scoped_timer.h

#ifndef SCOPED_TIMER_H_
#define SCOPED_TIMER_H_
/**
 * Utility class to dump usecs.
 */
#include <chrono>
#include <string>

#include "directory_container.h"
#include "disallow.h"

/*
  system_clock, monotonic_clock and high_resolution_clock are supposed to exist,
  we have steady_clock and system_lock.
 */
namespace scoped_timer {

class ScopedTimer {
 public:
  explicit ScopedTimer(const std::string name)
      : name_(name), begin_(std::chrono::steady_clock::now()) {}

  ~ScopedTimer();
  static std::string dump();

 private:
  const std::string name_;

  std::chrono::steady_clock::time_point begin_;
  DISALLOW_COPY_AND_ASSIGN(ScopedTimer);
};

class StatusHandler : public directory_container::File {
 public:
  StatusHandler();
  virtual ~StatusHandler();

  virtual int Getattr(struct stat *stbuf) override;
  virtual ssize_t Read(char *buf, size_t size, off_t offset) override;
  virtual int Open() override;
  virtual int Release() override;

 private:
  void RefreshMessage();
  std::string message_;
  DISALLOW_COPY_AND_ASSIGN(StatusHandler);
};
}  // namespace scoped_timer

#endif