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package workloadapi
import (
"math"
"time"
)
// BackoffStrategy provides backoff facilities.
type BackoffStrategy interface {
// NewBackoff returns a new backoff for the strategy. The returned
// Backoff is in the same state that it would be in after a call to
// Reset().
NewBackoff() Backoff
}
// Backoff provides backoff for a workload API operation.
type Backoff interface {
// Next returns the next backoff period.
Next() time.Duration
// Reset() resets the backoff.
Reset()
}
type defaultBackoffStrategy struct{}
func (defaultBackoffStrategy) NewBackoff() Backoff {
return newLinearBackoff()
}
// linearBackoff defines an linear backoff policy.
type linearBackoff struct {
initialDelay time.Duration
maxDelay time.Duration
n int
}
func newLinearBackoff() *linearBackoff {
return &linearBackoff{
initialDelay: time.Second,
maxDelay: 30 * time.Second,
n: 0,
}
}
func (b *linearBackoff) Next() time.Duration {
backoff := float64(b.n) + 1
d := math.Min(b.initialDelay.Seconds()*backoff, b.maxDelay.Seconds())
b.n++
return time.Duration(d) * time.Second
}
func (b *linearBackoff) Reset() {
b.n = 0
}
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