Examples with ExtendedResolver org.xbill.DNS.ExtendedResolver used on opensource projects

Example 16 with ExtendedResolver

use of org.xbill.DNS.ExtendedResolver in project jmeter by apache.

the class DNSCacheManager method requestLookup.

/**
     * Sends DNS request via system or custom DNS resolver
     * @param host Host
     * @return array of {@link InetAddress} or null if lookup did not return result
     */
private InetAddress[] requestLookup(String host) throws UnknownHostException {
    InetAddress[] addresses = null;
    if (isCustomResolver()) {
        ExtendedResolver extendedResolver = getResolver();
        if (extendedResolver != null) {
            if (extendedResolver.getResolvers().length > 0) {
                try {
                    Lookup lookup = new Lookup(host, Type.A);
                    lookup.setCache(lookupCache);
                    if (timeoutMs > 0) {
                        resolver.setTimeout(timeoutMs / 1000, timeoutMs % 1000);
                    }
                    lookup.setResolver(resolver);
                    Record[] records = lookup.run();
                    if (records == null || records.length == 0) {
                        throw new UnknownHostException("Failed to resolve host name: " + host);
                    }
                    addresses = new InetAddress[records.length];
                    for (int i = 0; i < records.length; i++) {
                        addresses[i] = ((ARecord) records[i]).getAddress();
                    }
                } catch (TextParseException tpe) {
                    log.debug("Failed to create Lookup object: " + tpe);
                }
                return addresses;
            }
        } else {
            throw new UnknownHostException("Could not resolve host:" + host + ", failed to initialize resolver" + " or no resolver found");
        }
    }
    addresses = systemDefaultDnsResolver.resolve(host);
    if (log.isDebugEnabled()) {
        log.debug("Cache miss: {} Thread #{}, resolved with system resolver into {}", host, JMeterContextService.getContext().getThreadNum(), Arrays.toString(addresses));
    }
    return addresses;
}