cache_statistics.hpp

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#pragma once
 
 
#include <atomic>
#include <chrono>
#include <cstddef>
 
#include <userver/cache/update_type.hpp>
#include <userver/formats/json_fwd.hpp>
#include <userver/utils/statistics/writer.hpp>
 
USERVER_NAMESPACE_BEGIN
 
namespace cache {
 
namespace impl {
 
struct UpdateStatistics final {
  std::atomic<std::size_t> update_attempt_count{0};
  std::atomic<std::size_t> update_no_changes_count{0};
  std::atomic<std::size_t> update_failures_count{0};
 
  std::atomic<std::size_t> documents_read_count{0};
  std::atomic<std::size_t> documents_parse_failures{0};
 
  std::atomic<std::chrono::steady_clock::time_point> last_update_start_time{{}};
  std::atomic<std::chrono::steady_clock::time_point>
      last_successful_update_start_time{{}};
  std::atomic<std::chrono::milliseconds> last_update_duration{{}};
};
 
void DumpMetric(utils::statistics::Writer& writer,
                const UpdateStatistics& stats);
 
struct Statistics final {
  UpdateStatistics full_update;
  UpdateStatistics incremental_update;
  std::atomic<std::size_t> documents_current_count{0};
};
 
void DumpMetric(utils::statistics::Writer& writer, const Statistics& stats);
 
}  // namespace impl
 
class UpdateStatisticsScope final {
 public:
  // For internal use only
  UpdateStatisticsScope(impl::Statistics& stats, cache::UpdateType type);
 
  ~UpdateStatisticsScope();
 
  void Finish(std::size_t documents_count);
 
  void FinishNoChanges();
 
  void IncreaseDocumentsReadCount(std::size_t add);
 
  void IncreaseDocumentsParseFailures(std::size_t add);
 
 private:
  impl::Statistics& stats_;
  impl::UpdateStatistics& update_stats_;
  bool finished_{false};
  const std::chrono::steady_clock::time_point update_start_time_;
};
 
}  // namespace cache
 
USERVER_NAMESPACE_END