LoggingDnsQueryLifecycleObserver Class — netty Architecture

Source Code

resolver-dns/src/main/java/io/netty/resolver/dns/LoggingDnsQueryLifecycleObserver.java lines 29–87

final class LoggingDnsQueryLifecycleObserver implements DnsQueryLifecycleObserver {
    private final InternalLogger logger;
    private final InternalLogLevel level;
    private final DnsQuestion question;
    private InetSocketAddress dnsServerAddress;

    LoggingDnsQueryLifecycleObserver(DnsQuestion question, InternalLogger logger, InternalLogLevel level) {
        this.question = checkNotNull(question, "question");
        this.logger = checkNotNull(logger, "logger");
        this.level = checkNotNull(level, "level");
    }

    @Override
    public void queryWritten(InetSocketAddress dnsServerAddress, ChannelFuture future) {
        this.dnsServerAddress = dnsServerAddress;
    }

    @Override
    public void queryCancelled(int queriesRemaining) {
        if (dnsServerAddress != null) {
            logger.log(level, "from {} : {} cancelled with {} queries remaining", dnsServerAddress, question,
                        queriesRemaining);
        } else {
            logger.log(level, "{} query never written and cancelled with {} queries remaining", question,
                        queriesRemaining);
        }
    }

    @Override
    public DnsQueryLifecycleObserver queryRedirected(List<InetSocketAddress> nameServers) {
        logger.log(level, "from {} : {} redirected", dnsServerAddress, question);
        return this;
    }

    @Override
    public DnsQueryLifecycleObserver queryCNAMEd(DnsQuestion cnameQuestion) {
        logger.log(level, "from {} : {} CNAME question {}", dnsServerAddress, question, cnameQuestion);
        return this;
    }

    @Override
    public DnsQueryLifecycleObserver queryNoAnswer(DnsResponseCode code) {
        logger.log(level, "from {} : {} no answer {}", dnsServerAddress, question, code);
        return this;
    }

    @Override
    public void queryFailed(Throwable cause) {
        if (dnsServerAddress != null) {
            logger.log(level, "from {} : {} failure", dnsServerAddress, question, cause);
        } else {
            logger.log(level, "{} query never written and failed", question, cause);
        }
    }

    @Override
    public void querySucceed() {
    }
}