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interval_runner.go
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/
interval_runner.go
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package radar
import (
"os"
"time"
"code.cloudfoundry.org/clock"
"code.cloudfoundry.org/lager"
)
type IntervalRunner struct {
logger lager.Logger
clock clock.Clock
name string
scanner Scanner
}
func NewIntervalRunner(
logger lager.Logger,
clock clock.Clock,
name string,
scanner Scanner,
) *IntervalRunner {
return &IntervalRunner{
logger: logger,
clock: clock,
name: name,
scanner: scanner,
}
}
func (r *IntervalRunner) RunFunc(signals <-chan os.Signal, ready chan<- struct{}) error {
// do an immediate initial check
var interval time.Duration = 0
close(ready)
for {
timer := r.clock.NewTimer(interval)
select {
case <-signals:
timer.Stop()
return nil
case <-timer.C():
var err error
interval, err = r.scanner.Run(r.logger, r.name)
if err != nil {
if err == ErrFailedToAcquireLock {
break
}
return err
}
}
}
}