apollo-core/src/main/java/com/ctrip/framework/apollo/core/schedule/ExponentialSchedulePolicy.java/ExponentialSchedulePolicy/ExponentialSchedulePolicy
class ExponentialSchedulePolicy:  public ExponentialSchedulePolicy(long delayTimeLowerBound, long delayTimeUpperBound) {
    this.delayTimeLowerBound = delayTimeLowerBound;
    this.delayTimeUpperBound = delayTimeUpperBound;
  }