lru_cache_statistics.hpp

#pragma once
 
#include <atomic>
#include <chrono>
#include <cstddef>
 
#include <userver/utils/statistics/recentperiod.hpp>
#include <userver/utils/statistics/writer.hpp>
 
USERVER_NAMESPACE_BEGIN
 
namespace cache::impl {
 
struct ExpirableLruCacheStatisticsBase final {
  std::atomic<std::size_t> hits{0};
  std::atomic<std::size_t> misses{0};
  std::atomic<std::size_t> stale{0};
  std::atomic<std::size_t> background_updates{0};
 
  ExpirableLruCacheStatisticsBase();
 
  ExpirableLruCacheStatisticsBase(const ExpirableLruCacheStatisticsBase& other);
 
  void Reset();
 
  ExpirableLruCacheStatisticsBase& operator+=(
      const ExpirableLruCacheStatisticsBase& other);
};
 
struct ExpirableLruCacheStatistics final {
  ExpirableLruCacheStatisticsBase total;
  utils::statistics::RecentPeriod<ExpirableLruCacheStatisticsBase,
                                  ExpirableLruCacheStatisticsBase>
      recent{std::chrono::seconds(5), std::chrono::seconds(60)};
};
 
void CacheHit(ExpirableLruCacheStatistics& stats);
 
void CacheMiss(ExpirableLruCacheStatistics& stats);
 
void CacheStale(ExpirableLruCacheStatistics& stats);
 
void DumpMetric(utils::statistics::Writer& writer,
                const ExpirableLruCacheStatistics& stats);
 
}  // namespace cache::impl
 
USERVER_NAMESPACE_END