Code example for Collection

  } 
 
  @Override 
  public void onError(final Throwable e)
  { 
    _exceptions.add(e);
    checkDone(); 
  } 
 
  private void checkDone() 
  { 
    if (_count.decrementAndGet() == 0)
    { 
      if (_exceptions.isEmpty())
      { 
        _callback.onSuccess(None.none()); 
      } 
      else 
      { 
        _callback.onError(new MultiException(_exceptions));
      } 
    } 
  } 
}