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69 lines
1.8 KiB
69 lines
1.8 KiB
// Copyright 2020 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package utils
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import (
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"sync"
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"time"
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"github.com/ethereum/go-ethereum/common/mclock"
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)
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type UpdateTimer struct {
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clock mclock.Clock
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lock sync.Mutex
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last mclock.AbsTime
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threshold time.Duration
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}
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func NewUpdateTimer(clock mclock.Clock, threshold time.Duration) *UpdateTimer {
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// We don't accept the update threshold less than 0.
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if threshold < 0 {
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return nil
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}
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// Don't panic for lazy users
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if clock == nil {
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clock = mclock.System{}
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}
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return &UpdateTimer{
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clock: clock,
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last: clock.Now(),
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threshold: threshold,
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}
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}
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func (t *UpdateTimer) Update(callback func(diff time.Duration) bool) bool {
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return t.UpdateAt(t.clock.Now(), callback)
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}
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func (t *UpdateTimer) UpdateAt(at mclock.AbsTime, callback func(diff time.Duration) bool) bool {
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t.lock.Lock()
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defer t.lock.Unlock()
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diff := time.Duration(at - t.last)
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if diff < 0 {
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diff = 0
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}
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if diff < t.threshold {
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return false
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}
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if callback(diff) {
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t.last = at
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return true
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}
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return false
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}
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