double extractValueImpl()

in fb303/detail/QuantileStatMap-inl.h [255:287]

• 33 lines of code
• 11 McCabe index (conditional complexity)

double extractValueImpl(
    const StatDef& statDef,
    const folly::QuantileEstimates& estimate,
    std::chrono::seconds duration) {
  switch (statDef.type) {
    case ExportType::PERCENT:
      for (const auto& pr : estimate.quantiles) {
        if (pr.first == statDef.quantile) {
          return pr.second;
        }
      }
      LOG(FATAL) << "Requested missing quantile: " << statDef.quantile;
    case ExportType::SUM:
      return estimate.sum;
    case ExportType::COUNT:
      return estimate.count;
    case ExportType::AVG:
      if (estimate.count > 0) {
        return estimate.sum / estimate.count;
      }
      return 0;
    case ExportType::RATE:
      if (duration.count() > 0) {
        const auto& numerator = FLAGS_fb303_qstat_legacy_use_count_for_rate
            ? estimate.count
            : estimate.sum;
        return numerator / duration.count();
      }
      return estimate.count;
  }
  LOG(FATAL) << "Unknown export type: " << statDef.type;
  return 0;
}