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// Copyright 2020 PingCAP, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// See the License for the specific language governing permissions and
// limitations under the License.
package progress
import (
"time"
"go.uber.org/atomic"
)
type renderer struct {
isUpdaterRunning atomic.Bool
stopChan chan struct{}
stopFinishedChan chan struct{}
renderFn func()
}
func newRenderer() *renderer {
return &renderer{
isUpdaterRunning: atomic.Bool{},
stopChan: nil,
stopFinishedChan: nil,
renderFn: nil,
}
}
func (r *renderer) startRenderLoop() {
if r.renderFn == nil {
panic("renderFn must be set")
}
if !r.isUpdaterRunning.CompareAndSwap(false, true) {
return
}
r.stopChan = make(chan struct{})
r.stopFinishedChan = make(chan struct{})
go r.renderLoopFn()
}
func (r *renderer) stopRenderLoop() {
if !r.isUpdaterRunning.CompareAndSwap(true, false) {
return
}
r.stopChan <- struct{}{}
close(r.stopChan)
r.stopChan = nil
<-r.stopFinishedChan
close(r.stopFinishedChan)
r.stopFinishedChan = nil
}
func (r *renderer) renderLoopFn() {
ticker := time.NewTicker(refreshRate)
defer ticker.Stop()
for {
select {
case <-ticker.C:
r.renderFn()
case <-r.stopChan:
r.renderFn()
r.stopFinishedChan <- struct{}{}
return
}
}
}
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