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Unified Diff: net/quic/congestion_control/rtt_stats.h

Issue 2193073003: Move shared files in net/quic/ into net/quic/core/ (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@master
Patch Set: io_thread_unittest.cc Created 4 years, 5 months ago
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Index: net/quic/congestion_control/rtt_stats.h
diff --git a/net/quic/congestion_control/rtt_stats.h b/net/quic/congestion_control/rtt_stats.h
deleted file mode 100644
index 009f07ec1057d91e02cd787d8d5875f0cc435ee0..0000000000000000000000000000000000000000
--- a/net/quic/congestion_control/rtt_stats.h
+++ /dev/null
@@ -1,113 +0,0 @@
-// 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.
-//
-// A convenience class to store rtt samples and calculate smoothed rtt.
-
-#ifndef NET_QUIC_CONGESTION_CONTROL_RTT_STATS_H_
-#define NET_QUIC_CONGESTION_CONTROL_RTT_STATS_H_
-
-#include <stdint.h>
-
-#include <algorithm>
-
-#include "base/macros.h"
-#include "net/quic/congestion_control/windowed_filter.h"
-#include "net/quic/quic_bug_tracker.h"
-#include "net/quic/quic_protocol.h"
-#include "net/quic/quic_time.h"
-
-namespace net {
-
-namespace test {
-class RttStatsPeer;
-} // namespace test
-
-class NET_EXPORT_PRIVATE RttStats {
- public:
- RttStats();
-
- // Updates the RTT from an incoming ack which is received |send_delta| after
- // the packet is sent and the peer reports the ack being delayed |ack_delay|.
- void UpdateRtt(QuicTime::Delta send_delta,
- QuicTime::Delta ack_delay,
- QuicTime now);
-
- // Causes the smoothed_rtt to be increased to the latest_rtt if the latest_rtt
- // is larger. The mean deviation is increased to the most recent deviation if
- // it's larger.
- void ExpireSmoothedMetrics();
-
- // Forces RttStats to sample a new windowed min rtt within the next
- // |num_samples| UpdateRtt calls.
- void SampleNewWindowedMinRtt(uint32_t num_samples);
-
- // Called when connection migrates and rtt measurement needs to be reset.
- void OnConnectionMigration();
-
- // Returns the EWMA smoothed RTT for the connection.
- // May return Zero if no valid updates have occurred.
- QuicTime::Delta smoothed_rtt() const { return smoothed_rtt_; }
-
- // Returns the EWMA smoothed RTT prior to the most recent RTT sample.
- QuicTime::Delta previous_srtt() const { return previous_srtt_; }
-
- int64_t initial_rtt_us() const { return initial_rtt_us_; }
-
- // Sets an initial RTT to be used for SmoothedRtt before any RTT updates.
- void set_initial_rtt_us(int64_t initial_rtt_us) {
- if (initial_rtt_us <= 0) {
- QUIC_BUG << "Attempt to set initial rtt to <= 0.";
- return;
- }
- initial_rtt_us_ = initial_rtt_us;
- }
-
- // The most recent rtt measurement.
- // May return Zero if no valid updates have occurred.
- QuicTime::Delta latest_rtt() const { return latest_rtt_; }
-
- // Returns the min_rtt for the entire connection.
- // May return Zero if no valid updates have occurred.
- QuicTime::Delta min_rtt() const { return min_rtt_; }
-
- QuicTime::Delta mean_deviation() const { return mean_deviation_; }
-
- QuicTime::Delta WindowedMinRtt() { return windowed_min_rtt_.GetBest(); }
-
- private:
- friend class test::RttStatsPeer;
-
- // Updates the windowed min rtt. Also forces a new windowed_min_rtt sample,
- // if set by a call to SampleNewWindowedMinRtt() above.
- void UpdateWindowedMinRtt(QuicTime::Delta rtt_sample, QuicTime now);
-
- QuicTime::Delta latest_rtt_;
- QuicTime::Delta min_rtt_;
- QuicTime::Delta smoothed_rtt_;
- QuicTime::Delta previous_srtt_;
- // Mean RTT deviation during this session.
- // Approximation of standard deviation, the error is roughly 1.25 times
- // larger than the standard deviation, for a normally distributed signal.
- QuicTime::Delta mean_deviation_;
- int64_t initial_rtt_us_;
-
- // Variables used to force a new windowed_min_rtt measurement within
- // num_samples_for_forced_min_.
- QuicTime::Delta forced_windowed_min_rtt_;
- QuicTime forced_windowed_min_rtt_time_;
- uint32_t num_samples_for_forced_min_;
-
- // Windowed min_rtt.
- WindowedFilter<QuicTime::Delta,
- MinFilter<QuicTime::Delta>,
- QuicTime,
- QuicTime::Delta>
- windowed_min_rtt_;
-
- DISALLOW_COPY_AND_ASSIGN(RttStats);
-};
-
-} // namespace net
-
-#endif // NET_QUIC_CONGESTION_CONTROL_RTT_STATS_H_
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