How to use

generateRandomKey

method

in

net.i2p.kademlia.KBucketSet

/**
 *  For every bucket that hasn't been updated in this long,
 *  or isn't close to full,
 *  generate a random key that would be a member of that bucket.
 *  The returned keys may be searched for to "refresh" the buckets.
 *  @return non-null, closest first
 */
public List<T> getExploreKeys(long age) {
  List<T> rv = new ArrayList<T>(_buckets.size());
  long old = _context.clock().now() - age;
  getReadLock();
  try {
    for (KBucket<T> b : _buckets) {
      int curSize = b.getKeyCount();
      // Always explore the closest bucket
      if ((b.getRangeBegin() == 0) ||
        (b.getLastChanged() < old || curSize < BUCKET_SIZE * 3 / 4))
        rv.add(generateRandomKey(b));
    }
  } finally { releaseReadLock(); }
  return rv;
}

/** @since 0.9.10 */
public void testGenRandom() {
  int errors = 0;
  for (KBucket<Hash> b : set.getBuckets()) {
    for (int j = 0; j < 4000; j++) {
      Hash rand = set.generateRandomKey(b);
      int range = set.getRange(rand);
      if (range < b.getRangeBegin() || range > b.getRangeEnd()) {
        log.error("Generate random key failed range=" + range + " for " + rand + " meant for bucket " + b);
        errors++;
      }
    }
  }
  assertTrue(errors == 0);
}