code: public void createAccumulator(final OnDemandStatsProducer producer, final A annotation, final Method method) {
  		if (producer != null && annotation != null) {
  
  			final String statsName = (method == null) ? OnDemandStatsProducer.CUMULATED_STATS_NAME : method.getName();
  
  			String accumulatorName = getName(annotation);
  			if (StringUtils.isEmpty(accumulatorName))
  				accumulatorName = method == null ? formAccumulatorNameForClass(producer, annotation) :
  						formAccumulatorNameForMethod(producer, annotation, method);
  
  			createAccumulator(
  					producer.getProducerId(),
  					annotation,
  					accumulatorName,
  					statsName
  			);
  		}
  	}
docs: Create and register new {@link Accumulator} for class/method level stats accumulation.
  In case producer or annotation is null does nothing.
  
  @param producer
  stats producer
  @param annotation
  {@link Accumulate} or {@link AccumulateWithSubClasses} annotation used to create {@link Accumulator}.
  @param method
  {@link Method} that was annotated or null in case ot class-level accumulator.