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// Copyright 2020 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 utils
import (
"sync"
"time"
"github.com/ethereum/go-ethereum/common/mclock"
)
type UpdateTimer struct {
clock mclock.Clock
lock sync.Mutex
last mclock.AbsTime
threshold time.Duration
}
func NewUpdateTimer(clock mclock.Clock, threshold time.Duration) *UpdateTimer {
// We don't accept the update threshold less than 0.
if threshold < 0 {
return nil
}
// Don't panic for lazy users
if clock == nil {
clock = mclock.System{}
}
return &UpdateTimer{
clock: clock,
last: clock.Now(),
threshold: threshold,
}
}
func (t *UpdateTimer) Update(callback func(diff time.Duration) bool) bool {
return t.UpdateAt(t.clock.Now(), callback)
}
func (t *UpdateTimer) UpdateAt(at mclock.AbsTime, callback func(diff time.Duration) bool) bool {
t.lock.Lock()
defer t.lock.Unlock()
diff := time.Duration(at - t.last)
if diff < 0 {
diff = 0
}
if diff < t.threshold {
return false
}
if callback(diff) {
t.last = at
return true
}
return false
}