DXR is a code search and navigation tool aimed at making sense of large projects. It supports full-text and regex searches as well as structural queries.

Implementation

Mercurial (c68fe15a81fc)

VCS Links

Line Code
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350
/*
 *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
 *
 *  Use of this source code is governed by a BSD-style license
 *  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 VIDEO_STATS_COUNTER_H_
#define VIDEO_STATS_COUNTER_H_

#include <memory>
#include <memory>
#include <string>

#include "rtc_base/constructormagic.h"
#include "typedefs.h"  // NOLINT(build/include)

namespace webrtc {


class AggregatedCounter;
class Clock;
class Samples;

// |StatsCounterObserver| is called periodically when a metric is updated.
// |StatsCounterObserver| is called periodically when a metric is updated.
class StatsCounterObserver {
 public:
  virtual void OnMetricUpdated(int sample) = 0;

  virtual ~StatsCounterObserver() {}
};

struct AggregatedStats {
struct AggregatedStats {
  std::string ToString() const;
  std::string ToStringWithMultiplier(int multiplier) const;

  int64_t num_samples = 0;
  int min = -1;
  int min = -1;
  int max = -1;
  int average = -1;
  // TODO(asapersson): Consider adding median/percentiles.
};


// Classes which periodically computes a metric.
//
// During a period, |kProcessIntervalMs|, different metrics can be computed e.g:
// - |AvgCounter|: average of samples
// - |PercentCounter|: percentage of samples
// - |PercentCounter|: percentage of samples
// - |PermilleCounter|: permille of samples
//
// Each periodic metric can be either:
// - reported to an |observer| each period
// - reported to an |observer| each period
// - aggregated during the call (e.g. min, max, average)
//
//                 periodically computed
//                    GetMetric()            GetMetric()   => AggregatedStats
//                        ^                      ^            (e.g. min/max/avg)
//                        ^                      ^            (e.g. min/max/avg)
//                        |                      |
// |   *    *  *       *  |  **    *   * *     * | ...
// |<- process interval ->|
//
// (*) - samples
// (*) - samples
//
//
// Example usage:
//
//
// AvgCounter counter(&clock, nullptr);
// counter.Add(5);
// counter.Add(1);
// counter.Add(6);   // process interval passed -> GetMetric() avg:4
// counter.Add(7);
// counter.Add(7);
// counter.Add(3);   // process interval passed -> GetMetric() avg:5
// counter.Add(10);
// counter.Add(20);  // process interval passed -> GetMetric() avg:15
// AggregatedStats stats = counter.GetStats();
// stats: {min:4, max:15, avg:8}
// stats: {min:4, max:15, avg:8}
//

// Note: StatsCounter takes ownership of |observer|.

class StatsCounter {
class StatsCounter {
 public:
  virtual ~StatsCounter();

  // Gets metric within an interval. Returns true on success false otherwise.
  virtual bool GetMetric(int* metric) const = 0;
  virtual bool GetMetric(int* metric) const = 0;

  // Gets the value to use for an interval without samples.
  virtual int GetValueForEmptyInterval() const = 0;

  // Gets aggregated stats (i.e. aggregate of periodically computed metrics).
  // Gets aggregated stats (i.e. aggregate of periodically computed metrics).
  AggregatedStats GetStats();

  // Reports metrics for elapsed intervals to AggregatedCounter and GetStats.
  AggregatedStats ProcessAndGetStats();


  // Reports metrics for elapsed intervals to AggregatedCounter and pauses stats
  // (i.e. empty intervals will be discarded until next sample is added).
  void ProcessAndPause();

  // As above with a minimum pause time. Added samples within this interval will
  // As above with a minimum pause time. Added samples within this interval will
  // not resume the stats (i.e. stop the pause).
  void ProcessAndPauseForDuration(int64_t min_pause_time_ms);

  // Reports metrics for elapsed intervals to AggregatedCounter and stops pause.
  void ProcessAndStopPause();


  // Checks if a sample has been added (i.e. Add or Set called).
  bool HasSample() const;

 protected:
  StatsCounter(Clock* clock,
  StatsCounter(Clock* clock,
               int64_t process_intervals_ms,
               bool include_empty_intervals,
               StatsCounterObserver* observer);

  void Add(int sample);
  void Add(int sample);
  void Set(int64_t sample, uint32_t stream_id);
  void SetLast(int64_t sample, uint32_t stream_id);

  const bool include_empty_intervals_;
  const int64_t process_intervals_ms_;
  const int64_t process_intervals_ms_;
  const std::unique_ptr<AggregatedCounter> aggregated_counter_;
  const std::unique_ptr<Samples> samples_;

 private:
  bool TimeToProcess(int* num_elapsed_intervals);
  bool TimeToProcess(int* num_elapsed_intervals);
  void TryProcess();
  void ReportMetricToAggregatedCounter(int value, int num_values_to_add) const;
  bool IncludeEmptyIntervals() const;
  void Resume();
  void ResumeIfMinTimePassed();
  void ResumeIfMinTimePassed();

  Clock* const clock_;
  const std::unique_ptr<StatsCounterObserver> observer_;
  int64_t last_process_time_ms_;
  bool paused_;
  int64_t pause_time_ms_;
  int64_t min_pause_time_ms_;
  int64_t min_pause_time_ms_;
};

