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// 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_
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