BackOff is a backoff policy for retrying an operation.

ConstantBackOff is a backoff policy that always returns the same backoff delay. This is in contrast to an exponential backoff policy, which returns a

* ExponentialBackOff is a backoff implementation that increases the backoff period for each retry attempt using a randomization function that grows ex

Notify is called after a failed attempt that will be retried, with the operation error and the backoff duration before the next attempt. It is called

Operation is the function Retry calls. It is invoked at least once and may be retried on error. Return a Permanent error to stop retrying immediately,

RetryAfterError signals that the operation should be retried after the given duration. When an operation returns one (directly or wrapped), Retry wait

RetryError is the error returned by Retry for every failure. It records the last error returned by the operation (LastErr) together with the reason re

RetryOption configures the behavior of Retry.

StopBackOff is a fixed backoff policy that always returns backoff.Stop for NextBackOff(), meaning that the operation should never be retried.

Ticker holds a channel that delivers `ticks' of a clock at times reported by a BackOff. Ticks will continue to arrive when the previous operation is

ZeroBackOff is a fixed backoff policy whose backoff time is always zero, meaning that the operation is retried immediately without waiting, indefinite

countingBackOff records how many times it is reset and queried.

defaultTimer implements Timer interface using time.Timer

permanent marks an operation error as non-retriable. It is an internal transport produced by Permanent and consumed by Retry, which converts it into a

retryOptions holds configuration settings for the retry mechanism.

spyTimer records the durations it is asked to wait, then fires immediately.