public RetryPolicyBuilder backoffStrategy(BackoffStrategy backoffStrategy) {
        this.backoffStrategy = backoffStrategy;
        return this;
    }
Note, this option and {@link #fixedBackoff(int)} are mutually exclusive settings.

<p>If backoff strategy is not provided, {@link PredefinedRetryPolicies#DEFAULT_BACKOFF_STRATEGY} will be used.</p>

<p>See {@link com.amazonaws.retry.PredefinedBackoffStrategies} for precanned implementations.</p>

@param backoffStrategy Backoff strategy to use in the RetryPolicy.
@return This object for method chaining.
aws-java-sdk-opensdk/src/main/java/com/amazonaws/opensdk/retry/RetryPolicyBuilder.java