)).Select(_ => x))
// .Subscribe(x => Console.WriteLine($"Handling vehicle: {x.Name} assigned to journey: {x.CurrentJourneyName}"));
// ----
/* output:
J1 CurrentVehicleChanged from null to V1
J2 CurrentVehicleChanged from null to V2
Handling vehicle: V1 assigned to journey: J1
Handling vehicle: V2 assigned to journey: J2
Handling vehicle: V1 assigned to journey: J1
Handling vehicle: V2 assigned to journey: J2
J1 CurrentVehicleChanged from V1 to null
Handling vehicle: V2 assigned to journey: J2
Handling vehicle: V1 assigned to journey: J1 <-- still handled after J1.CurrentVehicle set to null
Handling vehicle: V1 assigned to journey: J1
Handling vehicle: V2 assigned to journey: J2
Handling vehicle: V2 assigned to journey: J2
Handling vehicle: V1 assigned to journey: J1
J1 CurrentVehicleChanged from null to V2
Handling vehicle: V2 assigned to journey: J1
J2 CurrentVehicleChanged from V2 to V1
Handling vehicle: V1 assigned to journey: J2
Handling vehicle: V1 assigned to journey: J2
Handling vehicle: V2 assigned to journey: J1
Handling vehicle: V1 assigned to journey: J2
Handling vehicle: V2 assigned to journey: J1
Handling vehicle: V2 assigned to journey: J1
Handling vehicle: V1 assigned to journey: J2
J1 CurrentVehicleChanged from V2 to null
Handling vehicle: V1 assigned to journey: J2
Handling vehicle: V2 assigned to journey: J1 <-- still handled after J1.CurrentVehicle set to null
Handling vehicle: V2 assigned to journey: J1
Handling vehicle: V1 assigned to journey: J2
Handling vehicle: V2 assigned to journey: J1
Handling vehicle: V1 assigned to journey: J2
Handling vehicle: V2 assigned to journey: J1
Handling vehicle: V1 assigned to journey: J2
Handling vehicle: V2 assigned to journey: J1
*/
// Simulate changes
journey.ChangeVehicle(vehicle1);
journey2.ChangeVehicle(vehicle2);
Thread.Sleep(TimeSpan.FromSeconds(6));
journey.ChangeVehicle(null);
Thread.Sleep(TimeSpan.FromSeconds(6));
journey.ChangeVehicle(vehicle2);
journey2.ChangeVehicle(vehicle1);
Thread.Sleep(TimeSpan.FromSeconds(6));
journey.ChangeVehicle(null);
Console.ReadLine();
}
public class VehicleHandler
{
private readonly HashSet<Vehicle> _vehiclesToHandle = new();
readonly TimeSpan _updateInterval = TimeSpan.FromSeconds(2);
public void OnJourneyCurrentVehicleChanged(object sender, FieldEventArgs<Journey, Vehicle> e)
{
var journey = e.Item;
if (Validate(journey))
{
_vehiclesToHandle.Add(journey.CurrentVehicle);
}
else if (journey.CurrentVehicle == null && e.LastValue != null)
{
_vehiclesToHandle.Remove(e.LastValue);
}
Console.WriteLine($"{e.Item.Name} CurrentVehicleChanged from {e.LastValue?.Name ?? "null"} to {e.Value?.Name ?? "null"}");
}
public static bool Validate(Journey journey)
{
return journey.CurrentVehicle != null;
}
public void Start()
{
Observable.Interval(_updateInterval)
.SelectMany(x => _vehiclesToHandle)
.Subscribe(x =>
{
Console.WriteLine($"Handling vehicle: {x.Name} assigned to journey: {x.CurrentJourneyName}");
});
}
}
public class Vehicle
{
public string Name { get; set; }
public string CurrentJourneyName { get; set; }
}
public class Journey
{
public Journey(string name)
{
Name = name;
}
public string Name { get; set; }
private Vehicle _currentVehicle;
public Vehicle CurrentVehicle
{
get => _currentVehicle;
private set
{
var lastValue = _currentVehicle;
_currentVehicle = value;
if (_currentVehicle != null) _currentVehicle.CurrentJourneyName = this.Name;
CurrentVehicleChanged?.Invoke(this, new FieldEventArgs<Journey, Vehicle>(this, _currentVehicle, lastValue));
}
}
public void ChangeVehicle(Vehicle vehicle)
{
CurrentVehicle = vehicle;
}
}
public class FieldEventArgs<TItem, TValue> : EventArgs
{
public TItem Item { get; }
public TValue Value { get; }
public TValue LastValue { get; }
public FieldEventArgs(TItem item, TValue value, TValue lastValue)
{
Item = item;
Value = value;
LastValue = lastValue;
}
}
}
}