internal void AddListener(ActivityListener listener)
{
if (_listeners == null)
{
Interlocked.CompareExchange(ref _listeners, new SynchronizedList <ActivityListener>(), null);
}
_listeners.AddIfNotExist(listener);
}
/// <summary>
/// Add a listener to the <see cref="Activity"/> starting and stopping events.
/// </summary>
/// <param name="listener"> The <see cref="ActivityListener"/> object to use for listeneing to the <see cref="Activity"/> events.</param>
public static void AddActivityListener(ActivityListener listener)
{
if (listener == null)
{
throw new ArgumentNullException(nameof(listener));
}
if (s_allListeners.AddIfNotExist(listener))
{
s_activeSources.EnumWithAction(source => {
var shouldListenTo = listener.ShouldListenTo;
if (shouldListenTo != null && shouldListenTo(source))
{
source.AddListener(listener);
}
});
}
}
