go实现Event事件
妙音
posted @ 2021年5月16日 21:12
in golang
, 1106 阅读
描述
go协程之间用通道通信，如何将它改造成事件形式。
需求描述
以下是我的需求
e := NewEvent() //协程1等待结果, 10是等待时间 e.Wait(10) //协程2发送结果 e.Send(xxxx)
原理
原理比较简单，不描述了
示例
package common
import (
"go.uber.org/zap"
"sync"
"time"
)
var NOT_USED interface{} = struct{}{}
func NewEvent() *Event {
e := &Event{
log: zap.S(),
}
e.Reset()
return e
}
type Event struct{
waiters sync.Map
log *zap.SugaredLogger
}
func (e *Event) Wait(timeout time.Duration) interface{}{
ticker := time.NewTicker(time.Second*timeout)
defer ticker.Stop()
resultChan := make(chan interface{}, 1)
e.waiters.Store(resultChan, true)
select{
case result := <- resultChan:
if result == NOT_USED{
return nil
}
return result
case <- ticker.C:
close(resultChan)
}
e.waiters.Delete(resultChan)
return nil
}
func (e *Event) Send(result interface{}){
e.waiters.Range(func(k, v interface{})bool{
resultChan := k.(chan interface{})
select{
case resultChan <- result:
e.waiters.Delete(resultChan)
default:
e.log.Warnf("Event.Send %p resultChan=%d, result=%v", e, len(resultChan), result)
}
return true
})
}
func (e *Event) Reset(){
e.waiters.Range(func(k, v interface{})bool{
resultChan := k.(chan interface{})
resultChan <- NOT_USED
e.waiters.Delete(resultChan)
return true
})
}
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