metrics_storage.hpp

#pragma once
 
#include <vector>
 
#include <userver/utils/statistics/fwd.hpp>
#include <userver/utils/statistics/metric_tag.hpp>
 
USERVER_NAMESPACE_BEGIN
 
namespace utils::statistics {
 
/// @brief Storage of metrics registered with MetricTag<Metric>
/// @note The class is thread-safe. See also the note about thread-safety
/// on MetricTag<Metric>.
class MetricsStorage final {
 public:
  MetricsStorage();
 
  [[nodiscard]] std::vector<Entry> RegisterIn(Storage& statistics_storage);
 
  /// Get metric data by type
  template <typename Metric>
  Metric& GetMetric(const MetricTag<Metric>& tag) {
    return impl::GetMetric<Metric>(metrics_, tag.key_);
  }
 
  void ResetMetrics();
 
 private:
  impl::MetricMap metrics_;
};
 
using MetricsStoragePtr = std::shared_ptr<MetricsStorage>;
 
}  // namespace utils::statistics
 
USERVER_NAMESPACE_END