blob: 13cb9324a7ee0b81660c5235bf8c587f827906f2 [file] [log] [blame]
// Copyright 2022 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include <string>
#include <vector>
#include "base/containers/flat_map.h"
#include "base/memory/ref_counted.h"
#include "base/memory/weak_ptr.h"
#include "base/time/tick_clock.h"
#include "base/time/time.h"
namespace base {
class SequencedTaskRunner;
namespace chromecast {
class MetricsRecorder;
// Helper class to measure and record the time until a named event. The class
// must be destroyed on the same sequence it was created on, but is otherwise
// thread safe.
class TimedEventRecorder final {
explicit TimedEventRecorder(MetricsRecorder* metrics_recorder);
TimedEventRecorder(const TimedEventRecorder&) = delete;
TimedEventRecorder& operator=(const TimedEventRecorder&) = delete;
// Start measuring the time until RecordEvent(|event_name|). When the event
// occurs, a metrics event will be recorded with the name |measurement_name|
// and the elapsed time in milliseconds.
void MeasureTimeUntilEvent(const std::string& event_name,
const std::string& measurement_name,
base::TimeTicks now);
// Make a record of |event_name| and handle any matching ongoing measurements.
void RecordEvent(const std::string& event_name, base::TimeTicks now);
struct TimelineMeasurement {
std::string name;
base::TimeTicks start_time;
MetricsRecorder* const metrics_recorder_;
const scoped_refptr<base::SequencedTaskRunner> task_runner_;
// Maps a named event to a set of TimelineMeasurements that will conclude with
// that event.
base::flat_map<std::string /* event_name */, std::vector<TimelineMeasurement>>
base::WeakPtrFactory<TimedEventRecorder> weak_factory_{this};
} // namespace chromecast