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572 lines
24 KiB
C++
572 lines
24 KiB
C++
// Copyright 2016 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "net/nqe/network_quality_estimator_params.h"
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#include <stdint.h>
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#include "base/strings/string_number_conversions.h"
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#include "base/time/time.h"
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namespace net {
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const char kForceEffectiveConnectionType[] = "force_effective_connection_type";
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const char kEffectiveConnectionTypeSlow2GOnCellular[] = "Slow-2G-On-Cellular";
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const base::TimeDelta
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kHttpRttEffectiveConnectionTypeThresholds[EFFECTIVE_CONNECTION_TYPE_LAST] =
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{base::TimeDelta::FromMilliseconds(0),
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base::TimeDelta::FromMilliseconds(0),
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base::TimeDelta::FromMilliseconds(2010),
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base::TimeDelta::FromMilliseconds(1420),
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base::TimeDelta::FromMilliseconds(272),
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base::TimeDelta::FromMilliseconds(0)};
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namespace {
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// Minimum valid value of the variation parameter that holds RTT (in
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// milliseconds) values.
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static const int kMinimumRTTVariationParameterMsec = 1;
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// Minimum valid value of the variation parameter that holds throughput (in
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// kilobits per second) values.
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static const int kMinimumThroughputVariationParameterKbps = 1;
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// Returns the value of |parameter_name| read from |params|. If the
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// value is unavailable from |params|, then |default_value| is returned.
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int64_t GetValueForVariationParam(
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const std::map<std::string, std::string>& params,
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const std::string& parameter_name,
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int64_t default_value) {
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const auto it = params.find(parameter_name);
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int64_t variations_value = default_value;
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if (it != params.end() &&
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base::StringToInt64(it->second, &variations_value)) {
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return variations_value;
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}
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return default_value;
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}
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// Returns the variation value for |parameter_name|. If the value is
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// unavailable, |default_value| is returned.
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double GetDoubleValueForVariationParamWithDefaultValue(
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const std::map<std::string, std::string>& params,
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const std::string& parameter_name,
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double default_value) {
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const auto it = params.find(parameter_name);
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if (it == params.end())
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return default_value;
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double variations_value = default_value;
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if (!base::StringToDouble(it->second, &variations_value))
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return default_value;
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return variations_value;
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}
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// Returns the variation value for |parameter_name|. If the value is
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// unavailable, |default_value| is returned.
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std::string GetStringValueForVariationParamWithDefaultValue(
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const std::map<std::string, std::string>& params,
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const std::string& parameter_name,
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const std::string& default_value) {
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const auto it = params.find(parameter_name);
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if (it == params.end())
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return default_value;
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return it->second;
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}
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double GetWeightMultiplierPerSecond(
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const std::map<std::string, std::string>& params) {
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// Default value of the half life (in seconds) for computing time weighted
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// percentiles. Every half life, the weight of all observations reduces by
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// half. Lowering the half life would reduce the weight of older values
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// faster.
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int half_life_seconds = 60;
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int32_t variations_value = 0;
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auto it = params.find("HalfLifeSeconds");
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if (it != params.end() && base::StringToInt(it->second, &variations_value) &&
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variations_value >= 1) {
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half_life_seconds = variations_value;
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}
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DCHECK_GT(half_life_seconds, 0);
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return pow(0.5, 1.0 / half_life_seconds);
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}
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bool GetPersistentCacheReadingEnabled(
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const std::map<std::string, std::string>& params) {
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if (GetStringValueForVariationParamWithDefaultValue(
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params, "persistent_cache_reading_enabled", "true") != "true") {
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return false;
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}
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return true;
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}
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base::TimeDelta GetMinSocketWatcherNotificationInterval(
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const std::map<std::string, std::string>& params) {
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// Use 1000 milliseconds as the default value.
