//The ArrivalsMonitor class includes the Subscribe and Unsubscribe methods.
internal virtual void Subscribe(BaggageHandler provider)
{
Console.WriteLine(string.Format("{0}准备订阅通知", name));
cancellation = provider.Subscribe(this);
Console.WriteLine(string.Format("{0}订阅通知成功", name));
}
public virtual void Subscribe(BaggageHandler provider)
{
cancellation = provider.Subscribe(this);
}
