DataObserver

Type Parameters:

T - type of data that is observed Query) to receive data changes.

All Known Implementing Classes:

QueryPublisher.SubscribedObservers, SubscriptionBuilder.ActionObserver, WeakDataObserver
```
public interface DataObserver<T>
```
Observer that can be subscribed to publishers (e.g. @BoxStore and Query).

- Method Summary
  
  All Methods Instance Methods Abstract Methods
  Modifier and Type Method Description
  
  void onData(T data)
  Called when data changed.

- Method Detail
  - onData
```
void onData(T data)
```
    Called when data changed.
    Exception note: if this method throws an exception, it can be reacted on via SubscriptionBuilder.onError(ErrorObserver).