blob: 5ea43ed61c5e3f3ef7e19661d5af4a65c6f900ac [file] [log] [blame]
// Copyright 2018 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "base/component_export.h"
#include "base/metrics/histogram.h"
#include "base/optional.h"
#include "base/time/time.h"
namespace scheduling_metrics {
// Helper class to measure the total duration of the event accounting for
// possibility of the renderer process going away at any point.
// This is implemented by "undoing" old total value and "applying" new one
// each time RecordAdditionalDuration() is called.
// "Undoing" is implemented by having a second "negative" histogram, so to
// obtain the result, |positive_histogram - negative_histogram| difference
// should be analysed.
class COMPONENT_EXPORT(SCHEDULING_METRICS) TotalDurationMetricReporter {
TotalDurationMetricReporter(const char* positive_histogram_name,
const char* negative_histogram_name);
void RecordAdditionalDuration(base::TimeDelta duration);
void Reset();
base::Optional<base::TimeDelta> reported_value_;
base::HistogramBase* positive_histogram_;
base::HistogramBase* negative_histogram_;
} // namespace scheduling_metrics