class PrefetchBatches(batches.Batches):                                                                
    def Strategy(self, task, app, consumer):                                                           
        handler = super(PrefetchBatches, self).Strategy(task, app, consumer)                           
                                                                                                       
        def task_handler(*args, **kwargs):                                                             
            if consumer.qos.value < self.flush_every:                                                  
                diff = self.flush_every - consumer.qos.value                                           
                consumer.qos.increment_eventually(diff)                                                
            return handler(*args, **kwargs)                                                            
                                                                                                       
        return task_handler