| Interface | Description | 
|---|---|
| BackOff | Provide a  BackOffExecutionthat indicates the rate at which
 an operation should be retried. | 
| BackOffExecution | Represent a particular back-off execution. | 
| Class | Description | 
|---|---|
| ExponentialBackOff | Implementation of  BackOffthat increases the back off period for each
 retry attempt. | 
| FixedBackOff | A simple  BackOffimplementation that provides a fixed interval
 between two attempts and a maximum number of retries. |