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timer.go
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timer.go
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// Copyright 2021 The PlatON Network Authors
// This file is part of the PlatON-Go library.
//
// The PlatON-Go 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 PlatON-Go 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 PlatON-Go library. If not, see <http://www.gnu.org/licenses/>.
package state
import (
"math"
"time"
)
const (
exponentBase = float64(1.5)
maxExponent = 2
)
type viewTimer struct {
//Timer last timeout
deadline time.Time
timer *time.Timer
//Time window length calculation module
timeInterval viewTimeInterval
preViewInterval uint64
}
func newViewTimer(period uint64) *viewTimer {
timer := time.NewTimer(0)
timer.Stop()
return &viewTimer{timer: timer,
timeInterval: viewTimeInterval{baseMs: period * uint64(time.Millisecond), exponentBase: exponentBase, maxExponent: maxExponent},
preViewInterval: 1,
}
}
// Ensure that the timeout period is adjusted smoothly.
// Each time the adjustment is compared with the previous one, it is gradually lower than the previous one, and then gradually decreases.
func (t *viewTimer) calViewInterval(viewInterval uint64) uint64 {
if t.preViewInterval > 1 && viewInterval == 1 || t.preViewInterval > viewInterval {
viewInterval = t.preViewInterval - 1
} else if t.preViewInterval != 1 && t.preViewInterval == viewInterval {
viewInterval += 1
}
t.preViewInterval = viewInterval
return viewInterval
}
func (t *viewTimer) setupTimer(viewInterval uint64) {
viewInterval = t.calViewInterval(viewInterval)
duration := t.timeInterval.getViewTimeInterval(viewInterval)
t.deadline = time.Now().Add(duration)
t.stopTimer()
t.timer.Reset(duration)
}
func (t *viewTimer) stopTimer() {
if !t.timer.Stop() {
select {
case <-t.timer.C:
default:
}
}
}
func (t *viewTimer) timerChan() <-chan time.Time {
return t.timer.C
}
func (t viewTimer) isDeadline() bool {
return t.deadline.Before(time.Now())
}
// Calculate the time window of each view,time=b*e^m
type viewTimeInterval struct {
baseMs uint64
exponentBase float64
maxExponent uint64
}
func (vt viewTimeInterval) getViewTimeInterval(viewInterval uint64) time.Duration {
pow := viewInterval - 1
if pow > vt.maxExponent {
pow = vt.maxExponent
}
mul := math.Pow(vt.exponentBase, float64(pow))
return time.Duration(uint64(float64(vt.baseMs) * mul))
}