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Without.cs
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Without.cs
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using Lamar;
using Xunit;
namespace WithoutMediatR.Notification.Observer;
record Ping(string Message);
internal interface ISubject : IObservable<Ping>
{
void SendMessage(Ping message);
}
internal class Subject : ISubject
{
private readonly ISet<IObserver<Ping>> _observers = new HashSet<IObserver<Ping>>();
IDisposable IObservable<Ping>.Subscribe(IObserver<Ping> observer)
{
_observers.Add(observer);
return new Unsubscriber(observer, _observers);
}
void ISubject.SendMessage(Ping message)
{
foreach (var observer in _observers)
{
observer.OnNext(message);
}
}
}
internal class Unsubscriber : IDisposable
{
private readonly IObserver<Ping> _observer;
private readonly ICollection<IObserver<Ping>> _observers;
internal Unsubscriber(
IObserver<Ping> observer,
ICollection<IObserver<Ping>> observers)
{
_observer = observer;
_observers = observers;
}
void IDisposable.Dispose()
{
_observers.Remove(_observer);
}
}
internal class Pong1 : IObserver<Ping>
{
internal static string Received;
internal string Message { get; set; }
void IObserver<Ping>.OnCompleted() { }
void IObserver<Ping>.OnError(Exception error) { }
void IObserver<Ping>.OnNext(Ping value)
{
Received = $"Pong1 received {value.Message}";
}
}
internal class Pong2 : IObserver<Ping>
{
internal static string Received;
internal string Message { get; set; }
void IObserver<Ping>.OnCompleted() { }
void IObserver<Ping>.OnError(Exception error) { }
void IObserver<Ping>.OnNext(Ping value)
{
Received = $"Pong2 received {value.Message}";
}
}
public class Without
{
[Fact]
void notify_all_observers()
{
ISubject subject = new Subject();
subject.Subscribe(new Pong1());
subject.Subscribe(new Pong2());
subject.SendMessage(new Ping(Message: "some message"));
Assert.Equal("Pong1 received some message", Pong1.Received);
Assert.Equal("Pong2 received some message", Pong2.Received);
}
}