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return base::TimeDelta::FromMilliseconds(GetValueForVariationParam(
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params, "min_socket_watcher_notification_interval_msec", 1000));
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}
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// static
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const char* GetNameForConnectionTypeInternal(
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NetworkChangeNotifier::ConnectionType connection_type) {
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switch (connection_type) {
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case NetworkChangeNotifier::CONNECTION_UNKNOWN:
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return "Unknown";
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case NetworkChangeNotifier::CONNECTION_ETHERNET:
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return "Ethernet";
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case NetworkChangeNotifier::CONNECTION_WIFI:
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return "WiFi";
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case NetworkChangeNotifier::CONNECTION_2G:
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return "2G";
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case NetworkChangeNotifier::CONNECTION_3G:
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return "3G";
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case NetworkChangeNotifier::CONNECTION_4G:
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return "4G";
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case NetworkChangeNotifier::CONNECTION_NONE:
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return "None";
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case NetworkChangeNotifier::CONNECTION_BLUETOOTH:
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return "Bluetooth";
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}
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return "";
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}
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// Sets the default observation for different connection types in
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// |default_observations|. The default observations are different for
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// different connection types (e.g., 2G, 3G, 4G, WiFi). The default
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// observations may be used to determine the network quality in absence of any
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// other information.
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void ObtainDefaultObservations(
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const std::map<std::string, std::string>& params,
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nqe::internal::NetworkQuality default_observations[]) {
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for (size_t i = 0; i < NetworkChangeNotifier::CONNECTION_LAST; ++i) {
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DCHECK_EQ(nqe::internal::InvalidRTT(), default_observations[i].http_rtt());
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DCHECK_EQ(nqe::internal::InvalidRTT(),
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default_observations[i].transport_rtt());
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DCHECK_EQ(nqe::internal::INVALID_RTT_THROUGHPUT,
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default_observations[i].downstream_throughput_kbps());
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}
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// Default observations for HTTP RTT, transport RTT, and downstream throughput
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// Kbps for the various connection types. These may be overridden by
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// variations params. The default observation for a connection type
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// corresponds to typical network quality for that connection type.
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default_observations[NetworkChangeNotifier::CONNECTION_UNKNOWN] =
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nqe::internal::NetworkQuality(base::TimeDelta::FromMilliseconds(115),
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base::TimeDelta::FromMilliseconds(55),
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1961);
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default_observations[NetworkChangeNotifier::CONNECTION_ETHERNET] =
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nqe::internal::NetworkQuality(base::TimeDelta::FromMilliseconds(90),
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base::TimeDelta::FromMilliseconds(33),
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1456);
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default_observations[NetworkChangeNotifier::CONNECTION_WIFI] =
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nqe::internal::NetworkQuality(base::TimeDelta::FromMilliseconds(116),
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base::TimeDelta::FromMilliseconds(66),
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2658);
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default_observations[NetworkChangeNotifier::CONNECTION_2G] =
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nqe::internal::NetworkQuality(base::TimeDelta::FromMilliseconds(1726),
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base::TimeDelta::FromMilliseconds(1531),
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74);
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default_observations[NetworkChangeNotifier::CONNECTION_3G] =
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nqe::internal::NetworkQuality(base::TimeDelta::FromMilliseconds(273),
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base::TimeDelta::FromMilliseconds(209),
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749);
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default_observations[NetworkChangeNotifier::CONNECTION_4G] =
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nqe::internal::NetworkQuality(base::TimeDelta::FromMilliseconds(137),
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base::TimeDelta::FromMilliseconds(80),
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1708);
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default_observations[NetworkChangeNotifier::CONNECTION_NONE] =
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nqe::internal::NetworkQuality(base::TimeDelta::FromMilliseconds(163),
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base::TimeDelta::FromMilliseconds(83), 575);
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default_observations[NetworkChangeNotifier::CONNECTION_BLUETOOTH] =
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nqe::internal::NetworkQuality(base::TimeDelta::FromMilliseconds(385),
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base::TimeDelta::FromMilliseconds(318),
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476);
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// Override using the values provided via variation params.
