if( CACHE_POLICY == 0 ) {
            return;
        }
        long expiration = -1;
        if( CACHE_POLICY != FOREVER ) {
            expiration = System.currentTimeMillis() + CACHE_POLICY * 1000;
        }
        cacheAddress( hostName, addr, expiration );
    }
    static void cacheAddress( Name hostName, NbtAddress addr, long expiration ) {
        if( CACHE_POLICY == 0 ) {
            return;