Example usage for io.netty.handler.codec.dns DnsRecord CLASS_IN

Introduction

In this page you can find the example usage for io.netty.handler.codec.dns DnsRecord CLASS_IN.

Prototype

int CLASS_IN

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Document

DNS resource record class: IN

Usage

From source file:io.vertx.core.dns.impl.DnsClientImpl.java

License:Open Source License

@SuppressWarnings("unchecked")
private <T> void lookup(String name, Future<List<T>> result, DnsRecordType... types) {
    Objects.requireNonNull(name, "no null name accepted");
    bootstrap.connect(dnsServer).addListener(new RetryChannelFutureListener(result) {
        @Override//from   ww  w .  j  ava2  s.co  m
        public void onSuccess(ChannelFuture future) throws Exception {
            DatagramDnsQuery query = new DatagramDnsQuery(null, dnsServer,
                    ThreadLocalRandom.current().nextInt());
            for (DnsRecordType type : types) {
                query.addRecord(DnsSection.QUESTION, new DefaultDnsQuestion(name, type, DnsRecord.CLASS_IN));
            }
            future.channel().writeAndFlush(query).addListener(new RetryChannelFutureListener(result) {
                @Override
                public void onSuccess(ChannelFuture future) throws Exception {
                    future.channel().pipeline().addLast(new SimpleChannelInboundHandler<DnsResponse>() {
                        @Override
                        protected void channelRead0(ChannelHandlerContext ctx, DnsResponse msg)
                                throws Exception {
                            DnsResponseCode code = DnsResponseCode.valueOf(msg.code().intValue());

                            if (code == DnsResponseCode.NOERROR) {

                                int count = msg.count(DnsSection.ANSWER);

                                List<T> records = new ArrayList<>(count);
                                for (int idx = 0; idx < count; idx++) {
                                    DnsRecord a = msg.recordAt(DnsSection.ANSWER, idx);
                                    T record = RecordDecoder.decode(a);
                                    if (isRequestedType(a.type(), types)) {
                                        records.add(record);
                                    }
                                }

                                if (records.size() > 0 && (records.get(0) instanceof MxRecordImpl
                                        || records.get(0) instanceof SrvRecordImpl)) {
                                    Collections.sort((List) records);
                                }

                                setResult(result, records);
                            } else {
                                setFailure(result, new DnsException(code));
                            }
                            ctx.close();
                        }

                        private boolean isRequestedType(DnsRecordType dnsRecordType, DnsRecordType[] types) {
                            for (DnsRecordType t : types) {
                                if (t.equals(dnsRecordType)) {
                                    return true;
                                }
                            }
                            return false;
                        }

                        @Override
                        public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause)
                                throws Exception {
                            setFailure(result, cause);
                            ctx.close();
                        }
                    });
                }
            });
        }
    });
}

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