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for (size_t i = 0; i <= NetworkChangeNotifier::CONNECTION_LAST; ++i) {
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NetworkChangeNotifier::ConnectionType type =
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static_cast<NetworkChangeNotifier::ConnectionType>(i);
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int32_t variations_value = kMinimumRTTVariationParameterMsec - 1;
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std::string parameter_name =
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std::string(GetNameForConnectionTypeInternal(type))
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.append(".DefaultMedianRTTMsec");
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auto it = params.find(parameter_name);
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if (it != params.end() &&
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base::StringToInt(it->second, &variations_value) &&
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variations_value >= kMinimumRTTVariationParameterMsec) {
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default_observations[i] = nqe::internal::NetworkQuality(
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base::TimeDelta::FromMilliseconds(variations_value),
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default_observations[i].transport_rtt(),
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default_observations[i].downstream_throughput_kbps());
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}
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variations_value = kMinimumRTTVariationParameterMsec - 1;
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parameter_name = std::string(GetNameForConnectionTypeInternal(type))
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.append(".DefaultMedianTransportRTTMsec");
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it = params.find(parameter_name);
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if (it != params.end() &&
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base::StringToInt(it->second, &variations_value) &&
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variations_value >= kMinimumRTTVariationParameterMsec) {
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default_observations[i] = nqe::internal::NetworkQuality(
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default_observations[i].http_rtt(),
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base::TimeDelta::FromMilliseconds(variations_value),
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default_observations[i].downstream_throughput_kbps());
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}
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variations_value = kMinimumThroughputVariationParameterKbps - 1;
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parameter_name = std::string(GetNameForConnectionTypeInternal(type))
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.append(".DefaultMedianKbps");
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it = params.find(parameter_name);
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if (it != params.end() &&
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base::StringToInt(it->second, &variations_value) &&
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variations_value >= kMinimumThroughputVariationParameterKbps) {
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default_observations[i] = nqe::internal::NetworkQuality(
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default_observations[i].http_rtt(),
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default_observations[i].transport_rtt(), variations_value);
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}
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}
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}
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// Sets |typical_network_quality| to typical network quality for different
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// effective connection types.
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void ObtainTypicalNetworkQualities(
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const std::map<std::string, std::string>& params,
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nqe::internal::NetworkQuality typical_network_quality[]) {
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for (size_t i = 0; i < EFFECTIVE_CONNECTION_TYPE_LAST; ++i) {
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DCHECK_EQ(nqe::internal::InvalidRTT(),
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typical_network_quality[i].http_rtt());
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DCHECK_EQ(nqe::internal::InvalidRTT(),
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typical_network_quality[i].transport_rtt());
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DCHECK_EQ(nqe::internal::INVALID_RTT_THROUGHPUT,
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typical_network_quality[i].downstream_throughput_kbps());
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}
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typical_network_quality[EFFECTIVE_CONNECTION_TYPE_SLOW_2G] =
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nqe::internal::NetworkQuality(
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// Set to the 77.5th percentile of 2G RTT observations on Android.
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// This corresponds to the median RTT observation when effective
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// connection type is Slow 2G.
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base::TimeDelta::FromMilliseconds(3600),
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base::TimeDelta::FromMilliseconds(3000), 40);
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typical_network_quality[EFFECTIVE_CONNECTION_TYPE_2G] =
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nqe::internal::NetworkQuality(
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// Set to the 58th percentile of 2G RTT observations on Android. This
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// corresponds to the median RTT observation when effective connection
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// type is 2G.
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base::TimeDelta::FromMilliseconds(1800),
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base::TimeDelta::FromMilliseconds(1500), 75);
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typical_network_quality[EFFECTIVE_CONNECTION_TYPE_3G] =
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nqe::internal::NetworkQuality(
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// Set to the 75th percentile of 3G RTT observations on Android. This
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// corresponds to the median RTT observation when effective connection
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// type is 3G.
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base::TimeDelta::FromMilliseconds(450),
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base::TimeDelta::FromMilliseconds(400), 400);
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// Set to the 25th percentile of 3G RTT observations on Android.
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typical_network_quality[EFFECTIVE_CONNECTION_TYPE_4G] =
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nqe::internal::NetworkQuality(base::TimeDelta::FromMilliseconds(175),
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base::TimeDelta::FromMilliseconds(125),
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1600);
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static_assert(
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EFFECTIVE_CONNECTION_TYPE_4G + 1 == EFFECTIVE_CONNECTION_TYPE_LAST,
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"Missing effective connection type");
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}
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// Sets the thresholds for different effective connection types in
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// |connection_thresholds|.
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void ObtainConnectionThresholds(
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const std::map<std::string, std::string>& params,
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nqe::internal::NetworkQuality connection_thresholds[]) {
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// First set the default thresholds.
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nqe::internal::NetworkQuality default_effective_connection_type_thresholds
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[EffectiveConnectionType::EFFECTIVE_CONNECTION_TYPE_LAST];
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DCHECK_LT(base::TimeDelta(), kHttpRttEffectiveConnectionTypeThresholds
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[EFFECTIVE_CONNECTION_TYPE_SLOW_2G]);
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default_effective_connection_type_thresholds
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[EFFECTIVE_CONNECTION_TYPE_SLOW_2G] = nqe::internal::NetworkQuality(
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// Set to the 66th percentile of 2G RTT observations on Android.
