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// Copyright 2014 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.
#include "quic/core/quic_sustained_bandwidth_recorder.h"
#include "quic/core/quic_bandwidth.h"
#include "quic/core/quic_time.h"
#include "quic/platform/api/quic_logging.h"
namespace quic {
QuicSustainedBandwidthRecorder::QuicSustainedBandwidthRecorder()
: has_estimate_(false),
is_recording_(false),
bandwidth_estimate_recorded_during_slow_start_(false),
bandwidth_estimate_(QuicBandwidth::Zero()),
max_bandwidth_estimate_(QuicBandwidth::Zero()),
max_bandwidth_timestamp_(0),
start_time_(QuicTime::Zero()) {}
void QuicSustainedBandwidthRecorder::RecordEstimate(bool in_recovery,
bool in_slow_start,
QuicBandwidth bandwidth,
QuicTime estimate_time,
QuicWallTime wall_time,
QuicTime::Delta srtt) {
if (in_recovery) {
is_recording_ = false;
QUIC_DVLOG(1) << "Stopped recording at: "
<< estimate_time.ToDebuggingValue();
return;
}
if (!is_recording_) {
// This is the first estimate of a new recording period.
start_time_ = estimate_time;
is_recording_ = true;
QUIC_DVLOG(1) << "Started recording at: " << start_time_.ToDebuggingValue();
return;
}
// If we have been recording for at least 3 * srtt, then record the latest
// bandwidth estimate as a valid sustained bandwidth estimate.
if (estimate_time - start_time_ >= 3 * srtt) {
has_estimate_ = true;
bandwidth_estimate_recorded_during_slow_start_ = in_slow_start;
bandwidth_estimate_ = bandwidth;
QUIC_DVLOG(1) << "New sustained bandwidth estimate (KBytes/s): "
<< bandwidth_estimate_.ToKBytesPerSecond();
}
// Check for an increase in max bandwidth.
if (bandwidth > max_bandwidth_estimate_) {
max_bandwidth_estimate_ = bandwidth;
max_bandwidth_timestamp_ = wall_time.ToUNIXSeconds();
QUIC_DVLOG(1) << "New max bandwidth estimate (KBytes/s): "
<< max_bandwidth_estimate_.ToKBytesPerSecond();
}
}
} // namespace quic
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