| // Copyright 2016 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 NET_NQE_NETWORK_QUALITY_H_ |
| #define NET_NQE_NETWORK_QUALITY_H_ |
| |
| #include <stdint.h> |
| |
| #include "base/gtest_prod_util.h" |
| #include "base/macros.h" |
| #include "base/sequence_checker.h" |
| #include "base/time/time.h" |
| #include "net/base/net_export.h" |
| |
| namespace net { |
| namespace nqe { |
| namespace internal { |
| |
| // RTT and throughput values are set to |INVALID_RTT_THROUGHPUT| if a valid |
| // value is unavailable. |
| // GENERATED_JAVA_ENUM_PACKAGE: org.chromium.net |
| enum RttThroughputValues { |
| // Invalid value. |
| INVALID_RTT_THROUGHPUT = -1, |
| }; |
| |
| // Returns the RTT value to be used when the valid RTT is unavailable. Readers |
| // should discard RTT if it is set to the value returned by |InvalidRTT()|. |
| // TODO(tbansal): Remove this method, and replace all calls by |
| // |INVALID_RTT_THROUGHPUT|. |
| NET_EXPORT_PRIVATE base::TimeDelta InvalidRTT(); |
| |
| // NetworkQuality is used to cache the quality of a network connection. |
| class NET_EXPORT_PRIVATE NetworkQuality { |
| public: |
| NetworkQuality(); |
| // |http_rtt| is the estimate of the round trip time at the HTTP layer. |
| // |transport_rtt| is the estimate of the round trip time at the transport |
| // layer. |downstream_throughput_kbps| is the estimate of the downstream |
| // throughput in kilobits per second. |
| NetworkQuality(const base::TimeDelta& http_rtt, |
| const base::TimeDelta& transport_rtt, |
| int32_t downstream_throughput_kbps); |
| NetworkQuality(const NetworkQuality& other); |
| ~NetworkQuality(); |
| |
| NetworkQuality& operator=(const NetworkQuality& other); |
| |
| bool operator==(const NetworkQuality& other) const; |
| |
| // Returns true if |this| is at least as fast as |other| for all parameters |
| // (HTTP RTT, transport RTT etc.) |
| bool IsFaster(const NetworkQuality& other) const; |
| |
| // Returns the estimate of the round trip time at the HTTP layer. |
| const base::TimeDelta& http_rtt() const { |
| DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_); |
| return http_rtt_; |
| } |
| |
| void set_http_rtt(base::TimeDelta http_rtt) { |
| DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_); |
| http_rtt_ = http_rtt; |
| DCHECK_LE(INVALID_RTT_THROUGHPUT, http_rtt_.InMilliseconds()); |
| } |
| |
| // Returns the estimate of the round trip time at the transport layer. |
| const base::TimeDelta& transport_rtt() const { |
| DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_); |
| return transport_rtt_; |
| } |
| |
| void set_transport_rtt(base::TimeDelta transport_rtt) { |
| DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_); |
| transport_rtt_ = transport_rtt; |
| DCHECK_LE(INVALID_RTT_THROUGHPUT, transport_rtt_.InMilliseconds()); |
| } |
| |
| // Returns the estimate of the downstream throughput in Kbps (Kilobits per |
| // second). |
| int32_t downstream_throughput_kbps() const { |
| DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_); |
| return downstream_throughput_kbps_; |
| } |
| |
| void set_downstream_throughput_kbps(int32_t downstream_throughput_kbps) { |
| DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_); |
| downstream_throughput_kbps_ = downstream_throughput_kbps; |
| DCHECK_LE(INVALID_RTT_THROUGHPUT, downstream_throughput_kbps_); |
| } |
| |
| private: |
| // Verifies that the value of network quality is within the expected range. |
| void VerifyValueCorrectness() const; |
| |
| // Estimated round trip time at the HTTP layer. |
| base::TimeDelta http_rtt_; |
| |
| // Estimated round trip time at the transport layer. |
| base::TimeDelta transport_rtt_; |
| |
| // Estimated downstream throughput in kilobits per second. |
| int32_t downstream_throughput_kbps_; |
| |
| SEQUENCE_CHECKER(sequence_checker_); |
| }; |
| |
| } // namespace internal |
| } // namespace nqe |
| } // namespace net |
| |
| #endif // NET_NQE_NETWORK_QUALITY_H_ |