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kHttpRttEffectiveConnectionTypeThresholds
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[EFFECTIVE_CONNECTION_TYPE_SLOW_2G],
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nqe::internal::InvalidRTT(), nqe::internal::INVALID_RTT_THROUGHPUT);
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DCHECK_LT(
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base::TimeDelta(),
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kHttpRttEffectiveConnectionTypeThresholds[EFFECTIVE_CONNECTION_TYPE_2G]);
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default_effective_connection_type_thresholds[EFFECTIVE_CONNECTION_TYPE_2G] =
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nqe::internal::NetworkQuality(
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// Set to the 50th percentile of RTT observations on Android.
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kHttpRttEffectiveConnectionTypeThresholds
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[EFFECTIVE_CONNECTION_TYPE_2G],
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nqe::internal::InvalidRTT(), nqe::internal::INVALID_RTT_THROUGHPUT);
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DCHECK_LT(
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base::TimeDelta(),
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kHttpRttEffectiveConnectionTypeThresholds[EFFECTIVE_CONNECTION_TYPE_3G]);
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default_effective_connection_type_thresholds[EFFECTIVE_CONNECTION_TYPE_3G] =
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nqe::internal::NetworkQuality(
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// Set to the 50th percentile of 3G RTT observations on Android.
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kHttpRttEffectiveConnectionTypeThresholds
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[EFFECTIVE_CONNECTION_TYPE_3G],
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nqe::internal::InvalidRTT(), nqe::internal::INVALID_RTT_THROUGHPUT);
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// Connection threshold should not be set for 4G effective connection type
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// since it is the fastest.
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static_assert(
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EFFECTIVE_CONNECTION_TYPE_3G + 1 == EFFECTIVE_CONNECTION_TYPE_4G,
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"Missing effective connection type");
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static_assert(
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EFFECTIVE_CONNECTION_TYPE_4G + 1 == EFFECTIVE_CONNECTION_TYPE_LAST,
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"Missing effective connection type");
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for (size_t i = 0; i <= EFFECTIVE_CONNECTION_TYPE_3G; ++i) {
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EffectiveConnectionType effective_connection_type =
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static_cast<EffectiveConnectionType>(i);
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DCHECK_EQ(nqe::internal::InvalidRTT(), connection_thresholds[i].http_rtt());
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DCHECK_EQ(nqe::internal::InvalidRTT(),
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connection_thresholds[i].transport_rtt());
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DCHECK_EQ(nqe::internal::INVALID_RTT_THROUGHPUT,
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connection_thresholds[i].downstream_throughput_kbps());
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if (effective_connection_type == EFFECTIVE_CONNECTION_TYPE_UNKNOWN)
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continue;
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std::string connection_type_name = std::string(
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DeprecatedGetNameForEffectiveConnectionType(effective_connection_type));
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connection_thresholds[i].set_http_rtt(
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base::TimeDelta::FromMilliseconds(GetValueForVariationParam(
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params, connection_type_name + ".ThresholdMedianHttpRTTMsec",
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default_effective_connection_type_thresholds[i]
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.http_rtt()
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.InMilliseconds())));
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connection_thresholds[i].set_transport_rtt(
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default_effective_connection_type_thresholds[i].transport_rtt());
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connection_thresholds[i].set_downstream_throughput_kbps(
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GetValueForVariationParam(
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params, connection_type_name + ".ThresholdMedianKbps",
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default_effective_connection_type_thresholds[i]
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.downstream_throughput_kbps()));
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DCHECK(i == 0 ||
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connection_thresholds[i].IsFaster(connection_thresholds[i - 1]));
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}
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}
