package job import ( "time" "github.com/cenk/backoff" ) var ( _ backoff.BackOff = (*BackOff)(nil) ) const ( defaultMinJobInterval = 30 * time.Second ) // BackOff is an exponential backoff implementation for long running jobs. // In long running jobs, an operation() that fails after a long Duration should not increments the backoff period. // If operation() takes more than MinJobInterval, Reset() is called in NextBackOff(). type BackOff struct { *backoff.ExponentialBackOff MinJobInterval time.Duration } // NewBackOff creates an instance of BackOff using default values. func NewBackOff(backOff *backoff.ExponentialBackOff) *BackOff { backOff.MaxElapsedTime = 0 return &BackOff{ ExponentialBackOff: backOff, MinJobInterval: defaultMinJobInterval, } } // NextBackOff calculates the next backoff interval. func (b *BackOff) NextBackOff() time.Duration { if b.GetElapsedTime() >= b.MinJobInterval { b.Reset() } return b.ExponentialBackOff.NextBackOff() }