lag_monitor.h

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#ifndef LAG_MONITOR_H
#define LAG_MONITOR_H
 
#include <QElapsedTimer>
#include <QList>
#include <QLoggingCategory>
#include <QObject>
#include <QtGlobal>
#include <qtmetamacros.h>
 
inline Q_LOGGING_CATEGORY(LagMonitorLog, "lag_monitor");
 
class QTimer;

class LagMonitor : public QObject
{
    Q_OBJECT
 
public:
    struct StallRecord
    {
        qint64 timestampMsSinceEpoch = 0; 
        qint64 durationMs = 0; 
    };
 
    static constexpr int TICK_INTERVAL_MS = 500;
    static constexpr int STALL_THRESHOLD_MS = 2000;
    static constexpr int MAX_RECORDED_STALLS = 32;

    static constexpr qint64 MAX_PLAUSIBLE_STALL_MS = 600000;
 
    explicit LagMonitor(QObject *parent = nullptr);

    QList<StallRecord> recentStalls() const;
 
    void clearStalls();

    void recordGap(qint64 gapMs);
 
protected:
    bool eventFilter(QObject *obj, QEvent *event) override;
 
private slots:
    void checkTick();
 
private:
    QTimer *timer;
    QElapsedTimer tickClock; 
    QList<StallRecord> stalls;
};
 
#endif