internal StreamSubscriptionHandle <T> AddObserver <T>(StreamImpl <T> stream, IAsyncObserver <T> observer, IStreamFilterPredicateWrapper filter)
{
if (null == stream)
{
throw new ArgumentNullException("stream");
}
if (null == observer)
{
throw new ArgumentNullException("observer");
}
try
{
if (logger.IsVerbose)
{
logger.Verbose("{0} AddObserver for stream {1}", providerRuntime.ExecutingEntityIdentity(), stream);
}
// Note: The caller [StreamConsumer] already handles locking for Add/Remove operations, so we don't need to repeat here.
IStreamObservers obs = allStreamObservers.GetOrAdd(stream.StreamId, new ObserversCollection <T>());
var wrapper = new ObserverWrapper <T>(observer, stream, filter);
((ObserversCollection <T>)obs).AddObserver(wrapper);
return(wrapper);
}
catch (Exception exc)
{
logger.Error((int)ErrorCode.StreamProvider_AddObserverException, String.Format("{0} StreamConsumerExtension.AddObserver({1}) caugth exception.",
providerRuntime.ExecutingEntityIdentity(), stream), exc);
throw;
}
}
public ImageReference(string uri, RefCountImageCache parent)
{
Uri = uri;
_parent = parent;
_subject = new ReplaySubject <Unit>(1);
_observerWrapper = new ObserverWrapper(_subject);
_subscription = new SingleAssignmentDisposable();
InitializeImage();
}
public NSObject AddObserver(NSString key, Action <ObserverActionArgs> action, NSObject control = null)
{
if (notifications == null)
{
notifications = new List <NSObject> ();
}
if (control == null)
{
control = Control;
}
var wrap = new ObserverWrapper {
Action = new WeakReference(action), Widget = new WeakReference(this.Widget)
};
var observer = NSNotificationCenter.DefaultCenter.AddObserver(key, wrap.Run, control);
notifications.Add(observer);
return(observer);
}
public IDisposable Subscribe(IObserver <TSource> observer)
{
ObserverWrapper wrapper = new ObserverWrapper(observer);
return(source.LinkTo(wrapper));
}
internal void RemoveObserver(ObserverWrapper <T> observer)
{
ObserverWrapper <T> ignore;
localObservers.TryRemove(observer.ObserverGuid, out ignore);
}
internal void AddObserver(ObserverWrapper <T> observer)
{
localObservers.TryAdd(observer.ObserverGuid, observer);
}
