public void RemoveSubscriber(IMessageSubscriber subscriber)
{
lock (_syncRoot)
{
if (!_subscribers.Remove(subscriber))
{
throw new InvalidOperationException($"Unknown subscriber {subscriber}");
}
subscriber.OnMessage("Good bye!");
}
}
public void RegisterSubscriber(IMessageSubscriber subscriber)
{
lock (_syncRoot)
{
if (!_subscribers.Add(subscriber))
{
throw new InvalidOperationException($"Subscriber {subscriber} is already registered");
}
subscriber.OnMessage("Hello, new subscriber!");
}
}
