@Override
public void onFetchResult(final Result<FetchedItem<OriginalInput>, OriginalInput> result) {
fetch.add(result);
}
@Override
public void onProcessingResult(final Result<FetchedItem<OriginalInput>, Output> result) {
processing.add(result);
}
public ResultStatistics build() {
return new ResultStatistics(fetch.build(), processing.build(), hasListenerDelegationFailures);
}