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package task
import (
"sync"
"time"
)
// Periodic is a task that runs periodically.
type Periodic struct {
// Interval of the task being run
Interval time.Duration
// Execute is the task function
Execute func() error
access sync.Mutex
timer *time.Timer
running bool
}
func (t *Periodic) hasClosed() bool {
t.access.Lock()
defer t.access.Unlock()
return !t.running
}
func (t *Periodic) checkedExecute() error {
if t.hasClosed() {
return nil
}
if err := t.Execute(); err != nil {
t.access.Lock()
t.running = false
t.access.Unlock()
return err
}
t.access.Lock()
defer t.access.Unlock()
if !t.running {
return nil
}
t.timer = time.AfterFunc(t.Interval, func() {
t.checkedExecute()
})
return nil
}
// Start implements common.Runnable.
func (t *Periodic) Start() error {
t.access.Lock()
if t.running {
t.access.Unlock()
return nil
}
t.running = true
t.access.Unlock()
if err := t.checkedExecute(); err != nil {
t.access.Lock()
t.running = false
t.access.Unlock()
return err
}
return nil
}
// Close implements common.Closable.
func (t *Periodic) Close() error {
t.access.Lock()
defer t.access.Unlock()
t.running = false
if t.timer != nil {
t.timer.Stop()
t.timer = nil
}
return nil
}
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