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std::string GetForcedEffectiveConnectionTypeString(
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const std::map<std::string, std::string>& params) {
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return GetStringValueForVariationParamWithDefaultValue(
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params, kForceEffectiveConnectionType, "");
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}
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bool GetForcedEffectiveConnectionTypeOnCellularOnly(
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const std::map<std::string, std::string>& params) {
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return GetForcedEffectiveConnectionTypeString(params) ==
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kEffectiveConnectionTypeSlow2GOnCellular;
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}
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base::Optional<EffectiveConnectionType> GetInitForcedEffectiveConnectionType(
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const std::map<std::string, std::string>& params) {
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if (GetForcedEffectiveConnectionTypeOnCellularOnly(params)) {
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return base::nullopt;
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}
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std::string forced_value = GetForcedEffectiveConnectionTypeString(params);
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base::Optional<EffectiveConnectionType> ect =
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GetEffectiveConnectionTypeForName(forced_value);
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DCHECK(forced_value.empty() || ect);
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return ect;
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}
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} // namespace
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NetworkQualityEstimatorParams::NetworkQualityEstimatorParams(
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const std::map<std::string, std::string>& params)
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: params_(params),
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throughput_min_requests_in_flight_(
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GetValueForVariationParam(params_,
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"throughput_min_requests_in_flight",
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5)),
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throughput_min_transfer_size_kilobytes_(
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GetValueForVariationParam(params_,
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"throughput_min_transfer_size_kilobytes",
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32)),
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throughput_hanging_requests_cwnd_size_multiplier_(
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GetDoubleValueForVariationParamWithDefaultValue(
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params_,
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"throughput_hanging_requests_cwnd_size_multiplier",
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1)),
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weight_multiplier_per_second_(GetWeightMultiplierPerSecond(params_)),
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weight_multiplier_per_signal_strength_level_(
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GetDoubleValueForVariationParamWithDefaultValue(
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params_,
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"rssi_weight_per_signal_strength_level",
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// Set the default value to something less than 1.0. This enables
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// caching of the network quality indexed by signal strength.
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// A value of 1.0 indicates that the signal strength is not used
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// when assigning weight to the observations. A value less than
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// 1.0, but close to 1.0 allows caching of the network quality
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// indexed by signal strength, while not significantly changing
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// the weight of the observations based on signal strength.
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// TODO(tbansal): https://crbug.com/513681: Update this value.
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0.999)),
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forced_effective_connection_type_(
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GetInitForcedEffectiveConnectionType(params_)),
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forced_effective_connection_type_on_cellular_only_(
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GetForcedEffectiveConnectionTypeOnCellularOnly(params_)),
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persistent_cache_reading_enabled_(
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GetPersistentCacheReadingEnabled(params_)),
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min_socket_watcher_notification_interval_(
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GetMinSocketWatcherNotificationInterval(params_)),
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lower_bound_http_rtt_transport_rtt_multiplier_(1.0),
