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// Copyright 2021 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef COMPONENTS_PAGE_LOAD_METRICS_BROWSER_RESPONSIVENESS_METRICS_NORMALIZATION_H_
#define COMPONENTS_PAGE_LOAD_METRICS_BROWSER_RESPONSIVENESS_METRICS_NORMALIZATION_H_
#include "base/time/time.h"
#include "components/page_load_metrics/common/page_load_metrics.mojom.h"
#include "third_party/blink/public/common/features.h"
namespace page_load_metrics {
constexpr uint64_t kHighPercentileUpdateFrequency = 50;
// ResponsivenessMetricsNormalization implements some experimental normalization
// strategies for responsiveness metrics. We aggregate user interaction latency
// data from all renderer frames and calculate a score per page load.
class ResponsivenessMetricsNormalization {
public:
ResponsivenessMetricsNormalization();
ResponsivenessMetricsNormalization(
const ResponsivenessMetricsNormalization&) = delete;
ResponsivenessMetricsNormalization& operator=(
const ResponsivenessMetricsNormalization&) = delete;
~ResponsivenessMetricsNormalization();
void AddNewUserInteractionLatencies(
uint64_t num_new_interactions,
const mojom::UserInteractionLatencies& max_event_durations);
void ClearAllUserInteractionLatencies();
// Approximate a high percentile of user interaction latency.
std::optional<mojom::UserInteractionLatency> ApproximateHighPercentile()
const;
uint64_t num_user_interactions() const { return num_user_interactions_; }
std::optional<mojom::UserInteractionLatency> worst_latency() const;
private:
void NormalizeUserInteractionLatencies(
const mojom::UserInteractionLatencies& user_interaction_latencies);
// A sorted list of the worst ten latencies, used to approximate a high
// percentile.
std::vector<mojom::UserInteractionLatency> worst_ten_latencies_;
uint64_t num_user_interactions_ = 0;
};
} // namespace page_load_metrics
#endif // COMPONENTS_PAGE_LOAD_METRICS_BROWSER_RESPONSIVENESS_METRICS_NORMALIZATION_H_
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