chromium/net/nqe/throughput_analyzer.h

// Copyright 2016 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef NET_NQE_THROUGHPUT_ANALYZER_H_
#define NET_NQE_THROUGHPUT_ANALYZER_H_

#include <stdint.h>

#include <unordered_map>
#include <unordered_set>

#include "base/functional/callback.h"
#include "base/memory/raw_ptr.h"
#include "base/memory/scoped_refptr.h"
#include "base/sequence_checker.h"
#include "base/time/time.h"
#include "net/base/net_export.h"
#include "net/log/net_log_with_source.h"

namespace {
ThroughputObservationCallback;
}

namespace base {
class SingleThreadTaskRunner;
class TickClock;
}

namespace net {

class NetworkQualityEstimatorParams;
class NetworkQualityEstimator;
class URLRequest;

namespace nqe::internal {

// Makes throughput observations. Polls NetworkActivityMonitor
// (TrafficStats on Android) to count number of bits received over throughput
// observation windows in accordance with the following rules:
// (1) A new window of observation begins any time a URL request header is
//     about to be sent, or a request completes or is destroyed.
// (2) A request is "active" if its headers are sent, but it hasn't completed,
//     and "local" if destined to local host. If at any time during a
//     throughput observation window there is an active, local request, the
//     window is discarded.
// (3) If less than 32KB is received over the network during a window of
//     observation, that window is discarded.
class NET_EXPORT_PRIVATE ThroughputAnalyzer { … };

}  // namespace nqe::internal

}  // namespace net

#endif  // NET_NQE_THROUGHPUT_ANALYZER_H_