// Copyright 2017 Google LLC. All Rights Reserved. This file and proprietary
// source code may only be used and distributed under the Widevine License
// Agreement.
#ifndef WVCDM_METRICS_TIMER_METRIC_H_
#define WVCDM_METRICS_TIMER_METRIC_H_
#include <chrono>

namespace wvcdm {
namespace metrics {
class Timer {
 public:
  Timer() {}
  // Starts the clock running. If the clock was previously set, this resets it.
  // IsStarted will return true after this call.
  void Start();
  // Returns whether or not the timer has started.
  bool IsStarted() const { return is_started_; }
  // Stops the clock and clears the current value.  IsStarted will return false
  // after this call.
  void Clear();
  // Returns the current clock value as milliseconds (AsMs) or microseconds
  // (AsUs).
  double AsMs() const;
  double AsUs() const;

 private:
  std::chrono::time_point<std::chrono::steady_clock> start_;
  bool is_started_ = false;
};
}  // namespace metrics
}  // namespace wvcdm
#endif  // WVCDM_METRICS_TIMER_METRIC_H_