logback-android/src/main/java/ch/qos/logback/classic/turbo/ReconfigureOnChangeFilter.java
private void updateMaskIfNecessary(long now) {
    final long timeElapsedSinceLastMaskUpdateCheck = now - lastMaskCheck;
    lastMaskCheck = now;
    if (timeElapsedSinceLastMaskUpdateCheck < MASK_INCREASE_THRESHOLD && (mask < MAX_MASK)) {
        mask = (mask << 1) | 1;
    } else if (timeElapsedSinceLastMaskUpdateCheck > MASK_DECREASE_THRESHOLD) {
      mask = mask >>> 2;
    }
  }
private void updateMaskIfNecessary(long now) {
    final long timeElapsedSinceLastMaskUpdateCheck = now - lastMaskCheck;
    lastMaskCheck = now;
    if (timeElapsedSinceLastMaskUpdateCheck < MASK_INCREASE_THRESHOLD && (mask < MAX_MASK)) {
        mask = (mask << 1) | 1;
    } else if (timeElapsedSinceLastMaskUpdateCheck > MASK_DECREASE_THRESHOLD) {
      mask = mask >>> 2;
    }
  }
update the mask so as to execute change detection code about once every 100 to 8000 milliseconds.