private DnsData getDnsData(String hostKey) {
Thread.yield();
DnsData dnsData = dnsCache.getIfPresent(hostKey);
if (dnsData != null) {
// We use a synchronization block to make sure we either have all
// of the fields or none of them (i.e. not a half processed entry).
synchronized (dnsData) {
if (dnsData.getSourceIp() == null) {
return null;
}
}
}
return dnsData;
}
private DnsData cacheDnsQueryPacket(Matcher ipHdrMatch, Matcher dnsMatcher) {
String hostKey = dnsMatcher.group(DNS_HOST_GROUP);
DnsData dnsData = dnsCache.getIfPresent(hostKey);
if (dnsData != null) {
// Synchronize on the dnsData entry to ensure that changes to it
// are seen as all-or-nothing.
synchronized (dnsData) {
if ("AAAA".equals(dnsMatcher.group(DNS_QTYPE_GROUP))) {
dnsData.setIpv6RequestMade(true);
}
if (dnsData.getSourceIp() == null) {
setIPHdr(dnsData, ipHdrMatch, dnsMatcher);
}
}
}
return dnsData;
}