/// <summary>
/// Ctor.
/// </summary>
/// <param name="updateObserver">for indicating updates to</param>
public IStreamSortRankRandomAccessImpl(RandomAccessByIndexObserver updateObserver)
{
_updateObserver = updateObserver;
}
/// <summary>Ctor. </summary>
/// <param name="updateObserver">is invoked when updates are received</param>
public IStreamRandomAccess(RandomAccessByIndexObserver updateObserver)
{
_updateObserver = updateObserver;
_arrayList = new List <EventBean>();
}