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#pragma once
#include <Interpreters/SystemLog.h>
#include <Common/ProfileEvents.h>
#include <Common/CurrentMetrics.h>
#include <Common/ThreadPool_fwd.h>
#include <Core/NamesAndTypes.h>
#include <Core/NamesAndAliases.h>
#include <vector>
#include <atomic>
#include <ctime>
namespace DB
{
/** MetricLog is a log of metric values measured at regular time interval.
*/
struct MetricLogElement
{
time_t event_time{};
Decimal64 event_time_microseconds{};
std::vector<ProfileEvents::Count> profile_events;
std::vector<CurrentMetrics::Metric> current_metrics;
static std::string name() { return "MetricLog"; }
static NamesAndTypesList getNamesAndTypes();
static NamesAndAliases getNamesAndAliases() { return {}; }
void appendToBlock(MutableColumns & columns) const;
static const char * getCustomColumnList() { return nullptr; }
};
class MetricLog : public SystemLog<MetricLogElement>
{
using SystemLog<MetricLogElement>::SystemLog;
public:
void shutdown() override;
/// Launches a background thread to collect metrics with interval
void startCollectMetric(size_t collect_interval_milliseconds_);
/// Stop background thread. Call before shutdown.
void stopCollectMetric();
private:
void metricThreadFunction();
std::unique_ptr<ThreadFromGlobalPool> metric_flush_thread;
size_t collect_interval_milliseconds;
std::atomic<bool> is_shutdown_metric_thread{false};
};
}
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