@Override
  public long nextBackoff(int attempts, Throwable error) {
    return Math.round(Math.pow(1.6, attempts - 1) * _backoff);
  }
@Override
  public long nextBackoff(int attempts, Throwable error) {
    return Math.round(Math.pow(1.6, attempts - 1) * _backoff);
  }
@ Override public long nextBackoff ( int attempts , Throwable error ) { return Math . round ( Math . pow ( 1.6 , attempts - 1 ) * _backoff ) ; }
{@inheritDoc}
{