static Task CallOnStart(OrderedObserver observer, CancellationToken cancellationToken)
{
try
{
return(observer.Observer?.OnStart(cancellationToken) ?? Task.CompletedTask);
}
catch (Exception ex)
{
return(Task.FromException(ex));
}
}
public IDisposable Subscribe(int stage, ILifecycleObserver observer)
{
if (observer == null)
{
throw new ArgumentNullException(nameof(observer));
}
var orderedObserver = new OrderedObserver(stage, observer);
this.subscribers.TryAdd(orderedObserver, orderedObserver);
return(new Disposable(() => Remove(orderedObserver)));
}
public virtual IDisposable Subscribe(string observerName, int stage, ILifecycleObserver observer)
{
if (observer == null)
{
throw new ArgumentNullException(nameof(observer));
}
if (this.highStage.HasValue)
{
throw new InvalidOperationException("Lifecycle has already been started.");
}
var orderedObserver = new OrderedObserver(stage, observer);
this.subscribers.Add(orderedObserver);
return(new Disposable(() => this.subscribers.Remove(orderedObserver)));
}