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// Copyright (c) 2012 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.
//
// Helper class that limits the congestion window to pace the packets.
#ifndef NET_QUIC_CONGESTION_CONTROL_PACED_SENDER_H_
#define NET_QUIC_CONGESTION_CONTROL_PACED_SENDER_H_
#include "base/basictypes.h"
#include "net/base/net_export.h"
#include "net/quic/congestion_control/leaky_bucket.h"
#include "net/quic/quic_bandwidth.h"
#include "net/quic/quic_time.h"
namespace net {
class NET_EXPORT_PRIVATE PacedSender {
public:
PacedSender(QuicBandwidth bandwidth_estimate, QuicByteCount max_segment_size);
void set_max_segment_size(QuicByteCount max_segment_size);
// The estimated bandidth from the congestion algorithm changed.
void UpdateBandwidthEstimate(QuicTime now, QuicBandwidth bandwidth_estimate);
// A packet of size bytes was sent.
void OnPacketSent(QuicTime now, QuicByteCount bytes);
// Return time until we can send based on the pacing.
QuicTime::Delta TimeUntilSend(QuicTime now, QuicTime::Delta time_until_send);
private:
// Helper object to track the rate data can leave the buffer for pacing.
LeakyBucket leaky_bucket_;
QuicBandwidth pace_;
QuicByteCount max_segment_size_;
DISALLOW_COPY_AND_ASSIGN(PacedSender);
};
} // namespace net
#endif // NET_QUIC_CONGESTION_CONTROL_PACED_SENDER_H_
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