/// <summary>
/// Returns a observable of cache changes preceeded with the initital cache state
/// </summary>
/// <param name="predicate">The result will be filtered using the specfied predicate.</param>
/// <returns></returns>
public IObservable <IChangeSet <TObject, TKey> > Connect(Func <TObject, bool> predicate = null)
{
return(Observable.Defer(() =>
{
var initial = _innerCache.GetInitialUpdates(predicate);
var changes = Observable.Return(initial).Concat(_changes);
return (predicate == null ? changes : changes.Filter(predicate))
.NotEmpty();
}));
}