public void Observe(Action <ObservationType, T> handler)
{
CancelObservation();
_childEventListener = new ChildEventListener <T>(handler);
_dbGroupNode.AddChildEventListener(_childEventListener);
}
private void CheckAndLoadDatabaseListener()
{
if (_databaseChildListener == null)
{
_databaseChildListener = (CommentService)SimpleIoc.Default.GetInstance <ICommentService>();
}
}
public void CancelObservation()
{
if (_childEventListener != null)
{
_dbGroupNode.RemoveEventListener(_childEventListener);
_childEventListener = null;
}
}
void Start()
{
parentListener = FindParentListenter(transform);
if (parentListener == null)
{
Debug.LogError(name + ": cant find parent listener");
}
}
public void ObserveAfterId(string afterId, Action <ObservationType, T> handler)
{
CancelObservation();
var query = _dbGroupNode.OrderByKey();
// If afterId provided, start observing from this id
if (!string.IsNullOrEmpty(afterId))
{
query = query.StartAt(afterId);
}
_childEventListener = new ChildEventListener <T>(handler, afterId);
query.AddChildEventListener(_childEventListener);
}
/// <summary>
/// Equivalent to AddChildEventListener, except returns an IObservable for use with reactive extensions.
/// </summary>
/// <param name="dbQuery">The database query reference.</param>
/// <param name="listener">A reference to the listener so you can remove it, later.</param>
/// <returns>Returns a stream of results containing a snapshot and event type.</returns>
public static IObservable <ChildEventResult> AddChildEventListenerRx(this Query dbQuery, out IChildEventListener listener)
{
var eventSubject = new Subject <ChildEventResult>();
listener = dbQuery.AddChildEventListener(new ChildEventListener(eventSubject));
return(eventSubject);
}
