Remove //net (except for Android test stuff) and sdch

net/quic/congestion_control/rtt_stats.h

-// 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 <algorithm>
-
-#include "base/basictypes.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();
-
-  // Returns true if any RTT measurements have been made.
-  bool HasUpdates() const;
-
-  // 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 recent min rtt within the next
-  // |num_samples| UpdateRtt calls.
-  void SampleNewRecentMinRtt(uint32 num_samples);
-
-  // 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_;
-  }
-
-  int64 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 initial_rtt_us) {
-    if (initial_rtt_us <= 0) {
-      LOG(DFATAL) << "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_;
-  }
-
-  // Returns the min_rtt since SampleNewRecentMinRtt has been called, or the
-  // min_rtt for the entire connection if SampleNewMinRtt was never called.
-  QuicTime::Delta recent_min_rtt() const {
-    return recent_min_rtt_.rtt;
-  }
-
-  QuicTime::Delta mean_deviation() const {
-    return mean_deviation_;
-  }
-
-  // Sets how old a recent min rtt sample can be.
-  void set_recent_min_rtt_window(QuicTime::Delta recent_min_rtt_window) {
-    recent_min_rtt_window_ = recent_min_rtt_window;
-  }
-
- private:
-  friend class test::RttStatsPeer;
-
-  // Used to track a sampled RTT window.
-  struct RttSample {
-    RttSample() : rtt(QuicTime::Delta::Zero()), time(QuicTime::Zero()) { }
-    RttSample(QuicTime::Delta rtt, QuicTime time) : rtt(rtt), time(time) { }
-
-    QuicTime::Delta rtt;
-    QuicTime time;  // Time the rtt sample was recorded.
-  };
-
-  // Implements the resampling algorithm and the windowed min rtt algorithm.
-  void UpdateRecentMinRtt(QuicTime::Delta rtt_sample, QuicTime now);
-
-  QuicTime::Delta latest_rtt_;
-  QuicTime::Delta min_rtt_;
-  QuicTime::Delta smoothed_rtt_;
-  // 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 initial_rtt_us_;
-
-  RttSample new_min_rtt_;
-  uint32 num_min_rtt_samples_remaining_;
-
-  // State variables for Kathleen Nichols MinRTT algorithm.
-  QuicTime::Delta recent_min_rtt_window_;
-  RttSample recent_min_rtt_;  // a in the windowed algorithm.
-  RttSample half_window_rtt_;  // b in the sampled algorithm.
-  RttSample quarter_window_rtt_;  // c in the sampled algorithm.
-
-  DISALLOW_COPY_AND_ASSIGN(RttStats);
-};
-
-}  // namespace net
-
-#endif  // NET_QUIC_CONGESTION_CONTROL_RTT_STATS_H_