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// Copyright 2016 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
// Package mclock is a wrapper for a monotonic clock source
package mclock
import (
"time"
"github.com/aristanetworks/goarista/monotime"
)
// AbsTime represents absolute monotonic time.
type AbsTime time.Duration
// Now returns the current absolute monotonic time.
func Now() AbsTime {
return AbsTime(monotime.Now())
}
// Add returns t + d.
func (t AbsTime) Add(d time.Duration) AbsTime {
return t + AbsTime(d)
}
// Clock interface makes it possible to replace the monotonic system clock with
// a simulated clock.
type Clock interface {
Now() AbsTime
Sleep(time.Duration)
After(time.Duration) <-chan time.Time
AfterFunc(d time.Duration, f func()) Event
}
// Event represents a cancellable event returned by AfterFunc
type Event interface {
Cancel() bool
}
// System implements Clock using the system clock.
type System struct{}
// Now implements Clock.
func (System) Now() AbsTime {
return AbsTime(monotime.Now())
}
// Sleep implements Clock.
func (System) Sleep(d time.Duration) {
time.Sleep(d)
}
// After implements Clock.
func (System) After(d time.Duration) <-chan time.Time {
return time.After(d)
}
// AfterFunc implements Clock.
func (System) AfterFunc(d time.Duration, f func()) Event {
return (*SystemEvent)(time.AfterFunc(d, f))
}
// SystemEvent implements Event using time.Timer.
type SystemEvent time.Timer
// Cancel implements Event.
func (e *SystemEvent) Cancel() bool {
return (*time.Timer)(e).Stop()
}
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