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