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