code: public long delayBeforeNextRetry(int retriesAttempted) {
          if (retriesAttempted < 1) {
              return initialDelay;
          }
  
  
          if (retriesAttempted > 63) {
              return maxDelay;
          }
  
          long multiplier = ((long)1 << (retriesAttempted - 1));
          if (multiplier > Long.MAX_VALUE / delayInterval) {
              return maxDelay;
          }
  
          long delay = multiplier * delayInterval;
          delay = Math.min(delay, maxDelay);
          return delay;
      }
docs: Returns the delay before the next attempt.
  
  @param retriesAttempted
  @return The delay before the next attempt.