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statuser.go
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statuser.go
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/*
© 2022–present Harald Rudell <harald.rudell@gmail.com> (https://haraldrudell.github.io/haraldrudell/)
ISC License
*/
package threadprof
import (
"fmt"
"sync"
"time"
"github.com/haraldrudell/parl"
)
const (
stInitial = "no status"
stTime = 10 * time.Second
)
type StatuserOn struct {
lock sync.Mutex
status string
t time.Timer
can chan struct{}
shLock sync.Once
}
func newStatuser(d time.Duration) (st *StatuserOn) {
if d == 0 {
d = stTime
}
s := StatuserOn{
status: stInitial,
t: *time.NewTimer(d),
can: make(chan struct{}),
}
go s.trigThread()
return &s
}
func (st *StatuserOn) Set(status string) (statuser parl.Statuser) {
st.lock.Lock()
defer st.lock.Unlock()
st.status = status
return st
}
func (st *StatuserOn) Shutdown() {
st.shLock.Do(func() {
close(st.can)
})
}
func (st *StatuserOn) trigThread() {
for {
select {
case <-st.t.C:
fmt.Printf("### %s", st.getStatus())
case <-st.can:
st.t.Stop()
}
}
}
func (st *StatuserOn) getStatus() (s string) {
st.lock.Lock()
defer st.lock.Unlock()
return st.status
}