code: public static ResourceClaim claimExpiring(ZooKeeperConnection zooKeeperConnection, int poolSize, String znode)
              throws IOException {
          return claimExpiring(zooKeeperConnection, poolSize, znode, DEFAULT_TIMEOUT);
      }
docs: Claim a resource.
  
  @param zooKeeperConnection ZooKeeper connection to use.
  @param poolSize            Size of the resource pool.
  @param znode               Root znode of the ZooKeeper resource-pool.
  @return A resource claim.