code: private void storeResult(@NonNull final OperationDelivery<?> operationDelivery) {
          logd("store delivery " + operationDelivery);
          mStoredResults.add(new SoftReference<OperationDelivery<?>>(operationDelivery));
      }
docs: Storing an operation result to use it later.
  
  @param operationDelivery an operation result to be stored
  @see #deliverResult(OperationDelivery)