1// Copyright 2016 The go-ethereum Authors
2// This file is part of the go-ethereum library.
3//
4// The go-ethereum library is free software: you can redistribute it and/or modify
5// it under the terms of the GNU Lesser General Public License as published by
6// the Free Software Foundation, either version 3 of the License, or
7// (at your option) any later version.
8//
9// The go-ethereum library is distributed in the hope that it will be useful,
10// but WITHOUT ANY WARRANTY; without even the implied warranty of
11// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12// GNU Lesser General Public License for more details.
13//
14// You should have received a copy of the GNU Lesser General Public License
15// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
16
17// Package mclock is a wrapper for a monotonic clock source
18package mclock
19
20import (
21	"time"
22
23	"github.com/aristanetworks/goarista/monotime"
24)
25
26// AbsTime represents absolute monotonic time.
27type AbsTime time.Duration
28
29// Now returns the current absolute monotonic time.
30func Now() AbsTime {
31	return AbsTime(monotime.Now())
32}
33
34// Add returns t + d.
35func (t AbsTime) Add(d time.Duration) AbsTime {
36	return t + AbsTime(d)
37}
38
39// Clock interface makes it possible to replace the monotonic system clock with
40// a simulated clock.
41type Clock interface {
42	Now() AbsTime
43	Sleep(time.Duration)
44	After(time.Duration) <-chan time.Time
45}
46
47// System implements Clock using the system clock.
48type System struct{}
49
50// Now implements Clock.
51func (System) Now() AbsTime {
52	return AbsTime(monotime.Now())
53}
54
55// Sleep implements Clock.
56func (System) Sleep(d time.Duration) {
57	time.Sleep(d)
58}
59
60// After implements Clock.
61func (System) After(d time.Duration) <-chan time.Time {
62	return time.After(d)
63}
64