expand_uma_logger.h

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/*  Copyright (c) 2018 The WebRTC project authors. All Rights Reserved.

 *  Use of this source code is governed by a BSD-style license

 *  that can be found in the LICENSE file in the root of the source

 *  tree. An additional intellectual property rights grant can be found

 *  in the file PATENTS.  All contributing project authors may

 *  be found in the AUTHORS file in the root of the source tree.

*/

#ifndef MODULES_AUDIO_CODING_NETEQ_EXPAND_UMA_LOGGER_H_

#define MODULES_AUDIO_CODING_NETEQ_EXPAND_UMA_LOGGER_H_

#include <stdint.h>

#include <memory>

#include <string>

#include "absl/strings/string_view.h"

#include "absl/types/optional.h"

#include "api/neteq/tick_timer.h"

namespace webrtc {

// This class is used to periodically log values to a UMA histogram. The caller

// is expected to update this class with an incremental sample counter which

// counts expand samples. At the end of each logging period, the class will

// calculate the fraction of samples that were expand samples during that period

// and report that in percent. The logging period must be strictly positive.

// Does not take ownership of tick_timer and the pointer must refer to a valid

// object that outlives the one constructed.

class ExpandUmaLogger {

 public:

  ExpandUmaLogger(absl::string_view uma_name,

                  int logging_period_s,

                  const TickTimer* tick_timer);

  ~ExpandUmaLogger();

  ExpandUmaLogger(const ExpandUmaLogger&) = delete;

  ExpandUmaLogger& operator=(const ExpandUmaLogger&) = delete;

  // In this call, value should be an incremental sample counter. The sample

  // rate must be strictly positive.

  void UpdateSampleCounter(uint64_t value, int sample_rate_hz);

 private:

  const std::string uma_name_;

  const int logging_period_s_;

  const TickTimer& tick_timer_;

  std::unique_ptr<TickTimer::Countdown> timer_;

  absl::optional<uint64_t> last_logged_value_;

  uint64_t last_value_ = 0;

  int sample_rate_hz_ = 0;

};

}  // namespace webrtc

#endif  // MODULES_AUDIO_CODING_NETEQ_EXPAND_UMA_LOGGER_H_