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- // Copyright 2022 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.
- #ifndef COMPONENTS_NETWORK_TIME_HISTORICAL_LATENCIES_CONTAINER_H_
- #define COMPONENTS_NETWORK_TIME_HISTORICAL_LATENCIES_CONTAINER_H_
- #include "base/containers/ring_buffer.h"
- #include "base/time/time.h"
- #include "third_party/abseil-cpp/absl/types/optional.h"
- namespace network_time {
- // Number of historical latencies to record.
- constexpr int kMaxNumHistoricalLatencies = 16;
- // A class to record latencies of the previous `kNumHistoricalLatencies` time
- // fetches.
- class HistoricalLatenciesContainer {
- public:
- // Records a new latency in the container.
- void Record(base::TimeDelta latency);
- // Computes the standard deviation of the latest latencies. Returns nullopt
- // if not enough latencies have been recorded yet.
- absl::optional<base::TimeDelta> StdDeviation() const;
- private:
- base::RingBuffer<base::TimeDelta, size_t{kMaxNumHistoricalLatencies}>
- latencies_;
- };
- } // namespace network_time
- #endif // COMPONENTS_NETWORK_TIME_HISTORICAL_LATENCIES_CONTAINER_H_
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