// AvgCounter: average of samples
//
//           | *      *      *      | *           *       | ...
//           | *      *      *      | *           *       | ...
//           | Add(5) Add(1) Add(6) | Add(5)      Add(5)  |
// GetMetric | (5 + 1 + 6) / 3      | (5 + 5) / 2         |
//
// |include_empty_intervals|: If set, intervals without samples will be included
//                            in the stats. The value for an interval is
//                            determined by GetValueForEmptyInterval().
//
//
class AvgCounter : public StatsCounter {
 public:
  AvgCounter(Clock* clock,
             StatsCounterObserver* observer,
             bool include_empty_intervals);
             bool include_empty_intervals);
  ~AvgCounter() override {}

  void Add(int sample);

 private:
 private:
  bool GetMetric(int* metric) const override;

  // Returns the last computed metric (i.e. from GetMetric).
  int GetValueForEmptyInterval() const override;


  RTC_DISALLOW_COPY_AND_ASSIGN(AvgCounter);
};

// MaxCounter: maximum of samples
//
//           | *      *      *      | *           *       | ...
//           | *      *      *      | *           *       | ...
//           | Add(5) Add(1) Add(6) | Add(5)      Add(5)  |
// GetMetric | max: (5, 1, 6)       | max: (5, 5)         |
//
class MaxCounter : public StatsCounter {
 public:
 public:
  MaxCounter(Clock* clock,
             StatsCounterObserver* observer,
             int64_t process_intervals_ms);
  ~MaxCounter() override {}


  void Add(int sample);

 private:
  bool GetMetric(int* metric) const override;
  bool GetMetric(int* metric) const override;
  int GetValueForEmptyInterval() const override;

  RTC_DISALLOW_COPY_AND_ASSIGN(MaxCounter);
};


// PercentCounter: percentage of samples
//
//           | *      *      *      | *           *       | ...
//           | Add(T) Add(F) Add(T) | Add(F)      Add(T)  |
// GetMetric | 100 * 2 / 3          | 100 * 1 / 2         |
// GetMetric | 100 * 2 / 3          | 100 * 1 / 2         |
//
class PercentCounter : public StatsCounter {
 public:
  PercentCounter(Clock* clock, StatsCounterObserver* observer);
  ~PercentCounter() override {}
  ~PercentCounter() override {}

  void Add(bool sample);

 private:
  bool GetMetric(int* metric) const override;
  int GetValueForEmptyInterval() const override;
  int GetValueForEmptyInterval() const override;

  RTC_DISALLOW_COPY_AND_ASSIGN(PercentCounter);
};

// PermilleCounter: permille of samples
// PermilleCounter: permille of samples
//
//           | *      *      *      | *         *         | ...
//           | Add(T) Add(F) Add(T) | Add(F)    Add(T)    |
// GetMetric | 1000 *  2 / 3        | 1000 * 1 / 2        |
//
class PermilleCounter : public StatsCounter {
 public:
 public:
  PermilleCounter(Clock* clock, StatsCounterObserver* observer);
  ~PermilleCounter() override {}

  void Add(bool sample);


 private:
  bool GetMetric(int* metric) const override;
  int GetValueForEmptyInterval() const override;

  RTC_DISALLOW_COPY_AND_ASSIGN(PermilleCounter);
  RTC_DISALLOW_COPY_AND_ASSIGN(PermilleCounter);
};

// RateCounter: units per second
//
//           | *      *      *      | *           *       | ...
//           | *      *      *      | *           *       | ...
//           | Add(5) Add(1) Add(6) | Add(5)      Add(5)  |
//           |<------ 2 sec ------->|                     |
// GetMetric | (5 + 1 + 6) / 2      | (5 + 5) / 2         |
//
// |include_empty_intervals|: If set, intervals without samples will be included
// |include_empty_intervals|: If set, intervals without samples will be included
//                            in the stats. The value for an interval is
//                            determined by GetValueForEmptyInterval().
//                            determined by GetValueForEmptyInterval().
//
class RateCounter : public StatsCounter {
 public:
  RateCounter(Clock* clock,
              StatsCounterObserver* observer,
              bool include_empty_intervals);
  ~RateCounter() override {}
  ~RateCounter() override {}

  void Add(int sample);

 private:
  bool GetMetric(int* metric) const override;
  bool GetMetric(int* metric) const override;
  int GetValueForEmptyInterval() const override;  // Returns zero.

  RTC_DISALLOW_COPY_AND_ASSIGN(RateCounter);
};


// RateAccCounter: units per second (used for counters)
//
//           | *      *      *      | *         *         | ...
//           | Set(5) Set(6) Set(8) | Set(11)   Set(13)   |
//           |<------ 2 sec ------->|                     |
//           |<------ 2 sec ------->|                     |
// GetMetric | (8 - 0) / 2          | (13 - 8) / 2        |
//
// |include_empty_intervals|: If set, intervals without samples will be included
//                            in the stats. The value for an interval is
//                            determined by GetValueForEmptyInterval().
//                            determined by GetValueForEmptyInterval().
//
class RateAccCounter : public StatsCounter {
 public:
  RateAccCounter(Clock* clock,
                 StatsCounterObserver* observer,
                 StatsCounterObserver* observer,
                 bool include_empty_intervals);
  ~RateAccCounter() override {}


  void Set(int64_t sample, uint32_t stream_id);

  // Sets the value for previous interval.
  // To be used if a value other than zero is initially required.
  void SetLast(int64_t sample, uint32_t stream_id);
  void SetLast(int64_t sample, uint32_t stream_id);

 private:
  bool GetMetric(int* metric) const override;
  int GetValueForEmptyInterval() const override;  // Returns zero.


  RTC_DISALLOW_COPY_AND_ASSIGN(RateAccCounter);
};

}  // namespace webrtc


#endif  // VIDEO_STATS_COUNTER_H_