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// _ _
// __ _____ __ ___ ___ __ _| |_ ___
// \ \ /\ / / _ \/ _` \ \ / / |/ _` | __/ _ \
// \ V V / __/ (_| |\ V /| | (_| | || __/
// \_/\_/ \___|\__,_| \_/ |_|\__,_|\__\___|
//
// Copyright © 2016 - 2024 Weaviate B.V. All rights reserved.
//
// CONTACT: [email protected]
//
package interval
import (
"sort"
"time"
)
var defaultBackoffs = []time.Duration{
time.Duration(0),
30 * time.Second,
2 * time.Minute,
10 * time.Minute,
1 * time.Hour,
12 * time.Hour,
}
// BackoffTimer tracks a given range of intervals with increasing duration
type BackoffTimer struct {
backoffLevel int
backoffs []time.Duration
lastInterval time.Time
}
// NewBackoffTimer constructs and returns a *BackoffTimer instance
// If no backoffs are provided, defaultBackoffs is used. When the
// last backoff duration has elapsed, the timer will use the final
// duration for the remainder of the BackoffTimer's lifetime
func NewBackoffTimer(backoffs ...time.Duration) *BackoffTimer {
boff := &BackoffTimer{backoffs: backoffs}
if len(backoffs) == 0 {
boff.backoffs = defaultBackoffs
} else {
sort.Slice(backoffs, func(i, j int) bool {
return backoffs[i] < backoffs[j]
})
}
return boff
}
// IncreaseInterval bumps the duration of the interval up to the next given value
func (b *BackoffTimer) IncreaseInterval() {
b.lastInterval = time.Now()
if b.backoffLevel < len(b.backoffs) {
b.backoffLevel += 1
}
}
// IntervalElapsed returns if the current interval has elapsed
func (b *BackoffTimer) IntervalElapsed() bool {
return time.Since(b.lastInterval) > b.calculateInterval()
}
// Reset returns BackoffTimer to its original empty state
func (b *BackoffTimer) Reset() {
b.lastInterval = time.Time{}
b.backoffLevel = 0
}
func (b *BackoffTimer) calculateInterval() time.Duration {
if b.backoffLevel >= len(b.backoffs) {
return b.backoffs[len(b.backoffs)-1]
}
interval := b.backoffs[b.backoffLevel]
return interval
}
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