net/quic/congestion_control/paced_sender.h

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4 //
   5 // Helper class that limits the congestion window to pace the packets.
   6
   7 #ifndef NET_QUIC_CONGESTION_CONTROL_PACED_SENDER_H_
   8 #define NET_QUIC_CONGESTION_CONTROL_PACED_SENDER_H_
   9
  10 #include "base/basictypes.h"
  11 #include "net/base/net_export.h"
  12 #include "net/quic/congestion_control/leaky_bucket.h"
  13 #include "net/quic/quic_bandwidth.h"
  14 #include "net/quic/quic_time.h"
  15
  16 namespace net {
  17
  18 class NET_EXPORT_PRIVATE PacedSender {
  19  public:
  20   PacedSender(QuicBandwidth bandwidth_estimate, QuicByteCount max_segment_size);
  21
  22   void set_max_segment_size(QuicByteCount max_segment_size);
  23
  24   // The estimated bandidth from the congestion algorithm changed.
  25   void UpdateBandwidthEstimate(QuicTime now, QuicBandwidth bandwidth_estimate);
  26
  27   // A packet of size bytes was sent.
  28   void OnPacketSent(QuicTime now, QuicByteCount bytes);
  29
  30   // Return time until we can send based on the pacing.
  31   QuicTime::Delta TimeUntilSend(QuicTime now, QuicTime::Delta time_until_send);
  32
  33  private:
  34   // Helper object to track the rate data can leave the buffer for pacing.
  35   LeakyBucket leaky_bucket_;
  36   QuicBandwidth pace_;
  37   QuicByteCount max_segment_size_;
  38
  39   DISALLOW_COPY_AND_ASSIGN(PacedSender);
  40 };
  41
  42 }  // namespace net
  43
  44 #endif  // NET_QUIC_CONGESTION_CONTROL_PACED_SENDER_H_