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114 lines
3.7 KiB
C++
114 lines
3.7 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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#ifndef NET_NQE_NETWORK_QUALITY_H_
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#define NET_NQE_NETWORK_QUALITY_H_
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#include <stdint.h>
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#include "base/gtest_prod_util.h"
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#include "base/macros.h"
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#include "base/sequence_checker.h"
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#include "base/time/time.h"
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#include "net/base/net_export.h"
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namespace net {
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namespace nqe {
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namespace internal {
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// RTT and throughput values are set to |INVALID_RTT_THROUGHPUT| if a valid
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// value is unavailable.
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// GENERATED_JAVA_ENUM_PACKAGE: org.chromium.net
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enum RttThroughputValues {
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// Invalid value.
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INVALID_RTT_THROUGHPUT = -1,
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};
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// Returns the RTT value to be used when the valid RTT is unavailable. Readers
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// should discard RTT if it is set to the value returned by |InvalidRTT()|.
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// TODO(tbansal): Remove this method, and replace all calls by
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// |INVALID_RTT_THROUGHPUT|.
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NET_EXPORT_PRIVATE base::TimeDelta InvalidRTT();
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// NetworkQuality is used to cache the quality of a network connection.
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class NET_EXPORT_PRIVATE NetworkQuality {
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public:
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NetworkQuality();
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// |http_rtt| is the estimate of the round trip time at the HTTP layer.
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// |transport_rtt| is the estimate of the round trip time at the transport
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// layer. |downstream_throughput_kbps| is the estimate of the downstream
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// throughput in kilobits per second.
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NetworkQuality(const base::TimeDelta& http_rtt,
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const base::TimeDelta& transport_rtt,
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int32_t downstream_throughput_kbps);
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NetworkQuality(const NetworkQuality& other);
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~NetworkQuality();
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NetworkQuality& operator=(const NetworkQuality& other);
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bool operator==(const NetworkQuality& other) const;
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// Returns true if |this| is at least as fast as |other| for all parameters
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// (HTTP RTT, transport RTT etc.)
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bool IsFaster(const NetworkQuality& other) const;
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// Returns the estimate of the round trip time at the HTTP layer.
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const base::TimeDelta& http_rtt() const {
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DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
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return http_rtt_;
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}
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void set_http_rtt(base::TimeDelta http_rtt) {
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DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
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http_rtt_ = http_rtt;
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DCHECK_LE(INVALID_RTT_THROUGHPUT, http_rtt_.InMilliseconds());
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}
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// Returns the estimate of the round trip time at the transport layer.
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const base::TimeDelta& transport_rtt() const {
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DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
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return transport_rtt_;
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}
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void set_transport_rtt(base::TimeDelta transport_rtt) {
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DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
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transport_rtt_ = transport_rtt;
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DCHECK_LE(INVALID_RTT_THROUGHPUT, transport_rtt_.InMilliseconds());
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}
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// Returns the estimate of the downstream throughput in Kbps (Kilobits per
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// second).
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int32_t downstream_throughput_kbps() const {
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DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
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return downstream_throughput_kbps_;
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}
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void set_downstream_throughput_kbps(int32_t downstream_throughput_kbps) {
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DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
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downstream_throughput_kbps_ = downstream_throughput_kbps;
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DCHECK_LE(INVALID_RTT_THROUGHPUT, downstream_throughput_kbps_);
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}
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private:
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// Verifies that the value of network quality is within the expected range.
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void VerifyValueCorrectness() const;
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// Estimated round trip time at the HTTP layer.
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base::TimeDelta http_rtt_;
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// Estimated round trip time at the transport layer.
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base::TimeDelta transport_rtt_;
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// Estimated downstream throughput in kilobits per second.
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int32_t downstream_throughput_kbps_;
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SEQUENCE_CHECKER(sequence_checker_);
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};
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} // namespace internal
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} // namespace nqe
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} // namespace net
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#endif // NET_NQE_NETWORK_QUALITY_H_
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