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// <Snippet1>
using System;
using System.Collections.Generic;
public class BaggageInfo
{
private int flightNo;
private string origin;
private int location;
internal BaggageInfo(int flight, string from, int carousel)
{
this.flightNo = flight;
this.origin = from;
this.location = carousel;
}
public int FlightNumber {
get { return this.flightNo; }
}
public string From {
get { return this.origin; }
}
public int Carousel {
get { return this.location; }
}
}
// </Snippet1>
// <Snippet2>
public class BaggageHandler : IObservable<BaggageInfo>
{
private List<IObserver<BaggageInfo>> observers;
private List<BaggageInfo> flights;
public BaggageHandler()
{
observers = new List<IObserver<BaggageInfo>>();
flights = new List<BaggageInfo>();
}
public IDisposable Subscribe(IObserver<BaggageInfo> observer)
{
// Check whether observer is already registered. If not, add it
if (! observers.Contains(observer)) {
observers.Add(observer);
// Provide observer with existing data.
foreach (var item in flights)
observer.OnNext(item);
}
return new Unsubscriber<BaggageInfo>(observers, observer);
}
// Called to indicate all baggage is now unloaded.
public void BaggageStatus(int flightNo)
{
BaggageStatus(flightNo, String.Empty, 0);
}
public void BaggageStatus(int flightNo, string from, int carousel)
{
var info = new BaggageInfo(flightNo, from, carousel);
// Carousel is assigned, so add new info object to list.
if (carousel > 0 && ! flights.Contains(info)) {
flights.Add(info);
foreach (var observer in observers)
observer.OnNext(info);
}
else if (carousel == 0) {
// Baggage claim for flight is done
var flightsToRemove = new List<BaggageInfo>();
foreach (var flight in flights) {
if (info.FlightNumber == flight.FlightNumber) {
flightsToRemove.Add(flight);
foreach (var observer in observers)
observer.OnNext(info);
}
}
foreach (var flightToRemove in flightsToRemove)
flights.Remove(flightToRemove);
flightsToRemove.Clear();
}
}
public void LastBaggageClaimed()
{
foreach (var observer in observers)
observer.OnCompleted();
observers.Clear();
}
}
// </Snippet2>
// <Snippet3>
internal class Unsubscriber<BaggageInfo> : IDisposable
{
private List<IObserver<BaggageInfo>> _observers;
private IObserver<BaggageInfo> _observer;
internal Unsubscriber(List<IObserver<BaggageInfo>> observers, IObserver<BaggageInfo> observer)
{
this._observers = observers;
this._observer = observer;
}
public void Dispose()
{
if (_observers.Contains(_observer))
_observers.Remove(_observer);
}
}
// </Snippet3>