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hanging_request_http_rtt_upper_bound_transport_rtt_multiplier_(
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GetValueForVariationParam(
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params_,
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"hanging_request_http_rtt_upper_bound_transport_rtt_multiplier",
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8)),
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hanging_request_http_rtt_upper_bound_http_rtt_multiplier_(
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GetValueForVariationParam(
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params_,
|
|
"hanging_request_http_rtt_upper_bound_http_rtt_multiplier",
|
|
6)),
|
|
hanging_request_upper_bound_min_http_rtt_(
|
|
base::TimeDelta::FromMilliseconds(GetValueForVariationParam(
|
|
params_,
|
|
"hanging_request_upper_bound_min_http_rtt_msec",
|
|
500))),
|
|
http_rtt_transport_rtt_min_count_(
|
|
GetValueForVariationParam(params_,
|
|
"http_rtt_transport_rtt_min_count",
|
|
5)),
|
|
increase_in_transport_rtt_logging_interval_(
|
|
base::TimeDelta::FromMillisecondsD(
|
|
GetDoubleValueForVariationParamWithDefaultValue(
|
|
params_,
|
|
"increase_in_transport_rtt_logging_interval",
|
|
10000))),
|
|
recent_time_threshold_(base::TimeDelta::FromMillisecondsD(
|
|
GetDoubleValueForVariationParamWithDefaultValue(
|
|
params_,
|
|
"recent_time_threshold",
|
|
5000))),
|
|
historical_time_threshold_(base::TimeDelta::FromMillisecondsD(
|
|
GetDoubleValueForVariationParamWithDefaultValue(
|
|
params_,
|
|
"historical_time_threshold",
|
|
60000))),
|
|
hanging_request_duration_http_rtt_multiplier_(GetValueForVariationParam(
|
|
params_,
|
|
"hanging_request_duration_http_rtt_multiplier",
|
|
5)),
|
|
hanging_request_min_duration_(base::TimeDelta::FromMilliseconds(
|
|
GetValueForVariationParam(params_,
|
|
"hanging_request_min_duration_msec",
|
|
3000))),
|
|
add_default_platform_observations_(
|
|
GetStringValueForVariationParamWithDefaultValue(
|
|
params_,
|
|
"add_default_platform_observations",
|
|
"true") == "true"),
|
|
socket_watchers_min_notification_interval_(
|
|
base::TimeDelta::FromMilliseconds(GetValueForVariationParam(
|
|
params_,
|
|
"socket_watchers_min_notification_interval_msec",
|
|
200))),
|
|
use_small_responses_(false) {
|
|
DCHECK(hanging_request_http_rtt_upper_bound_transport_rtt_multiplier_ == -1 ||
|
|
hanging_request_http_rtt_upper_bound_transport_rtt_multiplier_ > 0);
|
|
DCHECK(hanging_request_http_rtt_upper_bound_http_rtt_multiplier_ == -1 ||
|
|
hanging_request_http_rtt_upper_bound_http_rtt_multiplier_ > 0);
|
|
DCHECK(hanging_request_http_rtt_upper_bound_transport_rtt_multiplier_ == -1 ||
|
|
hanging_request_http_rtt_upper_bound_http_rtt_multiplier_ == -1 ||
|
|
hanging_request_http_rtt_upper_bound_transport_rtt_multiplier_ >=
|
|
hanging_request_http_rtt_upper_bound_http_rtt_multiplier_);
|
|
|
|
DCHECK_GE(1.0, weight_multiplier_per_signal_strength_level_);
|
|
DCHECK_LE(0.0, weight_multiplier_per_signal_strength_level_);
|
|
|
|
ObtainDefaultObservations(params_, default_observations_);
|
|
ObtainTypicalNetworkQualities(params_, typical_network_quality_);
|
|
ObtainConnectionThresholds(params_, connection_thresholds_);
|
|
}
|
|
|
|
NetworkQualityEstimatorParams::~NetworkQualityEstimatorParams() = default;
|
|
|
|
void NetworkQualityEstimatorParams::SetUseSmallResponsesForTesting(
|
|
bool use_small_responses) {
|
|
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
|
|
use_small_responses_ = use_small_responses;
|
|
}
|
|
|
|
bool NetworkQualityEstimatorParams::use_small_responses() const {
|
|
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
|
|
return use_small_responses_;
|
|
};
|
|
|
|
base::Optional<EffectiveConnectionType>
|
|
NetworkQualityEstimatorParams::GetForcedEffectiveConnectionType(
|
|
NetworkChangeNotifier::ConnectionType connection_type) {
|
|
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
|
|
if (forced_effective_connection_type_) {
|
|
return forced_effective_connection_type_;
|
|
}
|
|
|
|
if (forced_effective_connection_type_on_cellular_only_ &&
|
|
net::NetworkChangeNotifier::IsConnectionCellular(connection_type)) {
|
|
return EFFECTIVE_CONNECTION_TYPE_SLOW_2G;
|
|
}
|
|
return base::nullopt;
|
|
}
|
|
|
|
size_t NetworkQualityEstimatorParams::throughput_min_requests_in_flight()
|
|
const {
|
|
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
|
|
|
|
// If |use_small_responses_| is set to true for testing, then consider one
|
|
// request as sufficient for taking throughput sample.
|
|
return use_small_responses_ ? 1 : throughput_min_requests_in_flight_;
|
|
}
|
|
|
|
int64_t NetworkQualityEstimatorParams::GetThroughputMinTransferSizeBits()
|
|
const {
|
|
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
|
|
return static_cast<int64_t>(throughput_min_transfer_size_kilobytes_) * 8 *
|
|
1000;
|
|
}
|
|
|
|
const nqe::internal::NetworkQuality&
|
|
NetworkQualityEstimatorParams::DefaultObservation(
|
|
NetworkChangeNotifier::ConnectionType type) const {
|
|
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
|
|
return default_observations_[type];
|
|
}
|
|
|
|
const nqe::internal::NetworkQuality&
|
|
NetworkQualityEstimatorParams::TypicalNetworkQuality(
|
|
EffectiveConnectionType type) const {
|
|
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
|
|
return typical_network_quality_[type];
|
|
}
|
|
|
|
const nqe::internal::NetworkQuality&
|
|
NetworkQualityEstimatorParams::ConnectionThreshold(
|
|
EffectiveConnectionType type) const {
|
|
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
|
|
return connection_thresholds_[type];
|
|
}
|
|
|
|
} // namespace net
|