code: public boolean expire(final String identifier, final String... attributes){
      return this.expire(identifier, System.currentTimeMillis(),attributes);
    }
docs: Expires an Identifier, or one or more attributes of that Identifier. If
  Attributes are specified, then they will be expired instead of the
  Identifier.  The expiration time will be the current local time.
  @param identifier
  the Identifier to expire, or the Identifier of the attributes to
  expire.
  @param attributes
  one or more attribute names to expire. If none are specified, then
  the Identifier itself is expired.
  @return {@code true} if all expirations are successful, else {@code false}