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#ifndef NET_QUIC_QUIC_CLOCK_H_
6#define NET_QUIC_QUIC_CLOCK_H_
7
8#include "base/basictypes.h"
9#include "net/base/net_export.h"
10#include "net/quic/quic_time.h"
11
12namespace net {
13
14typedef double WallTime;
15
16// Clock to efficiently retrieve an approximately accurate time from an
17// EpollServer.
18class NET_EXPORT_PRIVATE QuicClock {
19 public:
20  QuicClock();
21  virtual ~QuicClock();
22
23  // Returns the approximate current time as a QuicTime object.
24  virtual QuicTime ApproximateNow() const;
25
26  // Returns the current time as a QuicTime object.
27  // Note: this use significant resources please use only if needed.
28  virtual QuicTime Now() const;
29
30  // WallNow returns the current wall-time - a time that is consistent across
31  // different clocks.
32  virtual QuicWallTime WallNow() const;
33
34 private:
35  DISALLOW_COPY_AND_ASSIGN(QuicClock);
36};
37
38}  // namespace net
39
40#endif  // NET_QUIC_QUIC_CLOCK_H_
41