TraceEventWriter.h

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#ifndef TRACEEVENTWRITER_H
#define TRACEEVENTWRITER_H
 
#include <chrono>
#include <QFile>
#include <mutex>
#include <thread>
#include <condition_variable>
#include <deque>
#include <memory>
 
class TraceEventWriter {
public:
    struct Event {
        std::string name;
        std::string category;
        char phase = 0;
        uint64_t timestamp;
        int64_t duration = 0; // only for complete events
        int32_t pid;
        int32_t tid;
        std::string args_comment;
    };
    enum Phase {
        PHASE_BEGIN = 'B',
        PHASE_END = 'E',
        PHASE_COUNTER = 'C',
        PHASE_COMPLETE = 'X',
    };
private:
    std::mutex mutex_;
    std::thread thread_;
    std::condition_variable cv_;
    bool interrupted_ = false;
    std::deque<std::shared_ptr<Event>> queue_;
    QFile file_;
    std::chrono::steady_clock::time_point start_time_;
    uint64_t ts();
    std::string escape(std::string const &s);
    void write(Event const &item, bool comma);
public:
    TraceEventWriter();
    ~TraceEventWriter();
        void open(const QString &dir);
    void close();
    void put(Event event);
};
 
#endif // TRACEEVENTWRITER_H